linelog: add a Python implementation of the linelog datastructure

This datastructure was originally developed by Jun Wu at Facebook,
inspired by SCCS weaves. It's useful as a cache for blame information,
but also is the magic that makes `hg absorb` easy to implement. In
service of importing the code to Mercurial, I wanted to actually
/understand/ it, and once I did I decided to take a run at
implementing it.

The help/internals/linelog.txt document is the README from Jun Wu's
implementaiton. It all applies to our linelog implementation.

Differential Revision: https://phab.mercurial-scm.org/D3990

.arcconfig

@@ -0,0 +1,6 b''
+{
+    "conduit_uri": "https://phab.mercurial-scm.org/api",
+    "repository.callsign": "HG",
+    "arc.land.onto.default": "@",
+    "base": "hg:.^"
+}

.clang-format

@@ -0,0 +1,13 b''
+BasedOnStyle: LLVM
+IndentWidth: 8
+UseTab: ForIndentation
+BreakBeforeBraces: Linux
+AllowShortIfStatementsOnASingleLine: false
+IndentCaseLabels: false
+AllowShortBlocksOnASingleLine: false
+AllowShortFunctionsOnASingleLine: false
+IncludeCategories:
+  - Regex:           '^<'
+    Priority:        1
+  - Regex:           '^"'
+    Priority:        2

.editorconfig

@@ -0,0 +1,18 b''
+# See http://EditorConfig.org for the specification
+
+root = true
+
+[*.py]
+indent_size = 4
+indent_style = space
+trim_trailing_whitespace = true
+
+[*.{c,h}]
+indent_size = 8
+indent_style = tab
+trim_trailing_whitespace = true
+
+[*.t]
+indent_size = 2
+indent_style = space
+trim_trailing_whitespace = false

.hgignore

@@ -0,0 +1,68 b''
+syntax: glob
+
+*.elc
+*.tmp
+*.orig
+*.rej
+*~
+*.mergebackup
+*.o
+*.so
+*.dll
+*.exe
+*.pyd
+*.pyc
+*.pyo
+*$py.class
+*.swp
+*.prof
+*.zip
+\#*\#
+.\#*
+tests/.coverage*
+tests/.testtimes*
+tests/.hypothesis
+tests/hypothesis-generated
+tests/annotated
+tests/exceptions
+tests/*.err
+tests/htmlcov
+build
+contrib/chg/chg
+contrib/hgsh/hgsh
+contrib/vagrant/.vagrant
+dist
+packages
+doc/common.txt
+doc/*.[0-9]
+doc/*.[0-9].txt
+doc/*.[0-9].gendoc.txt
+doc/*.[0-9].{x,ht}ml
+MANIFEST
+MANIFEST.in
+patches
+mercurial/__modulepolicy__.py
+mercurial/__version__.py
+mercurial/hgpythonlib.h
+mercurial.egg-info
+.DS_Store
+tags
+cscope.*
+.idea/*
+.asv/*
+i18n/hg.pot
+locale/*/LC_MESSAGES/hg.mo
+hgext/__index__.py
+
+rust/target/
+
+# Generated wheels
+wheelhouse/
+
+syntax: regexp
+^\.pc/
+^\.(pydev)?project
+
+# hackable windows distribution additions
+^hg-python
+^hg.py$

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+77eaf9539499a1b8be259ffe7ada787d07857f80 4.1.3
+616e788321cc4ae9975b7f0c54c849f36d82182b 4.2-rc
+bb96d4a497432722623ae60d9bc734a1e360179e 4.2
+c850f0ed54c1d42f9aa079ad528f8127e5775217 4.2.1
+26c49ed51a698ec016d2b4c6b44ca3c3f73cc788 4.2.2
+857876ebaed4e315f63157bd157d6ce553c7ab73 4.3-rc
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+943c91326b23954e6e1c6960d0239511f9530258 4.2.3
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+cabc840ffdee8a72f3689fb77dd74d04fdc2bc04 4.4.1
+a92b9f8e11ba330614cdfd6af0e03b15c1ff3797 4.4.2
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+ed5448edcbfa747b9154099e18630e49024fd47b 4.6rc0
+1ec874717d8a93b19e0d50628443e0ee5efab3a9 4.6rc1
+6614cac550aea66d19c601e45efd1b7bd08d7c40 4.6
+9c5ced5276d6e7d54f7c3dadf5247b7ee98ec79c 4.6.1
+0b63a6743010dfdbf8a8154186e119949bdaa1cc 4.6.2
+e90130af47ce8dd53a3109aed9d15876b3e7dee8 4.7rc0
+33ac6a72308a215e6086fbced347ec10aa963b0a 4.7

.jshintrc

@@ -0,0 +1,11 b''
+{
+    // Enforcing
+    "eqeqeq"        : true,     // true: Require triple equals (===) for comparison
+    "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()
+    "freeze"        : true,     // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
+    "nonbsp"        : true,     // true: Prohibit "non-breaking whitespace" characters.
+    "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)
+
+    // Environments
+    "browser"       : true      // Web Browser (window, document, etc)
+}

CONTRIBUTING

@@ -0,0 +1,13 b''
+Our full contribution guidelines are in our wiki, please see:
+
+https://www.mercurial-scm.org/wiki/ContributingChanges
+
+If you just want a checklist to follow, you can go straight to
+
+https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
+
+If you can't run the entire testsuite for some reason (it can be
+difficult on Windows), please at least run `contrib/check-code.py` on
+any files you've modified and run `python contrib/check-commit` on any
+commits you've made (for example, `python contrib/check-commit
+273ce12ad8f1` will report some style violations on a very old commit).

CONTRIBUTORS

@@ -0,0 +1,41 b''
+[This file is here for historical purposes, all recent contributors
+should appear in the changelog directly]
+
+Andrea Arcangeli <andrea at suse.de>
+Thomas Arendsen Hein <thomas at intevation.de>
+Goffredo Baroncelli <kreijack at libero.it>
+Muli Ben-Yehuda <mulix at mulix.org>
+Mikael Berthe <mikael at lilotux.net>
+Benoit Boissinot <bboissin at gmail.com>
+Brendan Cully <brendan at kublai.com>
+Vincent Danjean <vdanjean.ml at free.fr>
+Jake Edge <jake at edge2.net>
+Michael Fetterman <michael.fetterman at intel.com>
+Edouard Gomez <ed.gomez at free.fr>
+Eric Hopper <hopper at omnifarious.org>
+Alecs King <alecsk at gmail.com>
+Volker Kleinfeld <Volker.Kleinfeld at gmx.de>
+Vadim Lebedev <vadim at mbdsys.com>
+Christopher Li <hg at chrisli.org>
+Chris Mason <mason at suse.com>
+Colin McMillen <mcmillen at cs.cmu.edu>
+Wojciech Milkowski <wmilkowski at interia.pl>
+Chad Netzer <chad.netzer at gmail.com>
+Bryan O'Sullivan <bos at serpentine.com>
+Vicent Seguí Pascual <vseguip at gmail.com>
+Sean Perry <shaleh at speakeasy.net>
+Nguyen Anh Quynh <aquynh at gmail.com>
+Ollivier Robert <roberto at keltia.freenix.fr>
+Alexander Schremmer <alex at alexanderweb.de>
+Arun Sharma <arun at sharma-home.net>
+Josef "Jeff" Sipek <jeffpc at optonline.net>
+Kevin Smith <yarcs at qualitycode.com>
+TK Soh <teekaysoh at yahoo.com>
+Radoslaw Szkodzinski <astralstorm at gorzow.mm.pl>
+Samuel Tardieu <sam at rfc1149.net>
+K Thananchayan <thananck at yahoo.com>
+Andrew Thompson <andrewkt at aktzero.com>
+Michael S. Tsirkin <mst at mellanox.co.il>
+Rafael Villar Burke <pachi at mmn-arquitectos.com>
+Tristan Wibberley <tristan at wibberley.org>
+Mark Williamson <mark.williamson at cl.cam.ac.uk>

COPYING

@@ -0,0 +1,339 b''
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
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+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
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+you have.  You must make sure that they, too, receive or can get the
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+
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+
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+that everyone understands that there is no warranty for this free
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+
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
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+a notice placed by the copyright holder saying it may be distributed
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+Activities other than copying, distribution and modification are not
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+
+You may charge a fee for the physical act of transferring a copy, and
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+
+  2. You may modify your copy or copies of the Program or any portion
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+
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+
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+These requirements apply to the modified work as a whole.  If
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+Thus, it is not the intent of this section to claim rights or contest
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+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
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+
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+  4. You may not copy, modify, sublicense, or distribute the Program
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+  7. If, as a consequence of a court judgment or allegation of patent
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+may not distribute the Program at all.  For example, if a patent
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+
+If any portion of this section is held invalid or unenforceable under
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+
+This section is intended to make thoroughly clear what is believed to
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+  8. If the distribution and/or use of the Program is restricted in
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+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

Makefile

@@ -0,0 +1,243 b''
+# If you want to change PREFIX, do not just edit it below. The changed
+# value wont get passed on to recursive make calls. You should instead
+# override the variable on the command like:
+#
+# % make PREFIX=/opt/ install
+
+export PREFIX=/usr/local
+PYTHON=python
+$(eval HGROOT := $(shell pwd))
+HGPYTHONS ?= $(HGROOT)/build/pythons
+PURE=
+PYFILES:=$(shell find mercurial hgext doc -name '*.py')
+DOCFILES=mercurial/help/*.txt
+export LANGUAGE=C
+export LC_ALL=C
+TESTFLAGS ?= $(shell echo $$HGTESTFLAGS)
+OSXVERSIONFLAGS ?= $(shell echo $$OSXVERSIONFLAGS)
+
+# Set this to e.g. "mingw32" to use a non-default compiler.
+COMPILER=
+
+COMPILERFLAG_tmp_ =
+COMPILERFLAG_tmp_${COMPILER} ?= -c $(COMPILER)
+COMPILERFLAG=${COMPILERFLAG_tmp_${COMPILER}}
+
+help:
+	@echo 'Commonly used make targets:'
+	@echo '  all          - build program and documentation'
+	@echo '  install      - install program and man pages to $$PREFIX ($(PREFIX))'
+	@echo '  install-home - install with setup.py install --home=$$HOME ($(HOME))'
+	@echo '  local        - build for inplace usage'
+	@echo '  tests        - run all tests in the automatic test suite'
+	@echo '  test-foo     - run only specified tests (e.g. test-merge1.t)'
+	@echo '  dist         - run all tests and create a source tarball in dist/'
+	@echo '  clean        - remove files created by other targets'
+	@echo '                 (except installed files or dist source tarball)'
+	@echo '  update-pot   - update i18n/hg.pot'
+	@echo
+	@echo 'Example for a system-wide installation under /usr/local:'
+	@echo '  make all && su -c "make install" && hg version'
+	@echo
+	@echo 'Example for a local installation (usable in this directory):'
+	@echo '  make local && ./hg version'
+
+all: build doc
+
+local:
+	$(PYTHON) setup.py $(PURE) \
+	  build_py -c -d . \
+	  build_ext $(COMPILERFLAG) -i \
+	  build_hgexe $(COMPILERFLAG) -i \
+	  build_mo
+	env HGRCPATH= $(PYTHON) hg version
+
+build:
+	$(PYTHON) setup.py $(PURE) build $(COMPILERFLAG)
+
+wheel:
+	FORCE_SETUPTOOLS=1 $(PYTHON) setup.py $(PURE) bdist_wheel $(COMPILERFLAG)
+
+doc:
+	$(MAKE) -C doc
+
+cleanbutpackages:
+	-$(PYTHON) setup.py clean --all # ignore errors from this command
+	find contrib doc hgext hgext3rd i18n mercurial tests hgdemandimport \
+		\( -name '*.py[cdo]' -o -name '*.so' \) -exec rm -f '{}' ';'
+	rm -f MANIFEST MANIFEST.in hgext/__index__.py tests/*.err
+	rm -f mercurial/__modulepolicy__.py
+	if test -d .hg; then rm -f mercurial/__version__.py; fi
+	rm -rf build mercurial/locale
+	$(MAKE) -C doc clean
+	$(MAKE) -C contrib/chg distclean
+
+clean: cleanbutpackages
+	rm -rf packages
+
+install: install-bin install-doc
+
+install-bin: build
+	$(PYTHON) setup.py $(PURE) install --root="$(DESTDIR)/" --prefix="$(PREFIX)" --force
+
+install-doc: doc
+	cd doc && $(MAKE) $(MFLAGS) install
+
+install-home: install-home-bin install-home-doc
+
+install-home-bin: build
+	$(PYTHON) setup.py $(PURE) install --home="$(HOME)" --prefix="" --force
+
+install-home-doc: doc
+	cd doc && $(MAKE) $(MFLAGS) PREFIX="$(HOME)" install
+
+MANIFEST-doc:
+	$(MAKE) -C doc MANIFEST
+
+MANIFEST.in: MANIFEST-doc
+	hg manifest | sed -e 's/^/include /' > MANIFEST.in
+	echo include mercurial/__version__.py >> MANIFEST.in
+	sed -e 's/^/include /' < doc/MANIFEST >> MANIFEST.in
+
+dist:	tests dist-notests
+
+dist-notests:	doc MANIFEST.in
+	TAR_OPTIONS="--owner=root --group=root --mode=u+w,go-w,a+rX-s" $(PYTHON) setup.py -q sdist
+
+check: tests
+
+tests:
+	cd tests && $(PYTHON) run-tests.py $(TESTFLAGS)
+
+test-%:
+	cd tests && $(PYTHON) run-tests.py $(TESTFLAGS) $@
+
+testpy-%:
+	@echo Looking for Python $* in $(HGPYTHONS)
+	[ -e $(HGPYTHONS)/$*/bin/python ] || ( \
+	cd $$(mktemp --directory --tmpdir) && \
+        $(MAKE) -f $(HGROOT)/contrib/Makefile.python PYTHONVER=$* PREFIX=$(HGPYTHONS)/$* python )
+	cd tests && $(HGPYTHONS)/$*/bin/python run-tests.py $(TESTFLAGS)
+
+check-code:
+	hg manifest | xargs python contrib/check-code.py
+
+format-c:
+	clang-format --style file -i \
+	  `hg files 'set:(**.c or **.cc or **.h) and not "listfile:contrib/clang-format-ignorelist"'`
+
+update-pot: i18n/hg.pot
+
+i18n/hg.pot: $(PYFILES) $(DOCFILES) i18n/posplit i18n/hggettext
+	$(PYTHON) i18n/hggettext mercurial/commands.py \
+	  hgext/*.py hgext/*/__init__.py \
+	  mercurial/fileset.py mercurial/revset.py \
+	  mercurial/templatefilters.py \
+	  mercurial/templatefuncs.py \
+	  mercurial/templatekw.py \
+	  mercurial/filemerge.py \
+	  mercurial/hgweb/webcommands.py \
+	  mercurial/util.py \
+	  $(DOCFILES) > i18n/hg.pot.tmp
+        # All strings marked for translation in Mercurial contain
+        # ASCII characters only. But some files contain string
+        # literals like this '\037\213'. xgettext thinks it has to
+        # parse them even though they are not marked for translation.
+        # Extracting with an explicit encoding of ISO-8859-1 will make
+        # xgettext "parse" and ignore them.
+	echo $(PYFILES) | xargs \
+	  xgettext --package-name "Mercurial" \
+	  --msgid-bugs-address "<[e-mail]>" \
+	  --copyright-holder "Matt Mackall <[e-mail]> and others" \
+	  --from-code ISO-8859-1 --join --sort-by-file --add-comments=i18n: \
+	  -d hg -p i18n -o hg.pot.tmp
+	$(PYTHON) i18n/posplit i18n/hg.pot.tmp
+        # The target file is not created before the last step. So it never is in
+        # an intermediate state.
+	mv -f i18n/hg.pot.tmp i18n/hg.pot
+
+%.po: i18n/hg.pot
+        # work on a temporary copy for never having a half completed target
+	cp $@ $@.tmp
+	msgmerge --no-location --update $@.tmp $^
+	mv -f $@.tmp $@
+
+# Packaging targets
+
+packaging_targets := \
+  centos5 \
+  centos6 \
+  centos7 \
+  deb \
+  docker-centos5 \
+  docker-centos6 \
+  docker-centos7 \
+  docker-debian-jessie \
+  docker-debian-stretch \
+  docker-fedora20 \
+  docker-fedora21 \
+  docker-fedora28 \
+  docker-ubuntu-trusty \
+  docker-ubuntu-trusty-ppa \
+  docker-ubuntu-xenial \
+  docker-ubuntu-xenial-ppa \
+  docker-ubuntu-artful \
+  docker-ubuntu-artful-ppa \
+  docker-ubuntu-bionic \
+  docker-ubuntu-bionic-ppa \
+  fedora20 \
+  fedora21 \
+  fedora28 \
+  linux-wheels \
+  linux-wheels-x86_64 \
+  linux-wheels-i686 \
+  ppa
+
+# Forward packaging targets for convenience.
+$(packaging_targets):
+	$(MAKE) -C contrib/packaging $@
+
+osx:
+	rm -rf build/mercurial
+	/usr/bin/python2.7 setup.py install --optimize=1 \
+	  --root=build/mercurial/ --prefix=/usr/local/ \
+	  --install-lib=/Library/Python/2.7/site-packages/
+	make -C doc all install DESTDIR="$(PWD)/build/mercurial/"
+        # Place a bogon .DS_Store file in the target dir so we can be
+        # sure it doesn't get included in the final package.
+	touch build/mercurial/.DS_Store
+        # install zsh completions - this location appears to be
+        # searched by default as of macOS Sierra.
+	install -d build/mercurial/usr/local/share/zsh/site-functions/
+	install -m 0644 contrib/zsh_completion build/mercurial/usr/local/share/zsh/site-functions/_hg
+        # install bash completions - there doesn't appear to be a
+        # place that's searched by default for bash, so we'll follow
+        # the lead of Apple's git install and just put it in a
+        # location of our own.
+	install -d build/mercurial/usr/local/hg/contrib/
+	install -m 0644 contrib/bash_completion build/mercurial/usr/local/hg/contrib/hg-completion.bash
+	make -C contrib/chg \
+	  HGPATH=/usr/local/bin/hg \
+	  PYTHON=/usr/bin/python2.7 \
+	  HGEXTDIR=/Library/Python/2.7/site-packages/hgext \
+	  DESTDIR=../../build/mercurial \
+	  PREFIX=/usr/local \
+	  clean install
+	mkdir -p $${OUTPUTDIR:-dist}
+	HGVER=$$(python contrib/genosxversion.py $(OSXVERSIONFLAGS) build/mercurial/Library/Python/2.7/site-packages/mercurial/__version__.py) && \
+	OSXVER=$$(sw_vers -productVersion | cut -d. -f1,2) && \
+	pkgbuild --filter \\.DS_Store --root build/mercurial/ \
+	  --identifier org.mercurial-scm.mercurial \
+	  --version "$${HGVER}" \
+	  build/mercurial.pkg && \
+	productbuild --distribution contrib/packaging/macosx/distribution.xml \
+	  --package-path build/ \
+	  --version "$${HGVER}" \
+	  --resources contrib/packaging/macosx/ \
+	  "$${OUTPUTDIR:-dist/}"/Mercurial-"$${HGVER}"-macosx"$${OSXVER}".pkg
+
+.PHONY: help all local build doc cleanbutpackages clean install install-bin \
+	install-doc install-home install-home-bin install-home-doc \
+	dist dist-notests check tests check-code format-c update-pot \
+	$(packaging_targets) \
+	osx

README.rst

@@ -0,0 +1,20 b''
+Mercurial
+=========
+
+Mercurial is a fast, easy to use, distributed revision control tool
+for software developers.
+
+Basic install::
+
+ $ make            # see install targets
+ $ make install    # do a system-wide install
+ $ hg debuginstall # sanity-check setup
+ $ hg              # see help
+
+Running without installing::
+
+ $ make local      # build for inplace usage
+ $ ./hg --version  # should show the latest version
+
+See https://mercurial-scm.org/ for detailed installation
+instructions, platform-specific notes, and Mercurial user information.

contrib/Makefile.python

@@ -0,0 +1,76 b''
+PYTHONVER=2.7.14
+PYTHONNAME=python-
+PREFIX=$(HOME)/bin/prefix-$(PYTHONNAME)$(PYTHONVER)
+SYMLINKDIR=$(HOME)/bin
+
+help:
+	@echo
+	@echo 'Make a custom installation of a Python version'
+	@echo
+	@echo 'Common make parameters:'
+	@echo '  PYTHONVER=...    [$(PYTHONVER)]'
+	@echo '  PREFIX=...       [$(PREFIX)]'
+	@echo '  SYMLINKDIR=...   [$(SYMLINKDIR) creating $(PYTHONNAME)$(PYTHONVER)]'
+	@echo
+	@echo 'Common make targets:'
+	@echo '  python    - install Python $$PYTHONVER in $$PREFIX'
+	@echo '  symlink   - create a $$SYMLINKDIR/$(PYTHONNAME)$$PYTHONVER symlink'
+	@echo
+	@echo 'Example: create a temporary Python installation:'
+	@echo '  $$ make -f Makefile.python python PYTHONVER=${PYTHONVER} PREFIX=/tmp/p27'
+	@echo '  $$ /tmp/p27/bin/python -V'
+	@echo '  Python 2.7'
+	@echo
+	@echo 'Some external libraries are required for building Python: zlib bzip2 openssl.'
+	@echo 'Make sure their development packages are installed systemwide.'
+# fedora: yum install zlib-devel bzip2-devel openssl-devel
+# debian: apt-get install zlib1g-dev libbz2-dev libssl-dev
+	@echo
+	@echo 'To build a nice collection of interesting Python versions:'
+	@echo '  $$ for v in 2.{6{,.1,.2,.9},7{,.8,.10}}; do'
+	@echo '    make -f Makefile.python symlink PYTHONVER=$$v || break; done'
+	@echo 'To run a Mercurial test on all these Python versions:'
+	@echo '  $$ for py in `cd ~/bin && ls $(PYTHONNAME)2.*`; do'
+	@echo '    echo $$py; $$py run-tests.py test-http.t; echo; done'
+	@echo
+
+export LANGUAGE=C
+export LC_ALL=C
+
+python: $(PREFIX)/bin/python docutils
+	printf 'import sys, zlib, bz2, docutils, ssl' | $(PREFIX)/bin/python
+
+PYTHON_SRCDIR=Python-$(PYTHONVER)
+PYTHON_SRCFILE=$(PYTHON_SRCDIR).tgz
+
+$(PREFIX)/bin/python:
+	[ -f $(PYTHON_SRCFILE) ] || wget http://www.python.org/ftp/python/$(PYTHONVER)/$(PYTHON_SRCFILE) || curl -OL http://www.python.org/ftp/python/$(PYTHONVER)/$(PYTHON_SRCFILE) || [ -f $(PYTHON_SRCFILE) ]
+	rm -rf $(PYTHON_SRCDIR)
+	tar xf $(PYTHON_SRCFILE)
+	# Debian/Ubuntu disables SSLv2,3 the hard way, disable it on old Pythons too
+	-sed -i 's,self.*SSLv[23]_method(),0;//\0,g' $(PYTHON_SRCDIR)/Modules/_ssl.c
+	# Find multiarch system libraries on Ubuntu and disable fortify error when setting argv
+	LDFLAGS="-L/usr/lib/`dpkg-architecture -qDEB_HOST_MULTIARCH`"; \
+	BASECFLAGS=-U_FORTIFY_SOURCE; \
+	export LDFLAGS BASECFLAGS; \
+	cd $(PYTHON_SRCDIR) && ./configure --prefix=$(PREFIX) && make all SVNVERSION=pwd && make install
+	printf 'import sys, zlib, bz2, ssl' | $(PREFIX)/bin/python
+	rm -rf $(PYTHON_SRCDIR)
+
+DOCUTILSVER=0.12
+DOCUTILS_SRCDIR=docutils-$(DOCUTILSVER)
+DOCUTILS_SRCFILE=$(DOCUTILS_SRCDIR).tar.gz
+
+docutils: $(PREFIX)/bin/python
+	@$(PREFIX)/bin/python -c 'import docutils' || ( set -ex; \
+	[ -f $(DOCUTILS_SRCFILE) ] || wget http://downloads.sourceforge.net/project/docutils/docutils/$(DOCUTILSVER)/$(DOCUTILS_SRCFILE) || [ -f $(DOCUTILS_SRCFILE) ]; \
+	rm -rf $(DOCUTILS_SRCDIR); \
+	tar xf $(DOCUTILS_SRCFILE); \
+	cd $(DOCUTILS_SRCDIR) && $(PREFIX)/bin/python setup.py install --prefix=$(PREFIX); \
+	$(PREFIX)/bin/python -c 'import docutils'; \
+	rm -rf $(DOCUTILS_SRCDIR); )
+
+symlink: python $(SYMLINKDIR)
+	ln -sf $(PREFIX)/bin/python $(SYMLINKDIR)/$(PYTHONNAME)$(PYTHONVER)
+
+.PHONY: help python docutils symlink

contrib/all-revsets.txt

@@ -0,0 +1,141 b''
+# All revsets ever used with revsetbenchmarks.py script
+#
+# The goal of this file is to gather all revsets ever used for benchmarking
+# revset's performance. It should be used to gather revsets that test a
+# specific usecase or a specific implementation of revset predicates.
+# If you are working on the smartset implementation itself, check
+# 'base-revsets.txt'.
+#
+# Please update this file with any revsets you use for benchmarking a change so
+# that future contributors can easily find and retest it when doing further
+# modification. Feel free to highlight interesting variants if needed.
+
+
+## Revset from this section are all extracted from changelog when this file was
+# created. Feel free to dig and improve documentation.
+
+# Used in revision da05fe01170b
+(20000::) - (20000)
+# Used in revision 95af98616aa7
+parents(20000)
+# Used in revision 186fd06283b4
+(_intlist('20000\x0020001')) and merge()
+# Used in revision 911f5a6579d1
+p1(20000)
+p2(10000)
+# Used in revision b6dc3b79bb25
+0::
+# Used in revision faf4f63533ff
+bookmark()
+# Used in revision 22ba2c0825da
+tip~25
+# Used in revision 0cf46b8298fe
+bisect(range)
+# Used in revision 5b65429721d5
+divergent()
+# Used in revision 6261b9c549a2
+file(COPYING)
+# Used in revision 44f471102f3a
+follow(COPYING)
+# Used in revision 8040a44aab1c
+origin(tip)
+# Used in revision bbf4f3dfd700
+rev(25)
+# Used in revision a428db9ab61d
+p1()
+# Used in revision c1546d7400ef
+min(0::)
+# Used in revision 546fa6576815
+author(lmoscovicz) or author(mpm)
+author(mpm) or author(lmoscovicz)
+# Used in revision 9bfe68357c01
+public() and id("d82e2223f132")
+# Used in revision ba89f7b542c9
+rev(25)
+# Used in revision eb763217152a
+rev(210000)
+# Used in revision 69524a05a7fa
+10:100
+parents(10):parents(100)
+# Used in revision 6f1b8b3f12fd
+100~5
+parents(100)~5
+(100~5)~5
+# Used in revision 7a42e5d4c418
+children(tip~100)
+# Used in revision 7e8737e6ab08
+100^1
+parents(100)^1
+(100^1)^1
+# Used in revision 30e0dcd7c5ff
+matching(100)
+matching(parents(100))
+# Used in revision aafeaba22826
+0|1|2|3|4|5|6|7|8|9
+# Used in revision 33c7a94d4dd0
+tip:0
+# Used in revision 7d369fae098e
+(0:100000)
+# Used in revision b333ca94403d
+0 + 1 + 2 + ... + 200
+0 + 1 + 2 + ... + 1000
+sort(0 + 1 + 2 + ... + 200)
+sort(0 + 1 + 2 + ... + 1000)
+# Used in revision 7fbef7932af9
+first(0 + 1 + 2 + ... + 1000)
+# Used in revision ceaf04bb14ff
+0:1000
+# Used in revision 262e6ad93885
+not public()
+(tip~1000::) - public()
+not public() and branch("default")
+# Used in revision 15412bba5a68
+0::tip
+
+## all the revsets from this section have been taken from the former central file
+# for revset's benchmarking, they are undocumented for this reason.
+all()
+draft()
+::tip
+draft() and ::tip
+::tip and draft()
+author(lmoscovicz)
+author(mpm)
+::p1(p1(tip))::
+public()
+:10000 and public()
+:10000 and draft()
+(not public() - obsolete())
+
+# The one below is used by rebase
+(children(ancestor(tip~5, tip)) and ::(tip~5))::
+
+# those two `roots(...)` inputs are close to what phase movement use.
+roots((tip~100::) - (tip~100::tip))
+roots((0::) - (0::tip))
+
+# more roots testing
+roots(tip~100:)
+roots(:42)
+roots(not public())
+roots((0:tip)::)
+roots(0::tip)
+42:68 and roots(42:tip)
+# Used in revision f140d6207cca
+roots(0:tip)
+# test disjoint set with multiple roots
+roots((:42) + (tip~42:))
+
+# Testing the behavior of "head()" in various situations
+head()
+head() - public()
+draft() and head()
+head() and author("mpm")
+
+# testing the mutable phases set
+draft()
+secret()
+
+# test finding common ancestors
+heads(commonancestors(last(head(), 2)))
+heads(commonancestors(head()))

contrib/asv.conf.json

@@ -0,0 +1,13 b''
+{
+    "version": 1,
+    "project": "mercurial",
+    "project_url": "https://mercurial-scm.org/",
+    "repo": "..",
+    "branches": ["default", "stable"],
+    "environment_type": "virtualenv",
+    "show_commit_url": "https://www.mercurial-scm.org/repo/hg/rev/",
+    "benchmark_dir": "benchmarks",
+    "env_dir": "../.asv/env",
+    "results_dir": "../.asv/results",
+    "html_dir": "../.asv/html"
+}

contrib/base-revsets.txt

@@ -0,0 +1,49 b''
+# Base Revsets to be used with revsetbenchmarks.py script
+#
+# The goal of this file is to gather a limited amount of revsets that allow a
+# good coverage of the internal revsets mechanisms.  Revsets included should not
+# be selected for their individual implementation, but for what they reveal of
+# the internal implementation of smartsets classes (and their interactions).
+#
+# Use and update this file when you change internal implementation of these
+# smartsets classes. Please include a comment explaining what each of your
+# addition is testing. Also check if your changes to the smartset class makes
+# some of the tests inadequate and replace them with a new one testing the same
+# behavior.
+#
+# If you want to benchmark revsets predicate itself, check 'all-revsets.txt'.
+#
+# The current content of this file is currently likely not reaching this goal
+# entirely, feel free, to audit its content and comment on each revset to
+# highlight what internal mechanisms they test.
+
+all()
+draft()
+::tip
+draft() and ::tip
+::tip and draft()
+0::tip
+roots(0::tip)
+author(lmoscovicz)
+author(mpm)
+author(lmoscovicz) or author(mpm)
+author(mpm) or author(lmoscovicz)
+tip:0
+0::
+# those two `roots(...)` inputs are close to what phase movement use.
+roots((tip~100::) - (tip~100::tip))
+roots((0::) - (0::tip))
+42:68 and roots(42:tip)
+::p1(p1(tip))::
+public()
+:10000 and public()
+draft()
+:10000 and draft()
+roots((0:tip)::)
+(not public() - obsolete())
+(_intlist('20000\x0020001')) and merge()
+parents(20000)
+(20000::) - (20000)
+# The one below is used by rebase
+(children(ancestor(tip~5, tip)) and ::(tip~5))::
+heads(commonancestors(last(head(), 2)))

contrib/bash_completion

@@ -0,0 +1,644 b''
+# bash completion for the Mercurial distributed SCM -*- sh -*-
+
+# Docs:
+#
+# If you source this file from your .bashrc, bash should be able to
+# complete a command line that uses hg with all the available commands
+# and options and sometimes even arguments.
+#
+# Mercurial allows you to define additional commands through extensions.
+# Bash should be able to automatically figure out the name of these new
+# commands and their options.  See below for how to define _hg_opt_foo
+# and _hg_cmd_foo functions to fine-tune the completion for option and
+# non-option arguments, respectively.
+#
+#
+# Notes about completion for specific commands:
+#
+# - the completion function for the email command from the patchbomb
+#   extension will try to call _hg_emails to get a list of e-mail
+#   addresses.  It's up to the user to define this function.  For
+#   example, put the addresses of the lists that you usually patchbomb
+#   in ~/.patchbomb-to and the addresses that you usually use to send
+#   the patchbombs in ~/.patchbomb-from and use something like this:
+#
+#      _hg_emails()
+#      {
+#          if [ -r ~/.patchbomb-$1 ]; then
+#              cat ~/.patchbomb-$1
+#          fi
+#      }
+#
+#
+# Writing completion functions for additional commands:
+#
+# If it exists, the function _hg_cmd_foo will be called without
+# arguments to generate the completion candidates for the hg command
+# "foo".  If the command receives some arguments that aren't options
+# even though they start with a "-", you can define a function called
+# _hg_opt_foo to generate the completion candidates.  If _hg_opt_foo
+# doesn't return 0, regular completion for options is attempted.
+#
+# In addition to the regular completion variables provided by bash,
+# the following variables are also set:
+# - $hg - the hg program being used (e.g. /usr/bin/hg)
+# - $cmd - the name of the hg command being completed
+# - $cmd_index - the index of $cmd in $COMP_WORDS
+# - $cur - the current argument being completed
+# - $prev - the argument before $cur
+# - $global_args - "|"-separated list of global options that accept
+#                  an argument (e.g. '--cwd|-R|--repository')
+# - $canonical - 1 if we canonicalized $cmd before calling the function
+#                0 otherwise
+#
+
+shopt -s extglob
+
+_hg_cmd()
+{
+    HGPLAIN=1 "$hg" "$@" 2>/dev/null
+}
+
+_hg_commands()
+{
+    local commands
+    commands="$(HGPLAINEXCEPT=alias _hg_cmd debugcomplete "$cur")" || commands=""
+    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$commands' -- "$cur"))
+}
+
+_hg_paths()
+{
+    local paths="$(_hg_cmd paths -q)"
+    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$paths' -- "$cur"))
+}
+
+_hg_repos()
+{
+    local i
+    for i in $(compgen -d -- "$cur"); do
+        test ! -d "$i"/.hg || COMPREPLY=(${COMPREPLY[@]:-} "$i")
+    done
+}
+
+_hg_debugpathcomplete()
+{
+    local files="$(_hg_cmd debugpathcomplete $1 "$cur")"
+    local IFS=$'\n'
+    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$files' -- "$cur"))
+}
+
+_hg_status()
+{
+    if [ -z "$HGCOMPLETE_NOSTATUS" ]; then
+        local files="$(_hg_cmd status -n$1 "glob:$cur**")"
+        local IFS=$'\n'
+        COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$files' -- "$cur"))
+    fi
+}
+
+_hg_branches()
+{
+    local branches="$(_hg_cmd branches -q)"
+    local IFS=$'\n'
+    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$branches' -- "$cur"))
+}
+
+_hg_bookmarks()
+{
+    local bookmarks="$(_hg_cmd bookmarks -q)"
+    local IFS=$'\n'
+    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$bookmarks' -- "$cur"))
+}
+
+_hg_labels()
+{
+    local labels="$(_hg_cmd debugnamecomplete "$cur")"
+    local IFS=$'\n'
+    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$labels' -- "$cur"))
+}
+
+# this is "kind of" ugly...
+_hg_count_non_option()
+{
+    local i count=0
+    local filters="$1"
+
+    for ((i=1; $i<=$COMP_CWORD; i++)); do
+        if [[ "${COMP_WORDS[i]}" != -* ]]; then
+            if [[ ${COMP_WORDS[i-1]} == @($filters|$global_args) ]]; then
+                continue
+            fi
+            count=$(($count + 1))
+        fi
+    done
+
+    echo $(($count - 1))
+}
+
+_hg_fix_wordlist()
+{
+    local LASTCHAR=' '
+    if [ ${#COMPREPLY[@]} = 1 ]; then
+        [ -d "$COMPREPLY" ] && LASTCHAR=/
+        COMPREPLY=$(printf %q%s "$COMPREPLY" "$LASTCHAR")
+    else
+        for ((i=0; i < ${#COMPREPLY[@]}; i++)); do
+            [ -d "${COMPREPLY[$i]}" ] && COMPREPLY[$i]=${COMPREPLY[$i]}/
+        done
+    fi
+}
+
+_hg()
+{
+    local cur prev cmd cmd_index opts i aliashg
+    # global options that receive an argument
+    local global_args='--cwd|-R|--repository'
+    local hg="$1"
+    local canonical=0
+
+    aliashg=$(alias $hg 2>/dev/null)
+    if [[ -n "$aliashg" ]]; then
+      aliashg=${aliashg#"alias $hg='"}
+      aliashg=${aliashg%"'"}
+      hg=$aliashg
+    fi
+
+    COMPREPLY=()
+    cur="$2"
+    prev="$3"
+
+    # searching for the command
+    # (first non-option argument that doesn't follow a global option that
+    #  receives an argument)
+    for ((i=1; $i<=$COMP_CWORD; i++)); do
+        if [[ ${COMP_WORDS[i]} != -* ]]; then
+            if [[ ${COMP_WORDS[i-1]} != @($global_args) ]]; then
+                cmd="${COMP_WORDS[i]}"
+                cmd_index=$i
+                break
+            fi
+        fi
+    done
+
+    if [[ "$cur" == -* ]]; then
+        if [ "$(type -t "_hg_opt_$cmd")" = function ] && "_hg_opt_$cmd"; then
+            _hg_fix_wordlist
+            return
+        fi
+
+        opts=$(HGPLAINEXCEPT=alias _hg_cmd debugcomplete --options "$cmd")
+
+        COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$opts' -- "$cur"))
+        _hg_fix_wordlist
+        return
+    fi
+
+    # global options
+    case "$prev" in
+        -R|--repository)
+            _hg_paths
+            _hg_repos
+            _hg_fix_wordlist
+            return
+        ;;
+        --cwd)
+            # Stick with default bash completion
+            _hg_fix_wordlist
+            return
+        ;;
+    esac
+
+    if [ -z "$cmd" ] || [ $COMP_CWORD -eq $i ]; then
+        _hg_commands
+        _hg_fix_wordlist
+        return
+    fi
+
+    # try to generate completion candidates for whatever command the user typed
+    local help
+    if _hg_command_specific; then
+        _hg_fix_wordlist
+        return
+    fi
+
+    # canonicalize the command name and try again
+    help=$(_hg_cmd help "$cmd")
+    if [ $? -ne 0 ]; then
+        # Probably either the command doesn't exist or it's ambiguous
+        return
+    fi
+    cmd=${help#hg }
+    cmd=${cmd%%[$' \n']*}
+    canonical=1
+    _hg_command_specific
+    _hg_fix_wordlist
+}
+
+_hg_command_specific()
+{
+    if [ "$(type -t "_hg_cmd_$cmd")" = function ]; then
+        "_hg_cmd_$cmd"
+        return 0
+    fi
+
+    if [ "$cmd" != status ]; then
+        case "$prev" in
+            -r|--rev)
+                if [[ $canonical = 1 || status != "$cmd"* ]]; then
+                    _hg_labels
+                    return 0
+                fi
+                return 1
+            ;;
+            -B|--bookmark)
+                if [[ $canonical = 1 || status != "$cmd"* ]]; then
+                    _hg_bookmarks
+                    return 0
+                fi
+                return 1
+            ;;
+            -b|--branch)
+                if [[ $canonical = 1 || status != "$cmd"* ]]; then
+                    _hg_branches
+                    return 0
+                fi
+                return 1
+            ;;
+        esac
+    fi
+
+    local aliascmd=$(_hg_cmd showconfig alias.$cmd | awk '{print $1}')
+    [ -n "$aliascmd" ] && cmd=$aliascmd
+
+    case "$cmd" in
+        help)
+            _hg_commands
+        ;;
+        export)
+            if _hg_ext_mq_patchlist qapplied && [ "${COMPREPLY[*]}" ]; then
+                return 0
+            fi
+            _hg_labels
+        ;;
+        manifest|update|up|checkout|co)
+            _hg_labels
+        ;;
+        pull|push|outgoing|incoming)
+            _hg_paths
+            _hg_repos
+        ;;
+        paths)
+            _hg_paths
+        ;;
+        add)
+            _hg_status "u"
+        ;;
+        merge)
+            _hg_labels
+        ;;
+        commit|ci|record|amend)
+            _hg_status "mar"
+        ;;
+        remove|rm)
+            _hg_debugpathcomplete -n
+        ;;
+        forget)
+            _hg_debugpathcomplete -fa
+        ;;
+        diff)
+            _hg_status "mar"
+        ;;
+        revert)
+            _hg_status "mard"
+        ;;
+        clone)
+            local count=$(_hg_count_non_option)
+            if [ $count = 1 ]; then
+                _hg_paths
+            fi
+            _hg_repos
+        ;;
+        debugindex|debugindexdot)
+            COMPREPLY=(${COMPREPLY[@]:-} $(compgen -f -X "!*.i" -- "$cur"))
+        ;;
+        debugdata)
+            COMPREPLY=(${COMPREPLY[@]:-} $(compgen -f -X "!*.d" -- "$cur"))
+        ;;
+        *)
+            return 1
+        ;;
+    esac
+
+    return 0
+}
+
+complete -o bashdefault -o default -o nospace -F _hg hg \
+    || complete -o default -o nospace -F _hg hg
+
+
+# Completion for commands provided by extensions
+
+# bookmarks
+_hg_cmd_bookmarks()
+{
+    _hg_bookmarks
+    return
+}
+
+# mq
+_hg_ext_mq_patchlist()
+{
+    local patches
+    patches=$(_hg_cmd $1)
+    if [ $? -eq 0 ] && [ "$patches" ]; then
+        COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$patches' -- "$cur"))
+        return 0
+    fi
+    return 1
+}
+
+_hg_ext_mq_queues()
+{
+    local root=$(_hg_cmd root)
+    local n
+    for n in $(cd "$root"/.hg && compgen -d -- "$cur"); do
+        # I think we're usually not interested in the regular "patches" queue
+        # so just filter it.
+        if [ "$n" != patches ] && [ -e "$root/.hg/$n/series" ]; then
+            COMPREPLY=(${COMPREPLY[@]:-} "$n")
+        fi
+    done
+}
+
+_hg_cmd_qpop()
+{
+    if [[ "$prev" = @(-n|--name) ]]; then
+        _hg_ext_mq_queues
+        return
+    fi
+    _hg_ext_mq_patchlist qapplied
+}
+
+_hg_cmd_qpush()
+{
+    if [[ "$prev" = @(-n|--name) ]]; then
+        _hg_ext_mq_queues
+        return
+    fi
+    _hg_ext_mq_patchlist qunapplied
+}
+
+_hg_cmd_qgoto()
+{
+    if [[ "$prev" = @(-n|--name) ]]; then
+        _hg_ext_mq_queues
+        return
+    fi
+    _hg_ext_mq_patchlist qseries
+}
+
+_hg_cmd_qdelete()
+{
+    local qcmd=qunapplied
+    if [[ "$prev" = @(-r|--rev) ]]; then
+        qcmd=qapplied
+    fi
+    _hg_ext_mq_patchlist $qcmd
+}
+
+_hg_cmd_qfinish()
+{
+    if [[ "$prev" = @(-a|--applied) ]]; then
+        return
+    fi
+    _hg_ext_mq_patchlist qapplied
+}
+
+_hg_cmd_qsave()
+{
+    if [[ "$prev" = @(-n|--name) ]]; then
+        _hg_ext_mq_queues
+        return
+    fi
+}
+
+_hg_cmd_rebase() {
+   if [[ "$prev" = @(-s|--source|-d|--dest|-b|--base|-r|--rev) ]]; then
+       _hg_labels
+       return
+   fi
+}
+
+_hg_cmd_strip()
+{
+    if [[ "$prev" = @(-B|--bookmark) ]]; then
+        _hg_bookmarks
+        return
+    fi
+    _hg_labels
+}
+
+_hg_cmd_qcommit()
+{
+    local root=$(_hg_cmd root)
+    # this is run in a sub-shell, so we can't use _hg_status
+    local files=$(cd "$root/.hg/patches" && _hg_cmd status -nmar)
+    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$files' -- "$cur"))
+}
+
+_hg_cmd_qfold()
+{
+    _hg_ext_mq_patchlist qunapplied
+}
+
+_hg_cmd_qrename()
+{
+    _hg_ext_mq_patchlist qseries
+}
+
+_hg_cmd_qheader()
+{
+    _hg_ext_mq_patchlist qseries
+}
+
+_hg_cmd_qclone()
+{
+    local count=$(_hg_count_non_option)
+    if [ $count = 1 ]; then
+        _hg_paths
+    fi
+    _hg_repos
+}
+
+_hg_ext_mq_guards()
+{
+    _hg_cmd qselect --series | sed -e 's/^.//'
+}
+
+_hg_cmd_qselect()
+{
+    local guards=$(_hg_ext_mq_guards)
+    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$guards' -- "$cur"))
+}
+
+_hg_cmd_qguard()
+{
+    local prefix=''
+
+    if [[ "$cur" == +* ]]; then
+        prefix=+
+    elif [[ "$cur" == -* ]]; then
+        prefix=-
+    fi
+    local ncur=${cur#[-+]}
+
+    if ! [ "$prefix" ]; then
+        _hg_ext_mq_patchlist qseries
+        return
+    fi
+
+    local guards=$(_hg_ext_mq_guards)
+    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -P $prefix -W '$guards' -- "$ncur"))
+}
+
+_hg_opt_qguard()
+{
+    local i
+    for ((i=cmd_index+1; i<=COMP_CWORD; i++)); do
+        if [[ ${COMP_WORDS[i]} != -* ]]; then
+            if [[ ${COMP_WORDS[i-1]} != @($global_args) ]]; then
+                _hg_cmd_qguard
+                return 0
+            fi
+        elif [ "${COMP_WORDS[i]}" = -- ]; then
+            _hg_cmd_qguard
+            return 0
+        fi
+    done
+    return 1
+}
+
+_hg_cmd_qqueue()
+{
+    local q
+    local queues
+    local opts="--list --create --rename --delete --purge"
+
+    queues=$( _hg_cmd qqueue --quiet )
+
+    COMPREPLY=( $( compgen -W "${opts} ${queues}" "${cur}" ) )
+}
+
+
+# hbisect
+_hg_cmd_bisect()
+{
+    local i subcmd
+
+    # find the sub-command
+    for ((i=cmd_index+1; i<=COMP_CWORD; i++)); do
+        if [[ ${COMP_WORDS[i]} != -* ]]; then
+            if [[ ${COMP_WORDS[i-1]} != @($global_args) ]]; then
+                subcmd="${COMP_WORDS[i]}"
+                break
+            fi
+        fi
+    done
+
+    if [ -z "$subcmd" ] || [ $COMP_CWORD -eq $i ] || [ "$subcmd" = help ]; then
+        COMPREPLY=(${COMPREPLY[@]:-}
+                   $(compgen -W 'bad good help init next reset' -- "$cur"))
+        return
+    fi
+
+    case "$subcmd" in
+        good|bad)
+            _hg_labels
+            ;;
+    esac
+
+    return
+}
+
+
+# patchbomb
+_hg_cmd_email()
+{
+    case "$prev" in
+        -c|--cc|-t|--to|-f|--from|--bcc)
+            # we need an e-mail address. let the user provide a function
+            # to get them
+            if [ "$(type -t _hg_emails)" = function ]; then
+                local arg=to
+                if [[ "$prev" == @(-f|--from) ]]; then
+                    arg=from
+                fi
+                local addresses=$(_hg_emails $arg)
+                COMPREPLY=(${COMPREPLY[@]:-}
+                           $(compgen -W '$addresses' -- "$cur"))
+            fi
+            return
+            ;;
+        -m|--mbox)
+            # fallback to standard filename completion
+            return
+            ;;
+        -s|--subject)
+            # free form string
+            return
+            ;;
+    esac
+
+    _hg_labels
+    return
+}
+
+
+# gpg
+_hg_cmd_sign()
+{
+    _hg_labels
+}
+
+
+# transplant
+_hg_cmd_transplant()
+{
+    case "$prev" in
+        -s|--source)
+            _hg_paths
+            _hg_repos
+            return
+            ;;
+        --filter)
+            # standard filename completion
+            return
+            ;;
+    esac
+
+    # all other transplant options values and command parameters are revisions
+    _hg_labels
+    return
+}
+
+# shelve
+_hg_shelves()
+{
+    local shelves="$(_hg_cmd shelve -ql)"
+    local IFS=$'\n'
+    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$shelves' -- "$cur"))
+}
+
+_hg_cmd_shelve()
+{
+    if [[ "$prev" = @(-d|--delete|-l|--list|-p|--patch|--stat) ]]; then
+        _hg_shelves
+    else
+        _hg_status "mard"
+    fi
+}
+
+_hg_cmd_unshelve()
+{
+    _hg_shelves
+}

contrib/bdiff-torture.py

@@ -0,0 +1,99 b''
+# Randomized torture test generation for bdiff
+
+from __future__ import absolute_import, print_function
+import random
+import sys
+
+from mercurial import (
+    mdiff,
+)
+
+def reducetest(a, b):
+    tries = 0
+    reductions = 0
+    print("reducing...")
+    while tries < 1000:
+        a2 = "\n".join(l for l in a.splitlines()
+                       if random.randint(0, 100) > 0) + "\n"
+        b2 = "\n".join(l for l in b.splitlines()
+                       if random.randint(0, 100) > 0) + "\n"
+        if a2 == a and b2 == b:
+            continue
+        if a2 == b2:
+            continue
+        tries += 1
+
+        try:
+            test1(a, b)
+        except Exception as inst:
+            reductions += 1
+            tries = 0
+            a = a2
+            b = b2
+
+    print("reduced:", reductions, len(a) + len(b),
+          repr(a), repr(b))
+    try:
+        test1(a, b)
+    except Exception as inst:
+        print("failed:", inst)
+
+    sys.exit(0)
+
+def test1(a, b):
+    d = mdiff.textdiff(a, b)
+    if not d:
+        raise ValueError("empty")
+    c = mdiff.patches(a, [d])
+    if c != b:
+        raise ValueError("bad")
+
+def testwrap(a, b):
+    try:
+        test1(a, b)
+        return
+    except Exception as inst:
+        pass
+    print("exception:", inst)
+    reducetest(a, b)
+
+def test(a, b):
+    testwrap(a, b)
+    testwrap(b, a)
+
+def rndtest(size, noise):
+    a = []
+    src = "                aaaaaaaabbbbccd"
+    for x in xrange(size):
+        a.append(src[random.randint(0, len(src) - 1)])
+
+    while True:
+        b = [c for c in a if random.randint(0, 99) > noise]
+        b2 = []
+        for c in b:
+            b2.append(c)
+            while random.randint(0, 99) < noise:
+                b2.append(src[random.randint(0, len(src) - 1)])
+        if b2 != a:
+            break
+
+    a = "\n".join(a) + "\n"
+    b = "\n".join(b2) + "\n"
+
+    test(a, b)
+
+maxvol = 10000
+startsize = 2
+while True:
+    size = startsize
+    count = 0
+    while size < maxvol:
+        print(size)
+        volume = 0
+        while volume < maxvol:
+            rndtest(size, 2)
+            volume += size
+            count += 2
+        size *= 2
+    maxvol *= 4
+    startsize *= 4

contrib/benchmarks/__init__.py

@@ -0,0 +1,113 b''
+# __init__.py - asv benchmark suite
+#
+# Copyright 2016 Logilab SA <[e-mail]>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+# "historical portability" policy of contrib/benchmarks:
+#
+# We have to make this code work correctly with current mercurial stable branch
+# and if possible with reasonable cost with early Mercurial versions.
+
+'''ASV (https://asv.readthedocs.io) benchmark suite
+
+Benchmark are parameterized against reference repositories found in the
+directory pointed by the REPOS_DIR environment variable.
+
+Invocation example:
+
+    $ export REPOS_DIR=~/hgperf/repos
+    # run suite on given revision
+    $ asv --config contrib/asv.conf.json run REV
+    # run suite on new changesets found in stable and default branch
+    $ asv --config contrib/asv.conf.json run NEW
+    # display a comparative result table of benchmark results between two given
+    # revisions
+    $ asv --config contrib/asv.conf.json compare REV1 REV2
+    # compute regression detection and generate ASV static website
+    $ asv --config contrib/asv.conf.json publish
+    # serve the static website
+    $ asv --config contrib/asv.conf.json preview
+'''
+
+from __future__ import absolute_import
+
+import functools
+import os
+import re
+
+from mercurial import (
+    extensions,
+    hg,
+    ui as uimod,
+    util,
+)
+
+basedir = os.path.abspath(os.path.join(os.path.dirname(__file__),
+                          os.path.pardir, os.path.pardir))
+reposdir = os.environ['REPOS_DIR']
+reposnames = [name for name in os.listdir(reposdir)
+              if os.path.isdir(os.path.join(reposdir, name, ".hg"))]
+if not reposnames:
+    raise ValueError("No repositories found in $REPO_DIR")
+outputre = re.compile((r'! wall (\d+.\d+) comb \d+.\d+ user \d+.\d+ sys '
+                       r'\d+.\d+ \(best of \d+\)'))
+
+def runperfcommand(reponame, command, *args, **kwargs):
+    os.environ["HGRCPATH"] = os.environ.get("ASVHGRCPATH", "")
+    # for "historical portability"
+    # ui.load() has been available since d83ca85
+    if util.safehasattr(uimod.ui, "load"):
+        ui = uimod.ui.load()
+    else:
+        ui = uimod.ui()
+    repo = hg.repository(ui, os.path.join(reposdir, reponame))
+    perfext = extensions.load(ui, 'perfext',
+                              os.path.join(basedir, 'contrib', 'perf.py'))
+    cmd = getattr(perfext, command)
+    ui.pushbuffer()
+    cmd(ui, repo, *args, **kwargs)
+    output = ui.popbuffer()
+    match = outputre.search(output)
+    if not match:
+        raise ValueError("Invalid output {0}".format(output))
+    return float(match.group(1))
+
+def perfbench(repos=reposnames, name=None, params=None):
+    """decorator to declare ASV benchmark based on contrib/perf.py extension
+
+    An ASV benchmark is a python function with the given attributes:
+
+    __name__: should start with track_, time_ or mem_ to be collected by ASV
+    params and param_name: parameter matrix to display multiple graphs on the
+    same page.
+    pretty_name: If defined it's displayed in web-ui instead of __name__
+    (useful for revsets)
+    the module name is prepended to the benchmark name and displayed as
+    "category" in webui.
+
+    Benchmarks are automatically parameterized with repositories found in the
+    REPOS_DIR environment variable.
+
+    `params` is the param matrix in the form of a list of tuple
+    (param_name, [value0, value1])
+
+    For example [(x, [a, b]), (y, [c, d])] declare benchmarks for
+    (a, c), (a, d), (b, c) and (b, d).
+    """
+    params = list(params or [])
+    params.insert(0, ("repo", repos))
+
+    def decorator(func):
+        @functools.wraps(func)
+        def wrapped(repo, *args):
+            def perf(command, *a, **kw):
+                return runperfcommand(repo, command, *a, **kw)
+            return func(perf, *args)
+
+        wrapped.params = [p[1] for p in params]
+        wrapped.param_names = [p[0] for p in params]
+        wrapped.pretty_name = name
+        return wrapped
+    return decorator

contrib/benchmarks/perf.py

@@ -0,0 +1,26 b''
+# perf.py - asv benchmarks using contrib/perf.py extension
+#
+# Copyright 2016 Logilab SA <[e-mail]>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+from __future__ import absolute_import
+
+from . import perfbench
+
+@perfbench()
+def track_tags(perf):
+    return perf("perftags")
+
+@perfbench()
+def track_status(perf):
+    return perf("perfstatus", unknown=False)
+
+@perfbench(params=[('rev', ['1000', '10000', 'tip'])])
+def track_manifest(perf, rev):
+    return perf("perfmanifest", rev)
+
+@perfbench()
+def track_heads(perf):
+    return perf("perfheads")

contrib/benchmarks/revset.py

@@ -0,0 +1,53 b''
+# revset.py - asv revset benchmarks
+#
+# Copyright 2016 Logilab SA <[e-mail]>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+'''ASV revset benchmarks generated from contrib/base-revsets.txt
+
+Each revset benchmark is parameterized with variants (first, last, sort, ...)
+'''
+
+from __future__ import absolute_import
+
+import os
+import string
+import sys
+
+from . import basedir, perfbench
+
+def createrevsetbenchmark(baseset, variants=None):
+    if variants is None:
+        # Default variants
+        variants = ["plain", "first", "last", "sort", "sort+first",
+                    "sort+last"]
+    fname = "track_" + "_".join("".join([
+        c if c in string.digits + string.letters else " "
+        for c in baseset
+    ]).split())
+
+    def wrap(fname, baseset):
+        @perfbench(name=baseset, params=[("variant", variants)])
+        def f(perf, variant):
+            revset = baseset
+            if variant != "plain":
+                for var in variant.split("+"):
+                    revset = "%s(%s)" % (var, revset)
+            return perf("perfrevset", revset)
+        f.__name__ = fname
+        return f
+    return wrap(fname, baseset)
+
+def initializerevsetbenchmarks():
+    mod = sys.modules[__name__]
+    with open(os.path.join(basedir, 'contrib', 'base-revsets.txt'),
+              'rb') as fh:
+        for line in fh:
+            baseset = line.strip()
+            if baseset and not baseset.startswith('#'):
+                func = createrevsetbenchmark(baseset)
+                setattr(mod, func.__name__, func)
+
+initializerevsetbenchmarks()

contrib/byteify-strings.py

@@ -0,0 +1,225 b''
+#!/usr/bin/env python3
+#
+# byteify-strings.py - transform string literals to be Python 3 safe
+#
+# Copyright 2015 Gregory Szorc <[e-mail]>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+from __future__ import absolute_import
+
+import argparse
+import contextlib
+import errno
+import os
+import sys
+import tempfile
+import token
+import tokenize
+
+def adjusttokenpos(t, ofs):
+    """Adjust start/end column of the given token"""
+    return t._replace(start=(t.start[0], t.start[1] + ofs),
+                      end=(t.end[0], t.end[1] + ofs))
+
+def replacetokens(tokens, opts):
+    """Transform a stream of tokens from raw to Python 3.
+
+    Returns a generator of possibly rewritten tokens.
+
+    The input token list may be mutated as part of processing. However,
+    its changes do not necessarily match the output token stream.
+    """
+    sysstrtokens = set()
+
+    # The following utility functions access the tokens list and i index of
+    # the for i, t enumerate(tokens) loop below
+    def _isop(j, *o):
+        """Assert that tokens[j] is an OP with one of the given values"""
+        try:
+            return tokens[j].type == token.OP and tokens[j].string in o
+        except IndexError:
+            return False
+
+    def _findargnofcall(n):
+        """Find arg n of a call expression (start at 0)
+
+        Returns index of the first token of that argument, or None if
+        there is not that many arguments.
+
+        Assumes that token[i + 1] is '('.
+
+        """
+        nested = 0
+        for j in range(i + 2, len(tokens)):
+            if _isop(j, ')', ']', '}'):
+                # end of call, tuple, subscription or dict / set
+                nested -= 1
+                if nested < 0:
+                    return None
+            elif n == 0:
+                # this is the starting position of arg
+                return j
+            elif _isop(j, '(', '[', '{'):
+                nested += 1
+            elif _isop(j, ',') and nested == 0:
+                n -= 1
+
+        return None
+
+    def _ensuresysstr(j):
+        """Make sure the token at j is a system string
+
+        Remember the given token so the string transformer won't add
+        the byte prefix.
+
+        Ignores tokens that are not strings. Assumes bounds checking has
+        already been done.
+
+        """
+        st = tokens[j]
+        if st.type == token.STRING and st.string.startswith(("'", '"')):
+            sysstrtokens.add(st)
+
+    coldelta = 0  # column increment for new opening parens
+    coloffset = -1  # column offset for the current line (-1: TBD)
+    parens = [(0, 0, 0)]  # stack of (line, end-column, column-offset)
+    for i, t in enumerate(tokens):
+        # Compute the column offset for the current line, such that
+        # the current line will be aligned to the last opening paren
+        # as before.
+        if coloffset < 0:
+            if t.start[1] == parens[-1][1]:
+                coloffset = parens[-1][2]
+            elif t.start[1] + 1 == parens[-1][1]:
+                # fix misaligned indent of s/util.Abort/error.Abort/
+                coloffset = parens[-1][2] + (parens[-1][1] - t.start[1])
+            else:
+                coloffset = 0
+
+        # Reset per-line attributes at EOL.
+        if t.type in (token.NEWLINE, tokenize.NL):
+            yield adjusttokenpos(t, coloffset)
+            coldelta = 0
+            coloffset = -1
+            continue
+
+        # Remember the last paren position.
+        if _isop(i, '(', '[', '{'):
+            parens.append(t.end + (coloffset + coldelta,))
+        elif _isop(i, ')', ']', '}'):
+            parens.pop()
+
+        # Convert most string literals to byte literals. String literals
+        # in Python 2 are bytes. String literals in Python 3 are unicode.
+        # Most strings in Mercurial are bytes and unicode strings are rare.
+        # Rather than rewrite all string literals to use ``b''`` to indicate
+        # byte strings, we apply this token transformer to insert the ``b``
+        # prefix nearly everywhere.
+        if t.type == token.STRING and t not in sysstrtokens:
+            s = t.string
+
+            # Preserve docstrings as string literals. This is inconsistent
+            # with regular unprefixed strings. However, the
+            # "from __future__" parsing (which allows a module docstring to
+            # exist before it) doesn't properly handle the docstring if it
+            # is b''' prefixed, leading to a SyntaxError. We leave all
+            # docstrings as unprefixed to avoid this. This means Mercurial
+            # components touching docstrings need to handle unicode,
+            # unfortunately.
+            if s[0:3] in ("'''", '"""'):
+                yield adjusttokenpos(t, coloffset)
+                continue
+
+            # If the first character isn't a quote, it is likely a string
+            # prefixing character (such as 'b', 'u', or 'r'. Ignore.
+            if s[0] not in ("'", '"'):
+                yield adjusttokenpos(t, coloffset)
+                continue
+
+            # String literal. Prefix to make a b'' string.
+            yield adjusttokenpos(t._replace(string='b%s' % t.string),
+                                 coloffset)
+            coldelta += 1
+            continue
+
+        # This looks like a function call.
+        if t.type == token.NAME and _isop(i + 1, '('):
+            fn = t.string
+
+            # *attr() builtins don't accept byte strings to 2nd argument.
+            if (fn in ('getattr', 'setattr', 'hasattr', 'safehasattr') and
+                    not _isop(i - 1, '.')):
+                arg1idx = _findargnofcall(1)
+                if arg1idx is not None:
+                    _ensuresysstr(arg1idx)
+
+            # .encode() and .decode() on str/bytes/unicode don't accept
+            # byte strings on Python 3.
+            elif fn in ('encode', 'decode') and _isop(i - 1, '.'):
+                for argn in range(2):
+                    argidx = _findargnofcall(argn)
+                    if argidx is not None:
+                        _ensuresysstr(argidx)
+
+            # It changes iteritems/values to items/values as they are not
+            # present in Python 3 world.
+            elif opts['dictiter'] and fn in ('iteritems', 'itervalues'):
+                yield adjusttokenpos(t._replace(string=fn[4:]), coloffset)
+                continue
+
+        # Emit unmodified token.
+        yield adjusttokenpos(t, coloffset)
+
+def process(fin, fout, opts):
+    tokens = tokenize.tokenize(fin.readline)
+    tokens = replacetokens(list(tokens), opts)
+    fout.write(tokenize.untokenize(tokens))
+
+def tryunlink(fname):
+    try:
+        os.unlink(fname)
+    except OSError as err:
+        if err.errno != errno.ENOENT:
+            raise
+
[e-mail]
+def editinplace(fname):
+    n = os.path.basename(fname)
+    d = os.path.dirname(fname)
+    fp = tempfile.NamedTemporaryFile(prefix='.%s-' % n, suffix='~', dir=d,
+                                     delete=False)
+    try:
+        yield fp
+        fp.close()
+        if os.name == 'nt':
+            tryunlink(fname)
+        os.rename(fp.name, fname)
+    finally:
+        fp.close()
+        tryunlink(fp.name)
+
+def main():
+    ap = argparse.ArgumentParser()
+    ap.add_argument('-i', '--inplace', action='store_true', default=False,
+                    help='edit files in place')
+    ap.add_argument('--dictiter', action='store_true', default=False,
+                    help='rewrite iteritems() and itervalues()'),
+    ap.add_argument('files', metavar='FILE', nargs='+', help='source file')
+    args = ap.parse_args()
+    opts = {
+        'dictiter': args.dictiter,
+    }
+    for fname in args.files:
+        if args.inplace:
+            with editinplace(fname) as fout:
+                with open(fname, 'rb') as fin:
+                    process(fin, fout, opts)
+        else:
+            with open(fname, 'rb') as fin:
+                fout = sys.stdout.buffer
+                process(fin, fout, opts)
+
+if __name__ == '__main__':
+    main()

contrib/casesmash.py

@@ -0,0 +1,38 b''
+from __future__ import absolute_import
+import __builtin__
+import os
+from mercurial import (
+    util,
+)
+
+def lowerwrap(scope, funcname):
+    f = getattr(scope, funcname)
+    def wrap(fname, *args, **kwargs):
+        d, base = os.path.split(fname)
+        try:
+            files = os.listdir(d or '.')
+        except OSError:
+            files = []
+        if base in files:
+            return f(fname, *args, **kwargs)
+        for fn in files:
+            if fn.lower() == base.lower():
+                return f(os.path.join(d, fn), *args, **kwargs)
+        return f(fname, *args, **kwargs)
+    scope.__dict__[funcname] = wrap
+
+def normcase(path):
+    return path.lower()
+
+os.path.normcase = normcase
+
+for f in 'file open'.split():
+    lowerwrap(__builtin__, f)
+
+for f in "chmod chown open lstat stat remove unlink".split():
+    lowerwrap(os, f)
+
+for f in "exists lexists".split():
+    lowerwrap(os.path, f)
+
+lowerwrap(util, 'posixfile')

contrib/check-code.py

@@ -0,0 +1,743 b''
+#!/usr/bin/env python
+#
+# check-code - a style and portability checker for Mercurial
+#
+# Copyright 2010 Matt Mackall <[e-mail]>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+"""style and portability checker for Mercurial
+
+when a rule triggers wrong, do one of the following (prefer one from top):
+ * do the work-around the rule suggests
+ * doublecheck that it is a false match
+ * improve the rule pattern
+ * add an ignore pattern to the rule (3rd arg) which matches your good line
+   (you can append a short comment and match this, like: #re-raises)
+ * change the pattern to a warning and list the exception in test-check-code-hg
+ * ONLY use no--check-code for skipping entire files from external sources
+"""
+
+from __future__ import absolute_import, print_function
+import glob
+import keyword
+import optparse
+import os
+import re
+import sys
+if sys.version_info[0] < 3:
+    opentext = open
+else:
+    def opentext(f):
+        return open(f, encoding='ascii')
+try:
+    xrange
+except NameError:
+    xrange = range
+try:
+    import re2
+except ImportError:
+    re2 = None
+
+def compilere(pat, multiline=False):
+    if multiline:
+        pat = '(?m)' + pat
+    if re2:
+        try:
+            return re2.compile(pat)
+        except re2.error:
+            pass
+    return re.compile(pat)
+
+# check "rules depending on implementation of repquote()" in each
+# patterns (especially pypats), before changing around repquote()
+_repquotefixedmap = {' ': ' ', '\n': '\n', '.': 'p', ':': 'q',
+                     '%': '%', '\\': 'b', '*': 'A', '+': 'P', '-': 'M'}
+def _repquoteencodechr(i):
+    if i > 255:
+        return 'u'
+    c = chr(i)
+    if c in _repquotefixedmap:
+        return _repquotefixedmap[c]
+    if c.isalpha():
+        return 'x'
+    if c.isdigit():
+        return 'n'
+    return 'o'
+_repquotett = ''.join(_repquoteencodechr(i) for i in xrange(256))
+
+def repquote(m):
+    t = m.group('text')
+    t = t.translate(_repquotett)
+    return m.group('quote') + t + m.group('quote')
+
+def reppython(m):
+    comment = m.group('comment')
+    if comment:
+        l = len(comment.rstrip())
+        return "#" * l + comment[l:]
+    return repquote(m)
+
+def repcomment(m):
+    return m.group(1) + "#" * len(m.group(2))
+
+def repccomment(m):
+    t = re.sub(r"((?<=\n) )|\S", "x", m.group(2))
+    return m.group(1) + t + "*/"
+
+def repcallspaces(m):
+    t = re.sub(r"\n\s+", "\n", m.group(2))
+    return m.group(1) + t
+
+def repinclude(m):
+    return m.group(1) + "<foo>"
+
+def rephere(m):
+    t = re.sub(r"\S", "x", m.group(2))
+    return m.group(1) + t
+
+
+testpats = [
+  [
+    (r'\b(push|pop)d\b', "don't use 'pushd' or 'popd', use 'cd'"),
+    (r'\W\$?\(\([^\)\n]*\)\)', "don't use (()) or $(()), use 'expr'"),
+    (r'grep.*-q', "don't use 'grep -q', redirect to /dev/null"),
+    (r'(?<!hg )grep.* -a', "don't use 'grep -a', use in-line python"),
+    (r'sed.*-i', "don't use 'sed -i', use a temporary file"),
+    (r'\becho\b.*\\n', "don't use 'echo \\n', use printf"),
+    (r'echo -n', "don't use 'echo -n', use printf"),
+    (r'(^|\|\s*)\bwc\b[^|]*$\n(?!.*\(re\))', "filter wc output"),
+    (r'head -c', "don't use 'head -c', use 'dd'"),
+    (r'tail -n', "don't use the '-n' option to tail, just use '-<num>'"),
+    (r'sha1sum', "don't use sha1sum, use $TESTDIR/md5sum.py"),
+    (r'\bls\b.*-\w*R', "don't use 'ls -R', use 'find'"),
+    (r'printf.*[^\\]\\([1-9]|0\d)', r"don't use 'printf \NNN', use Python"),
+    (r'printf.*[^\\]\\x', "don't use printf \\x, use Python"),
+    (r'\$\(.*\)', "don't use $(expr), use `expr`"),
+    (r'rm -rf \*', "don't use naked rm -rf, target a directory"),
+    (r'\[[^\]]+==', '[ foo == bar ] is a bashism, use [ foo = bar ] instead'),
+    (r'(^|\|\s*)grep (-\w\s+)*[^|]*[(|]\w',
+     "use egrep for extended grep syntax"),
+    (r'(^|\|\s*)e?grep .*\\S', "don't use \\S in regular expression"),
+    (r'(?<!!)/bin/', "don't use explicit paths for tools"),
+    (r'#!.*/bash', "don't use bash in shebang, use sh"),
+    (r'[^\n]\Z', "no trailing newline"),
+    (r'export .*=', "don't export and assign at once"),
+    (r'^source\b', "don't use 'source', use '.'"),
+    (r'touch -d', "don't use 'touch -d', use 'touch -t' instead"),
+    (r'\bls +[^|\n-]+ +-', "options to 'ls' must come before filenames"),
+    (r'[^>\n]>\s*\$HGRCPATH', "don't overwrite $HGRCPATH, append to it"),
+    (r'^stop\(\)', "don't use 'stop' as a shell function name"),
+    (r'(\[|\btest\b).*-e ', "don't use 'test -e', use 'test -f'"),
+    (r'\[\[\s+[^\]]*\]\]', "don't use '[[ ]]', use '[ ]'"),
+    (r'^alias\b.*=', "don't use alias, use a function"),
+    (r'if\s*!', "don't use '!' to negate exit status"),
+    (r'/dev/u?random', "don't use entropy, use /dev/zero"),
+    (r'do\s*true;\s*done', "don't use true as loop body, use sleep 0"),
+    (r'sed (-e )?\'(\d+|/[^/]*/)i(?!\\\n)',
+     "put a backslash-escaped newline after sed 'i' command"),
+    (r'^diff *-\w*[uU].*$\n(^  \$ |^$)', "prefix diff -u/-U with cmp"),
+    (r'^\s+(if)? diff *-\w*[uU]', "prefix diff -u/-U with cmp"),
+    (r'[\s="`\']python\s(?!bindings)', "don't use 'python', use '$PYTHON'"),
+    (r'seq ', "don't use 'seq', use $TESTDIR/seq.py"),
+    (r'\butil\.Abort\b', "directly use error.Abort"),
+    (r'\|&', "don't use |&, use 2>&1"),
+    (r'\w =  +\w', "only one space after = allowed"),
+    (r'\bsed\b.*[^\\]\\n', "don't use 'sed ... \\n', use a \\ and a newline"),
+    (r'env.*-u', "don't use 'env -u VAR', use 'unset VAR'"),
+    (r'cp.* -r ', "don't use 'cp -r', use 'cp -R'"),
+    (r'grep.* -[ABC]', "don't use grep's context flags"),
+    (r'find.*-printf',
+     "don't use 'find -printf', it doesn't exist on BSD find(1)"),
+    (r'\$RANDOM ', "don't use bash-only $RANDOM to generate random values"),
+  ],
+  # warnings
+  [
+    (r'^function', "don't use 'function', use old style"),
+    (r'^diff.*-\w*N', "don't use 'diff -N'"),
+    (r'\$PWD|\${PWD}', "don't use $PWD, use `pwd`"),
+    (r'^([^"\'\n]|("[^"\n]*")|(\'[^\'\n]*\'))*\^', "^ must be quoted"),
+    (r'kill (`|\$\()', "don't use kill, use killdaemons.py")
+  ]
+]
+
+testfilters = [
+    (r"( *)(#([^!][^\n]*\S)?)", repcomment),
+    (r"<<(\S+)((.|\n)*?\n\1)", rephere),
+]
+
+uprefix = r"^  \$ "
+utestpats = [
+  [
+    (r'^(\S.*||  [$>] \S.*)[ \t]\n', "trailing whitespace on non-output"),
+    (uprefix + r'.*\|\s*sed[^|>\n]*\n',
+     "use regex test output patterns instead of sed"),
+    (uprefix + r'(true|exit 0)', "explicit zero exit unnecessary"),
+    (uprefix + r'.*(?<!\[)\$\?', "explicit exit code checks unnecessary"),
+    (uprefix + r'.*\|\| echo.*(fail|error)',
+     "explicit exit code checks unnecessary"),
+    (uprefix + r'set -e', "don't use set -e"),
+    (uprefix + r'(\s|fi\b|done\b)', "use > for continued lines"),
+    (uprefix + r'.*:\.\S*/', "x:.y in a path does not work on msys, rewrite "
+     "as x://.y, or see `hg log -k msys` for alternatives", r'-\S+:\.|' #-Rxxx
+     '# no-msys'), # in test-pull.t which is skipped on windows
+    (r'^  [^$>].*27\.0\.0\.1',
+     'use $LOCALIP not an explicit loopback address'),
+    (r'^  (?![>$] ).*\$LOCALIP.*[^)]$',
+     'mark $LOCALIP output lines with (glob) to help tests in BSD jails'),
+    (r'^  (cat|find): .*: \$ENOENT\$',
+     'use test -f to test for file existence'),
+    (r'^  diff -[^ -]*p',
+     "don't use (external) diff with -p for portability"),
+    (r' readlink ', 'use readlink.py instead of readlink'),
+    (r'^  [-+][-+][-+] .* [-+]0000 \(glob\)',
+     "glob timezone field in diff output for portability"),
+    (r'^  @@ -[0-9]+ [+][0-9]+,[0-9]+ @@',
+     "use '@@ -N* +N,n @@ (glob)' style chunk header for portability"),
+    (r'^  @@ -[0-9]+,[0-9]+ [+][0-9]+ @@',
+     "use '@@ -N,n +N* @@ (glob)' style chunk header for portability"),
+    (r'^  @@ -[0-9]+ [+][0-9]+ @@',
+     "use '@@ -N* +N* @@ (glob)' style chunk header for portability"),
+    (uprefix + r'hg( +-[^ ]+( +[^ ]+)?)* +extdiff'
+     r'( +(-[^ po-]+|--(?!program|option)[^ ]+|[^-][^ ]*))*$',
+     "use $RUNTESTDIR/pdiff via extdiff (or -o/-p for false-positives)"),
+  ],
+  # warnings
+  [
+    (r'^  (?!.*\$LOCALIP)[^*?/\n]* \(glob\)$',
+     "glob match with no glob string (?, *, /, and $LOCALIP)"),
+  ]
+]
+
+# transform plain test rules to unified test's
+for i in [0, 1]:
+    for tp in testpats[i]:
+        p = tp[0]
+        m = tp[1]
+        if p.startswith(r'^'):
+            p = r"^  [$>] (%s)" % p[1:]
+        else:
+            p = r"^  [$>] .*(%s)" % p
+        utestpats[i].append((p, m) + tp[2:])
+
+# don't transform the following rules:
+# "  > \t" and "  \t" should be allowed in unified tests
+testpats[0].append((r'^( *)\t', "don't use tabs to indent"))
+utestpats[0].append((r'^( ?)\t', "don't use tabs to indent"))
+
+utestfilters = [
+    (r"<<(\S+)((.|\n)*?\n  > \1)", rephere),
+    (r"( +)(#([^!][^\n]*\S)?)", repcomment),
+]
+
+pypats = [
+  [
+    (r'^\s*def\s*\w+\s*\(.*,\s*\(',
+     "tuple parameter unpacking not available in Python 3+"),
+    (r'lambda\s*\(.*,.*\)',
+     "tuple parameter unpacking not available in Python 3+"),
+    (r'(?<!def)\s+(cmp)\(', "cmp is not available in Python 3+"),
+    (r'(?<!\.)\breduce\s*\(.*', "reduce is not available in Python 3+"),
+    (r'\bdict\(.*=', 'dict() is different in Py2 and 3 and is slower than {}',
+     'dict-from-generator'),
+    (r'\.has_key\b', "dict.has_key is not available in Python 3+"),
+    (r'\s<>\s', '<> operator is not available in Python 3+, use !='),
+    (r'^\s*\t', "don't use tabs"),
+    (r'\S;\s*\n', "semicolon"),
+    (r'[^_]_\([ \t\n]*(?:"[^"]+"[ \t\n+]*)+%', "don't use % inside _()"),
+    (r"[^_]_\([ \t\n]*(?:'[^']+'[ \t\n+]*)+%", "don't use % inside _()"),
+    (r'(\w|\)),\w', "missing whitespace after ,"),
+    (r'(\w|\))[+/*\-<>]\w', "missing whitespace in expression"),
+    (r'^\s+(\w|\.)+=\w[^,()\n]*$', "missing whitespace in assignment"),
+    (r'\w\s=\s\s+\w', "gratuitous whitespace after ="),
+    ((
+        # a line ending with a colon, potentially with trailing comments
+        r':([ \t]*#[^\n]*)?\n'
+        # one that is not a pass and not only a comment
+        r'(?P<indent>[ \t]+)[^#][^\n]+\n'
+        # more lines at the same indent level
+        r'((?P=indent)[^\n]+\n)*'
+        # a pass at the same indent level, which is bogus
+        r'(?P=indent)pass[ \t\n#]'
+      ), 'omit superfluous pass'),
+    (r'.{81}', "line too long"),
+    (r'[^\n]\Z', "no trailing newline"),
+    (r'(\S[ \t]+|^[ \t]+)\n', "trailing whitespace"),
+#    (r'^\s+[^_ \n][^_. \n]+_[^_\n]+\s*=',
+#     "don't use underbars in identifiers"),
+    (r'^\s+(self\.)?[A-Za-z][a-z0-9]+[A-Z]\w* = ',
+     "don't use camelcase in identifiers", r'#.*camelcase-required'),
+    (r'^\s*(if|while|def|class|except|try)\s[^[\n]*:\s*[^\\n]#\s]+',
+     "linebreak after :"),
+    (r'class\s[^( \n]+:', "old-style class, use class foo(object)",
+     r'#.*old-style'),
+    (r'class\s[^( \n]+\(\):',
+     "class foo() creates old style object, use class foo(object)",
+     r'#.*old-style'),
+    (r'\b(%s)\(' % '|'.join(k for k in keyword.kwlist
+                            if k not in ('print', 'exec')),
+     "Python keyword is not a function"),
+    (r',]', "unneeded trailing ',' in list"),
+#    (r'class\s[A-Z][^\(]*\((?!Exception)',
+#     "don't capitalize non-exception classes"),
+#    (r'in range\(', "use xrange"),
+#    (r'^\s*print\s+', "avoid using print in core and extensions"),
+    (r'[\x80-\xff]', "non-ASCII character literal"),
+    (r'("\')\.format\(', "str.format() has no bytes counterpart, use %"),
+    (r'^\s*(%s)\s\s' % '|'.join(keyword.kwlist),
+     "gratuitous whitespace after Python keyword"),
+    (r'([\(\[][ \t]\S)|(\S[ \t][\)\]])', "gratuitous whitespace in () or []"),
+#    (r'\s\s=', "gratuitous whitespace before ="),
+    (r'[^>< ](\+=|-=|!=|<>|<=|>=|<<=|>>=|%=)\S',
+     "missing whitespace around operator"),
+    (r'[^>< ](\+=|-=|!=|<>|<=|>=|<<=|>>=|%=)\s',
+     "missing whitespace around operator"),
+    (r'\s(\+=|-=|!=|<>|<=|>=|<<=|>>=|%=)\S',
+     "missing whitespace around operator"),
+    (r'[^^+=*/!<>&| %-](\s=|=\s)[^= ]',
+     "wrong whitespace around ="),
+    (r'\([^()]*( =[^=]|[^<>!=]= )',
+     "no whitespace around = for named parameters"),
+    (r'raise Exception', "don't raise generic exceptions"),
+    (r'raise [^,(]+, (\([^\)]+\)|[^,\(\)]+)$',
+     "don't use old-style two-argument raise, use Exception(message)"),
+    (r' is\s+(not\s+)?["\'0-9-]', "object comparison with literal"),
+    (r' [=!]=\s+(True|False|None)',
+     "comparison with singleton, use 'is' or 'is not' instead"),
+    (r'^\s*(while|if) [01]:',
+     "use True/False for constant Boolean expression"),
+    (r'^\s*if False(:| +and)', 'Remove code instead of using `if False`'),
+    (r'(?:(?<!def)\s+|\()hasattr\(',
+     'hasattr(foo, bar) is broken on py2, use util.safehasattr(foo, bar) '
+     'instead', r'#.*hasattr-py3-only'),
+    (r'opener\([^)]*\).read\(',
+     "use opener.read() instead"),
+    (r'opener\([^)]*\).write\(',
+     "use opener.write() instead"),
+    (r'[\s\(](open|file)\([^)]*\)\.read\(',
+     "use util.readfile() instead"),
+    (r'[\s\(](open|file)\([^)]*\)\.write\(',
+     "use util.writefile() instead"),
+    (r'^[\s\(]*(open(er)?|file)\([^)]*\)(?!\.close\(\))',
+     "always assign an opened file to a variable, and close it afterwards"),
+    (r'[\s\(](open|file)\([^)]*\)\.(?!close\(\))',
+     "always assign an opened file to a variable, and close it afterwards"),
+    (r'(?i)descend[e]nt', "the proper spelling is descendAnt"),
+    (r'\.debug\(\_', "don't mark debug messages for translation"),
+    (r'\.strip\(\)\.split\(\)', "no need to strip before splitting"),
+    (r'^\s*except\s*:', "naked except clause", r'#.*re-raises'),
+    (r'^\s*except\s([^\(,]+|\([^\)]+\))\s*,',
+     'legacy exception syntax; use "as" instead of ","'),
+    (r':\n(    )*( ){1,3}[^ ]', "must indent 4 spaces"),
+    (r'release\(.*wlock, .*lock\)', "wrong lock release order"),
+    (r'\bdef\s+__bool__\b', "__bool__ should be __nonzero__ in Python 2"),
+    (r'os\.path\.join\(.*, *(""|\'\')\)',
+     "use pathutil.normasprefix(path) instead of os.path.join(path, '')"),
+    (r'\s0[0-7]+\b', 'legacy octal syntax; use "0o" prefix instead of "0"'),
+    # XXX only catch mutable arguments on the first line of the definition
+    (r'def.*[( ]\w+=\{\}', "don't use mutable default arguments"),
+    (r'\butil\.Abort\b', "directly use error.Abort"),
+    (r'^@(\w*\.)?cachefunc', "module-level @cachefunc is risky, please avoid"),
+    (r'^import atexit', "don't use atexit, use ui.atexit"),
+    (r'^import Queue', "don't use Queue, use pycompat.queue.Queue + "
+                       "pycompat.queue.Empty"),
+    (r'^import cStringIO', "don't use cStringIO.StringIO, use util.stringio"),
+    (r'^import urllib', "don't use urllib, use util.urlreq/util.urlerr"),
+    (r'^import SocketServer', "don't use SockerServer, use util.socketserver"),
+    (r'^import urlparse', "don't use urlparse, use util.urlreq"),
+    (r'^import xmlrpclib', "don't use xmlrpclib, use util.xmlrpclib"),
+    (r'^import cPickle', "don't use cPickle, use util.pickle"),
+    (r'^import pickle', "don't use pickle, use util.pickle"),
+    (r'^import httplib', "don't use httplib, use util.httplib"),
+    (r'^import BaseHTTPServer', "use util.httpserver instead"),
+    (r'^(from|import) mercurial\.(cext|pure|cffi)',
+     "use mercurial.policy.importmod instead"),
+    (r'\.next\(\)', "don't use .next(), use next(...)"),
+    (r'([a-z]*).revision\(\1\.node\(',
+     "don't convert rev to node before passing to revision(nodeorrev)"),
+    (r'platform\.system\(\)', "don't use platform.system(), use pycompat"),
+
+    # rules depending on implementation of repquote()
+    (r' x+[xpqo%APM][\'"]\n\s+[\'"]x',
+     'string join across lines with no space'),
+    (r'''(?x)ui\.(status|progress|write|note|warn)\(
+         [ \t\n#]*
+         (?# any strings/comments might precede a string, which
+           # contains translatable message)
+         ((['"]|\'\'\'|""")[ \npq%bAPMxno]*(['"]|\'\'\'|""")[ \t\n#]+)*
+         (?# sequence consisting of below might precede translatable message
+           # - formatting string: "% 10s", "%05d", "% -3.2f", "%*s", "%%" ...
+           # - escaped character: "\\", "\n", "\0" ...
+           # - character other than '%', 'b' as '\', and 'x' as alphabet)
+         (['"]|\'\'\'|""")
+         ((%([ n]?[PM]?([np]+|A))?x)|%%|b[bnx]|[ \nnpqAPMo])*x
+         (?# this regexp can't use [^...] style,
+           # because _preparepats forcibly adds "\n" into [^...],
+           # even though this regexp wants match it against "\n")''',
+     "missing _() in ui message (use () to hide false-positives)"),
+  ],
+  # warnings
+  [
+    # rules depending on implementation of repquote()
+    (r'(^| )pp +xxxxqq[ \n][^\n]', "add two newlines after '.. note::'"),
+  ]
+]
+
+pyfilters = [
+    (r"""(?msx)(?P<comment>\#.*?$)|
+         ((?P<quote>('''|\"\"\"|(?<!')'(?!')|(?<!")"(?!")))
+          (?P<text>(([^\\]|\\.)*?))
+          (?P=quote))""", reppython),
+]
+
+# non-filter patterns
+pynfpats = [
+    [
+    (r'pycompat\.osname\s*[=!]=\s*[\'"]nt[\'"]', "use pycompat.iswindows"),
+    (r'pycompat\.osname\s*[=!]=\s*[\'"]posix[\'"]', "use pycompat.isposix"),
+    (r'pycompat\.sysplatform\s*[!=]=\s*[\'"]darwin[\'"]',
+     "use pycompat.isdarwin"),
+    ],
+    # warnings
+    [],
+]
+
+# extension non-filter patterns
+pyextnfpats = [
+    [(r'^"""\n?[A-Z]', "don't capitalize docstring title")],
+    # warnings
+    [],
+]
+
+txtfilters = []
+
+txtpats = [
+  [
+    ('\s$', 'trailing whitespace'),
+    ('.. note::[ \n][^\n]', 'add two newlines after note::')
+  ],
+  []
+]
+
+cpats = [
+  [
+    (r'//', "don't use //-style comments"),
+    (r'\S\t', "don't use tabs except for indent"),
+    (r'(\S[ \t]+|^[ \t]+)\n', "trailing whitespace"),
+    (r'.{81}', "line too long"),
+    (r'(while|if|do|for)\(', "use space after while/if/do/for"),
+    (r'return\(', "return is not a function"),
+    (r' ;', "no space before ;"),
+    (r'[^;] \)', "no space before )"),
+    (r'[)][{]', "space between ) and {"),
+    (r'\w+\* \w+', "use int *foo, not int* foo"),
+    (r'\W\([^\)]+\) \w+', "use (int)foo, not (int) foo"),
+    (r'\w+ (\+\+|--)', "use foo++, not foo ++"),
+    (r'\w,\w', "missing whitespace after ,"),
+    (r'^[^#]\w[+/*]\w', "missing whitespace in expression"),
+    (r'\w\s=\s\s+\w', "gratuitous whitespace after ="),
+    (r'^#\s+\w', "use #foo, not # foo"),
+    (r'[^\n]\Z', "no trailing newline"),
+    (r'^\s*#import\b', "use only #include in standard C code"),
+    (r'strcpy\(', "don't use strcpy, use strlcpy or memcpy"),
+    (r'strcat\(', "don't use strcat"),
+
+    # rules depending on implementation of repquote()
+  ],
+  # warnings
+  [
+    # rules depending on implementation of repquote()
+  ]
+]
+
+cfilters = [
+    (r'(/\*)(((\*(?!/))|[^*])*)\*/', repccomment),
+    (r'''(?P<quote>(?<!")")(?P<text>([^"]|\\")+)"(?!")''', repquote),
+    (r'''(#\s*include\s+<)([^>]+)>''', repinclude),
+    (r'(\()([^)]+\))', repcallspaces),
+]
+
+inutilpats = [
+  [
+    (r'\bui\.', "don't use ui in util"),
+  ],
+  # warnings
+  []
+]
+
+inrevlogpats = [
+  [
+    (r'\brepo\.', "don't use repo in revlog"),
+  ],
+  # warnings
+  []
+]
+
+webtemplatefilters = []
+
+webtemplatepats = [
+  [],
+  [
+    (r'{desc(\|(?!websub|firstline)[^\|]*)+}',
+     'follow desc keyword with either firstline or websub'),
+  ]
+]
+
+allfilesfilters = []
+
+allfilespats = [
+  [
+    (r'(http|https)://[a-zA-Z0-9./]*selenic.com/',
+     'use mercurial-scm.org domain URL'),
+    (r'mercurial@selenic\.com',
+     'use mercurial-scm.org domain for mercurial ML address'),
+    (r'mercurial-devel@selenic\.com',
+     'use mercurial-scm.org domain for mercurial-devel ML address'),
+  ],
+  # warnings
+  [],
+]
+
+py3pats = [
+  [
+    (r'os\.environ', "use encoding.environ instead (py3)", r'#.*re-exports'),
+    (r'os\.name', "use pycompat.osname instead (py3)"),
+    (r'os\.getcwd', "use pycompat.getcwd instead (py3)"),
+    (r'os\.sep', "use pycompat.ossep instead (py3)"),
+    (r'os\.pathsep', "use pycompat.ospathsep instead (py3)"),
+    (r'os\.altsep', "use pycompat.osaltsep instead (py3)"),
+    (r'sys\.platform', "use pycompat.sysplatform instead (py3)"),
+    (r'getopt\.getopt', "use pycompat.getoptb instead (py3)"),
+    (r'os\.getenv', "use encoding.environ.get instead"),
+    (r'os\.setenv', "modifying the environ dict is not preferred"),
+    (r'(?<!pycompat\.)xrange', "use pycompat.xrange instead (py3)"),
+  ],
+  # warnings
+  [],
+]
+
+checks = [
+    ('python', r'.*\.(py|cgi)$', r'^#!.*python', pyfilters, pypats),
+    ('python', r'.*\.(py|cgi)$', r'^#!.*python', [], pynfpats),
+    ('python', r'.*hgext.*\.py$', '', [], pyextnfpats),
+    ('python 3', r'.*(hgext|mercurial)/(?!demandimport|policy|pycompat).*\.py',
+     '', pyfilters, py3pats),
+    ('test script', r'(.*/)?test-[^.~]*$', '', testfilters, testpats),
+    ('c', r'.*\.[ch]$', '', cfilters, cpats),
+    ('unified test', r'.*\.t$', '', utestfilters, utestpats),
+    ('layering violation repo in revlog', r'mercurial/revlog\.py', '',
+     pyfilters, inrevlogpats),
+    ('layering violation ui in util', r'mercurial/util\.py', '', pyfilters,
+     inutilpats),
+    ('txt', r'.*\.txt$', '', txtfilters, txtpats),
+    ('web template', r'mercurial/templates/.*\.tmpl', '',
+     webtemplatefilters, webtemplatepats),
+    ('all except for .po', r'.*(?<!\.po)$', '',
+     allfilesfilters, allfilespats),
+]
+
+def _preparepats():
+    for c in checks:
+        failandwarn = c[-1]
+        for pats in failandwarn:
+            for i, pseq in enumerate(pats):
+                # fix-up regexes for multi-line searches
+                p = pseq[0]
+                # \s doesn't match \n (done in two steps)
+                # first, we replace \s that appears in a set already
+                p = re.sub(r'\[\\s', r'[ \\t', p)
+                # now we replace other \s instances.
+                p = re.sub(r'(?<!(\\|\[))\\s', r'[ \\t]', p)
+                # [^...] doesn't match newline
+                p = re.sub(r'(?<!\\)\[\^', r'[^\\n', p)
+
+                pats[i] = (re.compile(p, re.MULTILINE),) + pseq[1:]
+        filters = c[3]
+        for i, flt in enumerate(filters):
+            filters[i] = re.compile(flt[0]), flt[1]
+
+class norepeatlogger(object):
+    def __init__(self):
+        self._lastseen = None
+
+    def log(self, fname, lineno, line, msg, blame):
+        """print error related a to given line of a given file.
+
+        The faulty line will also be printed but only once in the case
+        of multiple errors.
+
+        :fname: filename
+        :lineno: line number
+        :line: actual content of the line
+        :msg: error message
+        """
+        msgid = fname, lineno, line
+        if msgid != self._lastseen:
+            if blame:
+                print("%s:%d (%s):" % (fname, lineno, blame))
+            else:
+                print("%s:%d:" % (fname, lineno))
+            print(" > %s" % line)
+            self._lastseen = msgid
+        print(" " + msg)
+
+_defaultlogger = norepeatlogger()
+
+def getblame(f):
+    lines = []
+    for l in os.popen('hg annotate -un %s' % f):
+        start, line = l.split(':', 1)
+        user, rev = start.split()
+        lines.append((line[1:-1], user, rev))
+    return lines
+
+def checkfile(f, logfunc=_defaultlogger.log, maxerr=None, warnings=False,
+              blame=False, debug=False, lineno=True):
+    """checks style and portability of a given file
+
+    :f: filepath
+    :logfunc: function used to report error
+              logfunc(filename, linenumber, linecontent, errormessage)
+    :maxerr: number of error to display before aborting.
+             Set to false (default) to report all errors
+
+    return True if no error is found, False otherwise.
+    """
+    blamecache = None
+    result = True
+
+    try:
+        with opentext(f) as fp:
+            try:
+                pre = post = fp.read()
+            except UnicodeDecodeError as e:
+                print("%s while reading %s" % (e, f))
+                return result
+    except IOError as e:
+        print("Skipping %s, %s" % (f, str(e).split(':', 1)[0]))
+        return result
+
+    for name, match, magic, filters, pats in checks:
+        post = pre # discard filtering result of previous check
+        if debug:
+            print(name, f)
+        fc = 0
+        if not (re.match(match, f) or (magic and re.search(magic, pre))):
+            if debug:
+                print("Skipping %s for %s it doesn't match %s" % (
+                       name, match, f))
+            continue
+        if "no-" "check-code" in pre:
+            # If you're looking at this line, it's because a file has:
+            # no- check- code
+            # but the reason to output skipping is to make life for
+            # tests easier. So, instead of writing it with a normal
+            # spelling, we write it with the expected spelling from
+            # tests/test-check-code.t
+            print("Skipping %s it has no-che?k-code (glob)" % f)
+            return "Skip" # skip checking this file
+        for p, r in filters:
+            post = re.sub(p, r, post)
+        nerrs = len(pats[0]) # nerr elements are errors
+        if warnings:
+            pats = pats[0] + pats[1]
+        else:
+            pats = pats[0]
+        # print post # uncomment to show filtered version
+
+        if debug:
+            print("Checking %s for %s" % (name, f))
+
+        prelines = None
+        errors = []
+        for i, pat in enumerate(pats):
+            if len(pat) == 3:
+                p, msg, ignore = pat
+            else:
+                p, msg = pat
+                ignore = None
+            if i >= nerrs:
+                msg = "warning: " + msg
+
+            pos = 0
+            n = 0
+            for m in p.finditer(post):
+                if prelines is None:
+                    prelines = pre.splitlines()
+                    postlines = post.splitlines(True)
+
+                start = m.start()
+                while n < len(postlines):
+                    step = len(postlines[n])
+                    if pos + step > start:
+                        break
+                    pos += step
+                    n += 1
+                l = prelines[n]
+
+                if ignore and re.search(ignore, l, re.MULTILINE):
+                    if debug:
+                        print("Skipping %s for %s:%s (ignore pattern)" % (
+                            name, f, n))
+                    continue
+                bd = ""
+                if blame:
+                    bd = 'working directory'
+                    if not blamecache:
+                        blamecache = getblame(f)
+                    if n < len(blamecache):
+                        bl, bu, br = blamecache[n]
+                        if bl == l:
+                            bd = '%s@%s' % (bu, br)
+
+                errors.append((f, lineno and n + 1, l, msg, bd))
+                result = False
+
+        errors.sort()
+        for e in errors:
+            logfunc(*e)
+            fc += 1
+            if maxerr and fc >= maxerr:
+                print(" (too many errors, giving up)")
+                break
+
+    return result
+
+def main():
+    parser = optparse.OptionParser("%prog [options] [files | -]")
+    parser.add_option("-w", "--warnings", action="store_true",
+                      help="include warning-level checks")
+    parser.add_option("-p", "--per-file", type="int",
+                      help="max warnings per file")
+    parser.add_option("-b", "--blame", action="store_true",
+                      help="use annotate to generate blame info")
+    parser.add_option("", "--debug", action="store_true",
+                      help="show debug information")
+    parser.add_option("", "--nolineno", action="store_false",
+                      dest='lineno', help="don't show line numbers")
+
+    parser.set_defaults(per_file=15, warnings=False, blame=False, debug=False,
+                        lineno=True)
+    (options, args) = parser.parse_args()
+
+    if len(args) == 0:
+        check = glob.glob("*")
+    elif args == ['-']:
+        # read file list from stdin
+        check = sys.stdin.read().splitlines()
+    else:
+        check = args
+
+    _preparepats()
+
+    ret = 0
+    for f in check:
+        if not checkfile(f, maxerr=options.per_file, warnings=options.warnings,
+                         blame=options.blame, debug=options.debug,
+                         lineno=options.lineno):
+            ret = 1
+    return ret
+
+if __name__ == "__main__":
+    sys.exit(main())

contrib/check-commit

@@ -0,0 +1,111 b''
+#!/usr/bin/env python
+#
+# Copyright 2014 Matt Mackall <[e-mail]>
+#
+# A tool/hook to run basic sanity checks on commits/patches for
+# submission to Mercurial. Install by adding the following to your
+# .hg/hgrc:
+#
+# [hooks]
+# pretxncommit = contrib/check-commit
+#
+# The hook can be temporarily bypassed with:
+#
+# $ BYPASS= hg commit
+#
+# See also: https://mercurial-scm.org/wiki/ContributingChanges
+
+from __future__ import absolute_import, print_function
+
+import os
+import re
+import sys
+
+commitheader = r"^(?:# [^\n]*\n)*"
+afterheader = commitheader + r"(?!#)"
+beforepatch = afterheader + r"(?!\n(?!@@))"
+
+errors = [
+    (beforepatch + r".*[(]bc[)]", "(BC) needs to be uppercase"),
+    (beforepatch + r".*[(]issue \d\d\d",
+     "no space allowed between issue and number"),
+    (beforepatch + r".*[(]bug(\d|\s)", "use (issueDDDD) instead of bug"),
+    (commitheader + r"# User [^@\n]+\n", "username is not an email address"),
+    (commitheader + r"(?!merge with )[^#]\S+[^:] ",
+     "summary line doesn't start with 'topic: '"),
+    (afterheader + r"[A-Z][a-z]\S+", "don't capitalize summary lines"),
+    (afterheader + r"[^\n]*: *[A-Z][a-z]\S+", "don't capitalize summary lines"),
+    (afterheader + r"\S*[^A-Za-z0-9-_]\S*: ",
+     "summary keyword should be most user-relevant one-word command or topic"),
+    (afterheader + r".*\.\s*\n", "don't add trailing period on summary line"),
+    (afterheader + r".{79,}", "summary line too long (limit is 78)"),
+    (r"\n\+\n( |\+)\n", "adds double empty line"),
+    (r"\n \n\+\n", "adds double empty line"),
+    # Forbid "_" in function name.
+    #
+    # We skip the check for cffi related functions. They use names mapping the
+    # name of the C function. C function names may contain "_".
+    (r"\n\+[ \t]+def (?!cffi)[a-z]+_[a-z]",
+     "adds a function with foo_bar naming"),
+]
+
+word = re.compile('\S')
+def nonempty(first, second):
+    if word.search(first):
+        return first
+    return second
+
+def checkcommit(commit, node=None):
+    exitcode = 0
+    printed = node is None
+    hits = []
+    signtag = (afterheader +
+          r'Added (tag [^ ]+|signature) for changeset [a-f0-9]{12}')
+    if re.search(signtag, commit):
+        return 0
+    for exp, msg in errors:
+        for m in re.finditer(exp, commit):
+            end = m.end()
+            trailing = re.search(r'(\\n)+$', exp)
+            if trailing:
+                end -= len(trailing.group()) / 2
+            hits.append((end, exp, msg))
+    if hits:
+        hits.sort()
+        pos = 0
+        last = ''
+        for n, l in enumerate(commit.splitlines(True)):
+            pos += len(l)
+            while len(hits):
+                end, exp, msg = hits[0]
+                if pos < end:
+                    break
+                if not printed:
+                    printed = True
+                    print("node: %s" % node)
+                print("%d: %s" % (n, msg))
+                print(" %s" % nonempty(l, last)[:-1])
+                if "BYPASS" not in os.environ:
+                    exitcode = 1
+                del hits[0]
+            last = nonempty(l, last)
+
+    return exitcode
+
+def readcommit(node):
+    return os.popen("hg export %s" % node).read()
+
+if __name__ == "__main__":
+    exitcode = 0
+    node = os.environ.get("HG_NODE")
+
+    if node:
+        commit = readcommit(node)
+        exitcode = checkcommit(commit)
+    elif sys.argv[1:]:
+        for node in sys.argv[1:]:
+            exitcode |= checkcommit(readcommit(node), node)
+    else:
+        commit = sys.stdin.read()
+        exitcode = checkcommit(commit)
+    sys.exit(exitcode)

contrib/check-config.py

@@ -0,0 +1,142 b''
+#!/usr/bin/env python
+#
+# check-config - a config flag documentation checker for Mercurial
+#
+# Copyright 2015 Matt Mackall <[e-mail]>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+from __future__ import absolute_import, print_function
+import re
+import sys
+
+foundopts = {}
+documented = {}
+allowinconsistent = set()
+
+configre = re.compile(br'''
+    # Function call
+    ui\.config(?P<ctype>|int|bool|list)\(
+        # First argument.
+        ['"](?P<section>\S+)['"],\s*
+        # Second argument
+        ['"](?P<option>\S+)['"](,\s+
+        (?:default=)?(?P<default>\S+?))?
+    \)''', re.VERBOSE | re.MULTILINE)
+
+configwithre = re.compile(b'''
+    ui\.config(?P<ctype>with)\(
+        # First argument is callback function. This doesn't parse robustly
+        # if it is e.g. a function call.
+        [^,]+,\s*
+        ['"](?P<section>\S+)['"],\s*
+        ['"](?P<option>\S+)['"](,\s+
+        (?:default=)?(?P<default>\S+?))?
+    \)''', re.VERBOSE | re.MULTILINE)
+
+configpartialre = (br"""ui\.config""")
+
+ignorere = re.compile(br'''
+    \#\s(?P<reason>internal|experimental|deprecated|developer|inconsistent)\s
+    config:\s(?P<config>\S+\.\S+)$
+    ''', re.VERBOSE | re.MULTILINE)
+
+def main(args):
+    for f in args:
+        sect = b''
+        prevname = b''
+        confsect = b''
+        carryover = b''
+        linenum = 0
+        for l in open(f, 'rb'):
+            linenum += 1
+
+            # check topic-like bits
+            m = re.match(b'\s*``(\S+)``', l)
+            if m:
+                prevname = m.group(1)
+            if re.match(b'^\s*-+$', l):
+                sect = prevname
+                prevname = b''
+
+            if sect and prevname:
+                name = sect + b'.' + prevname
+                documented[name] = 1
+
+            # check docstring bits
+            m = re.match(br'^\s+\[(\S+)\]', l)
+            if m:
+                confsect = m.group(1)
+                continue
+            m = re.match(br'^\s+(?:#\s*)?(\S+) = ', l)
+            if m:
+                name = confsect + b'.' + m.group(1)
+                documented[name] = 1
+
+            # like the bugzilla extension
+            m = re.match(br'^\s*(\S+\.\S+)$', l)
+            if m:
+                documented[m.group(1)] = 1
+
+            # like convert
+            m = re.match(br'^\s*:(\S+\.\S+):\s+', l)
+            if m:
+                documented[m.group(1)] = 1
+
+            # quoted in help or docstrings
+            m = re.match(br'.*?``(\S+\.\S+)``', l)
+            if m:
+                documented[m.group(1)] = 1
+
+            # look for ignore markers
+            m = ignorere.search(l)
+            if m:
+                if m.group('reason') == 'inconsistent':
+                    allowinconsistent.add(m.group('config'))
+                else:
+                    documented[m.group('config')] = 1
+
+            # look for code-like bits
+            line = carryover + l
+            m = configre.search(line) or configwithre.search(line)
+            if m:
+                ctype = m.group('ctype')
+                if not ctype:
+                    ctype = 'str'
+                name = m.group('section') + "." + m.group('option')
+                default = m.group('default')
+                if default in (None, 'False', 'None', '0', '[]', '""', "''"):
+                    default = ''
+                if re.match(b'[a-z.]+$', default):
+                    default = '<variable>'
+                if (name in foundopts and (ctype, default) != foundopts[name]
+                    and name not in allowinconsistent):
+                    print(l.rstrip())
+                    print("conflict on %s: %r != %r" % (name, (ctype, default),
+                                                        foundopts[name]))
+                    print("at %s:%d:" % (f, linenum))
+                foundopts[name] = (ctype, default)
+                carryover = ''
+            else:
+                m = re.search(configpartialre, line)
+                if m:
+                    carryover = line
+                else:
+                    carryover = ''
+
+    for name in sorted(foundopts):
+        if name not in documented:
+            if not (name.startswith("devel.") or
+                    name.startswith("experimental.") or
+                    name.startswith("debug.")):
+                ctype, default = foundopts[name]
+                if default:
+                    default = ' [%s]' % default
+                print("undocumented: %s (%s)%s" % (name, ctype, default))
+
+if __name__ == "__main__":
+    if len(sys.argv) > 1:
+        sys.exit(main(sys.argv[1:]))
+    else:
+        sys.exit(main([l.rstrip() for l in sys.stdin]))

contrib/check-py3-compat.py

@@ -0,0 +1,96 b''
+#!/usr/bin/env python
+#
+# check-py3-compat - check Python 3 compatibility of Mercurial files
+#
+# Copyright 2015 Gregory Szorc <[e-mail]>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+from __future__ import absolute_import, print_function
+
+import ast
+import importlib
+import os
+import sys
+import traceback
+
+def check_compat_py2(f):
+    """Check Python 3 compatibility for a file with Python 2"""
+    with open(f, 'rb') as fh:
+        content = fh.read()
+    root = ast.parse(content)
+
+    # Ignore empty files.
+    if not root.body:
+        return
+
+    futures = set()
+    haveprint = False
+    for node in ast.walk(root):
+        if isinstance(node, ast.ImportFrom):
+            if node.module == '__future__':
+                futures |= set(n.name for n in node.names)
+        elif isinstance(node, ast.Print):
+            haveprint = True
+
+    if 'absolute_import' not in futures:
+        print('%s not using absolute_import' % f)
+    if haveprint and 'print_function' not in futures:
+        print('%s requires print_function' % f)
+
+def check_compat_py3(f):
+    """Check Python 3 compatibility of a file with Python 3."""
+    with open(f, 'rb') as fh:
+        content = fh.read()
+
+    try:
+        ast.parse(content)
+    except SyntaxError as e:
+        print('%s: invalid syntax: %s' % (f, e))
+        return
+
+    # Try to import the module.
+    # For now we only support modules in packages because figuring out module
+    # paths for things not in a package can be confusing.
+    if (f.startswith(('hgdemandimport/', 'hgext/', 'mercurial/'))
+        and not f.endswith('__init__.py')):
+        assert f.endswith('.py')
+        name = f.replace('/', '.')[:-3]
+        try:
+            importlib.import_module(name)
+        except Exception as e:
+            exc_type, exc_value, tb = sys.exc_info()
+            # We walk the stack and ignore frames from our custom importer,
+            # import mechanisms, and stdlib modules. This kinda/sorta
+            # emulates CPython behavior in import.c while also attempting
+            # to pin blame on a Mercurial file.
+            for frame in reversed(traceback.extract_tb(tb)):
+                if frame.name == '_call_with_frames_removed':
+                    continue
+                if 'importlib' in frame.filename:
+                    continue
+                if 'mercurial/__init__.py' in frame.filename:
+                    continue
+                if frame.filename.startswith(sys.prefix):
+                    continue
+                break
+
+            if frame.filename:
+                filename = os.path.basename(frame.filename)
+                print('%s: error importing: <%s> %s (error at %s:%d)' % (
+                      f, type(e).__name__, e, filename, frame.lineno))
+            else:
+                print('%s: error importing module: <%s> %s (line %d)' % (
+                      f, type(e).__name__, e, frame.lineno))
+
+if __name__ == '__main__':
+    if sys.version_info[0] == 2:
+        fn = check_compat_py2
+    else:
+        fn = check_compat_py3
+
+    for f in sys.argv[1:]:
+        fn(f)
+
+    sys.exit(0)

contrib/chg/Makefile

@@ -0,0 +1,40 b''
+TARGET = chg
+SRCS = chg.c hgclient.c procutil.c util.c
+OBJS = $(SRCS:.c=.o)
+
+CFLAGS ?= -O2 -Wall -Wextra -pedantic -g
+CPPFLAGS ?= -D_FORTIFY_SOURCE=2 -D_GNU_SOURCE
+override CFLAGS += -std=gnu99
+ifdef HGPATH
+override CPPFLAGS += -DHGPATH=\"$(HGPATH)\"
+endif
+
+DESTDIR =
+PREFIX = /usr/local
+MANDIR = $(PREFIX)/share/man/man1
+
+.PHONY: all
+all: $(TARGET)
+
+$(TARGET): $(OBJS)
+	$(CC) $(LDFLAGS) -o $@ $(OBJS)
+
+chg.o: hgclient.h procutil.h util.h
+hgclient.o: hgclient.h procutil.h util.h
+procutil.o: procutil.h util.h
+util.o: util.h
+
+.PHONY: install
+install: $(TARGET)
+	install -d "$(DESTDIR)$(PREFIX)"/bin
+	install -m 755 "$(TARGET)" "$(DESTDIR)$(PREFIX)"/bin
+	install -d "$(DESTDIR)$(MANDIR)"
+	install -m 644 chg.1 "$(DESTDIR)$(MANDIR)"
+
+.PHONY: clean
+clean:
+	$(RM) $(OBJS)
+
+.PHONY: distclean
+distclean:
+	$(RM) $(OBJS) $(TARGET)

contrib/chg/README

@@ -0,0 +1,32 b''
+cHg
+===
+
+A fast client for Mercurial command server running on Unix.
+
+Install:
+
+ $ make
+ $ make install
+
+Usage:
+
+ $ chg help                 # show help of Mercurial
+ $ alias hg=chg             # replace hg command
+ $ chg --kill-chg-daemon    # terminate background server
+
+Environment variables:
+
+Although cHg tries to update environment variables, some of them cannot be
+changed after spawning the server. The following variables are specially
+handled:
+
+ * configuration files are reloaded automatically by default.
+ * CHGHG or HG specifies the path to the hg executable spawned as the
+   background command server.
+
+The following variables are available for testing:
+
+ * CHGDEBUG enables debug messages.
+ * CHGSOCKNAME specifies the socket path of the background cmdserver.
+ * CHGTIMEOUT specifies how many seconds chg will wait before giving up
+   connecting to a cmdserver. If it is 0, chg will wait forever. Default: 60

contrib/chg/chg.1

@@ -0,0 +1,41 b''
+.\"                                      Hey, EMACS: -*- nroff -*-
+.\" First parameter, NAME, should be all caps
+.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
+.\" other parameters are allowed: see man(7), man(1)
+.TH CHG 1 "March 3, 2013"
+.\" Please adjust this date whenever revising the manpage.
+.\"
+.\" Some roff macros, for reference:
+.\" .nh        disable hyphenation
+.\" .hy        enable hyphenation
+.\" .ad l      left justify
+.\" .ad b      justify to both left and right margins
+.\" .nf        disable filling
+.\" .fi        enable filling
+.\" .br        insert line break
+.\" .sp <n>    insert n+1 empty lines
+.\" for manpage-specific macros, see man(7)
+.SH NAME
+chg \- a fast client for Mercurial command server
+.SH SYNOPSIS
+.B chg
+.IR command " [" options "] [" arguments "]..."
+.br
+.SH DESCRIPTION
+The
+.B chg
+command is the wrapper for
+.B hg
+command.
+It uses the Mercurial command server to reduce start-up overhead.
+.SH OPTIONS
+This program accepts the same command line syntax as the
+.B hg
+command. Additionally it accepts the following options.
+.TP
+.B \-\-kill\-chg\-daemon
+Terminate the background command servers.
+.SH SEE ALSO
+.BR hg (1),
+.SH AUTHOR
+Written by Yuya Nishihara <[e-mail]>.

contrib/chg/chg.c

@@ -0,0 +1,456 b''
+/*
+ * A fast client for Mercurial command server
+ *
+ * Copyright (c) 2011 Yuya Nishihara <[e-mail]>
+ *
+ * This software may be used and distributed according to the terms of the
+ * GNU General Public License version 2 or any later version.
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "hgclient.h"
+#include "procutil.h"
+#include "util.h"
+
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
+struct cmdserveropts {
+	char sockname[PATH_MAX];
+	char initsockname[PATH_MAX];
+	char redirectsockname[PATH_MAX];
+	size_t argsize;
+	const char **args;
+};
+
+static void initcmdserveropts(struct cmdserveropts *opts)
+{
+	memset(opts, 0, sizeof(struct cmdserveropts));
+}
+
+static void freecmdserveropts(struct cmdserveropts *opts)
+{
+	free(opts->args);
+	opts->args = NULL;
+	opts->argsize = 0;
+}
+
+/*
+ * Test if an argument is a sensitive flag that should be passed to the server.
+ * Return 0 if not, otherwise the number of arguments starting from the current
+ * one that should be passed to the server.
+ */
+static size_t testsensitiveflag(const char *arg)
+{
+	static const struct {
+		const char *name;
+		size_t narg;
+	} flags[] = {
+	    {"--config", 1},     {"--cwd", 1},       {"--repo", 1},
+	    {"--repository", 1}, {"--traceback", 0}, {"-R", 1},
+	};
+	size_t i;
+	for (i = 0; i < sizeof(flags) / sizeof(flags[0]); ++i) {
+		size_t len = strlen(flags[i].name);
+		size_t narg = flags[i].narg;
+		if (memcmp(arg, flags[i].name, len) == 0) {
+			if (arg[len] == '\0') {
+				/* --flag (value) */
+				return narg + 1;
+			} else if (arg[len] == '=' && narg > 0) {
+				/* --flag=value */
+				return 1;
+			} else if (flags[i].name[1] != '-') {
+				/* short flag */
+				return 1;
+			}
+		}
+	}
+	return 0;
+}
+
+/*
+ * Parse argv[] and put sensitive flags to opts->args
+ */
+static void setcmdserverargs(struct cmdserveropts *opts, int argc,
+                             const char *argv[])
+{
+	size_t i, step;
+	opts->argsize = 0;
+	for (i = 0, step = 1; i < (size_t)argc; i += step, step = 1) {
+		if (!argv[i])
+			continue; /* pass clang-analyse */
+		if (strcmp(argv[i], "--") == 0)
+			break;
+		size_t n = testsensitiveflag(argv[i]);
+		if (n == 0 || i + n > (size_t)argc)
+			continue;
+		opts->args =
+		    reallocx(opts->args, (n + opts->argsize) * sizeof(char *));
+		memcpy(opts->args + opts->argsize, argv + i,
+		       sizeof(char *) * n);
+		opts->argsize += n;
+		step = n;
+	}
+}
+
+static void preparesockdir(const char *sockdir)
+{
+	int r;
+	r = mkdir(sockdir, 0700);
+	if (r < 0 && errno != EEXIST)
+		abortmsgerrno("cannot create sockdir %s", sockdir);
+
+	struct stat st;
+	r = lstat(sockdir, &st);
+	if (r < 0)
+		abortmsgerrno("cannot stat %s", sockdir);
+	if (!S_ISDIR(st.st_mode))
+		abortmsg("cannot create sockdir %s (file exists)", sockdir);
+	if (st.st_uid != geteuid() || st.st_mode & 0077)
+		abortmsg("insecure sockdir %s", sockdir);
+}
+
+/*
+ * Check if a socket directory exists and is only owned by the current user.
+ * Return 1 if so, 0 if not. This is used to check if XDG_RUNTIME_DIR can be
+ * used or not. According to the specification [1], XDG_RUNTIME_DIR should be
+ * ignored if the directory is not owned by the user with mode 0700.
+ * [1]: https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
+ */
+static int checkruntimedir(const char *sockdir)
+{
+	struct stat st;
+	int r = lstat(sockdir, &st);
+	if (r < 0) /* ex. does not exist */
+		return 0;
+	if (!S_ISDIR(st.st_mode)) /* ex. is a file, not a directory */
+		return 0;
+	return st.st_uid == geteuid() && (st.st_mode & 0777) == 0700;
+}
+
+static void getdefaultsockdir(char sockdir[], size_t size)
+{
+	/* by default, put socket file in secure directory
+	 * (${XDG_RUNTIME_DIR}/chg, or /${TMPDIR:-tmp}/chg$UID)
+	 * (permission of socket file may be ignored on some Unices) */
+	const char *runtimedir = getenv("XDG_RUNTIME_DIR");
+	int r;
+	if (runtimedir && checkruntimedir(runtimedir)) {
+		r = snprintf(sockdir, size, "%s/chg", runtimedir);
+	} else {
+		const char *tmpdir = getenv("TMPDIR");
+		if (!tmpdir)
+			tmpdir = "/tmp";
+		r = snprintf(sockdir, size, "%s/chg%d", tmpdir, geteuid());
+	}
+	if (r < 0 || (size_t)r >= size)
+		abortmsg("too long TMPDIR (r = %d)", r);
+}
+
+static void setcmdserveropts(struct cmdserveropts *opts)
+{
+	int r;
+	char sockdir[PATH_MAX];
+	const char *envsockname = getenv("CHGSOCKNAME");
+	if (!envsockname) {
+		getdefaultsockdir(sockdir, sizeof(sockdir));
+		preparesockdir(sockdir);
+	}
+
+	const char *basename = (envsockname) ? envsockname : sockdir;
+	const char *sockfmt = (envsockname) ? "%s" : "%s/server";
+	r = snprintf(opts->sockname, sizeof(opts->sockname), sockfmt, basename);
+	if (r < 0 || (size_t)r >= sizeof(opts->sockname))
+		abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r);
+	r = snprintf(opts->initsockname, sizeof(opts->initsockname), "%s.%u",
+	             opts->sockname, (unsigned)getpid());
+	if (r < 0 || (size_t)r >= sizeof(opts->initsockname))
+		abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r);
+}
+
+static const char *gethgcmd(void)
+{
+	static const char *hgcmd = NULL;
+	if (!hgcmd) {
+		hgcmd = getenv("CHGHG");
+		if (!hgcmd || hgcmd[0] == '\0')
+			hgcmd = getenv("HG");
+		if (!hgcmd || hgcmd[0] == '\0')
+#ifdef HGPATH
+			hgcmd = (HGPATH);
+#else
+			hgcmd = "hg";
+#endif
+	}
+	return hgcmd;
+}
+
+static void execcmdserver(const struct cmdserveropts *opts)
+{
+	const char *hgcmd = gethgcmd();
+
+	const char *baseargv[] = {
+	    hgcmd,
+	    "serve",
+	    "--cmdserver",
+	    "chgunix",
+	    "--address",
+	    opts->initsockname,
+	    "--daemon-postexec",
+	    "chdir:/",
+	};
+	size_t baseargvsize = sizeof(baseargv) / sizeof(baseargv[0]);
+	size_t argsize = baseargvsize + opts->argsize + 1;
+
+	const char **argv = mallocx(sizeof(char *) * argsize);
+	memcpy(argv, baseargv, sizeof(baseargv));
+	if (opts->args) {
+		size_t size = sizeof(char *) * opts->argsize;
+		memcpy(argv + baseargvsize, opts->args, size);
+	}
+	argv[argsize - 1] = NULL;
+
+	if (putenv("CHGINTERNALMARK=") != 0)
+		abortmsgerrno("failed to putenv");
+	if (execvp(hgcmd, (char **)argv) < 0)
+		abortmsgerrno("failed to exec cmdserver");
+	free(argv);
+}
+
+/* Retry until we can connect to the server. Give up after some time. */
+static hgclient_t *retryconnectcmdserver(struct cmdserveropts *opts, pid_t pid)
+{
+	static const struct timespec sleepreq = {0, 10 * 1000000};
+	int pst = 0;
+
+	debugmsg("try connect to %s repeatedly", opts->initsockname);
+
+	unsigned int timeoutsec = 60; /* default: 60 seconds */
+	const char *timeoutenv = getenv("CHGTIMEOUT");
+	if (timeoutenv)
+		sscanf(timeoutenv, "%u", &timeoutsec);
+
+	for (unsigned int i = 0; !timeoutsec || i < timeoutsec * 100; i++) {
+		hgclient_t *hgc = hgc_open(opts->initsockname);
+		if (hgc) {
+			debugmsg("rename %s to %s", opts->initsockname,
+			         opts->sockname);
+			int r = rename(opts->initsockname, opts->sockname);
+			if (r != 0)
+				abortmsgerrno("cannot rename");
+			return hgc;
+		}
+
+		if (pid > 0) {
+			/* collect zombie if child process fails to start */
+			int r = waitpid(pid, &pst, WNOHANG);
+			if (r != 0)
+				goto cleanup;
+		}
+
+		nanosleep(&sleepreq, NULL);
+	}
+
+	abortmsg("timed out waiting for cmdserver %s", opts->initsockname);
+	return NULL;
+
+cleanup:
+	if (WIFEXITED(pst)) {
+		if (WEXITSTATUS(pst) == 0)
+			abortmsg("could not connect to cmdserver "
+			         "(exited with status 0)");
+		debugmsg("cmdserver exited with status %d", WEXITSTATUS(pst));
+		exit(WEXITSTATUS(pst));
+	} else if (WIFSIGNALED(pst)) {
+		abortmsg("cmdserver killed by signal %d", WTERMSIG(pst));
+	} else {
+		abortmsg("error while waiting for cmdserver");
+	}
+	return NULL;
+}
+
+/* Connect to a cmdserver. Will start a new server on demand. */
+static hgclient_t *connectcmdserver(struct cmdserveropts *opts)
+{
+	const char *sockname =
+	    opts->redirectsockname[0] ? opts->redirectsockname : opts->sockname;
+	debugmsg("try connect to %s", sockname);
+	hgclient_t *hgc = hgc_open(sockname);
+	if (hgc)
+		return hgc;
+
+	/* prevent us from being connected to an outdated server: we were
+	 * told by a server to redirect to opts->redirectsockname and that
+	 * address does not work. we do not want to connect to the server
+	 * again because it will probably tell us the same thing. */
+	if (sockname == opts->redirectsockname)
+		unlink(opts->sockname);
+
+	debugmsg("start cmdserver at %s", opts->initsockname);
+
+	pid_t pid = fork();
+	if (pid < 0)
+		abortmsg("failed to fork cmdserver process");
+	if (pid == 0) {
+		execcmdserver(opts);
+	} else {
+		hgc = retryconnectcmdserver(opts, pid);
+	}
+
+	return hgc;
+}
+
+static void killcmdserver(const struct cmdserveropts *opts)
+{
+	/* resolve config hash */
+	char *resolvedpath = realpath(opts->sockname, NULL);
+	if (resolvedpath) {
+		unlink(resolvedpath);
+		free(resolvedpath);
+	}
+}
+
+/* Run instructions sent from the server like unlink and set redirect path
+ * Return 1 if reconnect is needed, otherwise 0 */
+static int runinstructions(struct cmdserveropts *opts, const char **insts)
+{
+	int needreconnect = 0;
+	if (!insts)
+		return needreconnect;
+
+	assert(insts);
+	opts->redirectsockname[0] = '\0';
+	const char **pinst;
+	for (pinst = insts; *pinst; pinst++) {
+		debugmsg("instruction: %s", *pinst);
+		if (strncmp(*pinst, "unlink ", 7) == 0) {
+			unlink(*pinst + 7);
+		} else if (strncmp(*pinst, "redirect ", 9) == 0) {
+			int r = snprintf(opts->redirectsockname,
+			                 sizeof(opts->redirectsockname), "%s",
+			                 *pinst + 9);
+			if (r < 0 || r >= (int)sizeof(opts->redirectsockname))
+				abortmsg("redirect path is too long (%d)", r);
+			needreconnect = 1;
+		} else if (strncmp(*pinst, "exit ", 5) == 0) {
+			int n = 0;
+			if (sscanf(*pinst + 5, "%d", &n) != 1)
+				abortmsg("cannot read the exit code");
+			exit(n);
+		} else if (strcmp(*pinst, "reconnect") == 0) {
+			needreconnect = 1;
+		} else {
+			abortmsg("unknown instruction: %s", *pinst);
+		}
+	}
+	return needreconnect;
+}
+
+/*
+ * Test whether the command is unsupported or not. This is not designed to
+ * cover all cases. But it's fast, does not depend on the server and does
+ * not return false positives.
+ */
+static int isunsupported(int argc, const char *argv[])
+{
+	enum { SERVE = 1,
+	       DAEMON = 2,
+	       SERVEDAEMON = SERVE | DAEMON,
+	};
+	unsigned int state = 0;
+	int i;
+	for (i = 0; i < argc; ++i) {
+		if (strcmp(argv[i], "--") == 0)
+			break;
+		if (i == 0 && strcmp("serve", argv[i]) == 0)
+			state |= SERVE;
+		else if (strcmp("-d", argv[i]) == 0 ||
+		         strcmp("--daemon", argv[i]) == 0)
+			state |= DAEMON;
+	}
+	return (state & SERVEDAEMON) == SERVEDAEMON;
+}
+
+static void execoriginalhg(const char *argv[])
+{
+	debugmsg("execute original hg");
+	if (execvp(gethgcmd(), (char **)argv) < 0)
+		abortmsgerrno("failed to exec original hg");
+}
+
+int main(int argc, const char *argv[], const char *envp[])
+{
+	if (getenv("CHGDEBUG"))
+		enabledebugmsg();
+
+	if (!getenv("HGPLAIN") && isatty(fileno(stderr)))
+		enablecolor();
+
+	if (getenv("CHGINTERNALMARK"))
+		abortmsg("chg started by chg detected.\n"
+		         "Please make sure ${HG:-hg} is not a symlink or "
+		         "wrapper to chg. Alternatively, set $CHGHG to the "
+		         "path of real hg.");
+
+	if (isunsupported(argc - 1, argv + 1))
+		execoriginalhg(argv);
+
+	struct cmdserveropts opts;
+	initcmdserveropts(&opts);
+	setcmdserveropts(&opts);
+	setcmdserverargs(&opts, argc, argv);
+
+	if (argc == 2) {
+		if (strcmp(argv[1], "--kill-chg-daemon") == 0) {
+			killcmdserver(&opts);
+			return 0;
+		}
+	}
+
+	hgclient_t *hgc;
+	size_t retry = 0;
+	while (1) {
+		hgc = connectcmdserver(&opts);
+		if (!hgc)
+			abortmsg("cannot open hg client");
+		hgc_setenv(hgc, envp);
+		const char **insts = hgc_validate(hgc, argv + 1, argc - 1);
+		int needreconnect = runinstructions(&opts, insts);
+		free(insts);
+		if (!needreconnect)
+			break;
+		hgc_close(hgc);
+		if (++retry > 10)
+			abortmsg("too many redirections.\n"
+			         "Please make sure %s is not a wrapper which "
+			         "changes sensitive environment variables "
+			         "before executing hg. If you have to use a "
+			         "wrapper, wrap chg instead of hg.",
+			         gethgcmd());
+	}
+
+	setupsignalhandler(hgc_peerpid(hgc), hgc_peerpgid(hgc));
+	atexit(waitpager);
+	int exitcode = hgc_runcommand(hgc, argv + 1, argc - 1);
+	restoresignalhandler();
+	hgc_close(hgc);
+	freecmdserveropts(&opts);
+
+	return exitcode;
+}

contrib/chg/hgclient.c

@@ -0,0 +1,619 b''
+/*
+ * A command server client that uses Unix domain socket
+ *
+ * Copyright (c) 2011 Yuya Nishihara <[e-mail]>
+ *
+ * This software may be used and distributed according to the terms of the
+ * GNU General Public License version 2 or any later version.
+ */
+
+#include <arpa/inet.h> /* for ntohl(), htonl() */
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+#include "hgclient.h"
+#include "procutil.h"
+#include "util.h"
+
+enum { CAP_GETENCODING = 0x0001,
+       CAP_RUNCOMMAND = 0x0002,
+       /* cHg extension: */
+       CAP_ATTACHIO = 0x0100,
+       CAP_CHDIR = 0x0200,
+       CAP_SETENV = 0x0800,
+       CAP_SETUMASK = 0x1000,
+       CAP_VALIDATE = 0x2000,
+       CAP_SETPROCNAME = 0x4000,
+};
+
+typedef struct {
+	const char *name;
+	unsigned int flag;
+} cappair_t;
+
+static const cappair_t captable[] = {
+    {"getencoding", CAP_GETENCODING},
+    {"runcommand", CAP_RUNCOMMAND},
+    {"attachio", CAP_ATTACHIO},
+    {"chdir", CAP_CHDIR},
+    {"setenv", CAP_SETENV},
+    {"setumask", CAP_SETUMASK},
+    {"validate", CAP_VALIDATE},
+    {"setprocname", CAP_SETPROCNAME},
+    {NULL, 0}, /* terminator */
+};
+
+typedef struct {
+	char ch;
+	char *data;
+	size_t maxdatasize;
+	size_t datasize;
+} context_t;
+
+struct hgclient_tag_ {
+	int sockfd;
+	pid_t pgid;
+	pid_t pid;
+	context_t ctx;
+	unsigned int capflags;
+};
+
+static const size_t defaultdatasize = 4096;
+
+static void attachio(hgclient_t *hgc);
+
+static void initcontext(context_t *ctx)
+{
+	ctx->ch = '\0';
+	ctx->data = malloc(defaultdatasize);
+	ctx->maxdatasize = (ctx->data) ? defaultdatasize : 0;
+	ctx->datasize = 0;
+	debugmsg("initialize context buffer with size %zu", ctx->maxdatasize);
+}
+
+static void enlargecontext(context_t *ctx, size_t newsize)
+{
+	if (newsize <= ctx->maxdatasize)
+		return;
+
+	newsize = defaultdatasize *
+	          ((newsize + defaultdatasize - 1) / defaultdatasize);
+	ctx->data = reallocx(ctx->data, newsize);
+	ctx->maxdatasize = newsize;
+	debugmsg("enlarge context buffer to %zu", ctx->maxdatasize);
+}
+
+static void freecontext(context_t *ctx)
+{
+	debugmsg("free context buffer");
+	free(ctx->data);
+	ctx->data = NULL;
+	ctx->maxdatasize = 0;
+	ctx->datasize = 0;
+}
+
+/* Read channeled response from cmdserver */
+static void readchannel(hgclient_t *hgc)
+{
+	assert(hgc);
+
+	ssize_t rsize = recv(hgc->sockfd, &hgc->ctx.ch, sizeof(hgc->ctx.ch), 0);
+	if (rsize != sizeof(hgc->ctx.ch)) {
+		/* server would have exception and traceback would be printed */
+		debugmsg("failed to read channel");
+		exit(255);
+	}
+
+	uint32_t datasize_n;
+	rsize = recv(hgc->sockfd, &datasize_n, sizeof(datasize_n), 0);
+	if (rsize != sizeof(datasize_n))
+		abortmsg("failed to read data size");
+
+	/* datasize denotes the maximum size to write if input request */
+	hgc->ctx.datasize = ntohl(datasize_n);
+	enlargecontext(&hgc->ctx, hgc->ctx.datasize);
+
+	if (isupper(hgc->ctx.ch) && hgc->ctx.ch != 'S')
+		return; /* assumes input request */
+
+	size_t cursize = 0;
+	while (cursize < hgc->ctx.datasize) {
+		rsize = recv(hgc->sockfd, hgc->ctx.data + cursize,
+		             hgc->ctx.datasize - cursize, 0);
+		if (rsize < 1)
+			abortmsg("failed to read data block");
+		cursize += rsize;
+	}
+}
+
+static void sendall(int sockfd, const void *data, size_t datasize)
+{
+	const char *p = data;
+	const char *const endp = p + datasize;
+	while (p < endp) {
+		ssize_t r = send(sockfd, p, endp - p, 0);
+		if (r < 0)
+			abortmsgerrno("cannot communicate");
+		p += r;
+	}
+}
+
+/* Write lengh-data block to cmdserver */
+static void writeblock(const hgclient_t *hgc)
+{
+	assert(hgc);
+
+	const uint32_t datasize_n = htonl(hgc->ctx.datasize);
+	sendall(hgc->sockfd, &datasize_n, sizeof(datasize_n));
+
+	sendall(hgc->sockfd, hgc->ctx.data, hgc->ctx.datasize);
+}
+
+static void writeblockrequest(const hgclient_t *hgc, const char *chcmd)
+{
+	debugmsg("request %s, block size %zu", chcmd, hgc->ctx.datasize);
+
+	char buf[strlen(chcmd) + 1];
+	memcpy(buf, chcmd, sizeof(buf) - 1);
+	buf[sizeof(buf) - 1] = '\n';
+	sendall(hgc->sockfd, buf, sizeof(buf));
+
+	writeblock(hgc);
+}
+
+/* Build '\0'-separated list of args. argsize < 0 denotes that args are
+ * terminated by NULL. */
+static void packcmdargs(context_t *ctx, const char *const args[],
+                        ssize_t argsize)
+{
+	ctx->datasize = 0;
+	const char *const *const end = (argsize >= 0) ? args + argsize : NULL;
+	for (const char *const *it = args; it != end && *it; ++it) {
+		const size_t n = strlen(*it) + 1; /* include '\0' */
+		enlargecontext(ctx, ctx->datasize + n);
+		memcpy(ctx->data + ctx->datasize, *it, n);
+		ctx->datasize += n;
+	}
+
+	if (ctx->datasize > 0)
+		--ctx->datasize; /* strip last '\0' */
+}
+
+/* Extract '\0'-separated list of args to new buffer, terminated by NULL */
+static const char **unpackcmdargsnul(const context_t *ctx)
+{
+	const char **args = NULL;
+	size_t nargs = 0, maxnargs = 0;
+	const char *s = ctx->data;
+	const char *e = ctx->data + ctx->datasize;
+	for (;;) {
+		if (nargs + 1 >= maxnargs) { /* including last NULL */
+			maxnargs += 256;
+			args = reallocx(args, maxnargs * sizeof(args[0]));
+		}
+		args[nargs] = s;
+		nargs++;
+		s = memchr(s, '\0', e - s);
+		if (!s)
+			break;
+		s++;
+	}
+	args[nargs] = NULL;
+	return args;
+}
+
+static void handlereadrequest(hgclient_t *hgc)
+{
+	context_t *ctx = &hgc->ctx;
+	size_t r = fread(ctx->data, sizeof(ctx->data[0]), ctx->datasize, stdin);
+	ctx->datasize = r;
+	writeblock(hgc);
+}
+
+/* Read single-line */
+static void handlereadlinerequest(hgclient_t *hgc)
+{
+	context_t *ctx = &hgc->ctx;
+	if (!fgets(ctx->data, ctx->datasize, stdin))
+		ctx->data[0] = '\0';
+	ctx->datasize = strlen(ctx->data);
+	writeblock(hgc);
+}
+
+/* Execute the requested command and write exit code */
+static void handlesystemrequest(hgclient_t *hgc)
+{
+	context_t *ctx = &hgc->ctx;
+	enlargecontext(ctx, ctx->datasize + 1);
+	ctx->data[ctx->datasize] = '\0'; /* terminate last string */
+
+	const char **args = unpackcmdargsnul(ctx);
+	if (!args[0] || !args[1] || !args[2])
+		abortmsg("missing type or command or cwd in system request");
+	if (strcmp(args[0], "system") == 0) {
+		debugmsg("run '%s' at '%s'", args[1], args[2]);
+		int32_t r = runshellcmd(args[1], args + 3, args[2]);
+		free(args);
+
+		uint32_t r_n = htonl(r);
+		memcpy(ctx->data, &r_n, sizeof(r_n));
+		ctx->datasize = sizeof(r_n);
+		writeblock(hgc);
+	} else if (strcmp(args[0], "pager") == 0) {
+		setuppager(args[1], args + 3);
+		if (hgc->capflags & CAP_ATTACHIO)
+			attachio(hgc);
+		/* unblock the server */
+		static const char emptycmd[] = "\n";
+		sendall(hgc->sockfd, emptycmd, sizeof(emptycmd) - 1);
+	} else {
+		abortmsg("unknown type in system request: %s", args[0]);
+	}
+}
+
+/* Read response of command execution until receiving 'r'-esult */
+static void handleresponse(hgclient_t *hgc)
+{
+	for (;;) {
+		readchannel(hgc);
+		context_t *ctx = &hgc->ctx;
+		debugmsg("response read from channel %c, size %zu", ctx->ch,
+		         ctx->datasize);
+		switch (ctx->ch) {
+		case 'o':
+			fwrite(ctx->data, sizeof(ctx->data[0]), ctx->datasize,
+			       stdout);
+			break;
+		case 'e':
+			fwrite(ctx->data, sizeof(ctx->data[0]), ctx->datasize,
+			       stderr);
+			break;
+		case 'd':
+			/* assumes last char is '\n' */
+			ctx->data[ctx->datasize - 1] = '\0';
+			debugmsg("server: %s", ctx->data);
+			break;
+		case 'r':
+			return;
+		case 'I':
+			handlereadrequest(hgc);
+			break;
+		case 'L':
+			handlereadlinerequest(hgc);
+			break;
+		case 'S':
+			handlesystemrequest(hgc);
+			break;
+		default:
+			if (isupper(ctx->ch))
+				abortmsg("cannot handle response (ch = %c)",
+				         ctx->ch);
+		}
+	}
+}
+
+static unsigned int parsecapabilities(const char *s, const char *e)
+{
+	unsigned int flags = 0;
+	while (s < e) {
+		const char *t = strchr(s, ' ');
+		if (!t || t > e)
+			t = e;
+		const cappair_t *cap;
+		for (cap = captable; cap->flag; ++cap) {
+			size_t n = t - s;
+			if (strncmp(s, cap->name, n) == 0 &&
+			    strlen(cap->name) == n) {
+				flags |= cap->flag;
+				break;
+			}
+		}
+		s = t + 1;
+	}
+	return flags;
+}
+
+static void readhello(hgclient_t *hgc)
+{
+	readchannel(hgc);
+	context_t *ctx = &hgc->ctx;
+	if (ctx->ch != 'o') {
+		char ch = ctx->ch;
+		if (ch == 'e') {
+			/* write early error and will exit */
+			fwrite(ctx->data, sizeof(ctx->data[0]), ctx->datasize,
+			       stderr);
+			handleresponse(hgc);
+		}
+		abortmsg("unexpected channel of hello message (ch = %c)", ch);
+	}
+	enlargecontext(ctx, ctx->datasize + 1);
+	ctx->data[ctx->datasize] = '\0';
+	debugmsg("hello received: %s (size = %zu)", ctx->data, ctx->datasize);
+
+	const char *s = ctx->data;
+	const char *const dataend = ctx->data + ctx->datasize;
+	while (s < dataend) {
+		const char *t = strchr(s, ':');
+		if (!t || t[1] != ' ')
+			break;
+		const char *u = strchr(t + 2, '\n');
+		if (!u)
+			u = dataend;
+		if (strncmp(s, "capabilities:", t - s + 1) == 0) {
+			hgc->capflags = parsecapabilities(t + 2, u);
+		} else if (strncmp(s, "pgid:", t - s + 1) == 0) {
+			hgc->pgid = strtol(t + 2, NULL, 10);
+		} else if (strncmp(s, "pid:", t - s + 1) == 0) {
+			hgc->pid = strtol(t + 2, NULL, 10);
+		}
+		s = u + 1;
+	}
+	debugmsg("capflags=0x%04x, pid=%d", hgc->capflags, hgc->pid);
+}
+
+static void updateprocname(hgclient_t *hgc)
+{
+	int r = snprintf(hgc->ctx.data, hgc->ctx.maxdatasize, "chg[worker/%d]",
+	                 (int)getpid());
+	if (r < 0 || (size_t)r >= hgc->ctx.maxdatasize)
+		abortmsg("insufficient buffer to write procname (r = %d)", r);
+	hgc->ctx.datasize = (size_t)r;
+	writeblockrequest(hgc, "setprocname");
+}
+
+static void attachio(hgclient_t *hgc)
+{
+	debugmsg("request attachio");
+	static const char chcmd[] = "attachio\n";
+	sendall(hgc->sockfd, chcmd, sizeof(chcmd) - 1);
+	readchannel(hgc);
+	context_t *ctx = &hgc->ctx;
+	if (ctx->ch != 'I')
+		abortmsg("unexpected response for attachio (ch = %c)", ctx->ch);
+
+	static const int fds[3] = {STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO};
+	struct msghdr msgh;
+	memset(&msgh, 0, sizeof(msgh));
+	struct iovec iov = {ctx->data, ctx->datasize}; /* dummy payload */
+	msgh.msg_iov = &iov;
+	msgh.msg_iovlen = 1;
+	char fdbuf[CMSG_SPACE(sizeof(fds))];
+	msgh.msg_control = fdbuf;
+	msgh.msg_controllen = sizeof(fdbuf);
+	struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msgh);
+	cmsg->cmsg_level = SOL_SOCKET;
+	cmsg->cmsg_type = SCM_RIGHTS;
+	cmsg->cmsg_len = CMSG_LEN(sizeof(fds));
+	memcpy(CMSG_DATA(cmsg), fds, sizeof(fds));
+	msgh.msg_controllen = cmsg->cmsg_len;
+	ssize_t r = sendmsg(hgc->sockfd, &msgh, 0);
+	if (r < 0)
+		abortmsgerrno("sendmsg failed");
+
+	handleresponse(hgc);
+	int32_t n;
+	if (ctx->datasize != sizeof(n))
+		abortmsg("unexpected size of attachio result");
+	memcpy(&n, ctx->data, sizeof(n));
+	n = ntohl(n);
+	if (n != sizeof(fds) / sizeof(fds[0]))
+		abortmsg("failed to send fds (n = %d)", n);
+}
+
+static void chdirtocwd(hgclient_t *hgc)
+{
+	if (!getcwd(hgc->ctx.data, hgc->ctx.maxdatasize))
+		abortmsgerrno("failed to getcwd");
+	hgc->ctx.datasize = strlen(hgc->ctx.data);
+	writeblockrequest(hgc, "chdir");
+}
+
+static void forwardumask(hgclient_t *hgc)
+{
+	mode_t mask = umask(0);
+	umask(mask);
+
+	static const char command[] = "setumask\n";
+	sendall(hgc->sockfd, command, sizeof(command) - 1);
+	uint32_t data = htonl(mask);
+	sendall(hgc->sockfd, &data, sizeof(data));
+}
+
+/*!
+ * Open connection to per-user cmdserver
+ *
+ * If no background server running, returns NULL.
+ */
+hgclient_t *hgc_open(const char *sockname)
+{
+	int fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (fd < 0)
+		abortmsgerrno("cannot create socket");
+
+	/* don't keep fd on fork(), so that it can be closed when the parent
+	 * process get terminated. */
+	fsetcloexec(fd);
+
+	struct sockaddr_un addr;
+	addr.sun_family = AF_UNIX;
+
+	/* use chdir to workaround small sizeof(sun_path) */
+	int bakfd = -1;
+	const char *basename = sockname;
+	{
+		const char *split = strrchr(sockname, '/');
+		if (split && split != sockname) {
+			if (split[1] == '\0')
+				abortmsg("sockname cannot end with a slash");
+			size_t len = split - sockname;
+			char sockdir[len + 1];
+			memcpy(sockdir, sockname, len);
+			sockdir[len] = '\0';
+
+			bakfd = open(".", O_DIRECTORY);
+			if (bakfd == -1)
+				abortmsgerrno("cannot open cwd");
+
+			int r = chdir(sockdir);
+			if (r != 0)
+				abortmsgerrno("cannot chdir %s", sockdir);
+
+			basename = split + 1;
+		}
+	}
+	if (strlen(basename) >= sizeof(addr.sun_path))
+		abortmsg("sockname is too long: %s", basename);
+	strncpy(addr.sun_path, basename, sizeof(addr.sun_path));
+	addr.sun_path[sizeof(addr.sun_path) - 1] = '\0';
+
+	/* real connect */
+	int r = connect(fd, (struct sockaddr *)&addr, sizeof(addr));
+	if (r < 0) {
+		if (errno != ENOENT && errno != ECONNREFUSED)
+			abortmsgerrno("cannot connect to %s", sockname);
+	}
+	if (bakfd != -1) {
+		fchdirx(bakfd);
+		close(bakfd);
+	}
+	if (r < 0) {
+		close(fd);
+		return NULL;
+	}
+	debugmsg("connected to %s", addr.sun_path);
+
+	hgclient_t *hgc = mallocx(sizeof(hgclient_t));
+	memset(hgc, 0, sizeof(*hgc));
+	hgc->sockfd = fd;
+	initcontext(&hgc->ctx);
+
+	readhello(hgc);
+	if (!(hgc->capflags & CAP_RUNCOMMAND))
+		abortmsg("insufficient capability: runcommand");
+	if (hgc->capflags & CAP_SETPROCNAME)
+		updateprocname(hgc);
+	if (hgc->capflags & CAP_ATTACHIO)
+		attachio(hgc);
+	if (hgc->capflags & CAP_CHDIR)
+		chdirtocwd(hgc);
+	if (hgc->capflags & CAP_SETUMASK)
+		forwardumask(hgc);
+
+	return hgc;
+}
+
+/*!
+ * Close connection and free allocated memory
+ */
+void hgc_close(hgclient_t *hgc)
+{
+	assert(hgc);
+	freecontext(&hgc->ctx);
+	close(hgc->sockfd);
+	free(hgc);
+}
+
+pid_t hgc_peerpgid(const hgclient_t *hgc)
+{
+	assert(hgc);
+	return hgc->pgid;
+}
+
+pid_t hgc_peerpid(const hgclient_t *hgc)
+{
+	assert(hgc);
+	return hgc->pid;
+}
+
+/*!
+ * Send command line arguments to let the server load the repo config and check
+ * whether it can process our request directly or not.
+ * Make sure hgc_setenv is called before calling this.
+ *
+ * @return - NULL, the server believes it can handle our request, or does not
+ *           support "validate" command.
+ *         - a list of strings, the server probably cannot handle our request
+ *           and it sent instructions telling us what to do next. See
+ *           chgserver.py for possible instruction formats.
+ *           the list should be freed by the caller.
+ *           the last string is guaranteed to be NULL.
+ */
+const char **hgc_validate(hgclient_t *hgc, const char *const args[],
+                          size_t argsize)
+{
+	assert(hgc);
+	if (!(hgc->capflags & CAP_VALIDATE))
+		return NULL;
+
+	packcmdargs(&hgc->ctx, args, argsize);
+	writeblockrequest(hgc, "validate");
+	handleresponse(hgc);
+
+	/* the server returns '\0' if it can handle our request */
+	if (hgc->ctx.datasize <= 1)
+		return NULL;
+
+	/* make sure the buffer is '\0' terminated */
+	enlargecontext(&hgc->ctx, hgc->ctx.datasize + 1);
+	hgc->ctx.data[hgc->ctx.datasize] = '\0';
+	return unpackcmdargsnul(&hgc->ctx);
+}
+
+/*!
+ * Execute the specified Mercurial command
+ *
+ * @return result code
+ */
+int hgc_runcommand(hgclient_t *hgc, const char *const args[], size_t argsize)
+{
+	assert(hgc);
+
+	packcmdargs(&hgc->ctx, args, argsize);
+	writeblockrequest(hgc, "runcommand");
+	handleresponse(hgc);
+
+	int32_t exitcode_n;
+	if (hgc->ctx.datasize != sizeof(exitcode_n)) {
+		abortmsg("unexpected size of exitcode");
+	}
+	memcpy(&exitcode_n, hgc->ctx.data, sizeof(exitcode_n));
+	return ntohl(exitcode_n);
+}
+
+/*!
+ * (Re-)send client's stdio channels so that the server can access to tty
+ */
+void hgc_attachio(hgclient_t *hgc)
+{
+	assert(hgc);
+	if (!(hgc->capflags & CAP_ATTACHIO))
+		return;
+	attachio(hgc);
+}
+
+/*!
+ * Update server's environment variables
+ *
+ * @param envp  list of environment variables in "NAME=VALUE" format,
+ *              terminated by NULL.
+ */
+void hgc_setenv(hgclient_t *hgc, const char *const envp[])
+{
+	assert(hgc && envp);
+	if (!(hgc->capflags & CAP_SETENV))
+		return;
+	packcmdargs(&hgc->ctx, envp, /*argsize*/ -1);
+	writeblockrequest(hgc, "setenv");
+}

contrib/chg/hgclient.h

@@ -0,0 +1,30 b''
+/*
+ * A command server client that uses Unix domain socket
+ *
+ * Copyright (c) 2011 Yuya Nishihara <[e-mail]>
+ *
+ * This software may be used and distributed according to the terms of the
+ * GNU General Public License version 2 or any later version.
+ */
+
+#ifndef HGCLIENT_H_
+#define HGCLIENT_H_
+
+#include <sys/types.h>
+
+struct hgclient_tag_;
+typedef struct hgclient_tag_ hgclient_t;
+
+hgclient_t *hgc_open(const char *sockname);
+void hgc_close(hgclient_t *hgc);
+
+pid_t hgc_peerpgid(const hgclient_t *hgc);
+pid_t hgc_peerpid(const hgclient_t *hgc);
+
+const char **hgc_validate(hgclient_t *hgc, const char *const args[],
+                          size_t argsize);
+int hgc_runcommand(hgclient_t *hgc, const char *const args[], size_t argsize);
+void hgc_attachio(hgclient_t *hgc);
+void hgc_setenv(hgclient_t *hgc, const char *const envp[]);
+
+#endif /* HGCLIENT_H_ */

contrib/chg/procutil.c

@@ -0,0 +1,237 b''
+/*
+ * Utilities about process handling - signal and subprocess (ex. pager)
+ *
+ * Copyright (c) 2011 Yuya Nishihara <[e-mail]>
+ *
+ * This software may be used and distributed according to the terms of the
+ * GNU General Public License version 2 or any later version.
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "procutil.h"
+#include "util.h"
+
+static pid_t pagerpid = 0;
+static pid_t peerpgid = 0;
+static pid_t peerpid = 0;
+
+static void forwardsignal(int sig)
+{
+	assert(peerpid > 0);
+	if (kill(peerpid, sig) < 0)
+		abortmsgerrno("cannot kill %d", peerpid);
+	debugmsg("forward signal %d", sig);
+}
+
+static void forwardsignaltogroup(int sig)
+{
+	/* prefer kill(-pgid, sig), fallback to pid if pgid is invalid */
+	pid_t killpid = peerpgid > 1 ? -peerpgid : peerpid;
+	if (kill(killpid, sig) < 0)
+		abortmsgerrno("cannot kill %d", killpid);
+	debugmsg("forward signal %d to %d", sig, killpid);
+}
+
+static void handlestopsignal(int sig)
+{
+	sigset_t unblockset, oldset;
+	struct sigaction sa, oldsa;
+	if (sigemptyset(&unblockset) < 0)
+		goto error;
+	if (sigaddset(&unblockset, sig) < 0)
+		goto error;
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = SIG_DFL;
+	sa.sa_flags = SA_RESTART;
+	if (sigemptyset(&sa.sa_mask) < 0)
+		goto error;
+
+	forwardsignal(sig);
+	if (raise(sig) < 0) /* resend to self */
+		goto error;
+	if (sigaction(sig, &sa, &oldsa) < 0)
+		goto error;
+	if (sigprocmask(SIG_UNBLOCK, &unblockset, &oldset) < 0)
+		goto error;
+	/* resent signal will be handled before sigprocmask() returns */
+	if (sigprocmask(SIG_SETMASK, &oldset, NULL) < 0)
+		goto error;
+	if (sigaction(sig, &oldsa, NULL) < 0)
+		goto error;
+	return;
+
+error:
+	abortmsgerrno("failed to handle stop signal");
+}
+
+static void handlechildsignal(int sig UNUSED_)
+{
+	if (peerpid == 0 || pagerpid == 0)
+		return;
+	/* if pager exits, notify the server with SIGPIPE immediately.
+	 * otherwise the server won't get SIGPIPE if it does not write
+	 * anything. (issue5278) */
+	if (waitpid(pagerpid, NULL, WNOHANG) == pagerpid)
+		kill(peerpid, SIGPIPE);
+}
+
+void setupsignalhandler(pid_t pid, pid_t pgid)
+{
+	if (pid <= 0)
+		return;
+	peerpid = pid;
+	peerpgid = (pgid <= 1 ? 0 : pgid);
+
+	struct sigaction sa;
+	memset(&sa, 0, sizeof(sa));
+
+	/* deadly signals meant to be sent to a process group:
+	 * - SIGHUP: usually generated by the kernel, when termination of a
+	 *   process causes that process group to become orphaned
+	 * - SIGINT: usually generated by the terminal */
+	sa.sa_handler = forwardsignaltogroup;
+	sa.sa_flags = SA_RESTART;
+	if (sigemptyset(&sa.sa_mask) < 0)
+		goto error;
+	if (sigaction(SIGHUP, &sa, NULL) < 0)
+		goto error;
+	if (sigaction(SIGINT, &sa, NULL) < 0)
+		goto error;
+
+	/* terminate frontend by double SIGTERM in case of server freeze */
+	sa.sa_handler = forwardsignal;
+	sa.sa_flags |= SA_RESETHAND;
+	if (sigaction(SIGTERM, &sa, NULL) < 0)
+		goto error;
+
+	/* notify the worker about window resize events */
+	sa.sa_flags = SA_RESTART;
+	if (sigaction(SIGWINCH, &sa, NULL) < 0)
+		goto error;
+	/* forward user-defined signals */
+	if (sigaction(SIGUSR1, &sa, NULL) < 0)
+		goto error;
+	if (sigaction(SIGUSR2, &sa, NULL) < 0)
+		goto error;
+	/* propagate job control requests to worker */
+	sa.sa_handler = forwardsignal;
+	sa.sa_flags = SA_RESTART;
+	if (sigaction(SIGCONT, &sa, NULL) < 0)
+		goto error;
+	sa.sa_handler = handlestopsignal;
+	sa.sa_flags = SA_RESTART;
+	if (sigaction(SIGTSTP, &sa, NULL) < 0)
+		goto error;
+	/* get notified when pager exits */
+	sa.sa_handler = handlechildsignal;
+	sa.sa_flags = SA_RESTART;
+	if (sigaction(SIGCHLD, &sa, NULL) < 0)
+		goto error;
+
+	return;
+
+error:
+	abortmsgerrno("failed to set up signal handlers");
+}
+
+void restoresignalhandler(void)
+{
+	struct sigaction sa;
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = SIG_DFL;
+	sa.sa_flags = SA_RESTART;
+	if (sigemptyset(&sa.sa_mask) < 0)
+		goto error;
+
+	if (sigaction(SIGHUP, &sa, NULL) < 0)
+		goto error;
+	if (sigaction(SIGTERM, &sa, NULL) < 0)
+		goto error;
+	if (sigaction(SIGWINCH, &sa, NULL) < 0)
+		goto error;
+	if (sigaction(SIGCONT, &sa, NULL) < 0)
+		goto error;
+	if (sigaction(SIGTSTP, &sa, NULL) < 0)
+		goto error;
+	if (sigaction(SIGCHLD, &sa, NULL) < 0)
+		goto error;
+
+	/* ignore Ctrl+C while shutting down to make pager exits cleanly */
+	sa.sa_handler = SIG_IGN;
+	if (sigaction(SIGINT, &sa, NULL) < 0)
+		goto error;
+
+	peerpid = 0;
+	return;
+
+error:
+	abortmsgerrno("failed to restore signal handlers");
+}
+
+/* This implementation is based on hgext/pager.py (post 369741ef7253)
+ * Return 0 if pager is not started, or pid of the pager */
+pid_t setuppager(const char *pagercmd, const char *envp[])
+{
+	assert(pagerpid == 0);
+	if (!pagercmd)
+		return 0;
+
+	int pipefds[2];
+	if (pipe(pipefds) < 0)
+		return 0;
+	pid_t pid = fork();
+	if (pid < 0)
+		goto error;
+	if (pid > 0) {
+		close(pipefds[0]);
+		if (dup2(pipefds[1], fileno(stdout)) < 0)
+			goto error;
+		if (isatty(fileno(stderr))) {
+			if (dup2(pipefds[1], fileno(stderr)) < 0)
+				goto error;
+		}
+		close(pipefds[1]);
+		pagerpid = pid;
+		return pid;
+	} else {
+		dup2(pipefds[0], fileno(stdin));
+		close(pipefds[0]);
+		close(pipefds[1]);
+
+		int r =
+		    execle("/bin/sh", "/bin/sh", "-c", pagercmd, NULL, envp);
+		if (r < 0) {
+			abortmsgerrno("cannot start pager '%s'", pagercmd);
+		}
+		return 0;
+	}
+
+error:
+	close(pipefds[0]);
+	close(pipefds[1]);
+	abortmsgerrno("failed to prepare pager");
+	return 0;
+}
+
+void waitpager(void)
+{
+	if (pagerpid == 0)
+		return;
+
+	/* close output streams to notify the pager its input ends */
+	fclose(stdout);
+	fclose(stderr);
+	while (1) {
+		pid_t ret = waitpid(pagerpid, NULL, 0);
+		if (ret == -1 && errno == EINTR)
+			continue;
+		break;
+	}
+}

contrib/chg/procutil.h

@@ -0,0 +1,21 b''
+/*
+ * Utilities about process handling - signal and subprocess (ex. pager)
+ *
+ * Copyright (c) 2011 Yuya Nishihara <[e-mail]>
+ *
+ * This software may be used and distributed according to the terms of the
+ * GNU General Public License version 2 or any later version.
+ */
+
+#ifndef PROCUTIL_H_
+#define PROCUTIL_H_
+
+#include <unistd.h>
+
+void restoresignalhandler(void);
+void setupsignalhandler(pid_t pid, pid_t pgid);
+
+pid_t setuppager(const char *pagercmd, const char *envp[]);
+void waitpager(void);
+
+#endif /* PROCUTIL_H_ */

contrib/chg/util.c

@@ -0,0 +1,200 b''
+/*
+ * Utility functions
+ *
+ * Copyright (c) 2011 Yuya Nishihara <[e-mail]>
+ *
+ * This software may be used and distributed according to the terms of the
+ * GNU General Public License version 2 or any later version.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "util.h"
+
+static int colorenabled = 0;
+
+static inline void fsetcolor(FILE *fp, const char *code)
+{
+	if (!colorenabled)
+		return;
+	fprintf(fp, "\033[%sm", code);
+}
+
+static void vabortmsgerrno(int no, const char *fmt, va_list args)
+{
+	fsetcolor(stderr, "1;31");
+	fputs("chg: abort: ", stderr);
+	vfprintf(stderr, fmt, args);
+	if (no != 0)
+		fprintf(stderr, " (errno = %d, %s)", no, strerror(no));
+	fsetcolor(stderr, "");
+	fputc('\n', stderr);
+	exit(255);
+}
+
+void abortmsg(const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	vabortmsgerrno(0, fmt, args);
+	va_end(args);
+}
+
+void abortmsgerrno(const char *fmt, ...)
+{
+	int no = errno;
+	va_list args;
+	va_start(args, fmt);
+	vabortmsgerrno(no, fmt, args);
+	va_end(args);
+}
+
+static int debugmsgenabled = 0;
+static double debugstart = 0;
+
+static double now()
+{
+	struct timeval t;
+	gettimeofday(&t, NULL);
+	return t.tv_usec / 1e6 + t.tv_sec;
+}
+
+void enablecolor(void)
+{
+	colorenabled = 1;
+}
+
+void enabledebugmsg(void)
+{
+	debugmsgenabled = 1;
+	debugstart = now();
+}
+
+void debugmsg(const char *fmt, ...)
+{
+	if (!debugmsgenabled)
+		return;
+
+	va_list args;
+	va_start(args, fmt);
+	fsetcolor(stderr, "1;30");
+	fprintf(stderr, "chg: debug: %4.6f ", now() - debugstart);
+	vfprintf(stderr, fmt, args);
+	fsetcolor(stderr, "");
+	fputc('\n', stderr);
+	va_end(args);
+}
+
+void fchdirx(int dirfd)
+{
+	int r = fchdir(dirfd);
+	if (r == -1)
+		abortmsgerrno("failed to fchdir");
+}
+
+void fsetcloexec(int fd)
+{
+	int flags = fcntl(fd, F_GETFD);
+	if (flags < 0)
+		abortmsgerrno("cannot get flags of fd %d", fd);
+	if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0)
+		abortmsgerrno("cannot set flags of fd %d", fd);
+}
+
+void *mallocx(size_t size)
+{
+	void *result = malloc(size);
+	if (!result)
+		abortmsg("failed to malloc");
+	return result;
+}
+
+void *reallocx(void *ptr, size_t size)
+{
+	void *result = realloc(ptr, size);
+	if (!result)
+		abortmsg("failed to realloc");
+	return result;
+}
+
+/*
+ * Execute a shell command in mostly the same manner as system(), with the
+ * give environment variables, after chdir to the given cwd. Returns a status
+ * code compatible with the Python subprocess module.
+ */
+int runshellcmd(const char *cmd, const char *envp[], const char *cwd)
+{
+	enum { F_SIGINT = 1, F_SIGQUIT = 2, F_SIGMASK = 4, F_WAITPID = 8 };
+	unsigned int doneflags = 0;
+	int status = 0;
+	struct sigaction newsa, oldsaint, oldsaquit;
+	sigset_t oldmask;
+
+	/* block or mask signals just as system() does */
+	memset(&newsa, 0, sizeof(newsa));
+	newsa.sa_handler = SIG_IGN;
+	newsa.sa_flags = 0;
+	if (sigemptyset(&newsa.sa_mask) < 0)
+		goto done;
+	if (sigaction(SIGINT, &newsa, &oldsaint) < 0)
+		goto done;
+	doneflags |= F_SIGINT;
+	if (sigaction(SIGQUIT, &newsa, &oldsaquit) < 0)
+		goto done;
+	doneflags |= F_SIGQUIT;
+
+	if (sigaddset(&newsa.sa_mask, SIGCHLD) < 0)
+		goto done;
+	if (sigprocmask(SIG_BLOCK, &newsa.sa_mask, &oldmask) < 0)
+		goto done;
+	doneflags |= F_SIGMASK;
+
+	pid_t pid = fork();
+	if (pid < 0)
+		goto done;
+	if (pid == 0) {
+		sigaction(SIGINT, &oldsaint, NULL);
+		sigaction(SIGQUIT, &oldsaquit, NULL);
+		sigprocmask(SIG_SETMASK, &oldmask, NULL);
+		if (cwd && chdir(cwd) < 0)
+			_exit(127);
+		const char *argv[] = {"sh", "-c", cmd, NULL};
+		if (envp) {
+			execve("/bin/sh", (char **)argv, (char **)envp);
+		} else {
+			execv("/bin/sh", (char **)argv);
+		}
+		_exit(127);
+	} else {
+		if (waitpid(pid, &status, 0) < 0)
+			goto done;
+		doneflags |= F_WAITPID;
+	}
+
+done:
+	if (doneflags & F_SIGINT)
+		sigaction(SIGINT, &oldsaint, NULL);
+	if (doneflags & F_SIGQUIT)
+		sigaction(SIGQUIT, &oldsaquit, NULL);
+	if (doneflags & F_SIGMASK)
+		sigprocmask(SIG_SETMASK, &oldmask, NULL);
+
+	/* no way to report other errors, use 127 (= shell termination) */
+	if (!(doneflags & F_WAITPID))
+		return 127;
+	if (WIFEXITED(status))
+		return WEXITSTATUS(status);
+	if (WIFSIGNALED(status))
+		return -WTERMSIG(status);
+	return 127;
+}

contrib/chg/util.h

@@ -0,0 +1,35 b''
+/*
+ * Utility functions
+ *
+ * Copyright (c) 2011 Yuya Nishihara <[e-mail]>
+ *
+ * This software may be used and distributed according to the terms of the
+ * GNU General Public License version 2 or any later version.
+ */
+
+#ifndef UTIL_H_
+#define UTIL_H_
+
+#ifdef __GNUC__
+#define PRINTF_FORMAT_ __attribute__((format(printf, 1, 2)))
+#define UNUSED_ __attribute__((unused))
+#else
+#define PRINTF_FORMAT_
+#define UNUSED_
+#endif
+
+void abortmsg(const char *fmt, ...) PRINTF_FORMAT_;
+void abortmsgerrno(const char *fmt, ...) PRINTF_FORMAT_;
+
+void enablecolor(void);
+void enabledebugmsg(void);
+void debugmsg(const char *fmt, ...) PRINTF_FORMAT_;
+
+void fchdirx(int dirfd);
+void fsetcloexec(int fd);
+void *mallocx(size_t size);
+void *reallocx(void *ptr, size_t size);
+
+int runshellcmd(const char *cmd, const char *envp[], const char *cwd);
+
+#endif /* UTIL_H_ */

contrib/clang-format-ignorelist

@@ -0,0 +1,88 b''
+# Files that just need to be migrated to the formatter.
+# Do not add new files here!
+mercurial/cext/dirs.c
+mercurial/cext/manifest.c
+mercurial/cext/osutil.c
+mercurial/cext/revlog.c
+# Vendored code that we should never format:
+contrib/python-zstandard/c-ext/bufferutil.c
+contrib/python-zstandard/c-ext/compressiondict.c
+contrib/python-zstandard/c-ext/compressionparams.c
+contrib/python-zstandard/c-ext/compressionreader.c
+contrib/python-zstandard/c-ext/compressionwriter.c
+contrib/python-zstandard/c-ext/compressobj.c
+contrib/python-zstandard/c-ext/compressor.c
+contrib/python-zstandard/c-ext/compressoriterator.c
+contrib/python-zstandard/c-ext/constants.c
+contrib/python-zstandard/c-ext/decompressionreader.c
+contrib/python-zstandard/c-ext/decompressionwriter.c
+contrib/python-zstandard/c-ext/decompressobj.c
+contrib/python-zstandard/c-ext/decompressor.c
+contrib/python-zstandard/c-ext/decompressoriterator.c
+contrib/python-zstandard/c-ext/frameparams.c
+contrib/python-zstandard/c-ext/python-zstandard.h
+contrib/python-zstandard/zstd.c
+contrib/python-zstandard/zstd/common/bitstream.h
+contrib/python-zstandard/zstd/common/compiler.h
+contrib/python-zstandard/zstd/common/cpu.h
+contrib/python-zstandard/zstd/common/entropy_common.c
+contrib/python-zstandard/zstd/common/error_private.c
+contrib/python-zstandard/zstd/common/error_private.h
+contrib/python-zstandard/zstd/common/fse_decompress.c
+contrib/python-zstandard/zstd/common/fse.h
+contrib/python-zstandard/zstd/common/huf.h
+contrib/python-zstandard/zstd/common/mem.h
+contrib/python-zstandard/zstd/common/pool.c
+contrib/python-zstandard/zstd/common/pool.h
+contrib/python-zstandard/zstd/common/threading.c
+contrib/python-zstandard/zstd/common/threading.h
+contrib/python-zstandard/zstd/common/xxhash.c
+contrib/python-zstandard/zstd/common/xxhash.h
+contrib/python-zstandard/zstd/common/zstd_common.c
+contrib/python-zstandard/zstd/common/zstd_errors.h
+contrib/python-zstandard/zstd/common/zstd_internal.h
+contrib/python-zstandard/zstd/compress/fse_compress.c
+contrib/python-zstandard/zstd/compress/huf_compress.c
+contrib/python-zstandard/zstd/compress/zstd_compress.c
+contrib/python-zstandard/zstd/compress/zstd_compress_internal.h
+contrib/python-zstandard/zstd/compress/zstd_double_fast.c
+contrib/python-zstandard/zstd/compress/zstd_double_fast.h
+contrib/python-zstandard/zstd/compress/zstd_fast.c
+contrib/python-zstandard/zstd/compress/zstd_fast.h
+contrib/python-zstandard/zstd/compress/zstd_lazy.c
+contrib/python-zstandard/zstd/compress/zstd_lazy.h
+contrib/python-zstandard/zstd/compress/zstd_ldm.c
+contrib/python-zstandard/zstd/compress/zstd_ldm.h
+contrib/python-zstandard/zstd/compress/zstdmt_compress.c
+contrib/python-zstandard/zstd/compress/zstdmt_compress.h
+contrib/python-zstandard/zstd/compress/zstd_opt.c
+contrib/python-zstandard/zstd/compress/zstd_opt.h
+contrib/python-zstandard/zstd/decompress/huf_decompress.c
+contrib/python-zstandard/zstd/decompress/zstd_decompress.c
+contrib/python-zstandard/zstd/deprecated/zbuff_common.c
+contrib/python-zstandard/zstd/deprecated/zbuff_compress.c
+contrib/python-zstandard/zstd/deprecated/zbuff_decompress.c
+contrib/python-zstandard/zstd/deprecated/zbuff.h
+contrib/python-zstandard/zstd/dictBuilder/cover.c
+contrib/python-zstandard/zstd/dictBuilder/divsufsort.c
+contrib/python-zstandard/zstd/dictBuilder/divsufsort.h
+contrib/python-zstandard/zstd/dictBuilder/zdict.c
+contrib/python-zstandard/zstd/dictBuilder/zdict.h
+contrib/python-zstandard/zstd/zstd.h
+hgext/fsmonitor/pywatchman/bser.c
+mercurial/thirdparty/xdiff/xdiff.h
+mercurial/thirdparty/xdiff/xdiffi.c
+mercurial/thirdparty/xdiff/xdiffi.h
+mercurial/thirdparty/xdiff/xemit.c
+mercurial/thirdparty/xdiff/xemit.h
+mercurial/thirdparty/xdiff/xhistogram.c
+mercurial/thirdparty/xdiff/xinclude.h
+mercurial/thirdparty/xdiff/xmacros.h
+mercurial/thirdparty/xdiff/xmerge.c
+mercurial/thirdparty/xdiff/xpatience.c
+mercurial/thirdparty/xdiff/xprepare.c
+mercurial/thirdparty/xdiff/xprepare.h
+mercurial/thirdparty/xdiff/xtypes.h
+mercurial/thirdparty/xdiff/xutils.c
+mercurial/thirdparty/xdiff/xutils.h
+mercurial/thirdparty/zope/interface/_zope_interface_coptimizations.c

contrib/debugcmdserver.py

@@ -0,0 +1,49 b''
+#!/usr/bin/env python
+#
+# Dumps output generated by Mercurial's command server in a formatted style to a
+# given file or stderr if '-' is specified. Output is also written in its raw
+# format to stdout.
+#
+# $ ./hg serve --cmds pipe | ./contrib/debugcmdserver.py -
+# o, 52   -> 'capabilities: getencoding runcommand\nencoding: UTF-8'
+
+from __future__ import absolute_import, print_function
+import struct
+import sys
+
+if len(sys.argv) != 2:
+    print('usage: debugcmdserver.py FILE')
+    sys.exit(1)
+
+outputfmt = '>cI'
+outputfmtsize = struct.calcsize(outputfmt)
+
+if sys.argv[1] == '-':
+    log = sys.stderr
+else:
+    log = open(sys.argv[1], 'a')
+
+def read(size):
+    data = sys.stdin.read(size)
+    if not data:
+        raise EOFError
+    sys.stdout.write(data)
+    sys.stdout.flush()
+    return data
+
+try:
+    while True:
+        header = read(outputfmtsize)
+        channel, length = struct.unpack(outputfmt, header)
+        log.write('%s, %-4d' % (channel, length))
+        if channel in 'IL':
+            log.write(' -> waiting for input\n')
+        else:
+            data = read(length)
+            log.write(' -> %r\n' % data)
+        log.flush()
+except EOFError:
+    pass
+finally:
+    if log != sys.stderr:
+        log.close()

contrib/debugshell.py

@@ -0,0 +1,59 b''
+# debugshell extension
+"""a python shell with repo, changelog & manifest objects"""
+
+from __future__ import absolute_import
+import code
+import mercurial
+import sys
+from mercurial import (
+    demandimport,
+    registrar,
+)
+
+cmdtable = {}
+command = registrar.command(cmdtable)
+
+def pdb(ui, repo, msg, **opts):
+    objects = {
+        'mercurial': mercurial,
+        'repo': repo,
+        'cl': repo.changelog,
+        'mf': repo.manifestlog,
+    }
+
+    code.interact(msg, local=objects)
+
+def ipdb(ui, repo, msg, **opts):
+    import IPython
+
+    cl = repo.changelog
+    mf = repo.manifestlog
+    cl, mf # use variables to appease pyflakes
+
+    IPython.embed()
+
+@command('debugshell|dbsh', [])
+def debugshell(ui, repo, **opts):
+    bannermsg = "loaded repo : %s\n" \
+                "using source: %s" % (repo.root,
+                                      mercurial.__path__[0])
+
+    pdbmap = {
+        'pdb'  : 'code',
+        'ipdb' : 'IPython'
+    }
+
+    debugger = ui.config("ui", "debugger")
+    if not debugger:
+        debugger = 'pdb'
+
+    # if IPython doesn't exist, fallback to code.interact
+    try:
+        with demandimport.deactivated():
+            __import__(pdbmap[debugger])
+    except ImportError:
+        ui.warn(("%s debugger specified but %s module was not found\n")
+                % (debugger, pdbmap[debugger]))
+        debugger = 'pdb'
+
+    getattr(sys.modules[__name__], debugger)(ui, repo, bannermsg, **opts)

contrib/dirstatenonnormalcheck.py

@@ -0,0 +1,59 b''
+# dirstatenonnormalcheck.py - extension to check the consistency of the
+# dirstate's non-normal map
+#
+# For most operations on dirstate, this extensions checks that the nonnormalset
+# contains the right entries.
+# It compares the nonnormal file to a nonnormalset built from the map of all
+# the files in the dirstate to check that they contain the same files.
+
+from __future__ import absolute_import
+
+from mercurial import (
+    dirstate,
+    extensions,
+)
+
+def nonnormalentries(dmap):
+    """Compute nonnormal entries from dirstate's dmap"""
+    res = set()
+    for f, e in dmap.iteritems():
+        if e[0] != b'n' or e[3] == -1:
+            res.add(f)
+    return res
+
+def checkconsistency(ui, orig, dmap, _nonnormalset, label):
+    """Compute nonnormalset from dmap, check that it matches _nonnormalset"""
+    nonnormalcomputedmap = nonnormalentries(dmap)
+    if _nonnormalset != nonnormalcomputedmap:
+        ui.develwarn(b"%s call to %s\n" % (label, orig), config=b'dirstate')
+        ui.develwarn(b"inconsistency in nonnormalset\n", config=b'dirstate')
+        ui.develwarn(b"[nonnormalset] %s\n" % _nonnormalset, config=b'dirstate')
+        ui.develwarn(b"[map] %s\n" % nonnormalcomputedmap, config=b'dirstate')
+
+def _checkdirstate(orig, self, arg):
+    """Check nonnormal set consistency before and after the call to orig"""
+    checkconsistency(self._ui, orig, self._map, self._map.nonnormalset,
+                     b"before")
+    r = orig(self, arg)
+    checkconsistency(self._ui, orig, self._map, self._map.nonnormalset,
+                     b"after")
+    return r
+
+def extsetup(ui):
+    """Wrap functions modifying dirstate to check nonnormalset consistency"""
+    dirstatecl = dirstate.dirstate
+    devel = ui.configbool(b'devel', b'all-warnings')
+    paranoid = ui.configbool(b'experimental', b'nonnormalparanoidcheck')
+    if devel:
+        extensions.wrapfunction(dirstatecl, '_writedirstate', _checkdirstate)
+        if paranoid:
+            # We don't do all these checks when paranoid is disable as it would
+            # make the extension run very slowly on large repos
+            extensions.wrapfunction(dirstatecl, 'normallookup', _checkdirstate)
+            extensions.wrapfunction(dirstatecl, 'otherparent', _checkdirstate)
+            extensions.wrapfunction(dirstatecl, 'normal', _checkdirstate)
+            extensions.wrapfunction(dirstatecl, 'write', _checkdirstate)
+            extensions.wrapfunction(dirstatecl, 'add', _checkdirstate)
+            extensions.wrapfunction(dirstatecl, 'remove', _checkdirstate)
+            extensions.wrapfunction(dirstatecl, 'merge', _checkdirstate)
+            extensions.wrapfunction(dirstatecl, 'drop', _checkdirstate)

contrib/docker/apache-server/Dockerfile

@@ -0,0 +1,23 b''
+FROM debian:wheezy
+
+ENV DEBIAN_FRONTEND noninteractive
+ENV WSGI_PROCESSES 4
+ENV WSGI_THREADS 1
+ENV WSGI_MAX_REQUESTS 100000
+
+EXPOSE 80
+VOLUME ["/var/hg/htdocs", "/var/hg/repos"]
+
+RUN apt-get update && apt-get -y install libapache2-mod-wsgi python-dev vim
+
+# Install our own Apache site.
+RUN a2dissite 000-default
+ADD vhost.conf /etc/apache2/sites-available/hg
+RUN a2ensite hg
+
+ADD hgwebconfig /defaulthgwebconfig
+
+ADD entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]
+
+CMD ["/usr/sbin/apache2", "-DFOREGROUND"]

contrib/docker/apache-server/README.rst

@@ -0,0 +1,144 b''
+====================
+Apache Docker Server
+====================
+
+This directory contains code for running a Mercurial hgweb server via
+mod_wsgi with the Apache HTTP Server inside a Docker container.
+
+.. important::
+
+   This container is intended for testing purposes only: it is
+   **not** meant to be suitable for production use.
+
+Building Image
+==============
+
+The first step is to build a Docker image containing Apache and mod_wsgi::
+
+  $ docker build -t hg-apache .
+
+.. important::
+
+   You should rebuild the image whenever the content of this directory
+   changes. Rebuilding after pulling or when you haven't run the container
+   in a while is typically a good idea.
+
+Running the Server
+==================
+
+To run the container, you'll execute something like::
+
+  $ docker run --rm -it -v `pwd`/../../..:/var/hg/source -p 8000:80 hg-apache
+
+If you aren't a Docker expert:
+
+* ``--rm`` will remove the container when it stops (so it doesn't clutter
+  your system)
+* ``-i`` will launch the container in interactive mode so stdin is attached
+* ``-t`` will allocate a pseudo TTY
+* ``-v src:dst`` will mount the host filesystem at ``src`` into ``dst``
+  in the container. In our example, we assume you are running from this
+  directory and use the source code a few directories up.
+* ``-p 8000:80`` will publish port ``80`` on the container to port ``8000``
+  on the host, allowing you to access the HTTP server on the host interface.
+* ``hg-apache`` is the container image to run. This should correspond to what
+  we build with ``docker build``.
+
+.. important::
+
+   The container **requires** that ``/var/hg/source`` contain the Mercurial
+   source code.
+
+   Upon start, the container will attempt an install of the source in that
+   directory. If the architecture of the host machine doesn't match that of
+   the Docker host (e.g. when running Boot2Docker under OS X), Mercurial's
+   Python C extensions will fail to run. Be sure to ``make clean`` your
+   host's source tree before mounting it in the container to avoid this.
+
+When starting the container, you should see some start-up actions (including
+a Mercurial install) and some output saying Apache has started::
+
+Now if you load ``http://localhost:8000/`` (or whatever interface Docker
+is using), you should see hgweb running!
+
+For your convenience, we've created an empty repository available at
+``/repo``. Feel free to populate it with ``hg push``.
+
+Customizing the Server
+======================
+
+By default, the Docker container installs a basic hgweb config and an
+empty dummy repository. It also uses some reasonable defaults for
+mod_wsgi.
+
+Customizing the WSGI Dispatcher And Mercurial Config
+----------------------------------------------------
+
+By default, the Docker environment installs a custom ``hgweb.wsgi``
+file (based on the example in ``contrib/hgweb.wsgi``). The file
+is installed into ``/var/hg/htdocs/hgweb.wsgi``.
+
+A default hgweb configuration file is also installed. The ``hgwebconfig``
+file from this directory is installed into ``/var/hg/htdocs/config``.
+
+You have a few options for customizing these files.
+
+The simplest is to hack up ``hgwebconfig`` and ``entrypoint.sh`` in
+this directory and to rebuild the Docker image. This has the downside
+that the Mercurial working copy is modified and you may accidentally
+commit unwanted changes.
+
+The next simplest is to copy this directory somewhere, make your changes,
+then rebuild the image. No working copy changes involved.
+
+The preferred solution is to mount a host file into the container and
+overwrite the built-in defaults.
+
+For example, say we create a custom hgweb config file in ``~/hgweb``. We
+can start the container like so to install our custom config file::
+
+  $ docker run -v ~/hgweb:/var/hg/htdocs/config ...
+
+You can do something similar to install a custom WSGI dispatcher::
+
+  $ docker run -v ~/hgweb.wsgi:/var/hg/htdocs/hgweb.wsgi ...
+
+Managing Repositories
+---------------------
+
+Repositories are served from ``/var/hg/repos`` by default. This directory
+is configured as a Docker volume. This means you can mount an existing
+data volume container in the container so repository data is persisted
+across container invocations. See
+https://docs.docker.com/userguide/dockervolumes/ for more.
+
+Alternatively, if you just want to perform lightweight repository
+manipulation, open a shell in the container::
+
+  $ docker exec -it <container> /bin/bash
+
+Then run ``hg init``, etc to manipulate the repositories in ``/var/hg/repos``.
+
+mod_wsgi Configuration Settings
+-------------------------------
+
+mod_wsgi settings can be controlled with the following environment
+variables.
+
+WSGI_PROCESSES
+   Number of WSGI processes to run.
+WSGI_THREADS
+   Number of threads to run in each WSGI process
+WSGI_MAX_REQUESTS
+   Maximum number of requests each WSGI process may serve before it is
+   reaped.
+
+See https://code.google.com/p/modwsgi/wiki/ConfigurationDirectives#WSGIDaemonProcess
+for more on these settings.
+
+.. note::
+
+   The default is to use 1 thread per process. The reason is that Mercurial
+   doesn't perform well in multi-threaded mode due to the GIL. Most people
+   run a single thread per process in production for this reason, so that's
+   what we default to.

contrib/docker/apache-server/entrypoint.sh

@@ -0,0 +1,80 b''
+#!/bin/bash
+
+# This script gets executed on container start. Its job is to set up
+# the Mercurial environment and invoke the server.
+
+# Mercurial can be started in two modes.
+# If the MERCURIAL_SOURCE environment variable is set and it points to a
+# Mercurial source directory, we will install Mercurial from that directory.
+# Otherwise, we download the Mercurial source and install it manually.
+
+set -e
+
+SOURCE_DIR=/var/hg/source
+INSTALL_DIR=/var/hg/install
+REPOS_DIR=/var/hg/repos
+HTDOCS_DIR=/var/hg/htdocs
+
+if [ ! -d ${SOURCE_DIR} ]; then
+  echo "Mercurial source not available at ${SOURCE_DIR}"
+  echo "You need to mount a volume containing the Mercurial source code"
+  echo "when running the container. For example:"
+  echo ""
+  echo "  $ docker run -v ~/src/hg:/${SOURCE_DIR} hg-apache"
+  echo ""
+  echo "This container will now stop running."
+  exit 1
+fi
+
+echo "Installing Mercurial from ${SOURCE_DIR} into ${INSTALL_DIR}"
+pushd ${SOURCE_DIR}
+/usr/bin/python2.7 setup.py install --root=/ --prefix=${INSTALL_DIR} --force
+popd
+
+mkdir -p ${HTDOCS_DIR}
+
+# Provide a default config if the user hasn't supplied one.
+if [ ! -f ${HTDOCS_DIR}/config ]; then
+  cp /defaulthgwebconfig ${HTDOCS_DIR}/config
+fi
+
+if [ ! -f ${HTDOCS_DIR}/hgweb.wsgi ]; then
+  cat >> ${HTDOCS_DIR}/hgweb.wsgi << EOF
+config = '${HTDOCS_DIR}/config'
+
+import sys
+sys.path.insert(0, '${INSTALL_DIR}/lib/python2.7/site-packages')
+
+from mercurial import demandimport
+demandimport.enable()
+
+from mercurial.hgweb import hgweb
+application = hgweb(config)
+EOF
+fi
+
+mkdir -p ${REPOS_DIR}
+
+if [ ! -d ${REPOS_DIR}/repo ]; then
+  ${INSTALL_DIR}/bin/hg init ${REPOS_DIR}/repo
+  chown -R www-data:www-data ${REPOS_DIR}/repo
+fi
+
+# This is necessary to make debuginstall happy.
+if [ ! -f ~/.hgrc ]; then
+  cat >> ~/.hgrc << EOF
+[ui]
+username = Dummy User <[e-mail]>
+EOF
+fi
+
+echo "Verifying Mercurial installation looks happy"
+${INSTALL_DIR}/bin/hg debuginstall
+
+. /etc/apache2/envvars
+
+echo "Starting Apache HTTP Server on port 80"
+echo "We hope you remembered to publish this port when running the container!"
+echo "If this is an interactive container, simply CTRL^C to stop."
+
+exec "$@"

contrib/docker/apache-server/hgwebconfig

@@ -0,0 +1,6 b''
+[paths]
+/ = /var/hg/repos/*
+
+[web]
+allow_push = *
+push_ssl = False

contrib/docker/apache-server/vhost.conf

@@ -0,0 +1,24 b''
+# Apache won't be able to resolve its own hostname, so we sneak this
+# into the global context to silence a confusing-to-user warning on
+# server start.
+ServerName hg
+
+<VirtualHost *:80>
+  DocumentRoot /var/hg/htdocs
+  <Directory />
+    Options FollowSymLinks
+    AllowOverride None
+  </Directory>
+
+  SetEnv HGENCODING UTF-8
+  SetEnv LC_TYPE UTF-8
+
+  WSGIDaemonProcess hg processes=${WSGI_PROCESSES} threads=${WSGI_THREADS} maximum-requests=${WSGI_MAX_REQUESTS} user=www-data group=www-data display-name=hg-wsgi
+  WSGIProcessGroup hg
+
+  WSGIScriptAliasMatch ^(.*) /var/hg/htdocs/hgweb.wsgi$1
+
+  ErrorLog ${APACHE_LOG_DIR}/error.log
+  LogLevel warn
+  CustomLog ${APACHE_LOG_DIR}/access.log combined
+</VirtualHost>

contrib/dumprevlog

@@ -0,0 +1,37 b''
+#!/usr/bin/env python
+# Dump revlogs as raw data stream
+# $ find .hg/store/ -name "*.i" | xargs dumprevlog > repo.dump
+
+from __future__ import absolute_import, print_function
+
+import sys
+from mercurial import (
+    node,
+    revlog,
+)
+from mercurial.utils import (
+    procutil,
+)
+
+for fp in (sys.stdin, sys.stdout, sys.stderr):
+    procutil.setbinary(fp)
+
+def binopen(path, mode='rb'):
+    if 'b' not in mode:
+        mode = mode + 'b'
+    return open(path, mode)
+
+for f in sys.argv[1:]:
+    r = revlog.revlog(binopen, f)
+    print("file:", f)
+    for i in r:
+        n = r.node(i)
+        p = r.parents(n)
+        d = r.revision(n)
+        print("node:", node.hex(n))
+        print("linkrev:", r.linkrev(i))
+        print("parents:", node.hex(p[0]), node.hex(p[1]))
+        print("length:", len(d))
+        print("-start-")
+        print(d)
+        print("-end-")

contrib/editmerge

@@ -0,0 +1,58 b''
+#!/usr/bin/env bash
+# A simple script for opening merge conflicts in the editor.
+# Use the following Mercurial settings to enable it.
+#
+# [ui]
+# merge = editmerge
+#
+# [merge-tools]
+# editmerge.args=$output
+# editmerge.check=changed
+# editmerge.premerge=keep
+
+FILE="$1"
+
+getlines() {
+  grep -n "^<<<<<<" "$FILE" | cut -f1 -d:
+}
+
+# editor preference loosely based on https://mercurial-scm.org/wiki/editor
+# hg showconfig is at the bottom though, since it's slow to run (0.15 seconds)
+ED="$HGEDITOR"
+if [ "$ED" = "" ] ; then
+  ED="$VISUAL"
+fi
+if [ "$ED" = "" ] ; then
+  ED="$EDITOR"
+fi
+if [ "$ED" = "" ] ; then
+  ED="$(hg showconfig ui.editor)"
+fi
+if [ "$ED" = "" ] ; then
+  echo "merge failed - unable to find editor"
+  exit 1
+fi
+
+if [ "$ED" = "emacs" ] || [ "$ED" = "nano" ] || [ "$ED" = "vim" ] ; then
+  FIRSTLINE="$(getlines | head -n 1)"
+  PREVIOUSLINE=""
+
+  # open the editor to the first conflict until there are no more
+  # or the user stops editing the file
+  while [ ! "$FIRSTLINE" = "" ] && [ ! "$FIRSTLINE" = "$PREVIOUSLINE" ] ; do
+    $ED "+$FIRSTLINE" "$FILE"
+    PREVIOUSLINE="$FIRSTLINE"
+    FIRSTLINE="$(getlines | head -n 1)"
+  done
+else
+  $ED "$FILE"
+fi
+
+# get the line numbers of the remaining conflicts
+CONFLICTS="$(getlines | sed ':a;N;$!ba;s/\n/, /g')"
+if [ ! "$CONFLICTS" = "" ] ; then
+  echo "merge failed - resolve the conflicts (line $CONFLICTS) then use 'hg resolve --mark'"
+  exit 1
+fi
+
+exit 0

contrib/editmergeps.bat

@@ -0,0 +1,2 b''
+@echo off
+powershell -NoProfile -ExecutionPolicy unrestricted -Command "& '%~dp0\editmergeps.ps1' %*"

contrib/editmergeps.ps1

@@ -0,0 +1,78 b''
+# A simple script for opening merge conflicts in editor
+# A loose translation of contrib/editmerge to powershell
+# Please make sure that both editmergeps.bat and editmerge.ps1 are available
+# via %PATH% and use the following Mercurial settings to enable it
+#
+# [ui]
+# editmergeps
+# editmergeps.args=$output
+# editmergeps.check=changed
+# editmergeps.premerge=keep
+
+$file=$args[0]
+
+function Get-Lines
+{
+  Select-String "^<<<<<<" $file | % {"$($_.LineNumber)"}
+}
+
+$ed = $Env:HGEDITOR;
+if ($ed -eq $nil)
+{
+  $ed = $Env:VISUAL;
+}
+if ($ed -eq $nil)
+{
+  $ed = $Env:EDITOR;
+}
+if ($ed -eq $nil)
+{
+  $ed = $(hg showconfig ui.editor);
+}
+if ($ed -eq $nil)
+{
+  Write-Error "merge failed - unable to find editor"
+  exit 1
+}
+
+if (($ed -eq "vim") -or ($ed -eq "emacs") -or `
+    ($ed -eq "nano") -or ($ed -eq "notepad++"))
+{
+  $lines = Get-Lines
+  $firstline = if ($lines.Length -gt 0) { $lines[0] } else { $nil }
+  $previousline = $nil;
+
+
+  # open the editor to the first conflict until there are no more
+  # or the user stops editing the file
+  while (($firstline -ne $nil) -and ($firstline -ne $previousline))
+  {
+    if ($ed -eq "notepad++")
+    {
+        $linearg = "-n$firstline"
+    }
+    else
+    {
+        $linearg = "+$firstline"
+    }
+
+    Start-Process -Wait -NoNewWindow $ed $linearg,$file
+    $previousline = $firstline
+    $lines = Get-Lines
+    $firstline = if ($lines.Length -gt 0) { $lines[0] } else { $nil }
+  }
+}
+else
+{
+  & "$ed" $file
+}
+
+$conflicts=Get-Lines
+if ($conflicts.Length -ne 0)
+{
+  Write-Output "merge failed - resolve the conflicts (line $conflicts) then use 'hg resolve --mark'"
+  exit 1
+}
+
+exit 0
+

contrib/fuzz/Makefile

@@ -0,0 +1,81 b''
+CC = clang
+CXX = clang++
+
+all: bdiff mpatch xdiff
+
+fuzzutil.o: fuzzutil.cc fuzzutil.h
+	$(CXX) $(CXXFLAGS) -g -O1 -fsanitize=fuzzer-no-link,address \
+	  -std=c++17 \
+	  -I../../mercurial -c -o fuzzutil.o fuzzutil.cc
+
+fuzzutil-oss-fuzz.o: fuzzutil.cc fuzzutil.h
+	$(CXX) $(CXXFLAGS) -std=c++17 \
+	  -I../../mercurial -c -o fuzzutil-oss-fuzz.o fuzzutil.cc
+
+bdiff.o: ../../mercurial/bdiff.c
+	$(CC) $(CFLAGS) -fsanitize=fuzzer-no-link,address -c -o bdiff.o \
+	  ../../mercurial/bdiff.c
+
+bdiff: bdiff.cc bdiff.o fuzzutil.o
+	$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
+	  -std=c++17 \
+	  -I../../mercurial bdiff.cc bdiff.o fuzzutil.o -o bdiff
+
+bdiff-oss-fuzz.o: ../../mercurial/bdiff.c
+	$(CC) $(CFLAGS) -c -o bdiff-oss-fuzz.o ../../mercurial/bdiff.c
+
+bdiff_fuzzer: bdiff.cc bdiff-oss-fuzz.o fuzzutil-oss-fuzz.o
+	$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial bdiff.cc \
+	  bdiff-oss-fuzz.o fuzzutil-oss-fuzz.o -lFuzzingEngine -o \
+	  $$OUT/bdiff_fuzzer
+
+mpatch.o: ../../mercurial/mpatch.c
+	$(CC) -g -O1 -fsanitize=fuzzer-no-link,address -c -o mpatch.o \
+	  ../../mercurial/mpatch.c
+
+mpatch: CXXFLAGS += -std=c++17
+mpatch: mpatch.cc mpatch.o fuzzutil.o
+	$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
+	  -I../../mercurial mpatch.cc mpatch.o fuzzutil.o -o mpatch
+
+mpatch-oss-fuzz.o: ../../mercurial/mpatch.c
+	$(CC) $(CFLAGS) -c -o mpatch-oss-fuzz.o ../../mercurial/mpatch.c
+
+mpatch_fuzzer: mpatch.cc mpatch-oss-fuzz.o fuzzutil-oss-fuzz.o
+	$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial mpatch.cc \
+	  mpatch-oss-fuzz.o fuzzutil-oss-fuzz.o -lFuzzingEngine -o \
+	  $$OUT/mpatch_fuzzer
+
+mpatch_corpus.zip:
+	python mpatch_corpus.py $$OUT/mpatch_fuzzer_seed_corpus.zip
+
+x%.o: ../../mercurial/thirdparty/xdiff/x%.c ../../mercurial/thirdparty/xdiff/*.h
+	$(CC) -g -O1 -fsanitize=fuzzer-no-link,address -c \
+	  -o $@ \
+	  $<
+
+xdiff: CXXFLAGS += -std=c++17
+xdiff: xdiff.cc xdiffi.o xprepare.o xutils.o fuzzutil.o
+	$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
+	  -I../../mercurial xdiff.cc \
+	  xdiffi.o xprepare.o xutils.o fuzzutil.o -o xdiff
+
+fuzz-x%.o: ../../mercurial/thirdparty/xdiff/x%.c ../../mercurial/thirdparty/xdiff/*.h
+	$(CC) $(CFLAGS) -c \
+	  -o $@ \
+	  $<
+
+xdiff_fuzzer: xdiff.cc fuzz-xdiffi.o fuzz-xprepare.o fuzz-xutils.o fuzzutil-oss-fuzz.o
+	$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial xdiff.cc \
+	  fuzz-xdiffi.o fuzz-xprepare.o fuzz-xutils.o fuzzutil-oss-fuzz.o \
+	  -lFuzzingEngine -o $$OUT/xdiff_fuzzer
+
+clean:
+	$(RM) *.o *_fuzzer \
+	  bdiff \
+	  mpatch \
+	  xdiff
+
+oss-fuzz: bdiff_fuzzer mpatch_fuzzer mpatch_corpus.zip xdiff_fuzzer
+
+.PHONY: all clean oss-fuzz

contrib/fuzz/README.rst

@@ -0,0 +1,26 b''
+How to add fuzzers (partially cribbed from oss-fuzz[0]):
+
+  1) git clone https://github.com/google/oss-fuzz
+  2) cd oss-fuzz
+  3) python infra/helper.py build_image mercurial
+  4) docker run --cap-add=SYS_PTRACE -it -v $HG_REPO_PATH:/hg-new \
+         gcr.io/oss-fuzz/mercurial bash
+  5) cd /src
+  6) rm -r mercurial
+  7) ln -s /hg-new mercurial
+  8) cd mercurial
+  9) compile
+  10) ls $OUT
+
+Step 9 is literally running the command "compile", which is part of
+the docker container. Once you have that working, you can build the
+fuzzers like this (in the oss-fuzz repo):
+
+python infra/helper.py build_fuzzers --sanitizer address mercurial $HG_REPO_PATH
+
+(you can also say "memory", "undefined" or "coverage" for
+sanitizer). Then run the built fuzzers like this:
+
+python infra/helper.py run_fuzzer mercurial -- $FUZZER
+
+0: https://github.com/google/oss-fuzz/blob/master/docs/new_project_guide.md

contrib/fuzz/bdiff.cc

@@ -0,0 +1,44 b''
+/*
+ * bdiff.cc - fuzzer harness for bdiff.c
+ *
+ * Copyright 2018, Google Inc.
+ *
+ * This software may be used and distributed according to the terms of
+ * the GNU General Public License, incorporated herein by reference.
+ */
+#include <memory>
+#include <stdlib.h>
+
+#include "fuzzutil.h"
+
+extern "C" {
+#include "bdiff.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
+{
+	auto maybe_inputs = SplitInputs(Data, Size);
+	if (!maybe_inputs) {
+		return 0;
+	}
+	auto inputs = std::move(maybe_inputs.value());
+
+	struct bdiff_line *a, *b;
+	int an = bdiff_splitlines(inputs.left.get(), inputs.left_size, &a);
+	int bn = bdiff_splitlines(inputs.right.get(), inputs.right_size, &b);
+	struct bdiff_hunk l;
+	bdiff_diff(a, an, b, bn, &l);
+	free(a);
+	free(b);
+	bdiff_freehunks(l.next);
+	return 0; // Non-zero return values are reserved for future use.
+}
+
+#ifdef HG_FUZZER_INCLUDE_MAIN
+int main(int argc, char **argv)
+{
+	const char data[] = "asdf";
+	return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);
+}
+#endif
+
+} // extern "C"

contrib/fuzz/fuzzutil.cc

@@ -0,0 +1,27 b''
+#include "fuzzutil.h"
+
+#include <cstring>
+#include <utility>
+
+contrib::optional<two_inputs> SplitInputs(const uint8_t *Data, size_t Size)
+{
+	if (!Size) {
+		return contrib::nullopt;
+	}
+	// figure out a random point in [0, Size] to split our input.
+	size_t left_size = (Data[0] / 255.0) * (Size - 1);
+
+	// Copy inputs to new allocations so if bdiff over-reads
+	// AddressSanitizer can detect it.
+	std::unique_ptr<char[]> left(new char[left_size]);
+	std::memcpy(left.get(), Data + 1, left_size);
+	// right starts at the next byte after left ends
+	size_t right_size = Size - (left_size + 1);
+	std::unique_ptr<char[]> right(new char[right_size]);
+	std::memcpy(right.get(), Data + 1 + left_size, right_size);
+	LOG(2) << "inputs are  " << left_size << " and " << right_size
+	       << " bytes" << std::endl;
+	two_inputs result = {std::move(right), right_size, std::move(left),
+	                     left_size};
+	return result;
+}

contrib/fuzz/fuzzutil.h

@@ -0,0 +1,47 b''
+#ifndef CONTRIB_FUZZ_FUZZUTIL_H
+#define CONTRIB_FUZZ_FUZZUTIL_H
+#include <iostream>
+#include <memory>
+#include <stdint.h>
+
+/* Try and use std::optional, but failing that assume we'll have a
+ * workable https://abseil.io/ install on the include path to get
+ * their backport of std::optional. */
+#ifdef __has_include
+#if __has_include(<optional>) && __cplusplus >= 201703L
+#include <optional>
+#define CONTRIB_FUZZ_HAVE_STD_OPTIONAL
+#endif
+#endif
+#ifdef CONTRIB_FUZZ_HAVE_STD_OPTIONAL
+namespace contrib
+{
+using std::nullopt;
+using std::optional;
+} /* namespace contrib */
+#else
+#include "third_party/absl/types/optional.h"
+namespace contrib
+{
+using absl::nullopt;
+using absl::optional;
+} /* namespace contrib */
+#endif
+
+/* set DEBUG to 1 for a few debugging prints, or 2 for a lot */
+#define DEBUG 0
+#define LOG(level)                                                             \
+	if (level <= DEBUG)                                                    \
+	std::cout
+
+struct two_inputs {
+	std::unique_ptr<char[]> right;
+	size_t right_size;
+	std::unique_ptr<char[]> left;
+	size_t left_size;
+};
+
+/* Split a non-zero-length input into two inputs. */
+contrib::optional<two_inputs> SplitInputs(const uint8_t *Data, size_t Size);
+
+#endif /* CONTRIB_FUZZ_FUZZUTIL_H */

contrib/fuzz/mpatch.cc

@@ -0,0 +1,122 b''
+/*
+ * mpatch.cc - fuzzer harness for mpatch.c
+ *
+ * Copyright 2018, Google Inc.
+ *
+ * This software may be used and distributed according to the terms of
+ * the GNU General Public License, incorporated herein by reference.
+ */
+#include <iostream>
+#include <memory>
+#include <stdint.h>
+#include <stdlib.h>
+#include <vector>
+
+#include "fuzzutil.h"
+
+// To avoid having too many OOMs from the fuzzer infrastructure, we'll
+// skip patch application if the resulting fulltext would be bigger
+// than 10MiB.
+#define MAX_OUTPUT_SIZE 10485760
+
+extern "C" {
+#include "bitmanipulation.h"
+#include "mpatch.h"
+
+struct mpatchbin {
+	std::unique_ptr<char[]> data;
+	size_t len;
+};
+
+static mpatch_flist *getitem(void *vbins, ssize_t pos)
+{
+	std::vector<mpatchbin> *bins = (std::vector<mpatchbin> *)vbins;
+	const mpatchbin &bin = bins->at(pos + 1);
+	struct mpatch_flist *res;
+	LOG(2) << "mpatch_decode " << bin.len << std::endl;
+	if (mpatch_decode(bin.data.get(), bin.len, &res) < 0)
+		return NULL;
+	return res;
+}
+
+// input format:
+// u8 number of inputs
+// one u16 for each input, its length
+// the inputs
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
+{
+	if (!Size) {
+		return 0;
+	}
+	// First byte of data is how many texts we expect, first text
+	// being the base the rest being the deltas.
+	ssize_t numtexts = Data[0];
+	if (numtexts < 2) {
+		// No point if we don't have at least a base text and a delta...
+		return 0;
+	}
+	// Each text will be described by a byte for how long it
+	// should be, so give up if we don't have enough.
+	if ((Size - 1) < (numtexts * 2)) {
+		return 0;
+	}
+	size_t consumed = 1 + (numtexts * 2);
+	LOG(2) << "input contains " << Size << std::endl;
+	LOG(2) << numtexts << " texts, consuming " << consumed << std::endl;
+	std::vector<mpatchbin> bins;
+	bins.reserve(numtexts);
+	for (int i = 0; i < numtexts; ++i) {
+		mpatchbin bin;
+		size_t nthsize = getbeuint16((char *)Data + 1 + (2 * i));
+		LOG(2) << "text " << i << " is " << nthsize << std::endl;
+		char *start = (char *)Data + consumed;
+		consumed += nthsize;
+		if (consumed > Size) {
+			LOG(2) << "ran out of data, consumed " << consumed
+			       << " of " << Size << std::endl;
+			return 0;
+		}
+		bin.len = nthsize;
+		bin.data.reset(new char[nthsize]);
+		memcpy(bin.data.get(), start, nthsize);
+		bins.push_back(std::move(bin));
+	}
+	LOG(2) << "mpatch_flist" << std::endl;
+	struct mpatch_flist *patch =
+	    mpatch_fold(&bins, getitem, 0, numtexts - 1);
+	if (!patch) {
+		return 0;
+	}
+	LOG(2) << "mpatch_calcsize" << std::endl;
+	ssize_t outlen = mpatch_calcsize(bins[0].len, patch);
+	LOG(2) << "outlen " << outlen << std::endl;
+	if (outlen < 0 || outlen > MAX_OUTPUT_SIZE) {
+		goto cleanup;
+	}
+	{
+		char *dest = (char *)malloc(outlen);
+		LOG(2) << "expecting " << outlen << " total bytes at "
+		       << (void *)dest << std::endl;
+		mpatch_apply(dest, bins[0].data.get(), bins[0].len, patch);
+		free(dest);
+		LOG(1) << "applied a complete patch" << std::endl;
+	}
+cleanup:
+	mpatch_lfree(patch);
+	return 0;
+}
+
+#ifdef HG_FUZZER_INCLUDE_MAIN
+int main(int argc, char **argv)
+{
+	// One text, one patch.
+	const char data[] = "\x02\x00\0x1\x00\x0d"
+	                    // base text
+	                    "a"
+	                    // binary delta that will append a single b
+	                    "\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01b";
+	return LLVMFuzzerTestOneInput((const uint8_t *)data, 19);
+}
+#endif
+
+} // extern "C"

contrib/fuzz/mpatch_corpus.py

@@ -0,0 +1,345 b''
+from __future__ import absolute_import, print_function
+
+import argparse
+import struct
+import zipfile
+
+from mercurial import (
+    hg,
+    ui as uimod,
+)
+
+ap = argparse.ArgumentParser()
+ap.add_argument("out", metavar="some.zip", type=str, nargs=1)
+args = ap.parse_args()
+
+class deltafrag(object):
+    def __init__(self, start, end, data):
+        self.start = start
+        self.end = end
+        self.data = data
+
+    def __str__(self):
+        return struct.pack(
+            ">lll", self.start, self.end, len(self.data)) + self.data
+
+class delta(object):
+    def __init__(self, frags):
+        self.frags = frags
+
+    def __str__(self):
+        return ''.join(str(f) for f in self.frags)
+
+class corpus(object):
+
+    def __init__(self, base, deltas):
+        self.base = base
+        self.deltas = deltas
+
+    def __str__(self):
+        deltas = [str(d) for d in self.deltas]
+        parts = (
+            [
+                struct.pack(">B", len(deltas) + 1),
+                struct.pack(">H", len(self.base)),
+            ]
+            + [struct.pack(">H", len(d)) for d in deltas]
+            + [self.base]
+            + deltas
+        )
+        return "".join(parts)
+
+with zipfile.ZipFile(args.out[0], "w", zipfile.ZIP_STORED) as zf:
+    # Manually constructed entries
+    zf.writestr(
+        "one_delta_applies",
+        str(corpus('a', [delta([deltafrag(0, 1, 'b')])]))
+    )
+    zf.writestr(
+        "one_delta_starts_late",
+        str(corpus('a', [delta([deltafrag(3, 1, 'b')])]))
+    )
+    zf.writestr(
+        "one_delta_ends_late",
+        str(corpus('a', [delta([deltafrag(0, 20, 'b')])]))
+    )
+
+    try:
+        # Generated from repo data
+        r = hg.repository(uimod.ui(), '../..')
+        fl = r.file('mercurial/manifest.py')
+        rl = getattr(fl, '_revlog', fl)
+        bins = rl._chunks(rl._deltachain(10)[0])
+        zf.writestr('manifest_py_rev_10',
+                    str(corpus(bins[0], bins[1:])))
+    except: # skip this, so no re-raises
+        print('skipping seed file from repo data')
+    # Automatically discovered by running the fuzzer
+    zf.writestr(
+        "mpatch_decode_old_overread", "\x02\x00\x00\x00\x02\x00\x00\x00"
+    )
+    # https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=8876
+    zf.writestr(
+        "mpatch_ossfuzz_getbe32_ubsan",
+        "\x02\x00\x00\x00\x0c    \xff\xff\xff\xff    ")
+    zf.writestr(
+        "mpatch_apply_over_memcpy",
+        '\x13\x01\x00\x05\xd0\x00\x00\x00\x00\x00\x00\x00\x00\n \x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x94\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfa\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x13\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00]\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00se\x00\x00'
+        '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+        '\x00\x00\x00\x00')

contrib/fuzz/xdiff.cc

@@ -0,0 +1,58 b''
+/*
+ * xdiff.cc - fuzzer harness for thirdparty/xdiff
+ *
+ * Copyright 2018, Google Inc.
+ *
+ * This software may be used and distributed according to the terms of
+ * the GNU General Public License, incorporated herein by reference.
+ */
+#include "thirdparty/xdiff/xdiff.h"
+#include <inttypes.h>
+#include <stdlib.h>
+
+#include "fuzzutil.h"
+
+extern "C" {
+
+int hunk_consumer(long a1, long a2, long b1, long b2, void *priv)
+{
+	// TODO: probably also test returning -1 from this when things break?
+	return 0;
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
+{
+	auto maybe_inputs = SplitInputs(Data, Size);
+	if (!maybe_inputs) {
+		return 0;
+	}
+	auto inputs = std::move(maybe_inputs.value());
+	mmfile_t a, b;
+
+	a.ptr = inputs.left.get();
+	a.size = inputs.left_size;
+	b.ptr = inputs.right.get();
+	b.size = inputs.right_size;
+	xpparam_t xpp = {
+	    XDF_INDENT_HEURISTIC, /* flags */
+	};
+	xdemitconf_t xecfg = {
+	    XDL_EMIT_BDIFFHUNK, /* flags */
+	    hunk_consumer,      /* hunk_consume_func */
+	};
+	xdemitcb_t ecb = {
+	    NULL, /* priv */
+	};
+	xdl_diff(&a, &b, &xpp, &xecfg, &ecb);
+	return 0; // Non-zero return values are reserved for future use.
+}
+
+#ifdef HG_FUZZER_INCLUDE_MAIN
+int main(int argc, char **argv)
+{
+	const char data[] = "asdf";
+	return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);
+}
+#endif
+
+} // extern "C"

contrib/genosxversion.py

@@ -0,0 +1,130 b''
+#!/usr/bin/env python2
+from __future__ import absolute_import, print_function
+
+import argparse
+import json
+import os
+import subprocess
+import sys
+
+# Always load hg libraries from the hg we can find on $PATH.
+hglib = json.loads(subprocess.check_output(
+    ['hg', 'debuginstall', '-Tjson']))[0]['hgmodules']
+sys.path.insert(0, os.path.dirname(hglib))
+
+from mercurial import util
+
+ap = argparse.ArgumentParser()
+ap.add_argument('--paranoid',
+                action='store_true',
+                help=("Be paranoid about how version numbers compare and "
+                      "produce something that's more likely to sort "
+                      "reasonably."))
+ap.add_argument('--selftest', action='store_true', help='Run self-tests.')
+ap.add_argument('versionfile', help='Path to a valid mercurial __version__.py')
+
+def paranoidver(ver):
+    """Given an hg version produce something that distutils can sort.
+
+    Some Mac package management systems use distutils code in order to
+    figure out upgrades, which makes life difficult. The test case is
+    a reduced version of code in the Munki tool used by some large
+    organizations to centrally manage OS X packages, which is what
+    inspired this kludge.
+
+    >>> paranoidver('3.4')
+    '3.4.0'
+    >>> paranoidver('3.4.2')
+    '3.4.2'
+    >>> paranoidver('3.0-rc+10')
+    '2.9.9999-rc+10'
+    >>> paranoidver('4.2+483-5d44d7d4076e')
+    '4.2.0+483-5d44d7d4076e'
+    >>> paranoidver('4.2.1+598-48d1e1214d8c')
+    '4.2.1+598-48d1e1214d8c'
+    >>> paranoidver('4.3-rc')
+    '4.2.9999-rc'
+    >>> paranoidver('4.3')
+    '4.3.0'
+    >>> from distutils import version
+    >>> class LossyPaddedVersion(version.LooseVersion):
+    ...     '''Subclass version.LooseVersion to compare things like
+    ...     "10.6" and "10.6.0" as equal'''
+    ...     def __init__(self, s):
+    ...             self.parse(s)
+    ...
+    ...     def _pad(self, version_list, max_length):
+    ...         'Pad a version list by adding extra 0 components to the end'
+    ...         # copy the version_list so we don't modify it
+    ...         cmp_list = list(version_list)
+    ...         while len(cmp_list) < max_length:
+    ...             cmp_list.append(0)
+    ...         return cmp_list
+    ...
+    ...     def __cmp__(self, other):
+    ...         if isinstance(other, str):
+    ...             other = MunkiLooseVersion(other)
+    ...         max_length = max(len(self.version), len(other.version))
+    ...         self_cmp_version = self._pad(self.version, max_length)
+    ...         other_cmp_version = self._pad(other.version, max_length)
+    ...         return cmp(self_cmp_version, other_cmp_version)
+    >>> def testver(older, newer):
+    ...   o = LossyPaddedVersion(paranoidver(older))
+    ...   n = LossyPaddedVersion(paranoidver(newer))
+    ...   return o < n
+    >>> testver('3.4', '3.5')
+    True
+    >>> testver('3.4.0', '3.5-rc')
+    True
+    >>> testver('3.4-rc', '3.5')
+    True
+    >>> testver('3.4-rc+10-deadbeef', '3.5')
+    True
+    >>> testver('3.4.2', '3.5-rc')
+    True
+    >>> testver('3.4.2', '3.5-rc+10-deadbeef')
+    True
+    >>> testver('4.2+483-5d44d7d4076e', '4.2.1+598-48d1e1214d8c')
+    True
+    >>> testver('4.3-rc', '4.3')
+    True
+    >>> testver('4.3', '4.3-rc')
+    False
+    """
+    major, minor, micro, extra = util.versiontuple(ver, n=4)
+    if micro is None:
+        micro = 0
+    if extra:
+        if extra.startswith('rc'):
+            if minor == 0:
+                major -= 1
+                minor = 9
+            else:
+                minor -= 1
+            micro = 9999
+            extra = '-' + extra
+        else:
+            extra = '+' + extra
+    else:
+        extra = ''
+    return '%d.%d.%d%s' % (major, minor, micro, extra)
+
+def main(argv):
+    opts = ap.parse_args(argv[1:])
+    if opts.selftest:
+        import doctest
+        doctest.testmod()
+        return
+    with open(opts.versionfile) as f:
+        for l in f:
+            if l.startswith('version = b'):
+                # version number is entire line minus the quotes
+                ver = l[len('version = b') + 1:-2]
+                break
+    if opts.paranoid:
+        print(paranoidver(ver))
+    else:
+        print(ver)
+
+if __name__ == '__main__':
+    main(sys.argv)

contrib/hg-ssh

@@ -0,0 +1,97 b''
+#!/usr/bin/env python
+#
+# Copyright 2005-2007 by Intevation GmbH <[e-mail]>
+#
+# Author(s):
+# Thomas Arendsen Hein <[e-mail]>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+"""
+hg-ssh - a wrapper for ssh access to a limited set of mercurial repos
+
+To be used in ~/.ssh/authorized_keys with the "command" option, see sshd(8):
+command="hg-ssh path/to/repo1 /path/to/repo2 ~/repo3 ~user/repo4" ssh-dss ...
+(probably together with these other useful options:
+ no-port-forwarding,no-X11-forwarding,no-agent-forwarding)
+
+This allows pull/push over ssh from/to the repositories given as arguments.
+
+If all your repositories are subdirectories of a common directory, you can
+allow shorter paths with:
+command="cd path/to/my/repositories && hg-ssh repo1 subdir/repo2"
+
+You can use pattern matching of your normal shell, e.g.:
+command="cd repos && hg-ssh user/thomas/* projects/{mercurial,foo}"
+
+You can also add a --read-only flag to allow read-only access to a key, e.g.:
+command="hg-ssh --read-only repos/*"
+"""
+from __future__ import absolute_import
+
+import os
+import shlex
+import sys
+
+# enable importing on demand to reduce startup time
+import hgdemandimport ; hgdemandimport.enable()
+
+from mercurial import (
+    dispatch,
+    pycompat,
+    ui as uimod,
+)
+
+def main():
+    # Prevent insertion/deletion of CRs
+    dispatch.initstdio()
+
+    cwd = os.getcwd()
+    readonly = False
+    args = sys.argv[1:]
+    while len(args):
+        if args[0] == '--read-only':
+            readonly = True
+            args.pop(0)
+        else:
+            break
+    allowed_paths = [os.path.normpath(os.path.join(cwd,
+                                                   os.path.expanduser(path)))
+                     for path in args]
+    orig_cmd = os.getenv('SSH_ORIGINAL_COMMAND', '?')
+    try:
+        cmdargv = shlex.split(orig_cmd)
+    except ValueError as e:
+        sys.stderr.write('Illegal command "%s": %s\n' % (orig_cmd, e))
+        sys.exit(255)
+
+    if cmdargv[:2] == ['hg', '-R'] and cmdargv[3:] == ['serve', '--stdio']:
+        path = cmdargv[2]
+        repo = os.path.normpath(os.path.join(cwd, os.path.expanduser(path)))
+        if repo in allowed_paths:
+            cmd = [b'-R', pycompat.fsencode(repo), b'serve', b'--stdio']
+            req = dispatch.request(cmd)
+            if readonly:
+                if not req.ui:
+                    req.ui = uimod.ui.load()
+                req.ui.setconfig(b'hooks', b'pretxnopen.hg-ssh',
+                                 b'python:__main__.rejectpush', b'hg-ssh')
+                req.ui.setconfig(b'hooks', b'prepushkey.hg-ssh',
+                                 b'python:__main__.rejectpush', b'hg-ssh')
+            dispatch.dispatch(req)
+        else:
+            sys.stderr.write('Illegal repository "%s"\n' % repo)
+            sys.exit(255)
+    else:
+        sys.stderr.write('Illegal command "%s"\n' % orig_cmd)
+        sys.exit(255)
+
+def rejectpush(ui, **kwargs):
+    ui.warn((b"Permission denied\n"))
+    # mercurial hooks use unix process conventions for hook return values
+    # so a truthy return means failure
+    return True
+
+if __name__ == '__main__':
+    main()

contrib/hg-test-mode.el

@@ -0,0 +1,56 b''
+;; hg-test-mode.el - Major mode for editing Mercurial tests
+;;
+;; Copyright 2014 Matt Mackall <[e-mail]>
+;; "I have no idea what I'm doing"
+;;
+;; This software may be used and distributed according to the terms of the
+;; GNU General Public License version 2 or any later version.
+;;
+;; To enable, add something like the following to your .emacs:
+;;
+;; (if (file-exists-p "~/hg/contrib/hg-test-mode.el")
+;;    (load "~/hg/contrib/hg-test-mode.el"))
+
+(defvar hg-test-mode-hook nil)
+
+(defvar hg-test-mode-map
+  (let ((map (make-keymap)))
+    (define-key map "\C-j" 'newline-and-indent)
+    map)
+  "Keymap for hg test major mode")
+
+(add-to-list 'auto-mode-alist '("\\.t\\'" . hg-test-mode))
+
+(defconst hg-test-font-lock-keywords-1
+  (list
+   '("^  \\(\\$\\|>>>\\) " 1 font-lock-builtin-face)
+   '("^  \\(>\\|\\.\\.\\.\\) " 1 font-lock-constant-face)
+   '("^  \\([[][0-9]+[]]\\)$" 1 font-lock-warning-face)
+   '("^  \\(.*?\\)\\(\\( [(][-a-z]+[)]\\)*\\)$" 1 font-lock-string-face)
+   '("\\$?\\(HG\\|TEST\\)\\w+=?" . font-lock-variable-name-face)
+   '("^  \\(.*?\\)\\(\\( [(][-a-z]+[)]\\)+\\)$" 2 font-lock-type-face)
+   '("^#.*" . font-lock-preprocessor-face)
+   '("^\\([^ ].*\\)$" 1 font-lock-comment-face)
+   )
+  "Minimal highlighting expressions for hg-test mode")
+
+(defvar hg-test-font-lock-keywords hg-test-font-lock-keywords-1
+  "Default highlighting expressions for hg-test mode")
+
+(defvar hg-test-mode-syntax-table
+  (let ((st (make-syntax-table)))
+    (modify-syntax-entry ?\" "w" st) ;; disable standard quoting
+    st)
+"Syntax table for hg-test mode")
+
+(defun hg-test-mode ()
+  (interactive)
+  (kill-all-local-variables)
+  (use-local-map hg-test-mode-map)
+  (set-syntax-table hg-test-mode-syntax-table)
+  (set (make-local-variable 'font-lock-defaults) '(hg-test-font-lock-keywords))
+  (setq major-mode 'hg-test-mode)
+  (setq mode-name "hg-test")
+  (run-hooks 'hg-test-mode-hook))
+
+(provide 'hg-test-mode)

contrib/hgclient.py

@@ -0,0 +1,123 b''
+# A minimal client for Mercurial's command server
+
+from __future__ import absolute_import, print_function
+import os
+import signal
+import socket
+import struct
+import subprocess
+import sys
+import time
+
+try:
+    import cStringIO as io
+    stringio = io.StringIO
+except ImportError:
+    import io
+    stringio = io.StringIO
+
+def connectpipe(path=None):
+    cmdline = ['hg', 'serve', '--cmdserver', 'pipe']
+    if path:
+        cmdline += ['-R', path]
+
+    server = subprocess.Popen(cmdline, stdin=subprocess.PIPE,
+                              stdout=subprocess.PIPE)
+
+    return server
+
+class unixconnection(object):
+    def __init__(self, sockpath):
+        self.sock = sock = socket.socket(socket.AF_UNIX)
+        sock.connect(sockpath)
+        self.stdin = sock.makefile('wb')
+        self.stdout = sock.makefile('rb')
+
+    def wait(self):
+        self.stdin.close()
+        self.stdout.close()
+        self.sock.close()
+
+class unixserver(object):
+    def __init__(self, sockpath, logpath=None, repopath=None):
+        self.sockpath = sockpath
+        cmdline = ['hg', 'serve', '--cmdserver', 'unix', '-a', sockpath]
+        if repopath:
+            cmdline += ['-R', repopath]
+        if logpath:
+            stdout = open(logpath, 'a')
+            stderr = subprocess.STDOUT
+        else:
+            stdout = stderr = None
+        self.server = subprocess.Popen(cmdline, stdout=stdout, stderr=stderr)
+        # wait for listen()
+        while self.server.poll() is None:
+            if os.path.exists(sockpath):
+                break
+            time.sleep(0.1)
+
+    def connect(self):
+        return unixconnection(self.sockpath)
+
+    def shutdown(self):
+        os.kill(self.server.pid, signal.SIGTERM)
+        self.server.wait()
+
+def writeblock(server, data):
+    server.stdin.write(struct.pack('>I', len(data)))
+    server.stdin.write(data)
+    server.stdin.flush()
+
+def readchannel(server):
+    data = server.stdout.read(5)
+    if not data:
+        raise EOFError
+    channel, length = struct.unpack('>cI', data)
+    if channel in 'IL':
+        return channel, length
+    else:
+        return channel, server.stdout.read(length)
+
+def sep(text):
+    return text.replace('\\', '/')
+
+def runcommand(server, args, output=sys.stdout, error=sys.stderr, input=None,
+               outfilter=lambda x: x):
+    print('*** runcommand', ' '.join(args))
+    sys.stdout.flush()
+    server.stdin.write('runcommand\n')
+    writeblock(server, '\0'.join(args))
+
+    if not input:
+        input = stringio()
+
+    while True:
+        ch, data = readchannel(server)
+        if ch == 'o':
+            output.write(outfilter(data))
+            output.flush()
+        elif ch == 'e':
+            error.write(data)
+            error.flush()
+        elif ch == 'I':
+            writeblock(server, input.read(data))
+        elif ch == 'L':
+            writeblock(server, input.readline(data))
+        elif ch == 'r':
+            ret, = struct.unpack('>i', data)
+            if ret != 0:
+                print(' [%d]' % ret)
+            return ret
+        else:
+            print("unexpected channel %c: %r" % (ch, data))
+            if ch.isupper():
+                return
+
+def check(func, connect=connectpipe):
+    sys.stdout.flush()
+    server = connect()
+    try:
+        return func(server)
+    finally:
+        server.stdin.close()
+        server.wait()

contrib/hgk

@@ -0,0 +1,4155 b''
+#!/usr/bin/env wish
+
+# Copyright (C) 2005 Paul Mackerras.  All rights reserved.
+# This program is free software; it may be used, copied, modified
+# and distributed under the terms of the GNU General Public Licence,
+# either version 2, or (at your option) any later version.
+#
+# See hgk.py for extension usage and configuration.
+
+
+# Modified version of Tip 171:
+# http://www.tcl.tk/cgi-bin/tct/tip/171.html
+#
+# The in_mousewheel global was added to fix strange reentrancy issues.
+# The whole snipped is activated only under windows, mouse wheel
+# bindings working already under MacOSX and Linux.
+
+if {[catch {package require Ttk}]} {
+    # use a shim
+    namespace eval ttk {
+        proc style args {}
+
+        proc entry args {
+            eval [linsert $args 0 ::entry] -relief flat
+        }
+    }
+
+    interp alias {} ttk::button {} button
+    interp alias {} ttk::frame {} frame
+    interp alias {} ttk::label {} label
+    interp alias {} ttk::scrollbar {} scrollbar
+    interp alias {} ttk::optionMenu {} tk_optionMenu
+
+    proc updatepalette {} {}
+} else {
+    proc ::ttk::optionMenu {w varName firstValue args} {
+        upvar #0 $varName var
+
+        if {![info exists var]} {
+            set var $firstValue
+        }
+        ttk::menubutton $w -textvariable $varName -menu $w.menu \
+                -direction flush
+        menu $w.menu -tearoff 0
+        $w.menu add radiobutton -label $firstValue -variable $varName
+        foreach i $args {
+            $w.menu add radiobutton -label $i -variable $varName
+        }
+        return $w.menu
+    }
+    proc updatepalette {} {
+        catch {
+            tk_setPalette background [ttk::style lookup client -background]
+        }
+    }
+}
+
+if {[tk windowingsystem] eq "win32"} {
+
+ttk::style theme use xpnative
+
+set mw_classes [list Text Listbox Table TreeCtrl]
+   foreach class $mw_classes { bind $class <MouseWheel> {} }
+
+set in_mousewheel 0
+
+proc ::tk::MouseWheel {wFired X Y D {shifted 0}} {
+    global in_mousewheel
+    if { $in_mousewheel != 0 } { return }
+    # Set event to check based on call
+    set evt "<[expr {$shifted?{Shift-}:{}}]MouseWheel>"
+    # do not double-fire in case the class already has a binding
+    if {[bind [winfo class $wFired] $evt] ne ""} { return }
+    # obtain the window the mouse is over
+    set w [winfo containing $X $Y]
+    # if we are outside the app, try and scroll the focus widget
+    if {![winfo exists $w]} { catch {set w [focus]} }
+    if {[winfo exists $w]} {
+
+        if {[bind $w $evt] ne ""} {
+            # Awkward ... this widget has a MouseWheel binding, but to
+            # trigger successfully in it, we must give it focus.
+            catch {focus} old
+            if {$w ne $old} { focus $w }
+            set in_mousewheel 1
+            event generate $w $evt -rootx $X -rooty $Y -delta $D
+            set in_mousewheel 0
+            if {$w ne $old} { focus $old }
+            return
+        }
+
+        # aqua and x11/win32 have different delta handling
+        if {[tk windowingsystem] ne "aqua"} {
+            set delta [expr {- ($D / 30)}]
+        } else {
+            set delta [expr {- ($D)}]
+        }
+        # scrollbars have different call conventions
+        if {[string match "*Scrollbar" [winfo class $w]]} {
+            catch {tk::ScrollByUnits $w \
+                       [string index [$w cget -orient] 0] $delta}
+        } else {
+            set cmd [list $w [expr {$shifted ? "xview" : "yview"}] \
+                         scroll $delta units]
+            # Walking up to find the proper widget (handles cases like
+            # embedded widgets in a canvas)
+            while {[catch $cmd] && [winfo toplevel $w] ne $w} {
+                set w [winfo parent $w]
+            }
+        }
+    }
+}
+
+bind all <MouseWheel> [list ::tk::MouseWheel %W %X %Y %D 0]
+
+# end of win32 section
+} else {
+
+if {[catch {
+    set theme [ttk::style theme use]
+}]} {
+    set theme $::ttk::currentTheme
+}
+if {$theme eq "default"} {
+    ttk::style theme use clam
+}
+
+}
+
+updatepalette
+
+# Unify right mouse button handling.
+# See "mouse buttons on macintosh" thread on comp.lang.tcl
+if {[tk windowingsystem] eq "aqua"} {
+    event add <<B3>> <Control-ButtonPress-1>
+    event add <<B3>> <Button-2>
+} else {
+    event add <<B3>> <Button-3>
+}
+
+proc gitdir {} {
+    global env
+    if {[info exists env(GIT_DIR)]} {
+	return $env(GIT_DIR)
+    } else {
+	return ".hg"
+    }
+}
+
+proc popupify {w} {
+    wm resizable $w 0 0
+    wm withdraw $w
+    update
+    set x [expr {([winfo screenwidth .]-[winfo reqwidth $w])/2}]
+    set y [expr {([winfo screenheight .]-[winfo reqheight $w])/2}]
+    wm geometry  $w +$x+$y
+    wm transient $w .
+    wm deiconify $w
+    wm resizable $w 1 1
+}
+
+proc getcommits {rargs} {
+    global commits commfd phase canv mainfont env
+    global startmsecs nextupdate ncmupdate
+    global ctext maincursor textcursor leftover
+
+    # check that we can find a .git directory somewhere...
+    set gitdir [gitdir]
+    if {![file isdirectory $gitdir]} {
+	error_popup "Cannot find the git directory \"$gitdir\"."
+	exit 1
+    }
+    set commits {}
+    set phase getcommits
+    set startmsecs [clock clicks -milliseconds]
+    set nextupdate [expr $startmsecs + 100]
+    set ncmupdate 1
+    set limit 0
+    set revargs {}
+    set showhidden no
+    for {set i 0} {$i < [llength $rargs]} {incr i} {
+	set opt [lindex $rargs $i]
+	switch -- $opt --limit {
+	    incr i
+	    set limit [lindex $rargs $i]
+	} --hidden {
+	    set showhidden yes
+	} default {
+	    lappend revargs $opt
+	}
+    }
+    if [catch {
+	set parse_args [concat tip $revargs]
+	set parse_temp [eval exec {$env(HG)} --config ui.report_untrusted=false log --template '{node}\n' $parse_args]
+	regsub -all "\r\n" $parse_temp "\n" parse_temp
+	set parsed_args [split $parse_temp "\n"]
+    } err] {
+	# if git-rev-parse failed for some reason...
+	if {$rargs == {}} {
+	    set revargs HEAD
+	}
+	set parsed_args $revargs
+    }
+    if {$limit > 0} {
+	set parsed_args [concat -n $limit $parsed_args]
+    }
+    if {$showhidden} {
+	append parsed_args --hidden
+    }
+    if [catch {
+	set commfd [open "|{$env(HG)} --config ui.report_untrusted=false debug-rev-list --header --topo-order --parents $parsed_args" r]
+    } err] {
+	puts stderr "Error executing hg debug-rev-list: $err"
+	exit 1
+    }
+    set leftover {}
+    fconfigure $commfd -blocking 0 -translation lf -eofchar {}
+    fileevent $commfd readable [list getcommitlines $commfd]
+    $canv delete all
+    $canv create text 3 3 -anchor nw -text "Reading commits..." \
+	-font $mainfont -tags textitems
+    . config -cursor watch
+    settextcursor watch
+}
+
+proc getcommitlines {commfd}  {
+    global commits parents cdate children
+    global commitlisted phase commitinfo nextupdate
+    global stopped redisplaying leftover
+
+    set stuff [read $commfd]
+    if {$stuff == {}} {
+	if {![eof $commfd]} return
+	# set it blocking so we wait for the process to terminate
+	fconfigure $commfd -blocking 1
+	if {![catch {close $commfd} err]} {
+	    after idle finishcommits
+	    return
+	}
+	if {[string range $err 0 4] == "usage"} {
+	    set err \
+{Gitk: error reading commits: bad arguments to git-rev-list.
+(Note: arguments to gitk are passed to git-rev-list
+to allow selection of commits to be displayed.)}
+	} else {
+	    set err "Error reading commits: $err"
+	}
+	error_popup $err
+	exit 1
+    }
+    set start 0
+    while 1 {
+	set i [string first "\0" $stuff $start]
+	if {$i < 0} {
+	    append leftover [string range $stuff $start end]
+	    return
+	}
+	set cmit [string range $stuff $start [expr {$i - 1}]]
+	if {$start == 0} {
+	    set cmit "$leftover$cmit"
+	    set leftover {}
+	}
+	set start [expr {$i + 1}]
+	regsub -all "\r\n" $cmit "\n" cmit
+	set j [string first "\n" $cmit]
+	set ok 0
+	if {$j >= 0} {
+	    set ids [string range $cmit 0 [expr {$j - 1}]]
+	    set ok 1
+	    foreach id $ids {
+		if {![regexp {^[0-9a-f]{12}$} $id]} {
+		    set ok 0
+		    break
+		}
+	    }
+	}
+	if {!$ok} {
+	    set shortcmit $cmit
+	    if {[string length $shortcmit] > 80} {
+		set shortcmit "[string range $shortcmit 0 80]..."
+	    }
+	    error_popup "Can't parse hg debug-rev-list output: {$shortcmit}"
+	    exit 1
+	}
+	set id [lindex $ids 0]
+	set olds [lrange $ids 1 end]
+	set cmit [string range $cmit [expr {$j + 1}] end]
+	lappend commits $id
+	set commitlisted($id) 1
+	parsecommit $id $cmit 1 [lrange $ids 1 end]
+	drawcommit $id
+	if {[clock clicks -milliseconds] >= $nextupdate} {
+	    doupdate 1
+	}
+	while {$redisplaying} {
+	    set redisplaying 0
+	    if {$stopped == 1} {
+		set stopped 0
+		set phase "getcommits"
+		foreach id $commits {
+		    drawcommit $id
+		    if {$stopped} break
+		    if {[clock clicks -milliseconds] >= $nextupdate} {
+			doupdate 1
+		    }
+		}
+	    }
+	}
+    }
+}
+
+proc doupdate {reading} {
+    global commfd nextupdate numcommits ncmupdate
+
+    if {$reading} {
+	fileevent $commfd readable {}
+    }
+    update
+    set nextupdate [expr {[clock clicks -milliseconds] + 100}]
+    if {$numcommits < 100} {
+	set ncmupdate [expr {$numcommits + 1}]
+    } elseif {$numcommits < 10000} {
+	set ncmupdate [expr {$numcommits + 10}]
+    } else {
+	set ncmupdate [expr {$numcommits + 100}]
+    }
+    if {$reading} {
+	fileevent $commfd readable [list getcommitlines $commfd]
+    }
+}
+
+proc readcommit {id} {
+    global env
+    if [catch {set contents [exec $env(HG) --config ui.report_untrusted=false debug-cat-file commit $id]}] return
+    parsecommit $id $contents 0 {}
+}
+
+proc parsecommit {id contents listed olds} {
+    global commitinfo children nchildren parents nparents cdate ncleft
+    global firstparents obsolete
+
+    set inhdr 1
+    set comment {}
+    set headline {}
+    set auname {}
+    set audate {}
+    set comname {}
+    set comdate {}
+    set rev {}
+    set branch {}
+    set bookmark {}
+    if {![info exists nchildren($id)]} {
+	set children($id) {}
+	set nchildren($id) 0
+	set ncleft($id) 0
+    }
+    set parents($id) $olds
+    set nparents($id) [llength $olds]
+    foreach p $olds {
+	if {![info exists nchildren($p)]} {
+	    set children($p) [list $id]
+	    set nchildren($p) 1
+	    set ncleft($p) 1
+	} elseif {[lsearch -exact $children($p) $id] < 0} {
+	    lappend children($p) $id
+	    incr nchildren($p)
+	    incr ncleft($p)
+	}
+    }
+    regsub -all "\r\n" $contents "\n" contents
+    foreach line [split $contents "\n"] {
+	if {$inhdr} {
+	    set line [split $line]
+	    if {$line == {}} {
+		set inhdr 0
+	    } else {
+		set tag [lindex $line 0]
+		switch -- $tag "author" {
+		    set x [expr {[llength $line] - 2}]
+		    set audate [lindex $line $x]
+		    set auname [join [lrange $line 1 [expr {$x - 1}]]]
+		} "committer" {
+		    set x [expr {[llength $line] - 2}]
+		    set comdate [lindex $line $x]
+		    set comname [join [lrange $line 1 [expr {$x - 1}]]]
+		} "revision" {
+		    set rev [lindex $line 1]
+		} "branch" {
+		    set branch [join [lrange $line 1 end]]
+		} "bookmark" {
+		    set bookmark [join [lrange $line 1 end]]
+		} "obsolete" {
+		    set obsolete($id) ""
+		} "phase" {
+		    set phase [lindex $line 1 end]
+		}
+	    }
+	} else {
+	    if {$comment == {}} {
+		set headline [string trim $line]
+	    } else {
+		append comment "\n"
+	    }
+	    if {!$listed} {
+		# git-rev-list indents the comment by 4 spaces;
+		# if we got this via git-cat-file, add the indentation
+		append comment "    "
+	    }
+	    append comment $line
+	}
+    }
+    if {$audate != {}} {
+	set audate [clock format $audate]
+    }
+    if {$comdate != {}} {
+	set cdate($id) $comdate
+	set comdate [clock format $comdate]
+    }
+    set commitinfo($id) [list $headline $auname $audate \
+			     $comname $comdate $comment $rev $branch $bookmark $phase]
+
+    if {[info exists firstparents]} {
+        set i [lsearch $firstparents $id]
+        if {$i != -1} {
+            # remove the parent from firstparents, possible building
+            # an empty list
+            set firstparents [concat \
+                                  [lrange $firstparents 0 [expr $i - 1]] \
+                                  [lrange $firstparents [expr $i + 1] end]]
+            if {$firstparents eq {}} {
+                # we have found all parents of the first changeset
+                # which means that we can safely select the first line
+                after idle {
+                    selectline 0 0
+                }
+            }
+        }
+    } else {
+        # this is the first changeset, save the parents
+        set firstparents $olds
+        if {$firstparents eq {}} {
+            # a repository with a single changeset
+            after idle {
+                selectline 0 0
+            }
+        }
+    }
+}
+
+proc readrefs {} {
+    global bookmarkcurrent bookmarkids tagids idtags idbookmarks headids idheads tagcontents env curid
+
+    set status [catch {exec $env(HG) --config ui.report_untrusted=false id} curid]
+    if { $status != 0 } {
+        puts $::errorInfo
+        if { ![string equal $::errorCode NONE] } {
+            exit 2
+        }
+    }
+    regexp -- {[[:xdigit:]]+} $curid curid
+
+    set status [catch {exec $env(HG) --config ui.report_untrusted=false tags} tags]
+    if { $status != 0 } {
+        puts $::errorInfo
+        if { ![string equal $::errorCode NONE] } {
+            exit 2
+        }
+    }
+
+    foreach {- tag rev id} [regexp -inline -all -line {^(.+\S)\s+(\d+):(\S+)} $tags] {
+        # we use foreach as Tcl8.4 doesn't support lassign
+        lappend tagids($tag) $id
+        lappend idtags($id) $tag
+    }
+
+    set status [catch {exec $env(HG) --config ui.report_untrusted=false heads} heads]
+    if { $status != 0 } {
+        puts $::errorInfo
+        if { ![string equal $::errorCode NONE] } {
+            exit 2
+        }
+    }
+
+    set lines [split $heads \r\n]
+    foreach f $lines {
+        set match ""
+        regexp {changeset:\s+(\S+):(\S+)$} $f match id sha
+        if {$match != ""} {
+        lappend idheads($sha) $id
+        }
+    }
+
+    set status [catch {exec $env(HG) --config ui.report_untrusted=false bookmarks} bookmarks]
+    if { $status != 0 } {
+        puts $::errorInfo
+        if { ![string equal $::errorCode NONE] } {
+            exit 2
+        }
+    }
+    set lines [split $bookmarks "\n"]
+    set bookmarkcurrent 0
+    foreach f $lines {
+	regexp {(\S+)$} $f full
+	regsub {\s+(\S+)$} $f "" direct
+	set sha [split $full ':']
+	set bookmark [lindex $sha 1]
+	set current [string first " * " $direct)]
+	regsub {^\s(\*|\s)\s} $direct "" direct
+	lappend bookmarkids($direct) $bookmark
+	lappend idbookmarks($bookmark) $direct
+	if {$current >= 0} {
+		set bookmarkcurrent $direct
+	}
+    }
+}
+
+proc readotherrefs {base dname excl} {
+    global otherrefids idotherrefs
+
+    set git [gitdir]
+    set files [glob -nocomplain -types f [file join $git $base *]]
+    foreach f $files {
+	catch {
+	    set fd [open $f r]
+	    set line [read $fd 40]
+	    if {[regexp {^[0-9a-f]{12}} $line id]} {
+		set name "$dname[file tail $f]"
+		set otherrefids($name) $id
+		lappend idotherrefs($id) $name
+	    }
+	    close $fd
+	}
+    }
+    set dirs [glob -nocomplain -types d [file join $git $base *]]
+    foreach d $dirs {
+	set dir [file tail $d]
+	if {[lsearch -exact $excl $dir] >= 0} continue
+	readotherrefs [file join $base $dir] "$dname$dir/" {}
+    }
+}
+
+proc allcansmousewheel {delta} {
+    set delta [expr -5*(int($delta)/abs($delta))]
+    allcanvs yview scroll $delta units
+}
+
+proc error_popup msg {
+    set w .error
+    toplevel $w
+    wm transient $w .
+    message $w.m -text $msg -justify center -aspect 400
+    pack $w.m -side top -fill x -padx 20 -pady 20
+    ttk::button $w.ok -text OK -command "destroy $w"
+    pack $w.ok -side bottom -fill x
+    bind $w <Visibility> "grab $w; focus $w"
+    popupify $w
+    tkwait window $w
+}
+
+proc makewindow {} {
+    global canv canv2 canv3 linespc charspc ctext cflist textfont
+    global findtype findtypemenu findloc findstring fstring geometry
+    global entries sha1entry sha1string sha1but
+    global maincursor textcursor curtextcursor
+    global rowctxmenu gaudydiff mergemax
+    global hgvdiff bgcolor fgcolor diffremcolor diffaddcolor diffmerge1color
+    global diffmerge2color hunksepcolor
+    global posx posy
+
+    if {[info exists posx]} {
+        wm geometry . +$posx+$posy
+    }
+
+    menu .bar
+    .bar add cascade -label "File" -menu .bar.file
+    menu .bar.file
+    .bar.file add command -label "Reread references" -command rereadrefs
+    .bar.file add command -label "Quit" -command doquit
+    menu .bar.help
+    .bar add cascade -label "Help" -menu .bar.help
+    .bar.help add command -label "About hgk" -command about
+    . configure -menu .bar
+
+    if {![info exists geometry(canv1)]} {
+	set geometry(canv1) [expr 45 * $charspc]
+	set geometry(canv2) [expr 30 * $charspc]
+	set geometry(canv3) [expr 15 * $charspc]
+	set geometry(canvh) [expr 25 * $linespc + 4]
+	set geometry(ctextw) 80
+	set geometry(ctexth) 30
+	set geometry(cflistw) 30
+    }
+    panedwindow .ctop -orient vertical
+    if {[info exists geometry(width)]} {
+	.ctop conf -width $geometry(width) -height $geometry(height)
+	set texth [expr {$geometry(height) - $geometry(canvh) - 56}]
+	set geometry(ctexth) [expr {($texth - 8) /
+				    [font metrics $textfont -linespace]}]
+    }
+    ttk::frame .ctop.top
+    ttk::frame .ctop.top.bar
+    pack .ctop.top.bar -side bottom -fill x
+    set cscroll .ctop.top.csb
+    ttk::scrollbar $cscroll -command {allcanvs yview}
+    pack $cscroll -side right -fill y
+    panedwindow .ctop.top.clist -orient horizontal -sashpad 0 -handlesize 4
+    pack .ctop.top.clist -side top -fill both -expand 1
+    .ctop add .ctop.top
+    set canv .ctop.top.clist.canv
+    canvas $canv -height $geometry(canvh) -width $geometry(canv1) \
+	-bg $bgcolor -bd 0 \
+	-yscrollincr $linespc -yscrollcommand "$cscroll set" -selectbackground "#c0c0c0"
+    .ctop.top.clist add $canv
+    set canv2 .ctop.top.clist.canv2
+    canvas $canv2 -height $geometry(canvh) -width $geometry(canv2) \
+	-bg $bgcolor -bd 0 -yscrollincr $linespc -selectbackground "#c0c0c0"
+    .ctop.top.clist add $canv2
+    set canv3 .ctop.top.clist.canv3
+    canvas $canv3 -height $geometry(canvh) -width $geometry(canv3) \
+	-bg $bgcolor -bd 0 -yscrollincr $linespc -selectbackground "#c0c0c0"
+    .ctop.top.clist add $canv3
+    bind .ctop.top.clist <Configure> {resizeclistpanes %W %w}
+
+    set sha1entry .ctop.top.bar.sha1
+    set entries $sha1entry
+    set sha1but .ctop.top.bar.sha1label
+    button $sha1but -text "SHA1 ID: " -state disabled -relief flat \
+	-command gotocommit -width 8
+    $sha1but conf -disabledforeground [$sha1but cget -foreground]
+    pack .ctop.top.bar.sha1label -side left
+    ttk::entry $sha1entry -width 40 -font $textfont -textvariable sha1string
+    trace add variable sha1string write sha1change
+    pack $sha1entry -side left -pady 2
+
+    image create bitmap bm-left -data {
+	#define left_width 16
+	#define left_height 16
+	static unsigned char left_bits[] = {
+	0x00, 0x00, 0xc0, 0x01, 0xe0, 0x00, 0x70, 0x00, 0x38, 0x00, 0x1c, 0x00,
+	0x0e, 0x00, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x0e, 0x00, 0x1c, 0x00,
+	0x38, 0x00, 0x70, 0x00, 0xe0, 0x00, 0xc0, 0x01};
+    }
+    image create bitmap bm-right -data {
+	#define right_width 16
+	#define right_height 16
+	static unsigned char right_bits[] = {
+	0x00, 0x00, 0xc0, 0x01, 0x80, 0x03, 0x00, 0x07, 0x00, 0x0e, 0x00, 0x1c,
+	0x00, 0x38, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x00, 0x38, 0x00, 0x1c,
+	0x00, 0x0e, 0x00, 0x07, 0x80, 0x03, 0xc0, 0x01};
+    }
+    ttk::button .ctop.top.bar.leftbut -image bm-left -command goback \
+	-state disabled -width 26
+    pack .ctop.top.bar.leftbut -side left -fill y
+    ttk::button .ctop.top.bar.rightbut -image bm-right -command goforw \
+	-state disabled -width 26
+    pack .ctop.top.bar.rightbut -side left -fill y
+
+    ttk::button .ctop.top.bar.findbut -text "Find" -command dofind
+    pack .ctop.top.bar.findbut -side left
+    set findstring {}
+    set fstring .ctop.top.bar.findstring
+    lappend entries $fstring
+    ttk::entry $fstring -width 30 -font $textfont -textvariable findstring
+    pack $fstring -side left -expand 1 -fill x
+    set findtype Exact
+    set findtypemenu [ttk::optionMenu .ctop.top.bar.findtype \
+			  findtype Exact IgnCase Regexp]
+    set findloc "All fields"
+    ttk::optionMenu .ctop.top.bar.findloc findloc "All fields" Headline \
+	Comments Author Files Pickaxe
+    pack .ctop.top.bar.findloc -side right
+    pack .ctop.top.bar.findtype -side right
+    # for making sure type==Exact whenever loc==Pickaxe
+    trace add variable findloc write findlocchange
+
+    panedwindow .ctop.cdet -orient horizontal
+    .ctop add .ctop.cdet
+    ttk::frame .ctop.cdet.left
+    set ctext .ctop.cdet.left.ctext
+    text $ctext -fg $fgcolor -bg $bgcolor -state disabled -font $textfont \
+	-width $geometry(ctextw) -height $geometry(ctexth) \
+	-yscrollcommand ".ctop.cdet.left.sb set" \
+	-xscrollcommand ".ctop.cdet.left.hb set" -wrap none
+    ttk::scrollbar .ctop.cdet.left.sb -command "$ctext yview"
+    ttk::scrollbar .ctop.cdet.left.hb -orient horizontal -command "$ctext xview"
+    pack .ctop.cdet.left.sb -side right -fill y
+    pack .ctop.cdet.left.hb -side bottom -fill x
+    pack $ctext -side left -fill both -expand 1
+    .ctop.cdet add .ctop.cdet.left
+
+    $ctext tag conf filesep -font [concat $textfont bold] -back "#aaaaaa"
+    if {$gaudydiff} {
+	$ctext tag conf hunksep -back blue -fore white
+	$ctext tag conf d0 -back "#ff8080"
+	$ctext tag conf d1 -back green
+    } else {
+	$ctext tag conf hunksep -fore $hunksepcolor
+	$ctext tag conf d0 -fore $diffremcolor
+	$ctext tag conf d1 -fore $diffaddcolor
+
+	# The mX colours seem to be used in merge changesets, where m0
+	# is first parent, m1 is second parent and so on. Git can have
+	# several parents, Hg cannot, so I think the m2..mmax would be
+	# unused.
+	$ctext tag conf m0 -fore $diffmerge1color
+	$ctext tag conf m1 -fore $diffmerge2color
+	$ctext tag conf m2 -fore green
+	$ctext tag conf m3 -fore purple
+	$ctext tag conf m4 -fore brown
+	$ctext tag conf mmax -fore darkgrey
+	set mergemax 5
+	$ctext tag conf mresult -font [concat $textfont bold]
+	$ctext tag conf msep -font [concat $textfont bold]
+	$ctext tag conf found -back yellow
+    }
+
+    ttk::frame .ctop.cdet.right
+    set cflist .ctop.cdet.right.cfiles
+    listbox $cflist -fg $fgcolor -bg $bgcolor \
+        -selectmode extended -width $geometry(cflistw) \
+	-yscrollcommand ".ctop.cdet.right.sb set"
+    ttk::scrollbar .ctop.cdet.right.sb -command "$cflist yview"
+    pack .ctop.cdet.right.sb -side right -fill y
+    pack $cflist -side left -fill both -expand 1
+    .ctop.cdet add .ctop.cdet.right
+    bind .ctop.cdet <Configure> {resizecdetpanes %W %w}
+
+    pack .ctop -side top -fill both -expand 1
+
+    bindall <1> {selcanvline %W %x %y}
+    #bindall <B1-Motion> {selcanvline %W %x %y}
+    bindall <MouseWheel> "allcansmousewheel %D"
+    bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
+    bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
+    bindall <2> "allcanvs scan mark 0 %y"
+    bindall <B2-Motion> "allcanvs scan dragto 0 %y"
+    bind . <Key-Up> "selnextline -1"
+    bind . <Key-Down> "selnextline 1"
+    bind . <Key-Prior> "allcanvs yview scroll -1 pages"
+    bind . <Key-Next> "allcanvs yview scroll 1 pages"
+    bindkey <Key-Delete> "$ctext yview scroll -1 pages"
+    bindkey <Key-BackSpace> "$ctext yview scroll -1 pages"
+    bindkey <Key-space> "$ctext yview scroll 1 pages"
+    bindkey p "selnextline -1"
+    bindkey n "selnextline 1"
+    bindkey b "$ctext yview scroll -1 pages"
+    bindkey d "$ctext yview scroll 18 units"
+    bindkey u "$ctext yview scroll -18 units"
+    bindkey / {findnext 1}
+    bindkey <Key-Return> {findnext 0}
+    bindkey ? findprev
+    bindkey f nextfile
+    bind . <Control-q> doquit
+    bind . <Control-w> doquit
+    bind . <Control-f> dofind
+    bind . <Control-g> {findnext 0}
+    bind . <Control-r> findprev
+    bind . <Control-equal> {incrfont 1}
+    bind . <Control-KP_Add> {incrfont 1}
+    bind . <Control-minus> {incrfont -1}
+    bind . <Control-KP_Subtract> {incrfont -1}
+    bind $cflist <<ListboxSelect>> listboxsel
+    bind . <Destroy> {savestuff %W}
+    bind . <Button-1> "click %W"
+    bind $fstring <Key-Return> dofind
+    bind $sha1entry <Key-Return> gotocommit
+    bind $sha1entry <<PasteSelection>> clearsha1
+
+    set maincursor [. cget -cursor]
+    set textcursor [$ctext cget -cursor]
+    set curtextcursor $textcursor
+
+    set rowctxmenu .rowctxmenu
+    menu $rowctxmenu -tearoff 0
+    $rowctxmenu add command -label "Diff this -> selected" \
+	-command {diffvssel 0}
+    $rowctxmenu add command -label "Diff selected -> this" \
+	-command {diffvssel 1}
+    $rowctxmenu add command -label "Make patch" -command mkpatch
+    $rowctxmenu add command -label "Create tag" -command mktag
+    $rowctxmenu add command -label "Write commit to file" -command writecommit
+    if { $hgvdiff ne "" } {
+	$rowctxmenu add command -label "Visual diff with parent" \
+	    -command {vdiff 1}
+	$rowctxmenu add command -label "Visual diff with selected" \
+	    -command {vdiff 0}
+    }
+}
+
+# when we make a key binding for the toplevel, make sure
+# it doesn't get triggered when that key is pressed in the
+# find string entry widget.
+proc bindkey {ev script} {
+    global entries
+    bind . $ev $script
+    set escript [bind Entry $ev]
+    if {$escript == {}} {
+	set escript [bind Entry <Key>]
+    }
+    foreach e $entries {
+	bind $e $ev "$escript; break"
+    }
+}
+
+# set the focus back to the toplevel for any click outside
+# the entry widgets
+proc click {w} {
+    global ctext entries
+    foreach e [concat $entries $ctext] {
+	if {$w == $e} return
+    }
+    focus .
+}
+
+proc savestuff {w} {
+    global canv canv2 canv3 ctext cflist mainfont textfont
+    global stuffsaved findmergefiles gaudydiff maxgraphpct
+    global maxwidth authorcolors curidfont bgcolor fgcolor
+    global diffremcolor diffaddcolor hunksepcolor
+    global diffmerge1color diffmerge2color
+
+    if {$stuffsaved} return
+    if {![winfo viewable .]} return
+    catch {
+	set f [open "~/.hgk-new" w]
+	puts $f [list set mainfont $mainfont]
+	puts $f [list set curidfont $curidfont]
+	puts $f [list set textfont $textfont]
+	puts $f [list set findmergefiles $findmergefiles]
+	puts $f [list set gaudydiff $gaudydiff]
+	puts $f [list set maxgraphpct $maxgraphpct]
+	puts $f [list set maxwidth $maxwidth]
+	puts $f "set geometry(width) [winfo width .ctop]"
+	puts $f "set geometry(height) [winfo height .ctop]"
+	puts $f "set geometry(canv1) [expr [winfo width $canv]-2]"
+	puts $f "set geometry(canv2) [expr [winfo width $canv2]-2]"
+	puts $f "set geometry(canv3) [expr [winfo width $canv3]-2]"
+	puts $f "set geometry(canvh) [expr [winfo height $canv]-2]"
+	set wid [expr {([winfo width $ctext] - 8) \
+			   / [font measure $textfont "0"]}]
+	puts $f "set geometry(ctextw) $wid"
+	set wid [expr {([winfo width $cflist] - 11) \
+			   / [font measure [$cflist cget -font] "0"]}]
+	puts $f "set geometry(cflistw) $wid"
+	puts $f "#"
+	puts $f "# main window position:"
+	puts $f "set posx [winfo x .]"
+	puts $f "set posy [winfo y .]"
+	puts $f "#"
+	puts $f "# authorcolors format:"
+	puts $f "#"
+	puts $f "# zero or more sublists of"
+	puts $f "#"
+	puts $f "#    { regex color }"
+	puts $f "#"
+	puts $f "# followed by a list of colors"
+	puts $f "#"
+	puts $f "# If the commit author matches a regex in a sublist,"
+	puts $f "# the commit will be colored by that color"
+	puts $f "# otherwise the next unused entry from the list of colors"
+	puts $f "# will be assigned to this commit and also all other commits"
+	puts $f "# of the same author.  When the list of colors is exhausted,"
+	puts $f "# the last entry will be reused."
+	puts $f "#"
+	puts $f "set authorcolors {$authorcolors}"
+	puts $f "#"
+	puts $f "# The background color in the text windows"
+	puts $f "set bgcolor $bgcolor"
+	puts $f "#"
+	puts $f "# The text color used in the diff and file list view"
+	puts $f "set fgcolor $fgcolor"
+	puts $f "#"
+	puts $f "# Color to display + lines in diffs"
+	puts $f "set diffaddcolor $diffaddcolor"
+	puts $f "#"
+	puts $f "# Color to display - lines in diffs"
+	puts $f "set diffremcolor $diffremcolor"
+	puts $f "#"
+	puts $f "# Merge diffs: Color to signal lines from first parent"
+	puts $f "set diffmerge1color $diffmerge1color"
+	puts $f "#"
+	puts $f "# Merge diffs: Color to signal lines from second parent"
+	puts $f "set diffmerge2color $diffmerge2color"
+	puts $f "#"
+	puts $f "# Hunkseparator (@@ -lineno,lines +lineno,lines @@) color"
+	puts $f "set hunksepcolor $hunksepcolor"
+	close $f
+	file rename -force "~/.hgk-new" "~/.hgk"
+    }
+    set stuffsaved 1
+}
+
+proc resizeclistpanes {win w} {
+    global oldwidth
+    if [info exists oldwidth($win)] {
+	set s0 [$win sash coord 0]
+	set s1 [$win sash coord 1]
+	if {$w < 60} {
+	    set sash0 [expr {int($w/2 - 2)}]
+	    set sash1 [expr {int($w*5/6 - 2)}]
+	} else {
+	    set factor [expr {1.0 * $w / $oldwidth($win)}]
+	    set sash0 [expr {int($factor * [lindex $s0 0])}]
+	    set sash1 [expr {int($factor * [lindex $s1 0])}]
+	    if {$sash0 < 30} {
+		set sash0 30
+	    }
+	    if {$sash1 < $sash0 + 20} {
+		set sash1 [expr $sash0 + 20]
+	    }
+	    if {$sash1 > $w - 10} {
+		set sash1 [expr $w - 10]
+		if {$sash0 > $sash1 - 20} {
+		    set sash0 [expr $sash1 - 20]
+		}
+	    }
+	}
+	$win sash place 0 $sash0 [lindex $s0 1]
+	$win sash place 1 $sash1 [lindex $s1 1]
+    }
+    set oldwidth($win) $w
+}
+
+proc resizecdetpanes {win w} {
+    global oldwidth
+    if [info exists oldwidth($win)] {
+	set s0 [$win sash coord 0]
+	if {$w < 60} {
+	    set sash0 [expr {int($w*3/4 - 2)}]
+	} else {
+	    set factor [expr {1.0 * $w / $oldwidth($win)}]
+	    set sash0 [expr {int($factor * [lindex $s0 0])}]
+	    if {$sash0 < 45} {
+		set sash0 45
+	    }
+	    if {$sash0 > $w - 15} {
+		set sash0 [expr $w - 15]
+	    }
+	}
+	$win sash place 0 $sash0 [lindex $s0 1]
+    }
+    set oldwidth($win) $w
+}
+
+proc allcanvs args {
+    global canv canv2 canv3
+    eval $canv $args
+    eval $canv2 $args
+    eval $canv3 $args
+}
+
+proc bindall {event action} {
+    global canv canv2 canv3
+    bind $canv $event $action
+    bind $canv2 $event $action
+    bind $canv3 $event $action
+}
+
+proc about {} {
+    set w .about
+    if {[winfo exists $w]} {
+	raise $w
+	return
+    }
+    toplevel $w
+    wm title $w "About hgk"
+    message $w.m -text {
+Hgk version 1.2
+
+Copyright � 2005 Paul Mackerras
+
+Use and redistribute under the terms of the GNU General Public License} \
+	    -justify center -aspect 400
+    pack $w.m -side top -fill x -padx 20 -pady 20
+    ttk::button $w.ok -text Close -command "destroy $w"
+    pack $w.ok -side bottom
+    popupify $w
+}
+
+set aunextcolor 0
+proc assignauthorcolor {name} {
+    global authorcolors aucolormap aunextcolor
+    if [info exists aucolormap($name)] return
+
+    set randomcolors {black}
+    for {set i 0} {$i < [llength $authorcolors]} {incr i} {
+	set col [lindex $authorcolors $i]
+	if {[llength $col] > 1} {
+	    set re [lindex $col 0]
+	    set c [lindex $col 1]
+	    if {[regexp -- $re $name]} {
+		set aucolormap($name) $c
+		return
+	    }
+	} else {
+	    set randomcolors [lrange $authorcolors $i end]
+	    break
+	}
+    }
+
+    set ncolors [llength $randomcolors]
+    set c [lindex $randomcolors $aunextcolor]
+    if {[incr aunextcolor] >= $ncolors} {
+	incr aunextcolor -1
+    }
+    set aucolormap($name) $c
+}
+
+proc assigncolor {id} {
+    global commitinfo colormap commcolors colors nextcolor
+    global parents nparents children nchildren
+    global cornercrossings crossings
+
+    if [info exists colormap($id)] return
+    set ncolors [llength $colors]
+    if {$nparents($id) <= 1 && $nchildren($id) == 1} {
+	set child [lindex $children($id) 0]
+	if {[info exists colormap($child)]
+	    && $nparents($child) == 1} {
+	    set colormap($id) $colormap($child)
+	    return
+	}
+    }
+    set badcolors {}
+    if {[info exists cornercrossings($id)]} {
+	foreach x $cornercrossings($id) {
+	    if {[info exists colormap($x)]
+		&& [lsearch -exact $badcolors $colormap($x)] < 0} {
+		lappend badcolors $colormap($x)
+	    }
+	}
+	if {[llength $badcolors] >= $ncolors} {
+	    set badcolors {}
+	}
+    }
+    set origbad $badcolors
+    if {[llength $badcolors] < $ncolors - 1} {
+	if {[info exists crossings($id)]} {
+	    foreach x $crossings($id) {
+		if {[info exists colormap($x)]
+		    && [lsearch -exact $badcolors $colormap($x)] < 0} {
+		    lappend badcolors $colormap($x)
+		}
+	    }
+	    if {[llength $badcolors] >= $ncolors} {
+		set badcolors $origbad
+	    }
+	}
+	set origbad $badcolors
+    }
+    if {[llength $badcolors] < $ncolors - 1} {
+	foreach child $children($id) {
+	    if {[info exists colormap($child)]
+		&& [lsearch -exact $badcolors $colormap($child)] < 0} {
+		lappend badcolors $colormap($child)
+	    }
+	    if {[info exists parents($child)]} {
+		foreach p $parents($child) {
+		    if {[info exists colormap($p)]
+			&& [lsearch -exact $badcolors $colormap($p)] < 0} {
+			lappend badcolors $colormap($p)
+		    }
+		}
+	    }
+	}
+	if {[llength $badcolors] >= $ncolors} {
+	    set badcolors $origbad
+	}
+    }
+    for {set i 0} {$i <= $ncolors} {incr i} {
+	set c [lindex $colors $nextcolor]
+	if {[incr nextcolor] >= $ncolors} {
+	    set nextcolor 0
+	}
+	if {[lsearch -exact $badcolors $c]} break
+    }
+    set colormap($id) $c
+}
+
+proc initgraph {} {
+    global canvy canvy0 lineno numcommits nextcolor linespc
+    global mainline mainlinearrow sidelines
+    global nchildren ncleft
+    global displist nhyperspace
+
+    allcanvs delete all
+    set nextcolor 0
+    set canvy $canvy0
+    set lineno -1
+    set numcommits 0
+    catch {unset mainline}
+    catch {unset mainlinearrow}
+    catch {unset sidelines}
+    foreach id [array names nchildren] {
+	set ncleft($id) $nchildren($id)
+    }
+    set displist {}
+    set nhyperspace 0
+}
+
+proc bindline {t id} {
+    global canv
+
+    $canv bind $t <Enter> "lineenter %x %y $id"
+    $canv bind $t <Motion> "linemotion %x %y $id"
+    $canv bind $t <Leave> "lineleave $id"
+    $canv bind $t <Button-1> "lineclick %x %y $id 1"
+}
+
+proc drawlines {id xtra} {
+    global mainline mainlinearrow sidelines lthickness colormap canv
+
+    $canv delete lines.$id
+    if {[info exists mainline($id)]} {
+	set t [$canv create line $mainline($id) \
+		   -width [expr {($xtra + 1) * $lthickness}] \
+		   -fill $colormap($id) -tags lines.$id \
+		   -arrow $mainlinearrow($id)]
+	$canv lower $t
+	bindline $t $id
+    }
+    if {[info exists sidelines($id)]} {
+	foreach ls $sidelines($id) {
+	    set coords [lindex $ls 0]
+	    set thick [lindex $ls 1]
+	    set arrow [lindex $ls 2]
+	    set t [$canv create line $coords -fill $colormap($id) \
+		       -width [expr {($thick + $xtra) * $lthickness}] \
+		       -arrow $arrow -tags lines.$id]
+	    $canv lower $t
+	    bindline $t $id
+	}
+    }
+}
+
+# level here is an index in displist
+proc drawcommitline {level} {
+    global parents children nparents displist
+    global canv canv2 canv3 mainfont namefont canvy linespc
+    global lineid linehtag linentag linedtag commitinfo
+    global colormap numcommits currentparents dupparents
+    global idtags idline idheads idotherrefs idbookmarks
+    global lineno lthickness mainline mainlinearrow sidelines
+    global commitlisted rowtextx idpos lastuse displist
+    global oldnlines olddlevel olddisplist
+    global aucolormap curid curidfont obsolete
+
+    incr numcommits
+    incr lineno
+    set id [lindex $displist $level]
+    set lastuse($id) $lineno
+    set lineid($lineno) $id
+    set idline($id) $lineno
+    set shape oval
+    set outline #000080
+    set ofill [expr {[info exists commitlisted($id)]? "#7f7fff": "white"}]
+    if {![info exists commitinfo($id)]} {
+	readcommit $id
+	if {![info exists commitinfo($id)]} {
+	    set commitinfo($id) {"No commit information available"}
+	    set nparents($id) 0
+	}
+    } else {
+	switch [lindex $commitinfo($id) 9] secret {
+	    set shape rect
+	} public {
+	    set outline black
+	    set ofill blue
+	}
+    }
+    if {[info exists obsolete($id)]} {
+	set outline darkgrey
+	set ofill lightgrey
+    }
+    assigncolor $id
+    set currentparents {}
+    set dupparents {}
+    if {[info exists commitlisted($id)] && [info exists parents($id)]} {
+	foreach p $parents($id) {
+	    if {[lsearch -exact $currentparents $p] < 0} {
+		lappend currentparents $p
+	    } else {
+		# remember that this parent was listed twice
+		lappend dupparents $p
+	    }
+	}
+    }
+    set x [xcoord $level $level $lineno]
+    set y1 $canvy
+    set canvy [expr $canvy + $linespc]
+    allcanvs conf -scrollregion \
+	[list 0 0 0 [expr $y1 + 0.5 * $linespc + 2]]
+    if {[info exists mainline($id)]} {
+	lappend mainline($id) $x $y1
+	if {$mainlinearrow($id) ne "none"} {
+	    set mainline($id) [trimdiagstart $mainline($id)]
+	}
+    }
+    drawlines $id 0
+    set orad [expr {$linespc / 3}]
+    set t [$canv create $shape [expr $x - $orad] [expr $y1 - $orad] \
+	       [expr $x + $orad - 1] [expr $y1 + $orad - 1] \
+	       -fill $ofill -outline $outline -width 1]
+    $canv raise $t
+    $canv bind $t <1> {selcanvline {} %x %y}
+    set xt [xcoord [llength $displist] $level $lineno]
+    if {[llength $currentparents] > 2} {
+	set xt [expr {$xt + ([llength $currentparents] - 2) * $linespc}]
+    }
+    set rowtextx($lineno) $xt
+    set idpos($id) [list $x $xt $y1]
+    if {[info exists idtags($id)] || [info exists idheads($id)]
+	|| [info exists idotherrefs($id)] || [info exists idbookmarks($id)]} {
+	set xt [drawtags $id $x $xt $y1]
+    }
+    set headline [lindex $commitinfo($id) 0]
+    set name [lindex $commitinfo($id) 1]
+    assignauthorcolor $name
+    set fg $aucolormap($name)
+    if {$id == $curid} {
+	set fn $curidfont
+    } else {
+	set fn $mainfont
+    }
+
+    set date [lindex $commitinfo($id) 2]
+    set linehtag($lineno) [$canv create text $xt $y1 -anchor w \
+			       -text $headline -font $fn \
+			       -fill $fg]
+    $canv bind $linehtag($lineno) <<B3>> "rowmenu %X %Y $id"
+    set linentag($lineno) [$canv2 create text 3 $y1 -anchor w \
+			       -text $name -font $namefont \
+			       -fill $fg]
+    set linedtag($lineno) [$canv3 create text 3 $y1 -anchor w \
+			       -text $date -font $mainfont \
+			       -fill $fg]
+
+    set olddlevel $level
+    set olddisplist $displist
+    set oldnlines [llength $displist]
+}
+
+proc drawtags {id x xt y1} {
+    global bookmarkcurrent idtags idbookmarks idheads idotherrefs commitinfo
+    global linespc lthickness
+    global canv mainfont idline rowtextx
+
+    set marks {}
+    set nbookmarks 0
+    set ntags 0
+    set nheads 0
+    if {[info exists idtags($id)]} {
+	set marks $idtags($id)
+	set ntags [llength $marks]
+    }
+    if {[info exists idbookmarks($id)]} {
+	set marks [concat $marks $idbookmarks($id)]
+	set nbookmarks [llength $idbookmarks($id)]
+    }
+    if {[info exists idheads($id)]} {
+	set headmark [lindex $commitinfo($id) 7]
+	if {$headmark ne "default"} {
+	    lappend marks $headmark
+	    set nheads 1
+	}
+    }
+    if {$marks eq {}} {
+	return $xt
+    }
+
+    set delta [expr {int(0.5 * ($linespc - $lthickness))}]
+    set yt [expr $y1 - 0.5 * $linespc]
+    set yb [expr $yt + $linespc - 1]
+    set xvals {}
+    set wvals {}
+    foreach tag $marks {
+	set wid [font measure $mainfont $tag]
+	lappend xvals $xt
+	lappend wvals $wid
+	set xt [expr {$xt + $delta + $wid + $lthickness + $linespc}]
+    }
+    set t [$canv create line $x $y1 [lindex $xvals end] $y1 \
+	       -width $lthickness -fill black -tags tag.$id]
+    $canv lower $t
+    foreach tag $marks x $xvals wid $wvals {
+	set xl [expr $x + $delta]
+	set xr [expr $x + $delta + $wid + $lthickness]
+	if {[incr ntags -1] >= 0} {
+	    # draw a tag
+	    set t [$canv create polygon $x [expr $yt + $delta] $xl $yt \
+		       $xr $yt $xr $yb $xl $yb $x [expr $yb - $delta] \
+		       -width 1 -outline black -fill yellow -tags tag.$id]
+	    $canv bind $t <1> [list showtag $tag 1]
+	    set rowtextx($idline($id)) [expr {$xr + $linespc}]
+	} elseif {[incr nbookmarks -1] >= 0} {
+            # draw a tag
+            set col "#7f7f7f"
+            if {[string compare $bookmarkcurrent $tag] == 0} {
+                set col "#bebebe"
+            }
+            set xl [expr $xl - $delta/2]
+            $canv create polygon $x $yt $xr $yt $xr $yb $x $yb \
+                -width 1 -outline black -fill $col -tags tag.$id
+        } else {
+            # draw a head or other ref
+            if {[incr nheads -1] >= 0} {
+                set col "#00ff00"
+            } else {
+                set col "#ddddff"
+            }
+            set xl [expr $xl - $delta/2]
+            $canv create polygon $x $yt $xr $yt $xr $yb $x $yb \
+                -width 1 -outline black -fill $col -tags tag.$id
+	}
+	set t [$canv create text $xl $y1 -anchor w -text $tag \
+		   -font $mainfont -tags tag.$id]
+	if {$ntags >= 0} {
+	    $canv bind $t <1> [list showtag $tag 1]
+	}
+    }
+    return $xt
+}
+
+proc notecrossings {id lo hi corner} {
+    global olddisplist crossings cornercrossings
+
+    for {set i $lo} {[incr i] < $hi} {} {
+	set p [lindex $olddisplist $i]
+	if {$p == {}} continue
+	if {$i == $corner} {
+	    if {![info exists cornercrossings($id)]
+		|| [lsearch -exact $cornercrossings($id) $p] < 0} {
+		lappend cornercrossings($id) $p
+	    }
+	    if {![info exists cornercrossings($p)]
+		|| [lsearch -exact $cornercrossings($p) $id] < 0} {
+		lappend cornercrossings($p) $id
+	    }
+	} else {
+	    if {![info exists crossings($id)]
+		|| [lsearch -exact $crossings($id) $p] < 0} {
+		lappend crossings($id) $p
+	    }
+	    if {![info exists crossings($p)]
+		|| [lsearch -exact $crossings($p) $id] < 0} {
+		lappend crossings($p) $id
+	    }
+	}
+    }
+}
+
+proc xcoord {i level ln} {
+    global canvx0 xspc1 xspc2
+
+    set x [expr {$canvx0 + $i * $xspc1($ln)}]
+    if {$i > 0 && $i == $level} {
+	set x [expr {$x + 0.5 * ($xspc2 - $xspc1($ln))}]
+    } elseif {$i > $level} {
+	set x [expr {$x + $xspc2 - $xspc1($ln)}]
+    }
+    return $x
+}
+
+# it seems Tk can't draw arrows on the end of diagonal line segments...
+proc trimdiagend {line} {
+    while {[llength $line] > 4} {
+	set x1 [lindex $line end-3]
+	set y1 [lindex $line end-2]
+	set x2 [lindex $line end-1]
+	set y2 [lindex $line end]
+	if {($x1 == $x2) != ($y1 == $y2)} break
+	set line [lreplace $line end-1 end]
+    }
+    return $line
+}
+
+proc trimdiagstart {line} {
+    while {[llength $line] > 4} {
+	set x1 [lindex $line 0]
+	set y1 [lindex $line 1]
+	set x2 [lindex $line 2]
+	set y2 [lindex $line 3]
+	if {($x1 == $x2) != ($y1 == $y2)} break
+	set line [lreplace $line 0 1]
+    }
+    return $line
+}
+
+proc drawslants {id needonscreen nohs} {
+    global canv mainline mainlinearrow sidelines
+    global canvx0 canvy xspc1 xspc2 lthickness
+    global currentparents dupparents
+    global lthickness linespc canvy colormap lineno geometry
+    global maxgraphpct maxwidth
+    global displist onscreen lastuse
+    global parents commitlisted
+    global oldnlines olddlevel olddisplist
+    global nhyperspace numcommits nnewparents
+
+    if {$lineno < 0} {
+	lappend displist $id
+	set onscreen($id) 1
+	return 0
+    }
+
+    set y1 [expr {$canvy - $linespc}]
+    set y2 $canvy
+
+    # work out what we need to get back on screen
+    set reins {}
+    if {$onscreen($id) < 0} {
+	# next to do isn't displayed, better get it on screen...
+	lappend reins [list $id 0]
+    }
+    # make sure all the previous commits's parents are on the screen
+    foreach p $currentparents {
+	if {$onscreen($p) < 0} {
+	    lappend reins [list $p 0]
+	}
+    }
+    # bring back anything requested by caller
+    if {$needonscreen ne {}} {
+	lappend reins $needonscreen
+    }
+
+    # try the shortcut
+    if {$currentparents == $id && $onscreen($id) == 0 && $reins eq {}} {
+	set dlevel $olddlevel
+	set x [xcoord $dlevel $dlevel $lineno]
+	set mainline($id) [list $x $y1]
+	set mainlinearrow($id) none
+	set lastuse($id) $lineno
+	set displist [lreplace $displist $dlevel $dlevel $id]
+	set onscreen($id) 1
+	set xspc1([expr {$lineno + 1}]) $xspc1($lineno)
+	return $dlevel
+    }
+
+    # update displist
+    set displist [lreplace $displist $olddlevel $olddlevel]
+    set j $olddlevel
+    foreach p $currentparents {
+	set lastuse($p) $lineno
+	if {$onscreen($p) == 0} {
+	    set displist [linsert $displist $j $p]
+	    set onscreen($p) 1
+	    incr j
+	}
+    }
+    if {$onscreen($id) == 0} {
+	lappend displist $id
+	set onscreen($id) 1
+    }
+
+    # remove the null entry if present
+    set nullentry [lsearch -exact $displist {}]
+    if {$nullentry >= 0} {
+	set displist [lreplace $displist $nullentry $nullentry]
+    }
+
+    # bring back the ones we need now (if we did it earlier
+    # it would change displist and invalidate olddlevel)
+    foreach pi $reins {
+	# test again in case of duplicates in reins
+	set p [lindex $pi 0]
+	if {$onscreen($p) < 0} {
+	    set onscreen($p) 1
+	    set lastuse($p) $lineno
+	    set displist [linsert $displist [lindex $pi 1] $p]
+	    incr nhyperspace -1
+	}
+    }
+
+    set lastuse($id) $lineno
+
+    # see if we need to make any lines jump off into hyperspace
+    set displ [llength $displist]
+    if {$displ > $maxwidth} {
+	set ages {}
+	foreach x $displist {
+	    lappend ages [list $lastuse($x) $x]
+	}
+	set ages [lsort -integer -index 0 $ages]
+	set k 0
+	while {$displ > $maxwidth} {
+	    set use [lindex $ages $k 0]
+	    set victim [lindex $ages $k 1]
+	    if {$use >= $lineno - 5} break
+	    incr k
+	    if {[lsearch -exact $nohs $victim] >= 0} continue
+	    set i [lsearch -exact $displist $victim]
+	    set displist [lreplace $displist $i $i]
+	    set onscreen($victim) -1
+	    incr nhyperspace
+	    incr displ -1
+	    if {$i < $nullentry} {
+		incr nullentry -1
+	    }
+	    set x [lindex $mainline($victim) end-1]
+	    lappend mainline($victim) $x $y1
+	    set line [trimdiagend $mainline($victim)]
+	    set arrow "last"
+	    if {$mainlinearrow($victim) ne "none"} {
+		set line [trimdiagstart $line]
+		set arrow "both"
+	    }
+	    lappend sidelines($victim) [list $line 1 $arrow]
+	    unset mainline($victim)
+	}
+    }
+
+    set dlevel [lsearch -exact $displist $id]
+
+    # If we are reducing, put in a null entry
+    if {$displ < $oldnlines} {
+	# does the next line look like a merge?
+	# i.e. does it have > 1 new parent?
+	if {$nnewparents($id) > 1} {
+	    set i [expr {$dlevel + 1}]
+	} elseif {$nnewparents([lindex $olddisplist $olddlevel]) == 0} {
+	    set i $olddlevel
+	    if {$nullentry >= 0 && $nullentry < $i} {
+		incr i -1
+	    }
+	} elseif {$nullentry >= 0} {
+	    set i $nullentry
+	    while {$i < $displ
+		   && [lindex $olddisplist $i] == [lindex $displist $i]} {
+		incr i
+	    }
+	} else {
+	    set i $olddlevel
+	    if {$dlevel >= $i} {
+		incr i
+	    }
+	}
+	if {$i < $displ} {
+	    set displist [linsert $displist $i {}]
+	    incr displ
+	    if {$dlevel >= $i} {
+		incr dlevel
+	    }
+	}
+    }
+
+    # decide on the line spacing for the next line
+    set lj [expr {$lineno + 1}]
+    set maxw [expr {$maxgraphpct * $geometry(canv1) / 100}]
+    if {$displ <= 1 || $canvx0 + $displ * $xspc2 <= $maxw} {
+	set xspc1($lj) $xspc2
+    } else {
+	set xspc1($lj) [expr {($maxw - $canvx0 - $xspc2) / ($displ - 1)}]
+	if {$xspc1($lj) < $lthickness} {
+	    set xspc1($lj) $lthickness
+	}
+    }
+
+    foreach idi $reins {
+	set id [lindex $idi 0]
+	set j [lsearch -exact $displist $id]
+	set xj [xcoord $j $dlevel $lj]
+	set mainline($id) [list $xj $y2]
+	set mainlinearrow($id) first
+    }
+
+    set i -1
+    foreach id $olddisplist {
+	incr i
+	if {$id == {}} continue
+	if {$onscreen($id) <= 0} continue
+	set xi [xcoord $i $olddlevel $lineno]
+	if {$i == $olddlevel} {
+	    foreach p $currentparents {
+		set j [lsearch -exact $displist $p]
+		set coords [list $xi $y1]
+		set xj [xcoord $j $dlevel $lj]
+		if {$xj < $xi - $linespc} {
+		    lappend coords [expr {$xj + $linespc}] $y1
+		    notecrossings $p $j $i [expr {$j + 1}]
+		} elseif {$xj > $xi + $linespc} {
+		    lappend coords [expr {$xj - $linespc}] $y1
+		    notecrossings $p $i $j [expr {$j - 1}]
+		}
+		if {[lsearch -exact $dupparents $p] >= 0} {
+		    # draw a double-width line to indicate the doubled parent
+		    lappend coords $xj $y2
+		    lappend sidelines($p) [list $coords 2 none]
+		    if {![info exists mainline($p)]} {
+			set mainline($p) [list $xj $y2]
+			set mainlinearrow($p) none
+		    }
+		} else {
+		    # normal case, no parent duplicated
+		    set yb $y2
+		    set dx [expr {abs($xi - $xj)}]
+		    if {0 && $dx < $linespc} {
+			set yb [expr {$y1 + $dx}]
+		    }
+		    if {![info exists mainline($p)]} {
+			if {$xi != $xj} {
+			    lappend coords $xj $yb
+			}
+			set mainline($p) $coords
+			set mainlinearrow($p) none
+		    } else {
+			lappend coords $xj $yb
+			if {$yb < $y2} {
+			    lappend coords $xj $y2
+			}
+			lappend sidelines($p) [list $coords 1 none]
+		    }
+		}
+	    }
+	} else {
+	    set j $i
+	    if {[lindex $displist $i] != $id} {
+		set j [lsearch -exact $displist $id]
+	    }
+	    if {$j != $i || $xspc1($lineno) != $xspc1($lj)
+		|| ($olddlevel < $i && $i < $dlevel)
+		|| ($dlevel < $i && $i < $olddlevel)} {
+		set xj [xcoord $j $dlevel $lj]
+		lappend mainline($id) $xi $y1 $xj $y2
+	    }
+	}
+    }
+    return $dlevel
+}
+
+# search for x in a list of lists
+proc llsearch {llist x} {
+    set i 0
+    foreach l $llist {
+	if {$l == $x || [lsearch -exact $l $x] >= 0} {
+	    return $i
+	}
+	incr i
+    }
+    return -1
+}
+
+proc drawmore {reading} {
+    global displayorder numcommits ncmupdate nextupdate
+    global stopped nhyperspace parents commitlisted
+    global maxwidth onscreen displist currentparents olddlevel
+
+    set n [llength $displayorder]
+    while {$numcommits < $n} {
+	set id [lindex $displayorder $numcommits]
+	set ctxend [expr {$numcommits + 10}]
+	if {!$reading && $ctxend > $n} {
+	    set ctxend $n
+	}
+	set dlist {}
+	if {$numcommits > 0} {
+	    set dlist [lreplace $displist $olddlevel $olddlevel]
+	    set i $olddlevel
+	    foreach p $currentparents {
+		if {$onscreen($p) == 0} {
+		    set dlist [linsert $dlist $i $p]
+		    incr i
+		}
+	    }
+	}
+	set nohs {}
+	set reins {}
+	set isfat [expr {[llength $dlist] > $maxwidth}]
+	if {$nhyperspace > 0 || $isfat} {
+	    if {$ctxend > $n} break
+	    # work out what to bring back and
+	    # what we want to don't want to send into hyperspace
+	    set room 1
+	    for {set k $numcommits} {$k < $ctxend} {incr k} {
+		set x [lindex $displayorder $k]
+		set i [llsearch $dlist $x]
+		if {$i < 0} {
+		    set i [llength $dlist]
+		    lappend dlist $x
+		}
+		if {[lsearch -exact $nohs $x] < 0} {
+		    lappend nohs $x
+		}
+		if {$reins eq {} && $onscreen($x) < 0 && $room} {
+		    set reins [list $x $i]
+		}
+		set newp {}
+		if {[info exists commitlisted($x)]} {
+		    set right 0
+		    foreach p $parents($x) {
+			if {[llsearch $dlist $p] < 0} {
+			    lappend newp $p
+			    if {[lsearch -exact $nohs $p] < 0} {
+				lappend nohs $p
+			    }
+			    if {$reins eq {} && $onscreen($p) < 0 && $room} {
+				set reins [list $p [expr {$i + $right}]]
+			    }
+			}
+			set right 1
+		    }
+		}
+		set l [lindex $dlist $i]
+		if {[llength $l] == 1} {
+		    set l $newp
+		} else {
+		    set j [lsearch -exact $l $x]
+		    set l [concat [lreplace $l $j $j] $newp]
+		}
+		set dlist [lreplace $dlist $i $i $l]
+		if {$room && $isfat && [llength $newp] <= 1} {
+		    set room 0
+		}
+	    }
+	}
+
+	set dlevel [drawslants $id $reins $nohs]
+	drawcommitline $dlevel
+	if {[clock clicks -milliseconds] >= $nextupdate
+	    && $numcommits >= $ncmupdate} {
+	    doupdate $reading
+	    if {$stopped} break
+	}
+    }
+}
+
+# level here is an index in todo
+proc updatetodo {level noshortcut} {
+    global ncleft todo nnewparents
+    global commitlisted parents onscreen
+
+    set id [lindex $todo $level]
+    set olds {}
+    if {[info exists commitlisted($id)]} {
+	foreach p $parents($id) {
+	    if {[lsearch -exact $olds $p] < 0} {
+		lappend olds $p
+	    }
+	}
+    }
+    if {!$noshortcut && [llength $olds] == 1} {
+	set p [lindex $olds 0]
+	if {$ncleft($p) == 1 && [lsearch -exact $todo $p] < 0} {
+	    set ncleft($p) 0
+	    set todo [lreplace $todo $level $level $p]
+	    set onscreen($p) 0
+	    set nnewparents($id) 1
+	    return 0
+	}
+    }
+
+    set todo [lreplace $todo $level $level]
+    set i $level
+    set n 0
+    foreach p $olds {
+	incr ncleft($p) -1
+	set k [lsearch -exact $todo $p]
+	if {$k < 0} {
+	    set todo [linsert $todo $i $p]
+	    set onscreen($p) 0
+	    incr i
+	    incr n
+	}
+    }
+    set nnewparents($id) $n
+
+    return 1
+}
+
+proc decidenext {{noread 0}} {
+    global ncleft todo
+    global datemode cdate
+    global commitinfo
+
+    # choose which one to do next time around
+    set todol [llength $todo]
+    set level -1
+    set latest {}
+    for {set k $todol} {[incr k -1] >= 0} {} {
+	set p [lindex $todo $k]
+	if {$ncleft($p) == 0} {
+	    if {$datemode} {
+		if {![info exists commitinfo($p)]} {
+		    if {$noread} {
+			return {}
+		    }
+		    readcommit $p
+		}
+		if {$latest == {} || $cdate($p) > $latest} {
+		    set level $k
+		    set latest $cdate($p)
+		}
+	    } else {
+		set level $k
+		break
+	    }
+	}
+    }
+    if {$level < 0} {
+	if {$todo != {}} {
+	    puts "ERROR: none of the pending commits can be done yet:"
+	    foreach p $todo {
+		puts "  $p ($ncleft($p))"
+	    }
+	}
+	return -1
+    }
+
+    return $level
+}
+
+proc drawcommit {id} {
+    global phase todo nchildren datemode nextupdate
+    global numcommits ncmupdate displayorder todo onscreen
+
+    if {$phase != "incrdraw"} {
+	set phase incrdraw
+	set displayorder {}
+	set todo {}
+	initgraph
+    }
+    if {$nchildren($id) == 0} {
+	lappend todo $id
+	set onscreen($id) 0
+    }
+    set level [decidenext 1]
+    if {$level == {} || $id != [lindex $todo $level]} {
+	return
+    }
+    while 1 {
+	lappend displayorder [lindex $todo $level]
+	if {[updatetodo $level $datemode]} {
+	    set level [decidenext 1]
+	    if {$level == {}} break
+	}
+	set id [lindex $todo $level]
+	if {![info exists commitlisted($id)]} {
+	    break
+	}
+    }
+    drawmore 1
+}
+
+proc finishcommits {} {
+    global phase
+    global canv mainfont ctext maincursor textcursor
+
+    if {$phase != "incrdraw"} {
+	$canv delete all
+	$canv create text 3 3 -anchor nw -text "No commits selected" \
+	    -font $mainfont -tags textitems
+	set phase {}
+    } else {
+	drawrest
+    }
+    . config -cursor $maincursor
+    settextcursor $textcursor
+}
+
+# Don't change the text pane cursor if it is currently the hand cursor,
+# showing that we are over a sha1 ID link.
+proc settextcursor {c} {
+    global ctext curtextcursor
+
+    if {[$ctext cget -cursor] == $curtextcursor} {
+	$ctext config -cursor $c
+    }
+    set curtextcursor $c
+}
+
+proc drawgraph {} {
+    global nextupdate startmsecs ncmupdate
+    global displayorder onscreen
+
+    if {$displayorder == {}} return
+    set startmsecs [clock clicks -milliseconds]
+    set nextupdate [expr $startmsecs + 100]
+    set ncmupdate 1
+    initgraph
+    foreach id $displayorder {
+	set onscreen($id) 0
+    }
+    drawmore 0
+}
+
+proc drawrest {} {
+    global phase stopped redisplaying selectedline
+    global datemode todo displayorder
+    global numcommits ncmupdate
+    global nextupdate startmsecs
+
+    set level [decidenext]
+    if {$level >= 0} {
+	set phase drawgraph
+	while 1 {
+	    lappend displayorder [lindex $todo $level]
+	    set hard [updatetodo $level $datemode]
+	    if {$hard} {
+		set level [decidenext]
+		if {$level < 0} break
+	    }
+	}
+	drawmore 0
+    }
+    set phase {}
+    set drawmsecs [expr [clock clicks -milliseconds] - $startmsecs]
+    #puts "overall $drawmsecs ms for $numcommits commits"
+    if {$redisplaying} {
+	if {$stopped == 0 && [info exists selectedline]} {
+	    selectline $selectedline 0
+	}
+	if {$stopped == 1} {
+	    set stopped 0
+	    after idle drawgraph
+	} else {
+	    set redisplaying 0
+	}
+    }
+}
+
+proc findmatches {f} {
+    global findtype foundstring foundstrlen
+    if {$findtype == "Regexp"} {
+	set matches [regexp -indices -all -inline $foundstring $f]
+    } else {
+	if {$findtype == "IgnCase"} {
+	    set str [string tolower $f]
+	} else {
+	    set str $f
+	}
+	set matches {}
+	set i 0
+	while {[set j [string first $foundstring $str $i]] >= 0} {
+	    lappend matches [list $j [expr $j+$foundstrlen-1]]
+	    set i [expr $j + $foundstrlen]
+	}
+    }
+    return $matches
+}
+
+proc dofind {} {
+    global findtype findloc findstring markedmatches commitinfo
+    global numcommits lineid linehtag linentag linedtag
+    global mainfont namefont canv canv2 canv3 selectedline
+    global matchinglines foundstring foundstrlen
+
+    stopfindproc
+    unmarkmatches
+    focus .
+    set matchinglines {}
+    if {$findloc == "Pickaxe"} {
+	findpatches
+	return
+    }
+    if {$findtype == "IgnCase"} {
+	set foundstring [string tolower $findstring]
+    } else {
+	set foundstring $findstring
+    }
+    set foundstrlen [string length $findstring]
+    if {$foundstrlen == 0} return
+    if {$findloc == "Files"} {
+	findfiles
+	return
+    }
+    if {![info exists selectedline]} {
+	set oldsel -1
+    } else {
+	set oldsel $selectedline
+    }
+    set didsel 0
+    set fldtypes {Headline Author Date CDate Comment}
+    for {set l 0} {$l < $numcommits} {incr l} {
+	set id $lineid($l)
+	set info $commitinfo($id)
+	set doesmatch 0
+	foreach f $info ty $fldtypes {
+	    if {$findloc != "All fields" && $findloc != $ty} {
+		continue
+	    }
+	    set matches [findmatches $f]
+	    if {$matches == {}} continue
+	    set doesmatch 1
+	    if {$ty == "Headline"} {
+		markmatches $canv $l $f $linehtag($l) $matches $mainfont
+	    } elseif {$ty == "Author"} {
+		markmatches $canv2 $l $f $linentag($l) $matches $namefont
+	    } elseif {$ty == "Date"} {
+		markmatches $canv3 $l $f $linedtag($l) $matches $mainfont
+	    }
+	}
+	if {$doesmatch} {
+	    lappend matchinglines $l
+	    if {!$didsel && $l > $oldsel} {
+		findselectline $l
+		set didsel 1
+	    }
+	}
+    }
+    if {$matchinglines == {}} {
+	bell
+    } elseif {!$didsel} {
+	findselectline [lindex $matchinglines 0]
+    }
+}
+
+proc findselectline {l} {
+    global findloc commentend ctext
+    selectline $l 1
+    if {$findloc == "All fields" || $findloc == "Comments"} {
+	# highlight the matches in the comments
+	set f [$ctext get 1.0 $commentend]
+	set matches [findmatches $f]
+	foreach match $matches {
+	    set start [lindex $match 0]
+	    set end [expr [lindex $match 1] + 1]
+	    $ctext tag add found "1.0 + $start c" "1.0 + $end c"
+	}
+    }
+}
+
+proc findnext {restart} {
+    global matchinglines selectedline
+    if {![info exists matchinglines]} {
+	if {$restart} {
+	    dofind
+	}
+	return
+    }
+    if {![info exists selectedline]} return
+    foreach l $matchinglines {
+	if {$l > $selectedline} {
+	    findselectline $l
+	    return
+	}
+    }
+    bell
+}
+
+proc findprev {} {
+    global matchinglines selectedline
+    if {![info exists matchinglines]} {
+	dofind
+	return
+    }
+    if {![info exists selectedline]} return
+    set prev {}
+    foreach l $matchinglines {
+	if {$l >= $selectedline} break
+	set prev $l
+    }
+    if {$prev != {}} {
+	findselectline $prev
+    } else {
+	bell
+    }
+}
+
+proc findlocchange {name ix op} {
+    global findloc findtype findtypemenu
+    if {$findloc == "Pickaxe"} {
+	set findtype Exact
+	set state disabled
+    } else {
+	set state normal
+    }
+    $findtypemenu entryconf 1 -state $state
+    $findtypemenu entryconf 2 -state $state
+}
+
+proc stopfindproc {{done 0}} {
+    global findprocpid findprocfile findids
+    global ctext findoldcursor phase maincursor textcursor
+    global findinprogress
+
+    catch {unset findids}
+    if {[info exists findprocpid]} {
+	if {!$done} {
+	    catch {exec kill $findprocpid}
+	}
+	catch {close $findprocfile}
+	unset findprocpid
+    }
+    if {[info exists findinprogress]} {
+	unset findinprogress
+	if {$phase != "incrdraw"} {
+	    . config -cursor $maincursor
+	    settextcursor $textcursor
+	}
+    }
+}
+
+proc findpatches {} {
+    global findstring selectedline numcommits
+    global findprocpid findprocfile
+    global finddidsel ctext lineid findinprogress
+    global findinsertpos
+    global env
+
+    if {$numcommits == 0} return
+
+    # make a list of all the ids to search, starting at the one
+    # after the selected line (if any)
+    if {[info exists selectedline]} {
+	set l $selectedline
+    } else {
+	set l -1
+    }
+    set inputids {}
+    for {set i 0} {$i < $numcommits} {incr i} {
+	if {[incr l] >= $numcommits} {
+	    set l 0
+	}
+	append inputids $lineid($l) "\n"
+    }
+
+    if {[catch {
+	set f [open [list | $env(HG) --config ui.report_untrusted=false debug-diff-tree --stdin -s -r -S$findstring << $inputids] r]
+    } err]} {
+	error_popup "Error starting search process: $err"
+	return
+    }
+
+    set findinsertpos end
+    set findprocfile $f
+    set findprocpid [pid $f]
+    fconfigure $f -blocking 0
+    fileevent $f readable readfindproc
+    set finddidsel 0
+    . config -cursor watch
+    settextcursor watch
+    set findinprogress 1
+}
+
+proc readfindproc {} {
+    global findprocfile finddidsel
+    global idline matchinglines findinsertpos
+
+    set n [gets $findprocfile line]
+    if {$n < 0} {
+	if {[eof $findprocfile]} {
+	    stopfindproc 1
+	    if {!$finddidsel} {
+		bell
+	    }
+	}
+	return
+    }
+    if {![regexp {^[0-9a-f]{12}} $line id]} {
+	error_popup "Can't parse git-diff-tree output: $line"
+	stopfindproc
+	return
+    }
+    if {![info exists idline($id)]} {
+	puts stderr "spurious id: $id"
+	return
+    }
+    set l $idline($id)
+    insertmatch $l $id
+}
+
+proc insertmatch {l id} {
+    global matchinglines findinsertpos finddidsel
+
+    if {$findinsertpos == "end"} {
+	if {$matchinglines != {} && $l < [lindex $matchinglines 0]} {
+	    set matchinglines [linsert $matchinglines 0 $l]
+	    set findinsertpos 1
+	} else {
+	    lappend matchinglines $l
+	}
+    } else {
+	set matchinglines [linsert $matchinglines $findinsertpos $l]
+	incr findinsertpos
+    }
+    markheadline $l $id
+    if {!$finddidsel} {
+	findselectline $l
+	set finddidsel 1
+    }
+}
+
+proc findfiles {} {
+    global selectedline numcommits lineid ctext
+    global ffileline finddidsel parents nparents
+    global findinprogress findstartline findinsertpos
+    global treediffs fdiffids fdiffsneeded fdiffpos
+    global findmergefiles
+    global env
+
+    if {$numcommits == 0} return
+
+    if {[info exists selectedline]} {
+	set l [expr {$selectedline + 1}]
+    } else {
+	set l 0
+    }
+    set ffileline $l
+    set findstartline $l
+    set diffsneeded {}
+    set fdiffsneeded {}
+    while 1 {
+	set id $lineid($l)
+	if {$findmergefiles || $nparents($id) == 1} {
+	    foreach p $parents($id) {
+		if {![info exists treediffs([list $id $p])]} {
+		    append diffsneeded "$id $p\n"
+		    lappend fdiffsneeded [list $id $p]
+		}
+	    }
+	}
+	if {[incr l] >= $numcommits} {
+	    set l 0
+	}
+	if {$l == $findstartline} break
+    }
+
+    # start off a git-diff-tree process if needed
+    if {$diffsneeded ne {}} {
+	if {[catch {
+	    set df [open [list | $env(HG) --config ui.report_untrusted=false debug-diff-tree -r --stdin << $diffsneeded] r]
+	} err ]} {
+	    error_popup "Error starting search process: $err"
+	    return
+	}
+	catch {unset fdiffids}
+	set fdiffpos 0
+	fconfigure $df -blocking 0
+	fileevent $df readable [list readfilediffs $df]
+    }
+
+    set finddidsel 0
+    set findinsertpos end
+    set id $lineid($l)
+    set p [lindex $parents($id) 0]
+    . config -cursor watch
+    settextcursor watch
+    set findinprogress 1
+    findcont [list $id $p]
+    update
+}
+
+proc readfilediffs {df} {
+    global findids fdiffids fdiffs
+
+    set n [gets $df line]
+    if {$n < 0} {
+	if {[eof $df]} {
+	    donefilediff
+	    if {[catch {close $df} err]} {
+		stopfindproc
+		bell
+		error_popup "Error in hg debug-diff-tree: $err"
+	    } elseif {[info exists findids]} {
+		set ids $findids
+		stopfindproc
+		bell
+		error_popup "Couldn't find diffs for {$ids}"
+	    }
+	}
+	return
+    }
+    if {[regexp {^([0-9a-f]{12}) \(from ([0-9a-f]{12})\)} $line match id p]} {
+	# start of a new string of diffs
+	donefilediff
+	set fdiffids [list $id $p]
+	set fdiffs {}
+    } elseif {[string match ":*" $line]} {
+	lappend fdiffs [lindex $line 5]
+    }
+}
+
+proc donefilediff {} {
+    global fdiffids fdiffs treediffs findids
+    global fdiffsneeded fdiffpos
+
+    if {[info exists fdiffids]} {
+	while {[lindex $fdiffsneeded $fdiffpos] ne $fdiffids
+	       && $fdiffpos < [llength $fdiffsneeded]} {
+	    # git-diff-tree doesn't output anything for a commit
+	    # which doesn't change anything
+	    set nullids [lindex $fdiffsneeded $fdiffpos]
+	    set treediffs($nullids) {}
+	    if {[info exists findids] && $nullids eq $findids} {
+		unset findids
+		findcont $nullids
+	    }
+	    incr fdiffpos
+	}
+	incr fdiffpos
+
+	if {![info exists treediffs($fdiffids)]} {
+	    set treediffs($fdiffids) $fdiffs
+	}
+	if {[info exists findids] && $fdiffids eq $findids} {
+	    unset findids
+	    findcont $fdiffids
+	}
+    }
+}
+
+proc findcont {ids} {
+    global findids treediffs parents nparents
+    global ffileline findstartline finddidsel
+    global lineid numcommits matchinglines findinprogress
+    global findmergefiles
+
+    set id [lindex $ids 0]
+    set p [lindex $ids 1]
+    set pi [lsearch -exact $parents($id) $p]
+    set l $ffileline
+    while 1 {
+	if {$findmergefiles || $nparents($id) == 1} {
+	    if {![info exists treediffs($ids)]} {
+		set findids $ids
+		set ffileline $l
+		return
+	    }
+	    set doesmatch 0
+	    foreach f $treediffs($ids) {
+		set x [findmatches $f]
+		if {$x != {}} {
+		    set doesmatch 1
+		    break
+		}
+	    }
+	    if {$doesmatch} {
+		insertmatch $l $id
+		set pi $nparents($id)
+	    }
+	} else {
+	    set pi $nparents($id)
+	}
+	if {[incr pi] >= $nparents($id)} {
+	    set pi 0
+	    if {[incr l] >= $numcommits} {
+		set l 0
+	    }
+	    if {$l == $findstartline} break
+	    set id $lineid($l)
+	}
+	set p [lindex $parents($id) $pi]
+	set ids [list $id $p]
+    }
+    stopfindproc
+    if {!$finddidsel} {
+	bell
+    }
+}
+
+# mark a commit as matching by putting a yellow background
+# behind the headline
+proc markheadline {l id} {
+    global canv mainfont linehtag commitinfo
+
+    set bbox [$canv bbox $linehtag($l)]
+    set t [$canv create rect $bbox -outline {} -tags matches -fill yellow]
+    $canv lower $t
+}
+
+# mark the bits of a headline, author or date that match a find string
+proc markmatches {canv l str tag matches font} {
+    set bbox [$canv bbox $tag]
+    set x0 [lindex $bbox 0]
+    set y0 [lindex $bbox 1]
+    set y1 [lindex $bbox 3]
+    foreach match $matches {
+	set start [lindex $match 0]
+	set end [lindex $match 1]
+	if {$start > $end} continue
+	set xoff [font measure $font [string range $str 0 [expr $start-1]]]
+	set xlen [font measure $font [string range $str 0 [expr $end]]]
+	set t [$canv create rect [expr $x0+$xoff] $y0 [expr $x0+$xlen+2] $y1 \
+		   -outline {} -tags matches -fill yellow]
+	$canv lower $t
+    }
+}
+
+proc unmarkmatches {} {
+    global matchinglines findids
+    allcanvs delete matches
+    catch {unset matchinglines}
+    catch {unset findids}
+}
+
+proc selcanvline {w x y} {
+    global canv canvy0 ctext linespc
+    global lineid linehtag linentag linedtag rowtextx
+    set ymax [lindex [$canv cget -scrollregion] 3]
+    if {$ymax == {}} return
+    set yfrac [lindex [$canv yview] 0]
+    set y [expr {$y + $yfrac * $ymax}]
+    set l [expr {int(($y - $canvy0) / $linespc + 0.5)}]
+    if {$l < 0} {
+	set l 0
+    }
+    if {$w eq $canv} {
+	if {![info exists rowtextx($l)] || $x < $rowtextx($l)} return
+    }
+    unmarkmatches
+    selectline $l 1
+}
+
+proc commit_descriptor {p} {
+    global commitinfo
+    set l "..."
+    if {[info exists commitinfo($p)]} {
+	set l [lindex $commitinfo($p) 0]
+	set r [lindex $commitinfo($p) 6]
+    }
+    return "$r:$p ($l)"
+}
+
+# append some text to the ctext widget, and make any SHA1 ID
+# that we know about be a clickable link.
+proc appendwithlinks {text} {
+    global ctext idline linknum
+
+    set start [$ctext index "end - 1c"]
+    $ctext insert end $text
+    $ctext insert end "\n"
+    set links [regexp -indices -all -inline {[0-9a-f]{12}} $text]
+    foreach l $links {
+	set s [lindex $l 0]
+	set e [lindex $l 1]
+	set linkid [string range $text $s $e]
+	if {![info exists idline($linkid)]} continue
+	incr e
+	$ctext tag add link "$start + $s c" "$start + $e c"
+	$ctext tag add link$linknum "$start + $s c" "$start + $e c"
+	$ctext tag bind link$linknum <1> [list selectline $idline($linkid) 1]
+	incr linknum
+    }
+    $ctext tag conf link -foreground blue -underline 1
+    $ctext tag bind link <Enter> { %W configure -cursor hand2 }
+    $ctext tag bind link <Leave> { %W configure -cursor $curtextcursor }
+}
+
+proc selectline {l isnew} {
+    global canv canv2 canv3 ctext commitinfo selectedline
+    global lineid linehtag linentag linedtag
+    global canvy0 linespc parents nparents children
+    global cflist currentid sha1entry
+    global commentend idtags idbookmarks idline linknum
+
+    $canv delete hover
+    normalline
+    if {![info exists lineid($l)] || ![info exists linehtag($l)]} return
+    $canv delete secsel
+    set t [eval $canv create rect [$canv bbox $linehtag($l)] -outline {{}} \
+	       -tags secsel -fill [$canv cget -selectbackground]]
+    $canv lower $t
+    $canv2 delete secsel
+    set t [eval $canv2 create rect [$canv2 bbox $linentag($l)] -outline {{}} \
+	       -tags secsel -fill [$canv2 cget -selectbackground]]
+    $canv2 lower $t
+    $canv3 delete secsel
+    set t [eval $canv3 create rect [$canv3 bbox $linedtag($l)] -outline {{}} \
+	       -tags secsel -fill [$canv3 cget -selectbackground]]
+    $canv3 lower $t
+    set y [expr {$canvy0 + $l * $linespc}]
+    set ymax [lindex [$canv cget -scrollregion] 3]
+    set ytop [expr {$y - $linespc - 1}]
+    set ybot [expr {$y + $linespc + 1}]
+    set wnow [$canv yview]
+    set wtop [expr [lindex $wnow 0] * $ymax]
+    set wbot [expr [lindex $wnow 1] * $ymax]
+    set wh [expr {$wbot - $wtop}]
+    set newtop $wtop
+    if {$ytop < $wtop} {
+	if {$ybot < $wtop} {
+	    set newtop [expr {$y - $wh / 2.0}]
+	} else {
+	    set newtop $ytop
+	    if {$newtop > $wtop - $linespc} {
+		set newtop [expr {$wtop - $linespc}]
+	    }
+	}
+    } elseif {$ybot > $wbot} {
+	if {$ytop > $wbot} {
+	    set newtop [expr {$y - $wh / 2.0}]
+	} else {
+	    set newtop [expr {$ybot - $wh}]
+	    if {$newtop < $wtop + $linespc} {
+		set newtop [expr {$wtop + $linespc}]
+	    }
+	}
+    }
+    if {$newtop != $wtop} {
+	if {$newtop < 0} {
+	    set newtop 0
+	}
+	allcanvs yview moveto [expr $newtop * 1.0 / $ymax]
+    }
+
+    if {$isnew} {
+	addtohistory [list selectline $l 0]
+    }
+
+    set selectedline $l
+
+    set id $lineid($l)
+    set currentid $id
+    $sha1entry delete 0 end
+    $sha1entry insert 0 $id
+    $sha1entry selection range 0 end
+
+    $ctext conf -state normal
+    $ctext delete 0.0 end
+    set linknum 0
+    $ctext mark set fmark.0 0.0
+    $ctext mark gravity fmark.0 left
+    set info $commitinfo($id)
+    $ctext insert end "Changeset: [lindex $info 6]\n"
+    if {[llength [lindex $info 7]] > 0} {
+        $ctext insert end "Branch: [lindex $info 7]\n"
+    }
+    $ctext insert end "User: [lindex $info 1]\n"
+    $ctext insert end "Date: [lindex $info 2]\n"
+    if {[lindex $info 3] ne ""} {
+	$ctext insert end "Committer: [lindex $info 3]\n"
+    }
+    if {[info exists idbookmarks($id)]} {
+	$ctext insert end "Bookmarks:"
+	foreach bookmark $idbookmarks($id) {
+	    $ctext insert end " $bookmark"
+	}
+	$ctext insert end "\n"
+    }
+
+    if {[info exists idtags($id)]} {
+	$ctext insert end "Tags:"
+	foreach tag $idtags($id) {
+	    $ctext insert end " $tag"
+	}
+	$ctext insert end "\n"
+    }
+
+    set comment {}
+    if {[info exists parents($id)]} {
+	foreach p $parents($id) {
+	    append comment "Parent: [commit_descriptor $p]\n"
+	}
+    }
+    if {[info exists children($id)]} {
+	foreach c $children($id) {
+	    append comment "Child:  [commit_descriptor $c]\n"
+	}
+    }
+
+    if {[lindex $info 9] eq "secret"} {
+	# for now, display phase for secret changesets only
+	append comment "Phase: [lindex $info 9]\n"
+    }
+
+    append comment "\n"
+    append comment [lindex $info 5]
+
+    # make anything that looks like a SHA1 ID be a clickable link
+    appendwithlinks $comment
+
+    $ctext tag delete Comments
+    $ctext tag remove found 1.0 end
+    $ctext conf -state disabled
+    set commentend [$ctext index "end - 1c"]
+
+    $cflist delete 0 end
+    $cflist insert end "Comments"
+    if {$nparents($id) <= 1} {
+    set parent "null"
+    if {$nparents($id) == 1} {
+        set parent $parents($id)
+    }
+	startdiff [concat $id $parent]
+    } elseif {$nparents($id) > 1} {
+	mergediff $id
+    }
+}
+
+proc selnextline {dir} {
+    global selectedline
+    focus .
+    if {![info exists selectedline]} return
+    set l [expr $selectedline + $dir]
+    unmarkmatches
+    selectline $l 1
+}
+
+proc unselectline {} {
+    global selectedline
+
+    catch {unset selectedline}
+    allcanvs delete secsel
+}
+
+proc addtohistory {cmd} {
+    global history historyindex
+
+    if {$historyindex > 0
+	&& [lindex $history [expr {$historyindex - 1}]] == $cmd} {
+	return
+    }
+
+    if {$historyindex < [llength $history]} {
+	set history [lreplace $history $historyindex end $cmd]
+    } else {
+	lappend history $cmd
+    }
+    incr historyindex
+    if {$historyindex > 1} {
+	.ctop.top.bar.leftbut conf -state normal
+    } else {
+	.ctop.top.bar.leftbut conf -state disabled
+    }
+    .ctop.top.bar.rightbut conf -state disabled
+}
+
+proc goback {} {
+    global history historyindex
+    focus .
+
+    if {$historyindex > 1} {
+	incr historyindex -1
+	set cmd [lindex $history [expr {$historyindex - 1}]]
+	eval $cmd
+	.ctop.top.bar.rightbut conf -state normal
+    }
+    if {$historyindex <= 1} {
+	.ctop.top.bar.leftbut conf -state disabled
+    }
+}
+
+proc goforw {} {
+    global history historyindex
+    focus .
+
+    if {$historyindex < [llength $history]} {
+	set cmd [lindex $history $historyindex]
+	incr historyindex
+	eval $cmd
+	.ctop.top.bar.leftbut conf -state normal
+    }
+    if {$historyindex >= [llength $history]} {
+	.ctop.top.bar.rightbut conf -state disabled
+    }
+}
+
+proc mergediff {id} {
+    global parents diffmergeid diffmergegca mergefilelist diffpindex
+
+    set diffmergeid $id
+    set diffpindex -1
+    set diffmergegca [findgca $parents($id)]
+    if {[info exists mergefilelist($id)]} {
+	if {$mergefilelist($id) ne {}} {
+	    showmergediff
+	}
+    } else {
+	contmergediff {}
+    }
+}
+
+proc findgca {ids} {
+    global env
+    set gca {}
+    foreach id $ids {
+	if {$gca eq {}} {
+	    set gca $id
+	} else {
+	    if {[catch {
+		set gca [exec $env(HG) --config ui.report_untrusted=false debug-merge-base $gca $id]
+	    } err]} {
+		return {}
+	    }
+	}
+    }
+    return $gca
+}
+
+proc contmergediff {ids} {
+    global diffmergeid diffpindex parents nparents diffmergegca
+    global treediffs mergefilelist diffids treepending
+
+    # diff the child against each of the parents, and diff
+    # each of the parents against the GCA.
+    while 1 {
+	if {[lindex $ids 0] == $diffmergeid && $diffmergegca ne {}} {
+	    set ids [list [lindex $ids 1] $diffmergegca]
+	} else {
+	    if {[incr diffpindex] >= $nparents($diffmergeid)} break
+	    set p [lindex $parents($diffmergeid) $diffpindex]
+	    set ids [list $diffmergeid $p]
+	}
+	if {![info exists treediffs($ids)]} {
+	    set diffids $ids
+	    if {![info exists treepending]} {
+		gettreediffs $ids
+	    }
+	    return
+	}
+    }
+
+    # If a file in some parent is different from the child and also
+    # different from the GCA, then it's interesting.
+    # If we don't have a GCA, then a file is interesting if it is
+    # different from the child in all the parents.
+    if {$diffmergegca ne {}} {
+	set files {}
+	foreach p $parents($diffmergeid) {
+	    set gcadiffs $treediffs([list $p $diffmergegca])
+	    foreach f $treediffs([list $diffmergeid $p]) {
+		if {[lsearch -exact $files $f] < 0
+		    && [lsearch -exact $gcadiffs $f] >= 0} {
+		    lappend files $f
+		}
+	    }
+	}
+	set files [lsort $files]
+    } else {
+	set p [lindex $parents($diffmergeid) 0]
+	set files $treediffs([list $diffmergeid $p])
+	for {set i 1} {$i < $nparents($diffmergeid) && $files ne {}} {incr i} {
+	    set p [lindex $parents($diffmergeid) $i]
+	    set df $treediffs([list $diffmergeid $p])
+	    set nf {}
+	    foreach f $files {
+		if {[lsearch -exact $df $f] >= 0} {
+		    lappend nf $f
+		}
+	    }
+	    set files $nf
+	}
+    }
+
+    set mergefilelist($diffmergeid) $files
+    if {$files ne {}} {
+	showmergediff
+    }
+}
+
+proc showmergediff {} {
+    global cflist diffmergeid mergefilelist parents
+    global diffopts diffinhunk currentfile currenthunk filelines
+    global diffblocked groupfilelast mergefds groupfilenum grouphunks
+    global env
+
+    set files $mergefilelist($diffmergeid)
+    foreach f $files {
+	$cflist insert end $f
+    }
+    set env(GIT_DIFF_OPTS) $diffopts
+    set flist {}
+    catch {unset currentfile}
+    catch {unset currenthunk}
+    catch {unset filelines}
+    catch {unset groupfilenum}
+    catch {unset grouphunks}
+    set groupfilelast -1
+    foreach p $parents($diffmergeid) {
+	set cmd [list | $env(HG) --config ui.report_untrusted=false debug-diff-tree -p $p $diffmergeid]
+	set cmd [concat $cmd $mergefilelist($diffmergeid)]
+	if {[catch {set f [open $cmd r]} err]} {
+	    error_popup "Error getting diffs: $err"
+	    foreach f $flist {
+		catch {close $f}
+	    }
+	    return
+	}
+	lappend flist $f
+	set ids [list $diffmergeid $p]
+	set mergefds($ids) $f
+	set diffinhunk($ids) 0
+	set diffblocked($ids) 0
+	fconfigure $f -blocking 0
+	fileevent $f readable [list getmergediffline $f $ids $diffmergeid]
+    }
+}
+
+proc getmergediffline {f ids id} {
+    global diffmergeid diffinhunk diffoldlines diffnewlines
+    global currentfile currenthunk
+    global diffoldstart diffnewstart diffoldlno diffnewlno
+    global diffblocked mergefilelist
+    global noldlines nnewlines difflcounts filelines
+
+    set n [gets $f line]
+    if {$n < 0} {
+	if {![eof $f]} return
+    }
+
+    if {!([info exists diffmergeid] && $diffmergeid == $id)} {
+	if {$n < 0} {
+	    close $f
+	}
+	return
+    }
+
+    if {$diffinhunk($ids) != 0} {
+	set fi $currentfile($ids)
+	if {$n > 0 && [regexp {^[-+ \\]} $line match]} {
+	    # continuing an existing hunk
+	    set line [string range $line 1 end]
+	    set p [lindex $ids 1]
+	    if {$match eq "-" || $match eq " "} {
+		set filelines($p,$fi,$diffoldlno($ids)) $line
+		incr diffoldlno($ids)
+	    }
+	    if {$match eq "+" || $match eq " "} {
+		set filelines($id,$fi,$diffnewlno($ids)) $line
+		incr diffnewlno($ids)
+	    }
+	    if {$match eq " "} {
+		if {$diffinhunk($ids) == 2} {
+		    lappend difflcounts($ids) \
+			[list $noldlines($ids) $nnewlines($ids)]
+		    set noldlines($ids) 0
+		    set diffinhunk($ids) 1
+		}
+		incr noldlines($ids)
+	    } elseif {$match eq "-" || $match eq "+"} {
+		if {$diffinhunk($ids) == 1} {
+		    lappend difflcounts($ids) [list $noldlines($ids)]
+		    set noldlines($ids) 0
+		    set nnewlines($ids) 0
+		    set diffinhunk($ids) 2
+		}
+		if {$match eq "-"} {
+		    incr noldlines($ids)
+		} else {
+		    incr nnewlines($ids)
+		}
+	    }
+	    # and if it's \ No newline at end of line, then what?
+	    return
+	}
+	# end of a hunk
+	if {$diffinhunk($ids) == 1 && $noldlines($ids) != 0} {
+	    lappend difflcounts($ids) [list $noldlines($ids)]
+	} elseif {$diffinhunk($ids) == 2
+		  && ($noldlines($ids) != 0 || $nnewlines($ids) != 0)} {
+	    lappend difflcounts($ids) [list $noldlines($ids) $nnewlines($ids)]
+	}
+	set currenthunk($ids) [list $currentfile($ids) \
+				   $diffoldstart($ids) $diffnewstart($ids) \
+				   $diffoldlno($ids) $diffnewlno($ids) \
+				   $difflcounts($ids)]
+	set diffinhunk($ids) 0
+	# -1 = need to block, 0 = unblocked, 1 = is blocked
+	set diffblocked($ids) -1
+	processhunks
+	if {$diffblocked($ids) == -1} {
+	    fileevent $f readable {}
+	    set diffblocked($ids) 1
+	}
+    }
+
+    if {$n < 0} {
+	# eof
+	if {!$diffblocked($ids)} {
+	    close $f
+	    set currentfile($ids) [llength $mergefilelist($diffmergeid)]
+	    set currenthunk($ids) [list $currentfile($ids) 0 0 0 0 {}]
+	    processhunks
+	}
+    } elseif {[regexp {^diff --git a/(.*) b/} $line match fname]} {
+	# start of a new file
+	set currentfile($ids) \
+	    [lsearch -exact $mergefilelist($diffmergeid) $fname]
+    } elseif {[regexp {^@@ -([0-9]+),([0-9]+) \+([0-9]+),([0-9]+) @@(.*)} \
+		   $line match f1l f1c f2l f2c rest]} {
+	if {[info exists currentfile($ids)] && $currentfile($ids) >= 0} {
+	    # start of a new hunk
+	    if {$f1l == 0 && $f1c == 0} {
+		set f1l 1
+	    }
+	    if {$f2l == 0 && $f2c == 0} {
+		set f2l 1
+	    }
+	    set diffinhunk($ids) 1
+	    set diffoldstart($ids) $f1l
+	    set diffnewstart($ids) $f2l
+	    set diffoldlno($ids) $f1l
+	    set diffnewlno($ids) $f2l
+	    set difflcounts($ids) {}
+	    set noldlines($ids) 0
+	    set nnewlines($ids) 0
+	}
+    }
+}
+
+proc processhunks {} {
+    global diffmergeid parents nparents currenthunk
+    global mergefilelist diffblocked mergefds
+    global grouphunks grouplinestart grouplineend groupfilenum
+
+    set nfiles [llength $mergefilelist($diffmergeid)]
+    while 1 {
+	set fi $nfiles
+	set lno 0
+	# look for the earliest hunk
+	foreach p $parents($diffmergeid) {
+	    set ids [list $diffmergeid $p]
+	    if {![info exists currenthunk($ids)]} return
+	    set i [lindex $currenthunk($ids) 0]
+	    set l [lindex $currenthunk($ids) 2]
+	    if {$i < $fi || ($i == $fi && $l < $lno)} {
+		set fi $i
+		set lno $l
+		set pi $p
+	    }
+	}
+
+	if {$fi < $nfiles} {
+	    set ids [list $diffmergeid $pi]
+	    set hunk $currenthunk($ids)
+	    unset currenthunk($ids)
+	    if {$diffblocked($ids) > 0} {
+		fileevent $mergefds($ids) readable \
+		    [list getmergediffline $mergefds($ids) $ids $diffmergeid]
+	    }
+	    set diffblocked($ids) 0
+
+	    if {[info exists groupfilenum] && $groupfilenum == $fi
+		&& $lno <= $grouplineend} {
+		# add this hunk to the pending group
+		lappend grouphunks($pi) $hunk
+		set endln [lindex $hunk 4]
+		if {$endln > $grouplineend} {
+		    set grouplineend $endln
+		}
+		continue
+	    }
+	}
+
+	# succeeding stuff doesn't belong in this group, so
+	# process the group now
+	if {[info exists groupfilenum]} {
+	    processgroup
+	    unset groupfilenum
+	    unset grouphunks
+	}
+
+	if {$fi >= $nfiles} break
+
+	# start a new group
+	set groupfilenum $fi
+	set grouphunks($pi) [list $hunk]
+	set grouplinestart $lno
+	set grouplineend [lindex $hunk 4]
+    }
+}
+
+proc processgroup {} {
+    global groupfilelast groupfilenum difffilestart
+    global mergefilelist diffmergeid ctext filelines
+    global parents diffmergeid diffoffset
+    global grouphunks grouplinestart grouplineend nparents
+    global mergemax
+
+    $ctext conf -state normal
+    set id $diffmergeid
+    set f $groupfilenum
+    if {$groupfilelast != $f} {
+	$ctext insert end "\n"
+	set here [$ctext index "end - 1c"]
+	set difffilestart($f) $here
+	set mark fmark.[expr {$f + 1}]
+	$ctext mark set $mark $here
+	$ctext mark gravity $mark left
+	set header [lindex $mergefilelist($id) $f]
+	set l [expr {(78 - [string length $header]) / 2}]
+	set pad [string range "----------------------------------------" 1 $l]
+	$ctext insert end "$pad $header $pad\n" filesep
+	set groupfilelast $f
+	foreach p $parents($id) {
+	    set diffoffset($p) 0
+	}
+    }
+
+    $ctext insert end "@@" msep
+    set nlines [expr {$grouplineend - $grouplinestart}]
+    set events {}
+    set pnum 0
+    foreach p $parents($id) {
+	set startline [expr {$grouplinestart + $diffoffset($p)}]
+	set ol $startline
+	set nl $grouplinestart
+	if {[info exists grouphunks($p)]} {
+	    foreach h $grouphunks($p) {
+		set l [lindex $h 2]
+		if {$nl < $l} {
+		    for {} {$nl < $l} {incr nl} {
+			set filelines($p,$f,$ol) $filelines($id,$f,$nl)
+			incr ol
+		    }
+		}
+		foreach chunk [lindex $h 5] {
+		    if {[llength $chunk] == 2} {
+			set olc [lindex $chunk 0]
+			set nlc [lindex $chunk 1]
+			set nnl [expr {$nl + $nlc}]
+			lappend events [list $nl $nnl $pnum $olc $nlc]
+			incr ol $olc
+			set nl $nnl
+		    } else {
+			incr ol [lindex $chunk 0]
+			incr nl [lindex $chunk 0]
+		    }
+		}
+	    }
+	}
+	if {$nl < $grouplineend} {
+	    for {} {$nl < $grouplineend} {incr nl} {
+		set filelines($p,$f,$ol) $filelines($id,$f,$nl)
+		incr ol
+	    }
+	}
+	set nlines [expr {$ol - $startline}]
+	$ctext insert end " -$startline,$nlines" msep
+	incr pnum
+    }
+
+    set nlines [expr {$grouplineend - $grouplinestart}]
+    $ctext insert end " +$grouplinestart,$nlines @@\n" msep
+
+    set events [lsort -integer -index 0 $events]
+    set nevents [llength $events]
+    set nmerge $nparents($diffmergeid)
+    set l $grouplinestart
+    for {set i 0} {$i < $nevents} {set i $j} {
+	set nl [lindex $events $i 0]
+	while {$l < $nl} {
+	    $ctext insert end " $filelines($id,$f,$l)\n"
+	    incr l
+	}
+	set e [lindex $events $i]
+	set enl [lindex $e 1]
+	set j $i
+	set active {}
+	while 1 {
+	    set pnum [lindex $e 2]
+	    set olc [lindex $e 3]
+	    set nlc [lindex $e 4]
+	    if {![info exists delta($pnum)]} {
+		set delta($pnum) [expr {$olc - $nlc}]
+		lappend active $pnum
+	    } else {
+		incr delta($pnum) [expr {$olc - $nlc}]
+	    }
+	    if {[incr j] >= $nevents} break
+	    set e [lindex $events $j]
+	    if {[lindex $e 0] >= $enl} break
+	    if {[lindex $e 1] > $enl} {
+		set enl [lindex $e 1]
+	    }
+	}
+	set nlc [expr {$enl - $l}]
+	set ncol mresult
+	set bestpn -1
+	if {[llength $active] == $nmerge - 1} {
+	    # no diff for one of the parents, i.e. it's identical
+	    for {set pnum 0} {$pnum < $nmerge} {incr pnum} {
+		if {![info exists delta($pnum)]} {
+		    if {$pnum < $mergemax} {
+			lappend ncol m$pnum
+		    } else {
+			lappend ncol mmax
+		    }
+		    break
+		}
+	    }
+	} elseif {[llength $active] == $nmerge} {
+	    # all parents are different, see if one is very similar
+	    set bestsim 30
+	    for {set pnum 0} {$pnum < $nmerge} {incr pnum} {
+		set sim [similarity $pnum $l $nlc $f \
+			     [lrange $events $i [expr {$j-1}]]]
+		if {$sim > $bestsim} {
+		    set bestsim $sim
+		    set bestpn $pnum
+		}
+	    }
+	    if {$bestpn >= 0} {
+		lappend ncol m$bestpn
+	    }
+	}
+	set pnum -1
+	foreach p $parents($id) {
+	    incr pnum
+	    if {![info exists delta($pnum)] || $pnum == $bestpn} continue
+	    set olc [expr {$nlc + $delta($pnum)}]
+	    set ol [expr {$l + $diffoffset($p)}]
+	    incr diffoffset($p) $delta($pnum)
+	    unset delta($pnum)
+	    for {} {$olc > 0} {incr olc -1} {
+		$ctext insert end "-$filelines($p,$f,$ol)\n" m$pnum
+		incr ol
+	    }
+	}
+	set endl [expr {$l + $nlc}]
+	if {$bestpn >= 0} {
+	    # show this pretty much as a normal diff
+	    set p [lindex $parents($id) $bestpn]
+	    set ol [expr {$l + $diffoffset($p)}]
+	    incr diffoffset($p) $delta($bestpn)
+	    unset delta($bestpn)
+	    for {set k $i} {$k < $j} {incr k} {
+		set e [lindex $events $k]
+		if {[lindex $e 2] != $bestpn} continue
+		set nl [lindex $e 0]
+		set ol [expr {$ol + $nl - $l}]
+		for {} {$l < $nl} {incr l} {
+		    $ctext insert end "+$filelines($id,$f,$l)\n" $ncol
+		}
+		set c [lindex $e 3]
+		for {} {$c > 0} {incr c -1} {
+		    $ctext insert end "-$filelines($p,$f,$ol)\n" m$bestpn
+		    incr ol
+		}
+		set nl [lindex $e 1]
+		for {} {$l < $nl} {incr l} {
+		    $ctext insert end "+$filelines($id,$f,$l)\n" mresult
+		}
+	    }
+	}
+	for {} {$l < $endl} {incr l} {
+	    $ctext insert end "+$filelines($id,$f,$l)\n" $ncol
+	}
+    }
+    while {$l < $grouplineend} {
+	$ctext insert end " $filelines($id,$f,$l)\n"
+	incr l
+    }
+    $ctext conf -state disabled
+}
+
+proc similarity {pnum l nlc f events} {
+    global diffmergeid parents diffoffset filelines
+
+    set id $diffmergeid
+    set p [lindex $parents($id) $pnum]
+    set ol [expr {$l + $diffoffset($p)}]
+    set endl [expr {$l + $nlc}]
+    set same 0
+    set diff 0
+    foreach e $events {
+	if {[lindex $e 2] != $pnum} continue
+	set nl [lindex $e 0]
+	set ol [expr {$ol + $nl - $l}]
+	for {} {$l < $nl} {incr l} {
+	    incr same [string length $filelines($id,$f,$l)]
+	    incr same
+	}
+	set oc [lindex $e 3]
+	for {} {$oc > 0} {incr oc -1} {
+	    incr diff [string length $filelines($p,$f,$ol)]
+	    incr diff
+	    incr ol
+	}
+	set nl [lindex $e 1]
+	for {} {$l < $nl} {incr l} {
+	    incr diff [string length $filelines($id,$f,$l)]
+	    incr diff
+	}
+    }
+    for {} {$l < $endl} {incr l} {
+	incr same [string length $filelines($id,$f,$l)]
+	incr same
+    }
+    if {$same == 0} {
+	return 0
+    }
+    return [expr {200 * $same / (2 * $same + $diff)}]
+}
+
+proc startdiff {ids} {
+    global treediffs diffids treepending diffmergeid
+
+    set diffids $ids
+    catch {unset diffmergeid}
+    if {![info exists treediffs($ids)]} {
+	if {![info exists treepending]} {
+	    gettreediffs $ids
+	}
+    } else {
+	addtocflist $ids
+    }
+}
+
+proc addtocflist {ids} {
+    global treediffs cflist
+    foreach f $treediffs($ids) {
+	$cflist insert end $f
+    }
+    getblobdiffs $ids
+}
+
+proc gettreediffs {ids} {
+    global treediff parents treepending env
+    set treepending $ids
+    set treediff {}
+    set id [lindex $ids 0]
+    set p [lindex $ids 1]
+    if [catch {set gdtf [open "|{$env(HG)} --config ui.report_untrusted=false debug-diff-tree -r $p $id" r]}] return
+    fconfigure $gdtf -blocking 0
+    fileevent $gdtf readable [list gettreediffline $gdtf $ids]
+}
+
+proc gettreediffline {gdtf ids} {
+    global treediff treediffs treepending diffids diffmergeid
+
+    set n [gets $gdtf line]
+    if {$n < 0} {
+	if {![eof $gdtf]} return
+	close $gdtf
+	set treediffs($ids) $treediff
+	unset treepending
+	if {$ids != $diffids} {
+	    gettreediffs $diffids
+	} else {
+	    if {[info exists diffmergeid]} {
+		contmergediff $ids
+	    } else {
+		addtocflist $ids
+	    }
+	}
+	return
+    }
+    set tab1 [expr [string first "\t" $line] + 1]
+    set tab2 [expr [string first "\t" $line $tab1] - 1]
+    set file [string range $line $tab1 $tab2]
+    lappend treediff $file
+}
+
+proc getblobdiffs {ids} {
+    global diffopts blobdifffd diffids env curdifftag curtagstart
+    global difffilestart nextupdate diffinhdr treediffs
+
+    set id [lindex $ids 0]
+    set p [lindex $ids 1]
+    set env(GIT_DIFF_OPTS) $diffopts
+    set cmd [list | $env(HG) --config ui.report_untrusted=false debug-diff-tree -r -p -C $p $id]
+    if {[catch {set bdf [open $cmd r]} err]} {
+	puts "error getting diffs: $err"
+	return
+    }
+    set diffinhdr 0
+    fconfigure $bdf -blocking 0
+    set blobdifffd($ids) $bdf
+    set curdifftag Comments
+    set curtagstart 0.0
+    catch {unset difffilestart}
+    fileevent $bdf readable [list getblobdiffline $bdf $diffids]
+    set nextupdate [expr {[clock clicks -milliseconds] + 100}]
+}
+
+proc getblobdiffline {bdf ids} {
+    global diffids blobdifffd ctext curdifftag curtagstart
+    global diffnexthead diffnextnote difffilestart
+    global nextupdate diffinhdr treediffs
+    global gaudydiff
+
+    set n [gets $bdf line]
+    if {$n < 0} {
+	if {[eof $bdf]} {
+	    close $bdf
+	    if {$ids == $diffids && $bdf == $blobdifffd($ids)} {
+		$ctext tag add $curdifftag $curtagstart end
+	    }
+	}
+	return
+    }
+    if {$ids != $diffids || $bdf != $blobdifffd($ids)} {
+	return
+    }
+    regsub -all "\r" $line "" line
+    $ctext conf -state normal
+    if {[regexp {^diff --git a/(.*) b/(.*)} $line match fname newname]} {
+	# start of a new file
+	$ctext insert end "\n"
+	$ctext tag add $curdifftag $curtagstart end
+	set curtagstart [$ctext index "end - 1c"]
+	set header $newname
+	set here [$ctext index "end - 1c"]
+	set i [lsearch -exact $treediffs($diffids) $fname]
+	if {$i >= 0} {
+	    set difffilestart($i) $here
+	    incr i
+	    $ctext mark set fmark.$i $here
+	    $ctext mark gravity fmark.$i left
+	}
+	if {$newname != $fname} {
+	    set i [lsearch -exact $treediffs($diffids) $newname]
+	    if {$i >= 0} {
+		set difffilestart($i) $here
+		incr i
+		$ctext mark set fmark.$i $here
+		$ctext mark gravity fmark.$i left
+	    }
+	}
+	set curdifftag "f:$fname"
+	$ctext tag delete $curdifftag
+	set l [expr {(78 - [string length $header]) / 2}]
+	set pad [string range "----------------------------------------" 1 $l]
+	$ctext insert end "$pad $header $pad\n" filesep
+	set diffinhdr 1
+    } elseif {[regexp {^(---|\+\+\+) } $line] && $diffinhdr} {
+	set diffinhdr 1
+    } elseif {[regexp {^@@ -([0-9]+),([0-9]+) \+([0-9]+),([0-9]+) @@(.*)} \
+		   $line match f1l f1c f2l f2c rest]} {
+	if {$gaudydiff} {
+	    $ctext insert end "\t" hunksep
+	    $ctext insert end "    $f1l    " d0 "    $f2l    " d1
+	    $ctext insert end "    $rest \n" hunksep
+	} else {
+	    $ctext insert end "$line\n" hunksep
+	}
+	set diffinhdr 0
+    } else {
+	set x [string range $line 0 0]
+	if {$x == "-" || $x == "+"} {
+	    set tag [expr {$x == "+"}]
+	    if {$gaudydiff} {
+		set line [string range $line 1 end]
+	    }
+	    $ctext insert end "$line\n" d$tag
+	} elseif {$x == " "} {
+	    if {$gaudydiff} {
+		set line [string range $line 1 end]
+	    }
+	    $ctext insert end "$line\n"
+	} elseif {$diffinhdr || $x == "\\"} {
+	    # e.g. "\ No newline at end of file"
+	    $ctext insert end "$line\n" filesep
+	} elseif  {$line != ""} {
+	    # Something else we don't recognize
+	    if {$curdifftag != "Comments"} {
+		$ctext insert end "\n"
+		$ctext tag add $curdifftag $curtagstart end
+		set curtagstart [$ctext index "end - 1c"]
+		set curdifftag Comments
+	    }
+	    $ctext insert end "$line\n" filesep
+	}
+    }
+    $ctext conf -state disabled
+    if {[clock clicks -milliseconds] >= $nextupdate} {
+	incr nextupdate 100
+	fileevent $bdf readable {}
+	update
+	fileevent $bdf readable "getblobdiffline $bdf {$ids}"
+    }
+}
+
+proc nextfile {} {
+    global difffilestart ctext
+    set here [$ctext index @0,0]
+    for {set i 0} {[info exists difffilestart($i)]} {incr i} {
+	if {[$ctext compare $difffilestart($i) > $here]} {
+	    if {![info exists pos]
+		|| [$ctext compare $difffilestart($i) < $pos]} {
+		set pos $difffilestart($i)
+	    }
+	}
+    }
+    if {[info exists pos]} {
+	$ctext yview $pos
+    }
+}
+
+proc listboxsel {} {
+    global ctext cflist currentid
+    if {![info exists currentid]} return
+    set sel [lsort [$cflist curselection]]
+    if {$sel eq {}} return
+    set first [lindex $sel 0]
+    catch {$ctext yview fmark.$first}
+}
+
+proc setcoords {} {
+    global linespc charspc canvx0 canvy0 mainfont
+    global xspc1 xspc2 lthickness
+
+    set linespc [font metrics $mainfont -linespace]
+    set charspc [font measure $mainfont "m"]
+    set canvy0 [expr 3 + 0.5 * $linespc]
+    set canvx0 [expr 3 + 0.5 * $linespc]
+    set lthickness [expr {int($linespc / 9) + 1}]
+    set xspc1(0) $linespc
+    set xspc2 $linespc
+}
+
+proc redisplay {} {
+    global stopped redisplaying phase
+    if {$stopped > 1} return
+    if {$phase == "getcommits"} return
+    set redisplaying 1
+    if {$phase == "drawgraph" || $phase == "incrdraw"} {
+	set stopped 1
+    } else {
+	drawgraph
+    }
+}
+
+proc incrfont {inc} {
+    global mainfont namefont textfont ctext canv phase
+    global stopped entries curidfont
+    unmarkmatches
+    set mainfont [lreplace $mainfont 1 1 [expr {[lindex $mainfont 1] + $inc}]]
+    set curidfont [lreplace $curidfont 1 1 [expr {[lindex $curidfont 1] + $inc}]]
+    set namefont [lreplace $namefont 1 1 [expr {[lindex $namefont 1] + $inc}]]
+    set textfont [lreplace $textfont 1 1 [expr {[lindex $textfont 1] + $inc}]]
+    setcoords
+    $ctext conf -font $textfont
+    $ctext tag conf filesep -font [concat $textfont bold]
+    foreach e $entries {
+	$e conf -font $mainfont
+    }
+    if {$phase == "getcommits"} {
+	$canv itemconf textitems -font $mainfont
+    }
+    redisplay
+}
+
+proc clearsha1 {} {
+    global sha1entry sha1string
+    if {[string length $sha1string] == 40} {
+	$sha1entry delete 0 end
+    }
+}
+
+proc sha1change {n1 n2 op} {
+    global sha1string currentid sha1but
+    if {$sha1string == {}
+	|| ([info exists currentid] && $sha1string == $currentid)} {
+	set state disabled
+    } else {
+	set state normal
+    }
+    if {[$sha1but cget -state] == $state} return
+    if {$state == "normal"} {
+	$sha1but conf -state normal -relief raised -text "Goto: "
+    } else {
+	$sha1but conf -state disabled -relief flat -text "SHA1 ID: "
+    }
+}
+
+proc gotocommit {} {
+    global sha1string currentid idline tagids
+    global lineid numcommits
+
+    if {$sha1string == {}
+	|| ([info exists currentid] && $sha1string == $currentid)} return
+    if {[info exists tagids($sha1string)]} {
+	set id $tagids($sha1string)
+    } else {
+	set id [string tolower $sha1string]
+	if {[regexp {^[0-9a-f]{4,39}$} $id]} {
+	    set matches {}
+	    for {set l 0} {$l < $numcommits} {incr l} {
+		if {[string match $id* $lineid($l)]} {
+		    lappend matches $lineid($l)
+		}
+	    }
+	    if {$matches ne {}} {
+		if {[llength $matches] > 1} {
+		    error_popup "Short SHA1 id $id is ambiguous"
+		    return
+		}
+		set id [lindex $matches 0]
+	    }
+	}
+    }
+    if {[info exists idline($id)]} {
+	selectline $idline($id) 1
+	return
+    }
+    if {[regexp {^[0-9a-fA-F]{4,}$} $sha1string]} {
+	set type "SHA1 id"
+    } else {
+	set type "Tag"
+    }
+    error_popup "$type $sha1string is not known"
+}
+
+proc lineenter {x y id} {
+    global hoverx hovery hoverid hovertimer
+    global commitinfo canv
+
+    if {![info exists commitinfo($id)]} return
+    set hoverx $x
+    set hovery $y
+    set hoverid $id
+    if {[info exists hovertimer]} {
+	after cancel $hovertimer
+    }
+    set hovertimer [after 500 linehover]
+    $canv delete hover
+}
+
+proc linemotion {x y id} {
+    global hoverx hovery hoverid hovertimer
+
+    if {[info exists hoverid] && $id == $hoverid} {
+	set hoverx $x
+	set hovery $y
+	if {[info exists hovertimer]} {
+	    after cancel $hovertimer
+	}
+	set hovertimer [after 500 linehover]
+    }
+}
+
+proc lineleave {id} {
+    global hoverid hovertimer canv
+
+    if {[info exists hoverid] && $id == $hoverid} {
+	$canv delete hover
+	if {[info exists hovertimer]} {
+	    after cancel $hovertimer
+	    unset hovertimer
+	}
+	unset hoverid
+    }
+}
+
+proc linehover {} {
+    global hoverx hovery hoverid hovertimer
+    global canv linespc lthickness
+    global commitinfo mainfont
+
+    set text [lindex $commitinfo($hoverid) 0]
+    set ymax [lindex [$canv cget -scrollregion] 3]
+    if {$ymax == {}} return
+    set yfrac [lindex [$canv yview] 0]
+    set x [expr {$hoverx + 2 * $linespc}]
+    set y [expr {$hovery + $yfrac * $ymax - $linespc / 2}]
+    set x0 [expr {$x - 2 * $lthickness}]
+    set y0 [expr {$y - 2 * $lthickness}]
+    set x1 [expr {$x + [font measure $mainfont $text] + 2 * $lthickness}]
+    set y1 [expr {$y + $linespc + 2 * $lthickness}]
+    set t [$canv create rectangle $x0 $y0 $x1 $y1 \
+	       -fill \#ffff80 -outline black -width 1 -tags hover]
+    $canv raise $t
+    set t [$canv create text $x $y -anchor nw -text $text -tags hover]
+    $canv raise $t
+}
+
+proc clickisonarrow {id y} {
+    global mainline mainlinearrow sidelines lthickness
+
+    set thresh [expr {2 * $lthickness + 6}]
+    if {[info exists mainline($id)]} {
+	if {$mainlinearrow($id) ne "none"} {
+	    if {abs([lindex $mainline($id) 1] - $y) < $thresh} {
+		return "up"
+	    }
+	}
+    }
+    if {[info exists sidelines($id)]} {
+	foreach ls $sidelines($id) {
+	    set coords [lindex $ls 0]
+	    set arrow [lindex $ls 2]
+	    if {$arrow eq "first" || $arrow eq "both"} {
+		if {abs([lindex $coords 1] - $y) < $thresh} {
+		    return "up"
+		}
+	    }
+	    if {$arrow eq "last" || $arrow eq "both"} {
+		if {abs([lindex $coords end] - $y) < $thresh} {
+		    return "down"
+		}
+	    }
+	}
+    }
+    return {}
+}
+
+proc arrowjump {id dirn y} {
+    global mainline sidelines canv
+
+    set yt {}
+    if {$dirn eq "down"} {
+	if {[info exists mainline($id)]} {
+	    set y1 [lindex $mainline($id) 1]
+	    if {$y1 > $y} {
+		set yt $y1
+	    }
+	}
+	if {[info exists sidelines($id)]} {
+	    foreach ls $sidelines($id) {
+		set y1 [lindex $ls 0 1]
+		if {$y1 > $y && ($yt eq {} || $y1 < $yt)} {
+		    set yt $y1
+		}
+	    }
+	}
+    } else {
+	if {[info exists sidelines($id)]} {
+	    foreach ls $sidelines($id) {
+		set y1 [lindex $ls 0 end]
+		if {$y1 < $y && ($yt eq {} || $y1 > $yt)} {
+		    set yt $y1
+		}
+	    }
+	}
+    }
+    if {$yt eq {}} return
+    set ymax [lindex [$canv cget -scrollregion] 3]
+    if {$ymax eq {} || $ymax <= 0} return
+    set view [$canv yview]
+    set yspan [expr {[lindex $view 1] - [lindex $view 0]}]
+    set yfrac [expr {$yt / $ymax - $yspan / 2}]
+    if {$yfrac < 0} {
+	set yfrac 0
+    }
+    $canv yview moveto $yfrac
+}
+
+proc lineclick {x y id isnew} {
+    global ctext commitinfo children cflist canv thickerline
+
+    unmarkmatches
+    unselectline
+    normalline
+    $canv delete hover
+    # draw this line thicker than normal
+    drawlines $id 1
+    set thickerline $id
+    if {$isnew} {
+	set ymax [lindex [$canv cget -scrollregion] 3]
+	if {$ymax eq {}} return
+	set yfrac [lindex [$canv yview] 0]
+	set y [expr {$y + $yfrac * $ymax}]
+    }
+    set dirn [clickisonarrow $id $y]
+    if {$dirn ne {}} {
+	arrowjump $id $dirn $y
+	return
+    }
+
+    if {$isnew} {
+	addtohistory [list lineclick $x $y $id 0]
+    }
+    # fill the details pane with info about this line
+    $ctext conf -state normal
+    $ctext delete 0.0 end
+    $ctext tag conf link -foreground blue -underline 1
+    $ctext tag bind link <Enter> { %W configure -cursor hand2 }
+    $ctext tag bind link <Leave> { %W configure -cursor $curtextcursor }
+    $ctext insert end "Parent:\t"
+    $ctext insert end $id [list link link0]
+    $ctext tag bind link0 <1> [list selbyid $id]
+    set info $commitinfo($id)
+    $ctext insert end "\n\t[lindex $info 0]\n"
+    $ctext insert end "\tUser:\t[lindex $info 1]\n"
+    $ctext insert end "\tDate:\t[lindex $info 2]\n"
+    if {[info exists children($id)]} {
+	$ctext insert end "\nChildren:"
+	set i 0
+	foreach child $children($id) {
+	    incr i
+	    set info $commitinfo($child)
+	    $ctext insert end "\n\t"
+	    $ctext insert end $child [list link link$i]
+	    $ctext tag bind link$i <1> [list selbyid $child]
+	    $ctext insert end "\n\t[lindex $info 0]"
+	    $ctext insert end "\n\tUser:\t[lindex $info 1]"
+	    $ctext insert end "\n\tDate:\t[lindex $info 2]\n"
+	}
+    }
+    $ctext conf -state disabled
+
+    $cflist delete 0 end
+}
+
+proc normalline {} {
+    global thickerline
+    if {[info exists thickerline]} {
+	drawlines $thickerline 0
+	unset thickerline
+    }
+}
+
+proc selbyid {id} {
+    global idline
+    if {[info exists idline($id)]} {
+	selectline $idline($id) 1
+    }
+}
+
+proc mstime {} {
+    global startmstime
+    if {![info exists startmstime]} {
+	set startmstime [clock clicks -milliseconds]
+    }
+    return [format "%.3f" [expr {([clock click -milliseconds] - $startmstime) / 1000.0}]]
+}
+
+proc rowmenu {x y id} {
+    global rowctxmenu idline selectedline rowmenuid hgvdiff
+
+    if {![info exists selectedline] || $idline($id) eq $selectedline} {
+	set state disabled
+    } else {
+	set state normal
+    }
+    $rowctxmenu entryconfigure 0 -state $state
+    $rowctxmenu entryconfigure 1 -state $state
+    $rowctxmenu entryconfigure 2 -state $state
+    if { $hgvdiff ne "" } {
+	$rowctxmenu entryconfigure 6 -state $state
+    }
+    set rowmenuid $id
+    tk_popup $rowctxmenu $x $y
+}
+
+proc diffvssel {dirn} {
+    global rowmenuid selectedline lineid
+
+    if {![info exists selectedline]} return
+    if {$dirn} {
+	set oldid $lineid($selectedline)
+	set newid $rowmenuid
+    } else {
+	set oldid $rowmenuid
+	set newid $lineid($selectedline)
+    }
+    addtohistory [list doseldiff $oldid $newid]
+    doseldiff $oldid $newid
+}
+
+proc doseldiff {oldid newid} {
+    global ctext cflist
+    global commitinfo
+
+    $ctext conf -state normal
+    $ctext delete 0.0 end
+    $ctext mark set fmark.0 0.0
+    $ctext mark gravity fmark.0 left
+    $cflist delete 0 end
+    $cflist insert end "Top"
+    $ctext insert end "From "
+    $ctext tag conf link -foreground blue -underline 1
+    $ctext tag bind link <Enter> { %W configure -cursor hand2 }
+    $ctext tag bind link <Leave> { %W configure -cursor $curtextcursor }
+    $ctext tag bind link0 <1> [list selbyid $oldid]
+    $ctext insert end $oldid [list link link0]
+    $ctext insert end "\n     "
+    $ctext insert end [lindex $commitinfo($oldid) 0]
+    $ctext insert end "\n\nTo   "
+    $ctext tag bind link1 <1> [list selbyid $newid]
+    $ctext insert end $newid [list link link1]
+    $ctext insert end "\n     "
+    $ctext insert end [lindex $commitinfo($newid) 0]
+    $ctext insert end "\n"
+    $ctext conf -state disabled
+    $ctext tag delete Comments
+    $ctext tag remove found 1.0 end
+    startdiff [list $newid $oldid]
+}
+
+proc mkpatch {} {
+    global rowmenuid currentid commitinfo patchtop patchnum
+
+    if {![info exists currentid]} return
+    set oldid $currentid
+    set oldhead [lindex $commitinfo($oldid) 0]
+    set newid $rowmenuid
+    set newhead [lindex $commitinfo($newid) 0]
+    set top .patch
+    set patchtop $top
+    catch {destroy $top}
+    toplevel $top
+    ttk::label $top.from -text "From:"
+    ttk::entry $top.fromsha1 -width 40
+    $top.fromsha1 insert 0 $oldid
+    $top.fromsha1 conf -state readonly
+    grid $top.from $top.fromsha1 -sticky w -pady {10 0}
+    ttk::entry $top.fromhead -width 60
+    $top.fromhead insert 0 $oldhead
+    $top.fromhead conf -state readonly
+    grid x $top.fromhead -sticky w
+    ttk::label $top.to -text "To:"
+    ttk::entry $top.tosha1 -width 40
+    $top.tosha1 insert 0 $newid
+    $top.tosha1 conf -state readonly
+    grid $top.to $top.tosha1 -sticky w
+    ttk::entry $top.tohead -width 60
+    $top.tohead insert 0 $newhead
+    $top.tohead conf -state readonly
+    grid x $top.tohead -sticky w
+    ttk::button $top.rev -text "Reverse" -command mkpatchrev
+    grid $top.rev x -pady 10
+    ttk::label $top.flab -text "Output file:"
+    ttk::entry $top.fname -width 60
+    $top.fname insert 0 [file normalize "patch$patchnum.patch"]
+    incr patchnum
+    grid $top.flab $top.fname -sticky w
+    ttk::frame $top.buts
+    ttk::button $top.buts.gen -text "Generate" -command mkpatchgo
+    ttk::button $top.buts.can -text "Cancel" -command mkpatchcan
+    grid $top.buts.gen $top.buts.can
+    grid columnconfigure $top.buts 0 -weight 1 -uniform a
+    grid columnconfigure $top.buts 1 -weight 1 -uniform a
+    grid $top.buts - -pady 10 -sticky ew
+    focus $top.fname
+    popupify $top
+    wm title $top "Generate a patch"
+}
+
+proc mkpatchrev {} {
+    global patchtop
+
+    set oldid [$patchtop.fromsha1 get]
+    set oldhead [$patchtop.fromhead get]
+    set newid [$patchtop.tosha1 get]
+    set newhead [$patchtop.tohead get]
+    foreach e [list fromsha1 fromhead tosha1 tohead] \
+	    v [list $newid $newhead $oldid $oldhead] {
+	$patchtop.$e conf -state normal
+	$patchtop.$e delete 0 end
+	$patchtop.$e insert 0 $v
+	$patchtop.$e conf -state readonly
+    }
+}
+
+proc mkpatchgo {} {
+    global patchtop env
+
+    set oldid [$patchtop.fromsha1 get]
+    set newid [$patchtop.tosha1 get]
+    set fname [$patchtop.fname get]
+    if {[catch {exec $env(HG) --config ui.report_untrusted=false debug-diff-tree -p $oldid $newid >$fname &} err]} {
+	error_popup "Error creating patch: $err"
+    }
+    catch {destroy $patchtop}
+    unset patchtop
+}
+
+proc mkpatchcan {} {
+    global patchtop
+
+    catch {destroy $patchtop}
+    unset patchtop
+}
+
+proc mktag {} {
+    global rowmenuid mktagtop commitinfo
+
+    set top .maketag
+    set mktagtop $top
+    catch {destroy $top}
+    toplevel $top
+    ttk::label $top.id -text "ID:"
+    ttk::entry $top.sha1 -width 40
+    $top.sha1 insert 0 $rowmenuid
+    $top.sha1 conf -state readonly
+    grid $top.id $top.sha1 -sticky w -pady {10 0}
+    ttk::entry $top.head -width 60
+    $top.head insert 0 [lindex $commitinfo($rowmenuid) 0]
+    $top.head conf -state readonly
+    grid x $top.head -sticky w
+    ttk::label $top.tlab -text "Tag name:"
+    ttk::entry $top.tag -width 60
+    grid $top.tlab $top.tag -sticky w
+    ttk::frame $top.buts
+    ttk::button $top.buts.gen -text "Create" -command mktaggo
+    ttk::button $top.buts.can -text "Cancel" -command mktagcan
+    grid $top.buts.gen $top.buts.can
+    grid columnconfigure $top.buts 0 -weight 1 -uniform a
+    grid columnconfigure $top.buts 1 -weight 1 -uniform a
+    grid $top.buts - -pady 10 -sticky ew
+    focus $top.tag
+    popupify $top
+    wm title $top "Create a tag"
+}
+
+proc domktag {} {
+    global mktagtop env tagids idtags
+
+    set id [$mktagtop.sha1 get]
+    set tag [$mktagtop.tag get]
+    if {$tag == {}} {
+	error_popup "No tag name specified"
+	return
+    }
+    if {[info exists tagids($tag)]} {
+	error_popup "Tag \"$tag\" already exists"
+	return
+    }
+    if {[catch {
+	set out [exec $env(HG) --config ui.report_untrusted=false tag -r $id $tag]
+    } err]} {
+	error_popup "Error creating tag: $err"
+	return
+    }
+
+    set tagids($tag) $id
+    lappend idtags($id) $tag
+    redrawtags $id
+}
+
+proc redrawtags {id} {
+    global canv linehtag idline idpos selectedline
+
+    if {![info exists idline($id)]} return
+    $canv delete tag.$id
+    set xt [eval drawtags $id $idpos($id)]
+    $canv coords $linehtag($idline($id)) $xt [lindex $idpos($id) 2]
+    if {[info exists selectedline] && $selectedline == $idline($id)} {
+	selectline $selectedline 0
+    }
+}
+
+proc mktagcan {} {
+    global mktagtop
+
+    catch {destroy $mktagtop}
+    unset mktagtop
+}
+
+proc mktaggo {} {
+    domktag
+    mktagcan
+}
+
+proc writecommit {} {
+    global rowmenuid wrcomtop commitinfo
+
+    set top .writecommit
+    set wrcomtop $top
+    catch {destroy $top}
+    toplevel $top
+    ttk::label $top.id -text "ID:"
+    ttk::entry $top.sha1 -width 40
+    $top.sha1 insert 0 $rowmenuid
+    $top.sha1 conf -state readonly
+    grid $top.id $top.sha1 -sticky w -pady {10 0}
+    ttk::entry $top.head -width 60
+    $top.head insert 0 [lindex $commitinfo($rowmenuid) 0]
+    $top.head conf -state readonly
+    grid x $top.head -sticky w
+    ttk::label $top.flab -text "Output file:"
+    ttk::entry $top.fname -width 60
+    $top.fname insert 0 [file normalize "commit-[string range $rowmenuid 0 6].diff"]
+    grid $top.flab $top.fname -sticky w
+    ttk::frame $top.buts
+    ttk::button $top.buts.gen -text "Write" -command wrcomgo
+    ttk::button $top.buts.can -text "Cancel" -command wrcomcan
+    grid $top.buts.gen $top.buts.can
+    grid columnconfigure $top.buts 0 -weight 1 -uniform a
+    grid columnconfigure $top.buts 1 -weight 1 -uniform a
+    grid $top.buts - -pady 10 -sticky ew
+    focus $top.fname
+    popupify $top
+    wm title $top "Write commit to a file"
+}
+
+proc wrcomgo {} {
+    global wrcomtop
+
+    set id [$wrcomtop.sha1 get]
+    set fname [$wrcomtop.fname get]
+    if {[catch {exec $::env(HG) --config ui.report_untrusted=false export --git -o [string map {% %%} $fname] $id} err]} {
+	error_popup "Error writing commit: $err"
+    }
+    catch {destroy $wrcomtop}
+    unset wrcomtop
+}
+
+proc wrcomcan {} {
+    global wrcomtop
+
+    catch {destroy $wrcomtop}
+    unset wrcomtop
+}
+
+proc listrefs {id} {
+    global idtags idheads idotherrefs idbookmarks
+
+    set w {}
+    if {[info exists idbookmarks($id)]} {
+	set w $idbookmarks($id)
+    }
+    set x {}
+    if {[info exists idtags($id)]} {
+	set x $idtags($id)
+    }
+    set y {}
+    if {[info exists idheads($id)]} {
+	set y $idheads($id)
+    }
+    set z {}
+    if {[info exists idotherrefs($id)]} {
+	set z $idotherrefs($id)
+    }
+    return [list $w $x $y $z]
+}
+
+proc rereadrefs {} {
+    global idbookmarks idtags idheads idotherrefs
+    global bookmarkids tagids headids otherrefids
+
+    set refids [concat [array names idtags] \
+		    [array names idheads] [array names idotherrefs] \
+		    [array names idbookmarks]]
+    foreach id $refids {
+	if {![info exists ref($id)]} {
+	    set ref($id) [listrefs $id]
+	}
+    }
+    foreach v {tagids idtags headids idheads otherrefids idotherrefs \
+        bookmarkids idbookmarks} {
+	catch {unset $v}
+    }
+    readrefs
+    set refids [lsort -unique [concat $refids [array names idtags] \
+			[array names idheads] [array names idotherrefs] \
+			[array names idbookmarks]]]
+    foreach id $refids {
+	set v [listrefs $id]
+	if {![info exists ref($id)] || $ref($id) != $v} {
+	    redrawtags $id
+	}
+    }
+}
+
+proc vdiff {withparent} {
+    global env rowmenuid selectedline lineid hgvdiff
+
+    if {![info exists rowmenuid]} return
+    set curid $rowmenuid
+
+    if {$withparent} {
+	set parents [exec $env(HG) --config ui.report_untrusted=false parents --rev $curid --template "{node}\n"]
+	set firstparent [lindex [split $parents "\n"] 0]
+	set otherid $firstparent
+    } else {
+	if {![info exists selectedline]} return
+	set otherid $lineid($selectedline)
+    }
+    set range "$otherid:$curid"
+    if {[catch {exec $env(HG) --config ui.report_untrusted=false $hgvdiff -r $range} err]} {
+        # Ignore errors, this is just visualization
+    }
+}
+
+proc showtag {tag isnew} {
+    global ctext cflist tagcontents tagids linknum
+
+    if {$isnew} {
+	addtohistory [list showtag $tag 0]
+    }
+    $ctext conf -state normal
+    $ctext delete 0.0 end
+    set linknum 0
+    if {[info exists tagcontents($tag)]} {
+	set text $tagcontents($tag)
+    } else {
+	set text "Tag: $tag\nId:  $tagids($tag)"
+    }
+    appendwithlinks $text
+    $ctext conf -state disabled
+    $cflist delete 0 end
+}
+
+proc doquit {} {
+    global stopped
+    set stopped 100
+    destroy .
+}
+
+proc getconfig {} {
+    global env
+    set config {}
+
+    set lines [exec $env(HG) debugconfig]
+    foreach line [split $lines \n] {
+	set line [string trimright $line \r]
+	if {[string match hgk.* $line]} {
+	    regexp {(.*)=(.*)} $line - k v
+	    lappend config $k $v
+	}
+    }
+    return $config
+}
+
+# defaults...
+set datemode 0
+set boldnames 0
+set diffopts "-U 5 -p"
+
+set mainfont {Helvetica 9}
+set curidfont {}
+set textfont {Courier 9}
+set findmergefiles 0
+set gaudydiff 0
+set maxgraphpct 50
+set maxwidth 16
+
+set colors {green red blue magenta darkgrey brown orange}
+set authorcolors {
+    black blue deeppink mediumorchid blue burlywood4 goldenrod slateblue red2 navy dimgrey
+}
+set bgcolor white
+
+# This color should probably be some system color (provided by tk),
+# but as the bgcolor has always been set to white, I choose to ignore
+set fgcolor black
+set diffaddcolor "#00a000"
+set diffremcolor red
+set diffmerge1color red
+set diffmerge2color blue
+set hunksepcolor blue
+
+catch {source ~/.hgk}
+
+if {$curidfont == ""} {  # initialize late based on current mainfont
+    set curidfont "$mainfont bold italic underline"
+}
+
+set namefont $mainfont
+if {$boldnames} {
+    lappend namefont bold
+}
+
+set revtreeargs {}
+foreach arg $argv {
+    switch -regexp -- $arg {
+	"^$" { }
+	"^-b" { set boldnames 1 }
+	"^-d" { set datemode 1 }
+	default {
+	    lappend revtreeargs $arg
+	}
+    }
+}
+
+set history {}
+set historyindex 0
+
+set stopped 0
+set redisplaying 0
+set stuffsaved 0
+set patchnum 0
+
+set config(hgk.vdiff) ""
+array set config [getconfig]
+set hgvdiff $config(hgk.vdiff)
+setcoords
+makewindow
+readrefs
+set hgroot [exec $env(HG) root]
+wm title . "hgk $hgroot"
+getcommits $revtreeargs

contrib/hgperf

@@ -0,0 +1,97 b''
+#!/usr/bin/env python
+#
+# hgperf - measure performance of Mercurial commands
+#
+# Copyright 2014 Matt Mackall <[e-mail]>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+'''measure performance of Mercurial commands
+
+Using ``hgperf`` instead of ``hg`` measures performance of the target
+Mercurial command. For example, the execution below measures
+performance of :hg:`heads --topo`::
+
+    $ hgperf heads --topo
+
+All command output via ``ui`` is suppressed, and just measurement
+result is displayed: see also "perf" extension in "contrib".
+
+Costs of processing before dispatching to the command function like
+below are not measured::
+
+    - parsing command line (e.g. option validity check)
+    - reading configuration files in
+
+But ``pre-`` and ``post-`` hook invocation for the target command is
+measured, even though these are invoked before or after dispatching to
+the command function, because these may be required to repeat
+execution of the target command correctly.
+'''
+
+import os
+import sys
+
+libdir = '@LIBDIR@'
+
+if libdir != '@' 'LIBDIR' '@':
+    if not os.path.isabs(libdir):
+        libdir = os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                              libdir)
+        libdir = os.path.abspath(libdir)
+    sys.path.insert(0, libdir)
+
+# enable importing on demand to reduce startup time
+try:
+    from mercurial import demandimport; demandimport.enable()
+except ImportError:
+    import sys
+    sys.stderr.write("abort: couldn't find mercurial libraries in [%s]\n" %
+                     ' '.join(sys.path))
+    sys.stderr.write("(check your install and PYTHONPATH)\n")
+    sys.exit(-1)
+
+from mercurial import (
+    dispatch,
+    util,
+)
+
+def timer(func, title=None):
+    results = []
+    begin = util.timer()
+    count = 0
+    while True:
+        ostart = os.times()
+        cstart = util.timer()
+        r = func()
+        cstop = util.timer()
+        ostop = os.times()
+        count += 1
+        a, b = ostart, ostop
+        results.append((cstop - cstart, b[0] - a[0], b[1]-a[1]))
+        if cstop - begin > 3 and count >= 100:
+            break
+        if cstop - begin > 10 and count >= 3:
+            break
+    if title:
+        sys.stderr.write("! %s\n" % title)
+    if r:
+        sys.stderr.write("! result: %s\n" % r)
+    m = min(results)
+    sys.stderr.write("! wall %f comb %f user %f sys %f (best of %d)\n"
+                     % (m[0], m[1] + m[2], m[1], m[2], count))
+
+orgruncommand = dispatch.runcommand
+
+def runcommand(lui, repo, cmd, fullargs, ui, options, d, cmdpats, cmdoptions):
+    ui.pushbuffer()
+    lui.pushbuffer()
+    timer(lambda : orgruncommand(lui, repo, cmd, fullargs, ui,
+                                 options, d, cmdpats, cmdoptions))
+    ui.popbuffer()
+    lui.popbuffer()
+
+dispatch.runcommand = runcommand
+
+dispatch.run()

contrib/hgsh/Makefile

@@ -0,0 +1,13 b''
+CC := gcc
+CFLAGS := -g -O2 -Wall -Werror
+
+prefix ?= /usr/bin
+
+hgsh: hgsh.o
+	$(CC) -o $@ $<
+
+install: hgsh
+	install -m755 hgsh $(prefix)
+
+clean:
+	rm -f *.o hgsh

contrib/hgsh/hgsh.c

@@ -0,0 +1,438 b''
+/*
+ * hgsh.c - restricted login shell for mercurial
+ *
+ * Copyright 2006 Vadim Gelfer <[e-mail]>
+ *
+ * This software may be used and distributed according to the terms of the
+ * GNU General Public License, incorporated herein by reference.
+ *
+ * this program is login shell for dedicated mercurial user account. it
+ * only allows few actions:
+ *
+ * 1. run hg in server mode on specific repository. no other hg commands
+ * are allowed. we try to verify that repo to be accessed exists under
+ * given top-level directory.
+ *
+ * 2. (optional) forward ssh connection from firewall/gateway machine to
+ * "real" mercurial host, to let users outside intranet pull and push
+ * changes through firewall.
+ *
+ * 3. (optional) run normal shell, to allow to "su" to mercurial user, use
+ * "sudo" to run programs as that user, or run cron jobs as that user.
+ *
+ * only tested on linux yet. patches for non-linux systems welcome.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE /* for asprintf */
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+/*
+ * user config.
+ *
+ * if you see a hostname below, just use first part of hostname. example,
+ * if you have host named foo.bar.com, use "foo".
+ */
+
+/*
+ * HG_GATEWAY: hostname of gateway/firewall machine that people outside your
+ * intranet ssh into if they need to ssh to other machines. if you do not
+ * have such machine, set to NULL.
+ */
+#ifndef HG_GATEWAY
+#define HG_GATEWAY "gateway"
+#endif
+
+/*
+ * HG_HOST: hostname of mercurial server. if any machine is allowed, set to
+ * NULL.
+ */
+#ifndef HG_HOST
+#define HG_HOST "mercurial"
+#endif
+
+/*
+ * HG_USER: username to log in from HG_GATEWAY to HG_HOST. if gateway and
+ * host username are same, set to NULL.
+ */
+#ifndef HG_USER
+#define HG_USER "hg"
+#endif
+
+/*
+ * HG_ROOT: root of tree full of mercurial repos. if you do not want to
+ * validate location of repo when someone is try to access, set to NULL.
+ */
+#ifndef HG_ROOT
+#define HG_ROOT "/home/hg/repos"
+#endif
+
+/*
+ * HG: path to the mercurial executable to run.
+ */
+#ifndef HG
+#define HG "/home/hg/bin/hg"
+#endif
+
+/*
+ * HG_SHELL: shell to use for actions like "sudo" and "su" access to
+ * mercurial user, and cron jobs. if you want to make these things
+ * impossible, set to NULL.
+ */
+#ifndef HG_SHELL
+#define HG_SHELL NULL
+/* #define HG_SHELL        "/bin/bash" */
+#endif
+
+/*
+ * HG_HELP: some way for users to get support if they have problem. if they
+ * should not get helpful message, set to NULL.
+ */
+#ifndef HG_HELP
+#define HG_HELP "please contact [e-mail] for help."
+#endif
+
+/*
+ * SSH: path to ssh executable to run, if forwarding from HG_GATEWAY to
+ * HG_HOST. if you want to use rsh instead (why?), you need to modify
+ * arguments it is called with. see forward_through_gateway.
+ */
+#ifndef SSH
+#define SSH "/usr/bin/ssh"
+#endif
+
+/*
+ * tell whether to print command that is to be executed. useful for
+ * debugging. should not interfere with mercurial operation, since
+ * mercurial only cares about stdin and stdout, and this prints to stderr.
+ */
+static const int debug = 0;
+
+static void print_cmdline(int argc, char **argv)
+{
+	FILE *fp = stderr;
+	int i;
+
+	fputs("command: ", fp);
+
+	for (i = 0; i < argc; i++) {
+		char *spc = strpbrk(argv[i], " \t\r\n");
+		if (spc) {
+			fputc('\'', fp);
+		}
+		fputs(argv[i], fp);
+		if (spc) {
+			fputc('\'', fp);
+		}
+		if (i < argc - 1) {
+			fputc(' ', fp);
+		}
+	}
+	fputc('\n', fp);
+	fflush(fp);
+}
+
+static void usage(const char *reason, int exitcode)
+{
+	char *hg_help = HG_HELP;
+
+	if (reason) {
+		fprintf(stderr, "*** Error: %s.\n", reason);
+	}
+	fprintf(stderr, "*** This program has been invoked incorrectly.\n");
+	if (hg_help) {
+		fprintf(stderr, "*** %s\n", hg_help);
+	}
+	exit(exitcode ? exitcode : EX_USAGE);
+}
+
+/*
+ * run on gateway host to make another ssh connection, to "real" mercurial
+ * server. it sends its command line unmodified to far end.
+ *
+ * never called if HG_GATEWAY is NULL.
+ */
+static void forward_through_gateway(int argc, char **argv)
+{
+	char *ssh = SSH;
+	char *hg_host = HG_HOST;
+	char *hg_user = HG_USER;
+	char **nargv = alloca((10 + argc) * sizeof(char *));
+	int i = 0, j;
+
+	nargv[i++] = ssh;
+	nargv[i++] = "-q";
+	nargv[i++] = "-T";
+	nargv[i++] = "-x";
+	if (hg_user) {
+		nargv[i++] = "-l";
+		nargv[i++] = hg_user;
+	}
+	nargv[i++] = hg_host;
+
+	/*
+	 * sshd called us with added "-c", because it thinks we are a shell.
+	 * drop it if we find it.
+	 */
+	j = 1;
+	if (j < argc && strcmp(argv[j], "-c") == 0) {
+		j++;
+	}
+
+	for (; j < argc; i++, j++) {
+		nargv[i] = argv[j];
+	}
+	nargv[i] = NULL;
+
+	if (debug) {
+		print_cmdline(i, nargv);
+	}
+
+	execv(ssh, nargv);
+	perror(ssh);
+	exit(EX_UNAVAILABLE);
+}
+
+/*
+ * run shell. let administrator "su" to mercurial user's account to do
+ * administrative works.
+ *
+ * never called if HG_SHELL is NULL.
+ */
+static void run_shell(int argc, char **argv)
+{
+	char *hg_shell = HG_SHELL;
+	char **nargv;
+	char *c;
+	int i;
+
+	nargv = alloca((argc + 3) * sizeof(char *));
+	c = strrchr(hg_shell, '/');
+
+	/* tell "real" shell it is login shell, if needed. */
+
+	if (argv[0][0] == '-' && c) {
+		nargv[0] = strdup(c);
+		if (nargv[0] == NULL) {
+			perror("malloc");
+			exit(EX_OSERR);
+		}
+		nargv[0][0] = '-';
+	} else {
+		nargv[0] = hg_shell;
+	}
+
+	for (i = 1; i < argc; i++) {
+		nargv[i] = argv[i];
+	}
+	nargv[i] = NULL;
+
+	if (debug) {
+		print_cmdline(i, nargv);
+	}
+
+	execv(hg_shell, nargv);
+	perror(hg_shell);
+	exit(EX_OSFILE);
+}
+
+enum cmdline {
+	hg_init,
+	hg_serve,
+};
+
+/*
+ * attempt to verify that a directory is really a hg repo, by testing
+ * for the existence of a subdirectory.
+ */
+static int validate_repo(const char *repo_root, const char *subdir)
+{
+	char *abs_path;
+	struct stat st;
+	int ret;
+
+	if (asprintf(&abs_path, "%s.hg/%s", repo_root, subdir) == -1) {
+		ret = -1;
+		goto bail;
+	}
+
+	/* verify that we really are looking at valid repo. */
+
+	if (stat(abs_path, &st) == -1) {
+		ret = 0;
+	} else {
+		ret = 1;
+	}
+
+bail:
+	return ret;
+}
+
+/*
+ * paranoid wrapper, runs hg executable in server mode.
+ */
+static void serve_data(int argc, char **argv)
+{
+	char *hg_root = HG_ROOT;
+	char *repo, *repo_root;
+	enum cmdline cmd;
+	char *nargv[6];
+	size_t repolen;
+	int i;
+
+	/*
+	 * check argv for looking okay. we should be invoked with argv
+	 * resembling like this:
+	 *
+	 *   hgsh
+	 *   -c
+	 *   hg -R some/path serve --stdio
+	 *
+	 * the "-c" is added by sshd, because it thinks we are login shell.
+	 */
+
+	if (argc != 3) {
+		goto badargs;
+	}
+
+	if (strcmp(argv[1], "-c") != 0) {
+		goto badargs;
+	}
+
+	if (sscanf(argv[2], "hg init %as", &repo) == 1) {
+		cmd = hg_init;
+	} else if (sscanf(argv[2], "hg -R %as serve --stdio", &repo) == 1) {
+		cmd = hg_serve;
+	} else {
+		goto badargs;
+	}
+
+	repolen = repo ? strlen(repo) : 0;
+
+	if (repolen == 0) {
+		goto badargs;
+	}
+
+	if (hg_root) {
+		if (asprintf(&repo_root, "%s/%s/", hg_root, repo) == -1) {
+			goto badargs;
+		}
+
+		/*
+		 * attempt to stop break out from inside the
+		 * repository tree. could do something more clever
+		 * here, because e.g. we could traverse a symlink that
+		 * looks safe, but really breaks us out of tree.
+		 */
+
+		if (strstr(repo_root, "/../") != NULL) {
+			goto badargs;
+		}
+
+		/* only hg init expects no repo. */
+
+		if (cmd != hg_init) {
+			int valid;
+
+			valid = validate_repo(repo_root, "data");
+
+			if (valid == -1) {
+				goto badargs;
+			}
+
+			if (valid == 0) {
+				valid = validate_repo(repo_root, "store");
+
+				if (valid == -1) {
+					goto badargs;
+				}
+			}
+
+			if (valid == 0) {
+				perror(repo);
+				exit(EX_DATAERR);
+			}
+		}
+
+		if (chdir(hg_root) == -1) {
+			perror(hg_root);
+			exit(EX_SOFTWARE);
+		}
+	}
+
+	i = 0;
+
+	switch (cmd) {
+	case hg_serve:
+		nargv[i++] = HG;
+		nargv[i++] = "-R";
+		nargv[i++] = repo;
+		nargv[i++] = "serve";
+		nargv[i++] = "--stdio";
+		break;
+	case hg_init:
+		nargv[i++] = HG;
+		nargv[i++] = "init";
+		nargv[i++] = repo;
+		break;
+	}
+
+	nargv[i] = NULL;
+
+	if (debug) {
+		print_cmdline(i, nargv);
+	}
+
+	execv(HG, nargv);
+	perror(HG);
+	exit(EX_UNAVAILABLE);
+
+badargs:
+	/* print useless error message. */
+
+	usage("invalid arguments", EX_DATAERR);
+}
+
+int main(int argc, char **argv)
+{
+	char host[1024];
+	char *c;
+
+	if (gethostname(host, sizeof(host)) == -1) {
+		perror("gethostname");
+		exit(EX_OSERR);
+	}
+
+	if ((c = strchr(host, '.')) != NULL) {
+		*c = '\0';
+	}
+
+	if (getenv("SSH_CLIENT")) {
+		char *hg_gateway = HG_GATEWAY;
+		char *hg_host = HG_HOST;
+
+		if (hg_gateway && strcmp(host, hg_gateway) == 0) {
+			forward_through_gateway(argc, argv);
+		}
+
+		if (hg_host && strcmp(host, hg_host) != 0) {
+			usage("invoked on unexpected host", EX_USAGE);
+		}
+
+		serve_data(argc, argv);
+	} else if (HG_SHELL) {
+		run_shell(argc, argv);
+	} else {
+		usage("invalid arguments", EX_DATAERR);
+	}
+
+	return 0;
+}

contrib/hgweb.fcgi

@@ -0,0 +1,19 b''
+#!/usr/bin/env python
+#
+# An example FastCGI script for use with flup, edit as necessary
+
+# Path to repo or hgweb config to serve (see 'hg help hgweb')
+config = "/path/to/repo/or/config"
+
+# Uncomment and adjust if Mercurial is not installed system-wide
+# (consult "installed modules" path from 'hg debuginstall'):
+#import sys; sys.path.insert(0, "/path/to/python/lib")
+
+# Uncomment to send python tracebacks to the browser if an error occurs:
+#import cgitb; cgitb.enable()
+
+from mercurial import demandimport; demandimport.enable()
+from mercurial.hgweb import hgweb
+from flup.server.fcgi import WSGIServer
+application = hgweb(config)
+WSGIServer(application).run()

contrib/hgweb.wsgi

@@ -0,0 +1,18 b''
+# An example WSGI for use with mod_wsgi, edit as necessary
+# See https://mercurial-scm.org/wiki/modwsgi for more information
+
+# Path to repo or hgweb config to serve (see 'hg help hgweb')
+config = "/path/to/repo/or/config"
+
+# Uncomment and adjust if Mercurial is not installed system-wide
+# (consult "installed modules" path from 'hg debuginstall'):
+#import sys; sys.path.insert(0, "/path/to/python/lib")
+
+# Uncomment to send python tracebacks to the browser if an error occurs:
+#import cgitb; cgitb.enable()
+
+# enable demandloading to reduce startup time
+from mercurial import demandimport; demandimport.enable()
+
+from mercurial.hgweb import hgweb
+application = hgweb(config)

contrib/import-checker.py

@@ -0,0 +1,781 b''
+#!/usr/bin/env python
+
+from __future__ import absolute_import, print_function
+
+import ast
+import collections
+import os
+import re
+import sys
+
+# Import a minimal set of stdlib modules needed for list_stdlib_modules()
+# to work when run from a virtualenv.  The modules were chosen empirically
+# so that the return value matches the return value without virtualenv.
+if True: # disable lexical sorting checks
+    try:
+        import BaseHTTPServer as basehttpserver
+    except ImportError:
+        basehttpserver = None
+    import zlib
+
+# Whitelist of modules that symbols can be directly imported from.
+allowsymbolimports = (
+    '__future__',
+    'bzrlib',
+    'hgclient',
+    'mercurial',
+    'mercurial.hgweb.common',
+    'mercurial.hgweb.request',
+    'mercurial.i18n',
+    'mercurial.node',
+    # for cffi modules to re-export pure functions
+    'mercurial.pure.base85',
+    'mercurial.pure.bdiff',
+    'mercurial.pure.mpatch',
+    'mercurial.pure.osutil',
+    'mercurial.pure.parsers',
+    # third-party imports should be directly imported
+    'mercurial.thirdparty',
+    'mercurial.thirdparty.cbor',
+    'mercurial.thirdparty.cbor.cbor2',
+    'mercurial.thirdparty.zope',
+    'mercurial.thirdparty.zope.interface',
+)
+
+# Whitelist of symbols that can be directly imported.
+directsymbols = (
+    'demandimport',
+)
+
+# Modules that must be aliased because they are commonly confused with
+# common variables and can create aliasing and readability issues.
+requirealias = {
+    'ui': 'uimod',
+}
+
+def usingabsolute(root):
+    """Whether absolute imports are being used."""
+    if sys.version_info[0] >= 3:
+        return True
+
+    for node in ast.walk(root):
+        if isinstance(node, ast.ImportFrom):
+            if node.module == '__future__':
+                for n in node.names:
+                    if n.name == 'absolute_import':
+                        return True
+
+    return False
+
+def walklocal(root):
+    """Recursively yield all descendant nodes but not in a different scope"""
+    todo = collections.deque(ast.iter_child_nodes(root))
+    yield root, False
+    while todo:
+        node = todo.popleft()
+        newscope = isinstance(node, ast.FunctionDef)
+        if not newscope:
+            todo.extend(ast.iter_child_nodes(node))
+        yield node, newscope
+
+def dotted_name_of_path(path):
+    """Given a relative path to a source file, return its dotted module name.
+
+    >>> dotted_name_of_path('mercurial/error.py')
+    'mercurial.error'
+    >>> dotted_name_of_path('zlibmodule.so')
+    'zlib'
+    """
+    parts = path.replace(os.sep, '/').split('/')
+    parts[-1] = parts[-1].split('.', 1)[0] # remove .py and .so and .ARCH.so
+    if parts[-1].endswith('module'):
+        parts[-1] = parts[-1][:-6]
+    return '.'.join(parts)
+
+def fromlocalfunc(modulename, localmods):
+    """Get a function to examine which locally defined module the
+    target source imports via a specified name.
+
+    `modulename` is an `dotted_name_of_path()`-ed source file path,
+    which may have `.__init__` at the end of it, of the target source.
+
+    `localmods` is a set of absolute `dotted_name_of_path()`-ed source file
+    paths of locally defined (= Mercurial specific) modules.
+
+    This function assumes that module names not existing in
+    `localmods` are from the Python standard library.
+
+    This function returns the function, which takes `name` argument,
+    and returns `(absname, dottedpath, hassubmod)` tuple if `name`
+    matches against locally defined module. Otherwise, it returns
+    False.
+
+    It is assumed that `name` doesn't have `.__init__`.
+
+    `absname` is an absolute module name of specified `name`
+    (e.g. "hgext.convert"). This can be used to compose prefix for sub
+    modules or so.
+
+    `dottedpath` is a `dotted_name_of_path()`-ed source file path
+    (e.g. "hgext.convert.__init__") of `name`. This is used to look
+    module up in `localmods` again.
+
+    `hassubmod` is whether it may have sub modules under it (for
+    convenient, even though this is also equivalent to "absname !=
+    dottednpath")
+
+    >>> localmods = {'foo.__init__', 'foo.foo1',
+    ...              'foo.bar.__init__', 'foo.bar.bar1',
+    ...              'baz.__init__', 'baz.baz1'}
+    >>> fromlocal = fromlocalfunc('foo.xxx', localmods)
+    >>> # relative
+    >>> fromlocal('foo1')
+    ('foo.foo1', 'foo.foo1', False)
+    >>> fromlocal('bar')
+    ('foo.bar', 'foo.bar.__init__', True)
+    >>> fromlocal('bar.bar1')
+    ('foo.bar.bar1', 'foo.bar.bar1', False)
+    >>> # absolute
+    >>> fromlocal('baz')
+    ('baz', 'baz.__init__', True)
+    >>> fromlocal('baz.baz1')
+    ('baz.baz1', 'baz.baz1', False)
+    >>> # unknown = maybe standard library
+    >>> fromlocal('os')
+    False
+    >>> fromlocal(None, 1)
+    ('foo', 'foo.__init__', True)
+    >>> fromlocal('foo1', 1)
+    ('foo.foo1', 'foo.foo1', False)
+    >>> fromlocal2 = fromlocalfunc('foo.xxx.yyy', localmods)
+    >>> fromlocal2(None, 2)
+    ('foo', 'foo.__init__', True)
+    >>> fromlocal2('bar2', 1)
+    False
+    >>> fromlocal2('bar', 2)
+    ('foo.bar', 'foo.bar.__init__', True)
+    """
+    if not isinstance(modulename, str):
+        modulename = modulename.decode('ascii')
+    prefix = '.'.join(modulename.split('.')[:-1])
+    if prefix:
+        prefix += '.'
+    def fromlocal(name, level=0):
+        # name is false value when relative imports are used.
+        if not name:
+            # If relative imports are used, level must not be absolute.
+            assert level > 0
+            candidates = ['.'.join(modulename.split('.')[:-level])]
+        else:
+            if not level:
+                # Check relative name first.
+                candidates = [prefix + name, name]
+            else:
+                candidates = ['.'.join(modulename.split('.')[:-level]) +
+                              '.' + name]
+
+        for n in candidates:
+            if n in localmods:
+                return (n, n, False)
+            dottedpath = n + '.__init__'
+            if dottedpath in localmods:
+                return (n, dottedpath, True)
+        return False
+    return fromlocal
+
+def populateextmods(localmods):
+    """Populate C extension modules based on pure modules"""
+    newlocalmods = set(localmods)
+    for n in localmods:
+        if n.startswith('mercurial.pure.'):
+            m = n[len('mercurial.pure.'):]
+            newlocalmods.add('mercurial.cext.' + m)
+            newlocalmods.add('mercurial.cffi._' + m)
+    return newlocalmods
+
+def list_stdlib_modules():
+    """List the modules present in the stdlib.
+
+    >>> py3 = sys.version_info[0] >= 3
+    >>> mods = set(list_stdlib_modules())
+    >>> 'BaseHTTPServer' in mods or py3
+    True
+
+    os.path isn't really a module, so it's missing:
+
+    >>> 'os.path' in mods
+    False
+
+    sys requires special treatment, because it's baked into the
+    interpreter, but it should still appear:
+
+    >>> 'sys' in mods
+    True
+
+    >>> 'collections' in mods
+    True
+
+    >>> 'cStringIO' in mods or py3
+    True
+
+    >>> 'cffi' in mods
+    True
+    """
+    for m in sys.builtin_module_names:
+        yield m
+    # These modules only exist on windows, but we should always
+    # consider them stdlib.
+    for m in ['msvcrt', '_winreg']:
+        yield m
+    yield '__builtin__'
+    yield 'builtins' # python3 only
+    yield 'importlib.abc' # python3 only
+    yield 'importlib.machinery' # python3 only
+    yield 'importlib.util' # python3 only
+    for m in 'fcntl', 'grp', 'pwd', 'termios':  # Unix only
+        yield m
+    for m in 'cPickle', 'datetime': # in Python (not C) on PyPy
+        yield m
+    for m in ['cffi']:
+        yield m
+    stdlib_prefixes = {sys.prefix, sys.exec_prefix}
+    # We need to supplement the list of prefixes for the search to work
+    # when run from within a virtualenv.
+    for mod in (basehttpserver, zlib):
+        if mod is None:
+            continue
+        try:
+            # Not all module objects have a __file__ attribute.
+            filename = mod.__file__
+        except AttributeError:
+            continue
+        dirname = os.path.dirname(filename)
+        for prefix in stdlib_prefixes:
+            if dirname.startswith(prefix):
+                # Then this directory is redundant.
+                break
+        else:
+            stdlib_prefixes.add(dirname)
+    for libpath in sys.path:
+        # We want to walk everything in sys.path that starts with
+        # something in stdlib_prefixes.
+        if not any(libpath.startswith(p) for p in stdlib_prefixes):
+            continue
+        for top, dirs, files in os.walk(libpath):
+            for i, d in reversed(list(enumerate(dirs))):
+                if (not os.path.exists(os.path.join(top, d, '__init__.py'))
+                    or top == libpath and d in ('hgdemandimport', 'hgext',
+                                                'mercurial')):
+                    del dirs[i]
+            for name in files:
+                if not name.endswith(('.py', '.so', '.pyc', '.pyo', '.pyd')):
+                    continue
+                if name.startswith('__init__.py'):
+                    full_path = top
+                else:
+                    full_path = os.path.join(top, name)
+                rel_path = full_path[len(libpath) + 1:]
+                mod = dotted_name_of_path(rel_path)
+                yield mod
+
+stdlib_modules = set(list_stdlib_modules())
+
+def imported_modules(source, modulename, f, localmods, ignore_nested=False):
+    """Given the source of a file as a string, yield the names
+    imported by that file.
+
+    Args:
+      source: The python source to examine as a string.
+      modulename: of specified python source (may have `__init__`)
+      localmods: set of locally defined module names (may have `__init__`)
+      ignore_nested: If true, import statements that do not start in
+                     column zero will be ignored.
+
+    Returns:
+      A list of absolute module names imported by the given source.
+
+    >>> f = 'foo/xxx.py'
+    >>> modulename = 'foo.xxx'
+    >>> localmods = {'foo.__init__': True,
+    ...              'foo.foo1': True, 'foo.foo2': True,
+    ...              'foo.bar.__init__': True, 'foo.bar.bar1': True,
+    ...              'baz.__init__': True, 'baz.baz1': True }
+    >>> # standard library (= not locally defined ones)
+    >>> sorted(imported_modules(
+    ...        'from stdlib1 import foo, bar; import stdlib2',
+    ...        modulename, f, localmods))
+    []
+    >>> # relative importing
+    >>> sorted(imported_modules(
+    ...        'import foo1; from bar import bar1',
+    ...        modulename, f, localmods))
+    ['foo.bar.bar1', 'foo.foo1']
+    >>> sorted(imported_modules(
+    ...        'from bar.bar1 import name1, name2, name3',
+    ...        modulename, f, localmods))
+    ['foo.bar.bar1']
+    >>> # absolute importing
+    >>> sorted(imported_modules(
+    ...        'from baz import baz1, name1',
+    ...        modulename, f, localmods))
+    ['baz.__init__', 'baz.baz1']
+    >>> # mixed importing, even though it shouldn't be recommended
+    >>> sorted(imported_modules(
+    ...        'import stdlib, foo1, baz',
+    ...        modulename, f, localmods))
+    ['baz.__init__', 'foo.foo1']
+    >>> # ignore_nested
+    >>> sorted(imported_modules(
+    ... '''import foo
+    ... def wat():
+    ...     import bar
+    ... ''', modulename, f, localmods))
+    ['foo.__init__', 'foo.bar.__init__']
+    >>> sorted(imported_modules(
+    ... '''import foo
+    ... def wat():
+    ...     import bar
+    ... ''', modulename, f, localmods, ignore_nested=True))
+    ['foo.__init__']
+    """
+    fromlocal = fromlocalfunc(modulename, localmods)
+    for node in ast.walk(ast.parse(source, f)):
+        if ignore_nested and getattr(node, 'col_offset', 0) > 0:
+            continue
+        if isinstance(node, ast.Import):
+            for n in node.names:
+                found = fromlocal(n.name)
+                if not found:
+                    # this should import standard library
+                    continue
+                yield found[1]
+        elif isinstance(node, ast.ImportFrom):
+            found = fromlocal(node.module, node.level)
+            if not found:
+                # this should import standard library
+                continue
+
+            absname, dottedpath, hassubmod = found
+            if not hassubmod:
+                # "dottedpath" is not a package; must be imported
+                yield dottedpath
+                # examination of "node.names" should be redundant
+                # e.g.: from mercurial.node import nullid, nullrev
+                continue
+
+            modnotfound = False
+            prefix = absname + '.'
+            for n in node.names:
+                found = fromlocal(prefix + n.name)
+                if not found:
+                    # this should be a function or a property of "node.module"
+                    modnotfound = True
+                    continue
+                yield found[1]
+            if modnotfound:
+                # "dottedpath" is a package, but imported because of non-module
+                # lookup
+                yield dottedpath
+
+def verify_import_convention(module, source, localmods):
+    """Verify imports match our established coding convention.
+
+    We have 2 conventions: legacy and modern. The modern convention is in
+    effect when using absolute imports.
+
+    The legacy convention only looks for mixed imports. The modern convention
+    is much more thorough.
+    """
+    root = ast.parse(source)
+    absolute = usingabsolute(root)
+
+    if absolute:
+        return verify_modern_convention(module, root, localmods)
+    else:
+        return verify_stdlib_on_own_line(root)
+
+def verify_modern_convention(module, root, localmods, root_col_offset=0):
+    """Verify a file conforms to the modern import convention rules.
+
+    The rules of the modern convention are:
+
+    * Ordering is stdlib followed by local imports. Each group is lexically
+      sorted.
+    * Importing multiple modules via "import X, Y" is not allowed: use
+      separate import statements.
+    * Importing multiple modules via "from X import ..." is allowed if using
+      parenthesis and one entry per line.
+    * Only 1 relative import statement per import level ("from .", "from ..")
+      is allowed.
+    * Relative imports from higher levels must occur before lower levels. e.g.
+      "from .." must be before "from .".
+    * Imports from peer packages should use relative import (e.g. do not
+      "import mercurial.foo" from a "mercurial.*" module).
+    * Symbols can only be imported from specific modules (see
+      `allowsymbolimports`). For other modules, first import the module then
+      assign the symbol to a module-level variable. In addition, these imports
+      must be performed before other local imports. This rule only
+      applies to import statements outside of any blocks.
+    * Relative imports from the standard library are not allowed, unless that
+      library is also a local module.
+    * Certain modules must be aliased to alternate names to avoid aliasing
+      and readability problems. See `requirealias`.
+    """
+    if not isinstance(module, str):
+        module = module.decode('ascii')
+    topmodule = module.split('.')[0]
+    fromlocal = fromlocalfunc(module, localmods)
+
+    # Whether a local/non-stdlib import has been performed.
+    seenlocal = None
+    # Whether a local/non-stdlib, non-symbol import has been seen.
+    seennonsymbollocal = False
+    # The last name to be imported (for sorting).
+    lastname = None
+    laststdlib = None
+    # Relative import levels encountered so far.
+    seenlevels = set()
+
+    for node, newscope in walklocal(root):
+        def msg(fmt, *args):
+            return (fmt % args, node.lineno)
+        if newscope:
+            # Check for local imports in function
+            for r in verify_modern_convention(module, node, localmods,
+                                              node.col_offset + 4):
+                yield r
+        elif isinstance(node, ast.Import):
+            # Disallow "import foo, bar" and require separate imports
+            # for each module.
+            if len(node.names) > 1:
+                yield msg('multiple imported names: %s',
+                          ', '.join(n.name for n in node.names))
+
+            name = node.names[0].name
+            asname = node.names[0].asname
+
+            stdlib = name in stdlib_modules
+
+            # Ignore sorting rules on imports inside blocks.
+            if node.col_offset == root_col_offset:
+                if lastname and name < lastname and laststdlib == stdlib:
+                    yield msg('imports not lexically sorted: %s < %s',
+                              name, lastname)
+
+            lastname = name
+            laststdlib = stdlib
+
+            # stdlib imports should be before local imports.
+            if stdlib and seenlocal and node.col_offset == root_col_offset:
+                yield msg('stdlib import "%s" follows local import: %s',
+                          name, seenlocal)
+
+            if not stdlib:
+                seenlocal = name
+
+            # Import of sibling modules should use relative imports.
+            topname = name.split('.')[0]
+            if topname == topmodule:
+                yield msg('import should be relative: %s', name)
+
+            if name in requirealias and asname != requirealias[name]:
+                yield msg('%s module must be "as" aliased to %s',
+                          name, requirealias[name])
+
+        elif isinstance(node, ast.ImportFrom):
+            # Resolve the full imported module name.
+            if node.level > 0:
+                fullname = '.'.join(module.split('.')[:-node.level])
+                if node.module:
+                    fullname += '.%s' % node.module
+            else:
+                assert node.module
+                fullname = node.module
+
+                topname = fullname.split('.')[0]
+                if topname == topmodule:
+                    yield msg('import should be relative: %s', fullname)
+
+            # __future__ is special since it needs to come first and use
+            # symbol import.
+            if fullname != '__future__':
+                if not fullname or (
+                    fullname in stdlib_modules
+                    and fullname not in localmods
+                    and fullname + '.__init__' not in localmods):
+                    yield msg('relative import of stdlib module')
+                else:
+                    seenlocal = fullname
+
+            # Direct symbol import is only allowed from certain modules and
+            # must occur before non-symbol imports.
+            found = fromlocal(node.module, node.level)
+            if found and found[2]:  # node.module is a package
+                prefix = found[0] + '.'
+                symbols = (n.name for n in node.names
+                           if not fromlocal(prefix + n.name))
+            else:
+                symbols = (n.name for n in node.names)
+            symbols = [sym for sym in symbols if sym not in directsymbols]
+            if node.module and node.col_offset == root_col_offset:
+                if symbols and fullname not in allowsymbolimports:
+                    yield msg('direct symbol import %s from %s',
+                              ', '.join(symbols), fullname)
+
+                if symbols and seennonsymbollocal:
+                    yield msg('symbol import follows non-symbol import: %s',
+                              fullname)
+            if not symbols and fullname not in stdlib_modules:
+                seennonsymbollocal = True
+
+            if not node.module:
+                assert node.level
+
+                # Only allow 1 group per level.
+                if (node.level in seenlevels
+                    and node.col_offset == root_col_offset):
+                    yield msg('multiple "from %s import" statements',
+                              '.' * node.level)
+
+                # Higher-level groups come before lower-level groups.
+                if any(node.level > l for l in seenlevels):
+                    yield msg('higher-level import should come first: %s',
+                              fullname)
+
+                seenlevels.add(node.level)
+
+            # Entries in "from .X import ( ... )" lists must be lexically
+            # sorted.
+            lastentryname = None
+
+            for n in node.names:
+                if lastentryname and n.name < lastentryname:
+                    yield msg('imports from %s not lexically sorted: %s < %s',
+                              fullname, n.name, lastentryname)
+
+                lastentryname = n.name
+
+                if n.name in requirealias and n.asname != requirealias[n.name]:
+                    yield msg('%s from %s must be "as" aliased to %s',
+                              n.name, fullname, requirealias[n.name])
+
+def verify_stdlib_on_own_line(root):
+    """Given some python source, verify that stdlib imports are done
+    in separate statements from relative local module imports.
+
+    >>> list(verify_stdlib_on_own_line(ast.parse('import sys, foo')))
+    [('mixed imports\\n   stdlib:    sys\\n   relative:  foo', 1)]
+    >>> list(verify_stdlib_on_own_line(ast.parse('import sys, os')))
+    []
+    >>> list(verify_stdlib_on_own_line(ast.parse('import foo, bar')))
+    []
+    """
+    for node in ast.walk(root):
+        if isinstance(node, ast.Import):
+            from_stdlib = {False: [], True: []}
+            for n in node.names:
+                from_stdlib[n.name in stdlib_modules].append(n.name)
+            if from_stdlib[True] and from_stdlib[False]:
+                yield ('mixed imports\n   stdlib:    %s\n   relative:  %s' %
+                       (', '.join(sorted(from_stdlib[True])),
+                        ', '.join(sorted(from_stdlib[False]))), node.lineno)
+
+class CircularImport(Exception):
+    pass
+
+def checkmod(mod, imports):
+    shortest = {}
+    visit = [[mod]]
+    while visit:
+        path = visit.pop(0)
+        for i in sorted(imports.get(path[-1], [])):
+            if len(path) < shortest.get(i, 1000):
+                shortest[i] = len(path)
+                if i in path:
+                    if i == path[0]:
+                        raise CircularImport(path)
+                    continue
+                visit.append(path + [i])
+
+def rotatecycle(cycle):
+    """arrange a cycle so that the lexicographically first module listed first
+
+    >>> rotatecycle(['foo', 'bar'])
+    ['bar', 'foo', 'bar']
+    """
+    lowest = min(cycle)
+    idx = cycle.index(lowest)
+    return cycle[idx:] + cycle[:idx] + [lowest]
+
+def find_cycles(imports):
+    """Find cycles in an already-loaded import graph.
+
+    All module names recorded in `imports` should be absolute one.
+
+    >>> from __future__ import print_function
+    >>> imports = {'top.foo': ['top.bar', 'os.path', 'top.qux'],
+    ...            'top.bar': ['top.baz', 'sys'],
+    ...            'top.baz': ['top.foo'],
+    ...            'top.qux': ['top.foo']}
+    >>> print('\\n'.join(sorted(find_cycles(imports))))
+    top.bar -> top.baz -> top.foo -> top.bar
+    top.foo -> top.qux -> top.foo
+    """
+    cycles = set()
+    for mod in sorted(imports.keys()):
+        try:
+            checkmod(mod, imports)
+        except CircularImport as e:
+            cycle = e.args[0]
+            cycles.add(" -> ".join(rotatecycle(cycle)))
+    return cycles
+
+def _cycle_sortkey(c):
+    return len(c), c
+
+def embedded(f, modname, src):
+    """Extract embedded python code
+
+    >>> def _forcestr(thing):
+    ...     if not isinstance(thing, str):
+    ...         return thing.decode('ascii')
+    ...     return thing
+    >>> def test(fn, lines):
+    ...     for s, m, f, l in embedded(fn, b"example", lines):
+    ...         print("%s %s %d" % (_forcestr(m), _forcestr(f), l))
+    ...         print(repr(_forcestr(s)))
+    >>> lines = [
+    ...   b'comment',
+    ...   b'  >>> from __future__ import print_function',
+    ...   b"  >>> ' multiline",
+    ...   b"  ... string'",
+    ...   b'  ',
+    ...   b'comment',
+    ...   b'  $ cat > foo.py <<EOF',
+    ...   b'  > from __future__ import print_function',
+    ...   b'  > EOF',
+    ... ]
+    >>> test(b"example.t", lines)
+    example[2] doctest.py 2
+    "from __future__ import print_function\\n' multiline\\nstring'\\n"
+    example[7] foo.py 7
+    'from __future__ import print_function\\n'
+    """
+    inlinepython = 0
+    shpython = 0
+    script = []
+    prefix = 6
+    t = ''
+    n = 0
+    for l in src:
+        n += 1
+        if not l.endswith(b'\n'):
+            l += b'\n'
+        if l.startswith(b'  >>> '): # python inlines
+            if shpython:
+                print("%s:%d: Parse Error" % (f, n))
+            if not inlinepython:
+                # We've just entered a Python block.
+                inlinepython = n
+                t = b'doctest.py'
+            script.append(l[prefix:])
+            continue
+        if l.startswith(b'  ... '): # python inlines
+            script.append(l[prefix:])
+            continue
+        cat = re.search(br"\$ \s*cat\s*>\s*(\S+\.py)\s*<<\s*EOF", l)
+        if cat:
+            if inlinepython:
+                yield b''.join(script), (b"%s[%d]" %
+                       (modname, inlinepython)), t, inlinepython
+                script = []
+                inlinepython = 0
+            shpython = n
+            t = cat.group(1)
+            continue
+        if shpython and l.startswith(b'  > '): # sh continuation
+            if l == b'  > EOF\n':
+                yield b''.join(script), (b"%s[%d]" %
+                       (modname, shpython)), t, shpython
+                script = []
+                shpython = 0
+            else:
+                script.append(l[4:])
+            continue
+        # If we have an empty line or a command for sh, we end the
+        # inline script.
+        if inlinepython and (l == b'  \n'
+                             or l.startswith(b'  $ ')):
+            yield b''.join(script), (b"%s[%d]" %
+                   (modname, inlinepython)), t, inlinepython
+            script = []
+            inlinepython = 0
+            continue
+
+def sources(f, modname):
+    """Yields possibly multiple sources from a filepath
+
+    input: filepath, modulename
+    yields:  script(string), modulename, filepath, linenumber
+
+    For embedded scripts, the modulename and filepath will be different
+    from the function arguments. linenumber is an offset relative to
+    the input file.
+    """
+    py = False
+    if not f.endswith('.t'):
+        with open(f, 'rb') as src:
+            yield src.read(), modname, f, 0
+            py = True
+    if py or f.endswith('.t'):
+        with open(f, 'rb') as src:
+            for script, modname, t, line in embedded(f, modname, src):
+                yield script, modname, t, line
+
+def main(argv):
+    if len(argv) < 2 or (argv[1] == '-' and len(argv) > 2):
+        print('Usage: %s {-|file [file] [file] ...}')
+        return 1
+    if argv[1] == '-':
+        argv = argv[:1]
+        argv.extend(l.rstrip() for l in sys.stdin.readlines())
+    localmodpaths = {}
+    used_imports = {}
+    any_errors = False
+    for source_path in argv[1:]:
+        modname = dotted_name_of_path(source_path)
+        localmodpaths[modname] = source_path
+    localmods = populateextmods(localmodpaths)
+    for localmodname, source_path in sorted(localmodpaths.items()):
+        if not isinstance(localmodname, bytes):
+            # This is only safe because all hg's files are ascii
+            localmodname = localmodname.encode('ascii')
+        for src, modname, name, line in sources(source_path, localmodname):
+            try:
+                used_imports[modname] = sorted(
+                    imported_modules(src, modname, name, localmods,
+                                     ignore_nested=True))
+                for error, lineno in verify_import_convention(modname, src,
+                                                              localmods):
+                    any_errors = True
+                    print('%s:%d: %s' % (source_path, lineno + line, error))
+            except SyntaxError as e:
+                print('%s:%d: SyntaxError: %s' %
+                      (source_path, e.lineno + line, e))
+    cycles = find_cycles(used_imports)
+    if cycles:
+        firstmods = set()
+        for c in sorted(cycles, key=_cycle_sortkey):
+            first = c.split()[0]
+            # As a rough cut, ignore any cycle that starts with the
+            # same module as some other cycle. Otherwise we see lots
+            # of cycles that are effectively duplicates.
+            if first in firstmods:
+                continue
+            print('Import cycle:', c)
+            firstmods.add(first)
+        any_errors = True
+    return any_errors != 0
+
+if __name__ == '__main__':
+    sys.exit(int(main(sys.argv)))

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+</svg>

contrib/memory.py

@@ -0,0 +1,31 b''
+# memory.py - track memory usage
+#
+# Copyright 2009 Matt Mackall <[e-mail]> and others
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+'''helper extension to measure memory usage
+
+Reads current and peak memory usage from ``/proc/self/status`` and
+prints it to ``stderr`` on exit.
+'''
+
+from __future__ import absolute_import
+
+def memusage(ui):
+    """Report memory usage of the current process."""
+    result = {'peak': 0, 'rss': 0}
+    with open('/proc/self/status', 'r') as status:
+        # This will only work on systems with a /proc file system
+        # (like Linux).
+        for line in status:
+            parts = line.split()
+            key = parts[0][2:-1].lower()
+            if key in result:
+                result[key] = int(parts[1])
+    ui.write_err(", ".join(["%s: %.1f MiB" % (k, v / 1024.0)
+                            for k, v in result.iteritems()]) + "\n")
+
+def extsetup(ui):
+    ui.atexit(memusage, ui)