extdiff: document that it copies modified files back to working directory

Differential Revision: https://phab.mercurial-scm.org/D2976

hgext/extdiff.py

@@ -1,422 +1,427 b''
 # extdiff.py - external diff program support 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 version 2 or any later version.
 
 '''command to allow external programs to compare revisions
 
 The extdiff Mercurial extension allows you to use external programs
 to compare revisions, or revision with working directory. The external
 diff programs are called with a configurable set of options and two
 non-option arguments: paths to directories containing snapshots of
 files to compare.
 
+If there is more than one file being compared and the "child" revision
+is the working directory, any modifications made in the external diff
+program will be copied back to the working directory from the temporary
+directory.
+
 The extdiff extension also allows you to configure new diff commands, so
 you do not need to type :hg:`extdiff -p kdiff3` always. ::
 
   [extdiff]
   # add new command that runs GNU diff(1) in 'context diff' mode
   cdiff = gdiff -Nprc5
   ## or the old way:
   #cmd.cdiff = gdiff
   #opts.cdiff = -Nprc5
 
   # add new command called meld, runs meld (no need to name twice).  If
   # the meld executable is not available, the meld tool in [merge-tools]
   # will be used, if available
   meld =
 
   # add new command called vimdiff, runs gvimdiff with DirDiff plugin
   # (see http://www.vim.org/scripts/script.php?script_id=102) Non
   # English user, be sure to put "let g:DirDiffDynamicDiffText = 1" in
   # your .vimrc
   vimdiff = gvim -f "+next" \\
             "+execute 'DirDiff' fnameescape(argv(0)) fnameescape(argv(1))"
 
 Tool arguments can include variables that are expanded at runtime::
 
   $parent1, $plabel1 - filename, descriptive label of first parent
   $child,   $clabel  - filename, descriptive label of child revision
   $parent2, $plabel2 - filename, descriptive label of second parent
   $root              - repository root
   $parent is an alias for $parent1.
 
 The extdiff extension will look in your [diff-tools] and [merge-tools]
 sections for diff tool arguments, when none are specified in [extdiff].
 
 ::
 
   [extdiff]
   kdiff3 =
 
   [diff-tools]
   kdiff3.diffargs=--L1 '$plabel1' --L2 '$clabel' $parent $child
 
 You can use -I/-X and list of file or directory names like normal
 :hg:`diff` command. The extdiff extension makes snapshots of only
 needed files, so running the external diff program will actually be
 pretty fast (at least faster than having to compare the entire tree).
 '''
 
 from __future__ import absolute_import
 
 import os
 import re
 import shutil
 import stat
 import tempfile
 from mercurial.i18n import _
 from mercurial.node import (
     nullid,
     short,
 )
 from mercurial import (
     archival,
     cmdutil,
     error,
     filemerge,
     pycompat,
     registrar,
     scmutil,
     util,
 )
 from mercurial.utils import (
     procutil,
     stringutil,
 )
 
 cmdtable = {}
 command = registrar.command(cmdtable)
 
 configtable = {}
 configitem = registrar.configitem(configtable)
 
 configitem('extdiff', br'opts\..*',
     default='',
     generic=True,
 )
 
 configitem('diff-tools', br'.*\.diffargs$',
     default=None,
     generic=True,
 )
 
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
 testedwith = 'ships-with-hg-core'
 
 def snapshot(ui, repo, files, node, tmproot, listsubrepos):
     '''snapshot files as of some revision
     if not using snapshot, -I/-X does not work and recursive diff
     in tools like kdiff3 and meld displays too many files.'''
     dirname = os.path.basename(repo.root)
     if dirname == "":
         dirname = "root"
     if node is not None:
         dirname = '%s.%s' % (dirname, short(node))
     base = os.path.join(tmproot, dirname)
     os.mkdir(base)
     fnsandstat = []
 
     if node is not None:
         ui.note(_('making snapshot of %d files from rev %s\n') %
                 (len(files), short(node)))
     else:
         ui.note(_('making snapshot of %d files from working directory\n') %
             (len(files)))
 
     if files:
         repo.ui.setconfig("ui", "archivemeta", False)
 
         archival.archive(repo, base, node, 'files',
                          matchfn=scmutil.matchfiles(repo, files),
                          subrepos=listsubrepos)
 
         for fn in sorted(files):
             wfn = util.pconvert(fn)
             ui.note('  %s\n' % wfn)
 
             if node is None:
                 dest = os.path.join(base, wfn)
 
                 fnsandstat.append((dest, repo.wjoin(fn), os.lstat(dest)))
     return dirname, fnsandstat
 
 def dodiff(ui, repo, cmdline, pats, opts):
     '''Do the actual diff:
 
     - copy to a temp structure if diffing 2 internal revisions
     - copy to a temp structure if diffing working revision with
       another one and more than 1 file is changed
     - just invoke the diff for a single file in the working dir
     '''
 
     revs = opts.get('rev')
     change = opts.get('change')
     do3way = '$parent2' in cmdline
 
     if revs and change:
         msg = _('cannot specify --rev and --change at the same time')
         raise error.Abort(msg)
     elif change:
         node2 = scmutil.revsingle(repo, change, None).node()
         node1a, node1b = repo.changelog.parents(node2)
     else:
         node1a, node2 = scmutil.revpair(repo, revs)
         if not revs:
             node1b = repo.dirstate.p2()
         else:
             node1b = nullid
 
     # Disable 3-way merge if there is only one parent
     if do3way:
         if node1b == nullid:
             do3way = False
 
     subrepos=opts.get('subrepos')
 
     matcher = scmutil.match(repo[node2], pats, opts)
 
     if opts.get('patch'):
         if subrepos:
             raise error.Abort(_('--patch cannot be used with --subrepos'))
         if node2 is None:
             raise error.Abort(_('--patch requires two revisions'))
     else:
         mod_a, add_a, rem_a = map(set, repo.status(node1a, node2, matcher,
                                                    listsubrepos=subrepos)[:3])
         if do3way:
             mod_b, add_b, rem_b = map(set,
                                       repo.status(node1b, node2, matcher,
                                                   listsubrepos=subrepos)[:3])
         else:
             mod_b, add_b, rem_b = set(), set(), set()
         modadd = mod_a | add_a | mod_b | add_b
         common = modadd | rem_a | rem_b
         if not common:
             return 0
 
     tmproot = tempfile.mkdtemp(prefix='extdiff.')
     try:
         if not opts.get('patch'):
             # Always make a copy of node1a (and node1b, if applicable)
             dir1a_files = mod_a | rem_a | ((mod_b | add_b) - add_a)
             dir1a = snapshot(ui, repo, dir1a_files, node1a, tmproot,
                              subrepos)[0]
             rev1a = '@%d' % repo[node1a].rev()
             if do3way:
                 dir1b_files = mod_b | rem_b | ((mod_a | add_a) - add_b)
                 dir1b = snapshot(ui, repo, dir1b_files, node1b, tmproot,
                                  subrepos)[0]
                 rev1b = '@%d' % repo[node1b].rev()
             else:
                 dir1b = None
                 rev1b = ''
 
             fnsandstat = []
 
             # If node2 in not the wc or there is >1 change, copy it
             dir2root = ''
             rev2 = ''
             if node2:
                 dir2 = snapshot(ui, repo, modadd, node2, tmproot, subrepos)[0]
                 rev2 = '@%d' % repo[node2].rev()
             elif len(common) > 1:
                 #we only actually need to get the files to copy back to
                 #the working dir in this case (because the other cases
                 #are: diffing 2 revisions or single file -- in which case
                 #the file is already directly passed to the diff tool).
                 dir2, fnsandstat = snapshot(ui, repo, modadd, None, tmproot,
                                             subrepos)
             else:
                 # This lets the diff tool open the changed file directly
                 dir2 = ''
                 dir2root = repo.root
 
             label1a = rev1a
             label1b = rev1b
             label2 = rev2
 
             # If only one change, diff the files instead of the directories
             # Handle bogus modifies correctly by checking if the files exist
             if len(common) == 1:
                 common_file = util.localpath(common.pop())
                 dir1a = os.path.join(tmproot, dir1a, common_file)
                 label1a = common_file + rev1a
                 if not os.path.isfile(dir1a):
                     dir1a = os.devnull
                 if do3way:
                     dir1b = os.path.join(tmproot, dir1b, common_file)
                     label1b = common_file + rev1b
                     if not os.path.isfile(dir1b):
                         dir1b = os.devnull
                 dir2 = os.path.join(dir2root, dir2, common_file)
                 label2 = common_file + rev2
         else:
             template = 'hg-%h.patch'
             cmdutil.export(repo, [repo[node1a].rev(), repo[node2].rev()],
                            fntemplate=repo.vfs.reljoin(tmproot, template),
                            match=matcher)
             label1a = cmdutil.makefilename(repo[node1a], template)
             label2 = cmdutil.makefilename(repo[node2], template)
             dir1a = repo.vfs.reljoin(tmproot, label1a)
             dir2 = repo.vfs.reljoin(tmproot, label2)
             dir1b = None
             label1b = None
             fnsandstat = []
 
         # Function to quote file/dir names in the argument string.
         # When not operating in 3-way mode, an empty string is
         # returned for parent2
         replace = {'parent': dir1a, 'parent1': dir1a, 'parent2': dir1b,
                    'plabel1': label1a, 'plabel2': label1b,
                    'clabel': label2, 'child': dir2,
                    'root': repo.root}
         def quote(match):
             pre = match.group(2)
             key = match.group(3)
             if not do3way and key == 'parent2':
                 return pre
             return pre + procutil.shellquote(replace[key])
 
         # Match parent2 first, so 'parent1?' will match both parent1 and parent
         regex = (br'''(['"]?)([^\s'"$]*)'''
                  br'\$(parent2|parent1?|child|plabel1|plabel2|clabel|root)\1')
         if not do3way and not re.search(regex, cmdline):
             cmdline += ' $parent1 $child'
         cmdline = re.sub(regex, quote, cmdline)
 
         ui.debug('running %r in %s\n' % (pycompat.bytestr(cmdline), tmproot))
         ui.system(cmdline, cwd=tmproot, blockedtag='extdiff')
 
         for copy_fn, working_fn, st in fnsandstat:
             cpstat = os.lstat(copy_fn)
             # Some tools copy the file and attributes, so mtime may not detect
             # all changes.  A size check will detect more cases, but not all.
             # The only certain way to detect every case is to diff all files,
             # which could be expensive.
             # copyfile() carries over the permission, so the mode check could
             # be in an 'elif' branch, but for the case where the file has
             # changed without affecting mtime or size.
             if (cpstat[stat.ST_MTIME] != st[stat.ST_MTIME]
                 or cpstat.st_size != st.st_size
                 or (cpstat.st_mode & 0o100) != (st.st_mode & 0o100)):
                 ui.debug('file changed while diffing. '
                          'Overwriting: %s (src: %s)\n' % (working_fn, copy_fn))
                 util.copyfile(copy_fn, working_fn)
 
         return 1
     finally:
         ui.note(_('cleaning up temp directory\n'))
         shutil.rmtree(tmproot)
 
 extdiffopts = [
     ('o', 'option', [],
      _('pass option to comparison program'), _('OPT')),
     ('r', 'rev', [], _('revision'), _('REV')),
     ('c', 'change', '', _('change made by revision'), _('REV')),
     ('', 'patch', None, _('compare patches for two revisions'))
     ] + cmdutil.walkopts + cmdutil.subrepoopts
 
 @command('extdiff',
     [('p', 'program', '', _('comparison program to run'), _('CMD')),
      ] + extdiffopts,
     _('hg extdiff [OPT]... [FILE]...'),
     inferrepo=True)
 def extdiff(ui, repo, *pats, **opts):
     '''use external program to diff repository (or selected files)
 
     Show differences between revisions for the specified files, using
     an external program. The default program used is diff, with
     default options "-Npru".
 
     To select a different program, use the -p/--program option. The
     program will be passed the names of two directories to compare. To
     pass additional options to the program, use -o/--option. These
     will be passed before the names of the directories to compare.
 
     When two revision arguments are given, then changes are shown
     between those revisions. If only one revision is specified then
     that revision is compared to the working directory, and, when no
     revisions are specified, the working directory files are compared
     to its parent.'''
     opts = pycompat.byteskwargs(opts)
     program = opts.get('program')
     option = opts.get('option')
     if not program:
         program = 'diff'
         option = option or ['-Npru']
     cmdline = ' '.join(map(procutil.shellquote, [program] + option))
     return dodiff(ui, repo, cmdline, pats, opts)
 
 class savedcmd(object):
     """use external program to diff repository (or selected files)
 
     Show differences between revisions for the specified files, using
     the following program::
 
         %(path)s
 
     When two revision arguments are given, then changes are shown
     between those revisions. If only one revision is specified then
     that revision is compared to the working directory, and, when no
     revisions are specified, the working directory files are compared
     to its parent.
     """
 
     def __init__(self, path, cmdline):
         # We can't pass non-ASCII through docstrings (and path is
         # in an unknown encoding anyway)
         docpath = stringutil.escapestr(path)
         self.__doc__ %= {r'path': pycompat.sysstr(stringutil.uirepr(docpath))}
         self._cmdline = cmdline
 
     def __call__(self, ui, repo, *pats, **opts):
         opts = pycompat.byteskwargs(opts)
         options = ' '.join(map(procutil.shellquote, opts['option']))
         if options:
             options = ' ' + options
         return dodiff(ui, repo, self._cmdline + options, pats, opts)
 
 def uisetup(ui):
     for cmd, path in ui.configitems('extdiff'):
         path = util.expandpath(path)
         if cmd.startswith('cmd.'):
             cmd = cmd[4:]
             if not path:
                 path = procutil.findexe(cmd)
                 if path is None:
                     path = filemerge.findexternaltool(ui, cmd) or cmd
             diffopts = ui.config('extdiff', 'opts.' + cmd)
             cmdline = procutil.shellquote(path)
             if diffopts:
                 cmdline += ' ' + diffopts
         elif cmd.startswith('opts.'):
             continue
         else:
             if path:
                 # case "cmd = path opts"
                 cmdline = path
                 diffopts = len(pycompat.shlexsplit(cmdline)) > 1
             else:
                 # case "cmd ="
                 path = procutil.findexe(cmd)
                 if path is None:
                     path = filemerge.findexternaltool(ui, cmd) or cmd
                 cmdline = procutil.shellquote(path)
                 diffopts = False
         # look for diff arguments in [diff-tools] then [merge-tools]
         if not diffopts:
             args = ui.config('diff-tools', cmd+'.diffargs') or \
                    ui.config('merge-tools', cmd+'.diffargs')
             if args:
                 cmdline += ' ' + args
         command(cmd, extdiffopts[:], _('hg %s [OPTION]... [FILE]...') % cmd,
                 inferrepo=True)(savedcmd(path, cmdline))
 
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = [savedcmd]

tests/test-extension.t

@@ -1,1714 +1,1718 b''
 Test basic extension support
 
   $ cat > foobar.py <<EOF
   > import os
   > from mercurial import commands, registrar
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > configtable = {}
   > configitem = registrar.configitem(configtable)
   > configitem(b'tests', b'foo', default=b"Foo")
   > def uisetup(ui):
   >     ui.write(b"uisetup called\\n")
   >     ui.flush()
   > def reposetup(ui, repo):
   >     ui.write(b"reposetup called for %s\\n" % os.path.basename(repo.root))
   >     ui.write(b"ui %s= repo.ui\\n" % (ui == repo.ui and b"=" or b"!"))
   >     ui.flush()
   > @command(b'foo', [], b'hg foo')
   > def foo(ui, *args, **kwargs):
   >     foo = ui.config(b'tests', b'foo')
   >     ui.write(foo)
   >     ui.write(b"\\n")
   > @command(b'bar', [], b'hg bar', norepo=True)
   > def bar(ui, *args, **kwargs):
   >     ui.write(b"Bar\\n")
   > EOF
   $ abspath=`pwd`/foobar.py
 
   $ mkdir barfoo
   $ cp foobar.py barfoo/__init__.py
   $ barfoopath=`pwd`/barfoo
 
   $ hg init a
   $ cd a
   $ echo foo > file
   $ hg add file
   $ hg commit -m 'add file'
 
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "foobar = $abspath" >> $HGRCPATH
   $ hg foo
   uisetup called
   reposetup called for a
   ui == repo.ui
   reposetup called for a (chg !)
   ui == repo.ui (chg !)
   Foo
 
   $ cd ..
   $ hg clone a b
   uisetup called (no-chg !)
   reposetup called for a
   ui == repo.ui
   reposetup called for b
   ui == repo.ui
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
   $ hg bar
   uisetup called (no-chg !)
   Bar
   $ echo 'foobar = !' >> $HGRCPATH
 
 module/__init__.py-style
 
   $ echo "barfoo = $barfoopath" >> $HGRCPATH
   $ cd a
   $ hg foo
   uisetup called
   reposetup called for a
   ui == repo.ui
   reposetup called for a (chg !)
   ui == repo.ui (chg !)
   Foo
   $ echo 'barfoo = !' >> $HGRCPATH
 
 Check that extensions are loaded in phases:
 
   $ cat > foo.py <<EOF
   > import os
   > name = os.path.basename(__file__).rsplit('.', 1)[0]
   > print("1) %s imported" % name)
   > def uisetup(ui):
   >     print("2) %s uisetup" % name)
   > def extsetup():
   >     print("3) %s extsetup" % name)
   > def reposetup(ui, repo):
   >    print("4) %s reposetup" % name)
   > 
   > # custom predicate to check registration of functions at loading
   > from mercurial import (
   >     registrar,
   >     smartset,
   > )
   > revsetpredicate = registrar.revsetpredicate()
   > @revsetpredicate(name, safe=True) # safe=True for query via hgweb
   > def custompredicate(repo, subset, x):
   >     return smartset.baseset([r for r in subset if r in {0}])
   > EOF
 
   $ cp foo.py bar.py
   $ echo 'foo = foo.py' >> $HGRCPATH
   $ echo 'bar = bar.py' >> $HGRCPATH
 
 Check normal command's load order of extensions and registration of functions
 
   $ hg log -r "foo() and bar()" -q
   1) foo imported
   1) bar imported
   2) foo uisetup
   2) bar uisetup
   3) foo extsetup
   3) bar extsetup
   4) foo reposetup
   4) bar reposetup
   0:c24b9ac61126
 
 Check hgweb's load order of extensions and registration of functions
 
   $ cat > hgweb.cgi <<EOF
   > #!$PYTHON
   > from mercurial import demandimport; demandimport.enable()
   > from mercurial.hgweb import hgweb
   > from mercurial.hgweb import wsgicgi
   > application = hgweb('.', 'test repo')
   > wsgicgi.launch(application)
   > EOF
   $ . "$TESTDIR/cgienv"
 
   $ PATH_INFO='/' SCRIPT_NAME='' $PYTHON hgweb.cgi \
   >    | grep '^[0-9]) ' # ignores HTML output
   1) foo imported
   1) bar imported
   2) foo uisetup
   2) bar uisetup
   3) foo extsetup
   3) bar extsetup
   4) foo reposetup
   4) bar reposetup
 
 (check that revset predicate foo() and bar() are available)
 
 #if msys
   $ PATH_INFO='//shortlog'
 #else
   $ PATH_INFO='/shortlog'
 #endif
   $ export PATH_INFO
   $ SCRIPT_NAME='' QUERY_STRING='rev=foo() and bar()' $PYTHON hgweb.cgi \
   >     | grep '<a href="/rev/[0-9a-z]*">'
      <a href="/rev/c24b9ac61126">add file</a>
 
   $ echo 'foo = !' >> $HGRCPATH
   $ echo 'bar = !' >> $HGRCPATH
 
 Check "from __future__ import absolute_import" support for external libraries
 
 #if windows
   $ PATHSEP=";"
 #else
   $ PATHSEP=":"
 #endif
   $ export PATHSEP
 
   $ mkdir $TESTTMP/libroot
   $ echo "s = 'libroot/ambig.py'" > $TESTTMP/libroot/ambig.py
   $ mkdir $TESTTMP/libroot/mod
   $ touch $TESTTMP/libroot/mod/__init__.py
   $ echo "s = 'libroot/mod/ambig.py'" > $TESTTMP/libroot/mod/ambig.py
 
   $ cat > $TESTTMP/libroot/mod/ambigabs.py <<EOF
   > from __future__ import absolute_import
   > import ambig # should load "libroot/ambig.py"
   > s = ambig.s
   > EOF
   $ cat > loadabs.py <<EOF
   > import mod.ambigabs as ambigabs
   > def extsetup():
   >     print('ambigabs.s=%s' % ambigabs.s)
   > EOF
   $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}/libroot; hg --config extensions.loadabs=loadabs.py root)
   ambigabs.s=libroot/ambig.py
   $TESTTMP/a
 
 #if no-py3k
   $ cat > $TESTTMP/libroot/mod/ambigrel.py <<EOF
   > import ambig # should load "libroot/mod/ambig.py"
   > s = ambig.s
   > EOF
   $ cat > loadrel.py <<EOF
   > import mod.ambigrel as ambigrel
   > def extsetup():
   >     print('ambigrel.s=%s' % ambigrel.s)
   > EOF
   $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}/libroot; hg --config extensions.loadrel=loadrel.py root)
   ambigrel.s=libroot/mod/ambig.py
   $TESTTMP/a
 #endif
 
 Check absolute/relative import of extension specific modules
 
   $ mkdir $TESTTMP/extroot
   $ cat > $TESTTMP/extroot/bar.py <<EOF
   > s = 'this is extroot.bar'
   > EOF
   $ mkdir $TESTTMP/extroot/sub1
   $ cat > $TESTTMP/extroot/sub1/__init__.py <<EOF
   > s = 'this is extroot.sub1.__init__'
   > EOF
   $ cat > $TESTTMP/extroot/sub1/baz.py <<EOF
   > s = 'this is extroot.sub1.baz'
   > EOF
   $ cat > $TESTTMP/extroot/__init__.py <<EOF
   > s = 'this is extroot.__init__'
   > import foo
   > def extsetup(ui):
   >     ui.write('(extroot) ', foo.func(), '\n')
   >     ui.flush()
   > EOF
 
   $ cat > $TESTTMP/extroot/foo.py <<EOF
   > # test absolute import
   > buf = []
   > def func():
   >     # "not locals" case
   >     import extroot.bar
   >     buf.append('import extroot.bar in func(): %s' % extroot.bar.s)
   >     return '\n(extroot) '.join(buf)
   > # "fromlist == ('*',)" case
   > from extroot.bar import *
   > buf.append('from extroot.bar import *: %s' % s)
   > # "not fromlist" and "if '.' in name" case
   > import extroot.sub1.baz
   > buf.append('import extroot.sub1.baz: %s' % extroot.sub1.baz.s)
   > # "not fromlist" and NOT "if '.' in name" case
   > import extroot
   > buf.append('import extroot: %s' % extroot.s)
   > # NOT "not fromlist" and NOT "level != -1" case
   > from extroot.bar import s
   > buf.append('from extroot.bar import s: %s' % s)
   > EOF
   $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}; hg --config extensions.extroot=$TESTTMP/extroot root)
   (extroot) from extroot.bar import *: this is extroot.bar
   (extroot) import extroot.sub1.baz: this is extroot.sub1.baz
   (extroot) import extroot: this is extroot.__init__
   (extroot) from extroot.bar import s: this is extroot.bar
   (extroot) import extroot.bar in func(): this is extroot.bar
   $TESTTMP/a
 
 #if no-py3k
   $ rm "$TESTTMP"/extroot/foo.*
   $ rm -Rf "$TESTTMP/extroot/__pycache__"
   $ cat > $TESTTMP/extroot/foo.py <<EOF
   > # test relative import
   > buf = []
   > def func():
   >     # "not locals" case
   >     import bar
   >     buf.append('import bar in func(): %s' % bar.s)
   >     return '\n(extroot) '.join(buf)
   > # "fromlist == ('*',)" case
   > from bar import *
   > buf.append('from bar import *: %s' % s)
   > # "not fromlist" and "if '.' in name" case
   > import sub1.baz
   > buf.append('import sub1.baz: %s' % sub1.baz.s)
   > # "not fromlist" and NOT "if '.' in name" case
   > import sub1
   > buf.append('import sub1: %s' % sub1.s)
   > # NOT "not fromlist" and NOT "level != -1" case
   > from bar import s
   > buf.append('from bar import s: %s' % s)
   > EOF
   $ hg --config extensions.extroot=$TESTTMP/extroot root
   (extroot) from bar import *: this is extroot.bar
   (extroot) import sub1.baz: this is extroot.sub1.baz
   (extroot) import sub1: this is extroot.sub1.__init__
   (extroot) from bar import s: this is extroot.bar
   (extroot) import bar in func(): this is extroot.bar
   $TESTTMP/a
 #endif
 
 #if demandimport
 
 Examine whether module loading is delayed until actual referring, even
 though module is imported with "absolute_import" feature.
 
 Files below in each packages are used for described purpose:
 
 - "called": examine whether "from MODULE import ATTR" works correctly
 - "unused": examine whether loading is delayed correctly
 - "used":   examine whether "from PACKAGE import MODULE" works correctly
 
 Package hierarchy is needed to examine whether demand importing works
 as expected for "from SUB.PACK.AGE import MODULE".
 
 Setup "external library" to be imported with "absolute_import"
 feature.
 
   $ mkdir -p $TESTTMP/extlibroot/lsub1/lsub2
   $ touch $TESTTMP/extlibroot/__init__.py
   $ touch $TESTTMP/extlibroot/lsub1/__init__.py
   $ touch $TESTTMP/extlibroot/lsub1/lsub2/__init__.py
 
   $ cat > $TESTTMP/extlibroot/lsub1/lsub2/called.py <<EOF
   > def func():
   >     return "this is extlibroot.lsub1.lsub2.called.func()"
   > EOF
   $ cat > $TESTTMP/extlibroot/lsub1/lsub2/unused.py <<EOF
   > raise Exception("extlibroot.lsub1.lsub2.unused is loaded unintentionally")
   > EOF
   $ cat > $TESTTMP/extlibroot/lsub1/lsub2/used.py <<EOF
   > detail = "this is extlibroot.lsub1.lsub2.used"
   > EOF
 
 Setup sub-package of "external library", which causes instantiation of
 demandmod in "recurse down the module chain" code path. Relative
 importing with "absolute_import" feature isn't tested, because "level
 >=1 " doesn't cause instantiation of demandmod.
 
   $ mkdir -p $TESTTMP/extlibroot/recursedown/abs
   $ cat > $TESTTMP/extlibroot/recursedown/abs/used.py <<EOF
   > detail = "this is extlibroot.recursedown.abs.used"
   > EOF
   $ cat > $TESTTMP/extlibroot/recursedown/abs/__init__.py <<EOF
   > from __future__ import absolute_import
   > from extlibroot.recursedown.abs.used import detail
   > EOF
 
   $ mkdir -p $TESTTMP/extlibroot/recursedown/legacy
   $ cat > $TESTTMP/extlibroot/recursedown/legacy/used.py <<EOF
   > detail = "this is extlibroot.recursedown.legacy.used"
   > EOF
   $ cat > $TESTTMP/extlibroot/recursedown/legacy/__init__.py <<EOF
   > # legacy style (level == -1) import
   > from extlibroot.recursedown.legacy.used import detail
   > EOF
 
   $ cat > $TESTTMP/extlibroot/recursedown/__init__.py <<EOF
   > from __future__ import absolute_import
   > from extlibroot.recursedown.abs import detail as absdetail
   > from .legacy import detail as legacydetail
   > EOF
 
 Setup package that re-exports an attribute of its submodule as the same
 name. This leaves 'shadowing.used' pointing to 'used.detail', but still
 the submodule 'used' should be somehow accessible. (issue5617)
 
   $ mkdir -p $TESTTMP/extlibroot/shadowing
   $ cat > $TESTTMP/extlibroot/shadowing/used.py <<EOF
   > detail = "this is extlibroot.shadowing.used"
   > EOF
   $ cat > $TESTTMP/extlibroot/shadowing/proxied.py <<EOF
   > from __future__ import absolute_import
   > from extlibroot.shadowing.used import detail
   > EOF
   $ cat > $TESTTMP/extlibroot/shadowing/__init__.py <<EOF
   > from __future__ import absolute_import
   > from .used import detail as used
   > EOF
 
 Setup extension local modules to be imported with "absolute_import"
 feature.
 
   $ mkdir -p $TESTTMP/absextroot/xsub1/xsub2
   $ touch $TESTTMP/absextroot/xsub1/__init__.py
   $ touch $TESTTMP/absextroot/xsub1/xsub2/__init__.py
 
   $ cat > $TESTTMP/absextroot/xsub1/xsub2/called.py <<EOF
   > def func():
   >     return "this is absextroot.xsub1.xsub2.called.func()"
   > EOF
   $ cat > $TESTTMP/absextroot/xsub1/xsub2/unused.py <<EOF
   > raise Exception("absextroot.xsub1.xsub2.unused is loaded unintentionally")
   > EOF
   $ cat > $TESTTMP/absextroot/xsub1/xsub2/used.py <<EOF
   > detail = "this is absextroot.xsub1.xsub2.used"
   > EOF
 
 Setup extension local modules to examine whether demand importing
 works as expected in "level > 1" case.
 
   $ cat > $TESTTMP/absextroot/relimportee.py <<EOF
   > detail = "this is absextroot.relimportee"
   > EOF
   $ cat > $TESTTMP/absextroot/xsub1/xsub2/relimporter.py <<EOF
   > from __future__ import absolute_import
   > from ... import relimportee
   > detail = "this relimporter imports %r" % (relimportee.detail)
   > EOF
 
 Setup modules, which actually import extension local modules at
 runtime.
 
   $ cat > $TESTTMP/absextroot/absolute.py << EOF
   > from __future__ import absolute_import
   > 
   > # import extension local modules absolutely (level = 0)
   > from absextroot.xsub1.xsub2 import used, unused
   > from absextroot.xsub1.xsub2.called import func
   > 
   > def getresult():
   >     result = []
   >     result.append(used.detail)
   >     result.append(func())
   >     return result
   > EOF
 
   $ cat > $TESTTMP/absextroot/relative.py << EOF
   > from __future__ import absolute_import
   > 
   > # import extension local modules relatively (level == 1)
   > from .xsub1.xsub2 import used, unused
   > from .xsub1.xsub2.called import func
   > 
   > # import a module, which implies "importing with level > 1"
   > from .xsub1.xsub2 import relimporter
   > 
   > def getresult():
   >     result = []
   >     result.append(used.detail)
   >     result.append(func())
   >     result.append(relimporter.detail)
   >     return result
   > EOF
 
 Setup main procedure of extension.
 
   $ cat > $TESTTMP/absextroot/__init__.py <<EOF
   > from __future__ import absolute_import
   > from mercurial import registrar
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > 
   > # "absolute" and "relative" shouldn't be imported before actual
   > # command execution, because (1) they import same modules, and (2)
   > # preceding import (= instantiate "demandmod" object instead of
   > # real "module" object) might hide problem of succeeding import.
   > 
   > @command(b'showabsolute', [], norepo=True)
   > def showabsolute(ui, *args, **opts):
   >     from absextroot import absolute
   >     ui.write(b'ABS: %s\n' % '\nABS: '.join(absolute.getresult()))
   > 
   > @command(b'showrelative', [], norepo=True)
   > def showrelative(ui, *args, **opts):
   >     from . import relative
   >     ui.write(b'REL: %s\n' % '\nREL: '.join(relative.getresult()))
   > 
   > # import modules from external library
   > from extlibroot.lsub1.lsub2 import used as lused, unused as lunused
   > from extlibroot.lsub1.lsub2.called import func as lfunc
   > from extlibroot.recursedown import absdetail, legacydetail
   > from extlibroot.shadowing import proxied
   > 
   > def uisetup(ui):
   >     result = []
   >     result.append(lused.detail)
   >     result.append(lfunc())
   >     result.append(absdetail)
   >     result.append(legacydetail)
   >     result.append(proxied.detail)
   >     ui.write('LIB: %s\n' % '\nLIB: '.join(result))
   > EOF
 
 Examine module importing.
 
   $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}; hg --config extensions.absextroot=$TESTTMP/absextroot showabsolute)
   LIB: this is extlibroot.lsub1.lsub2.used
   LIB: this is extlibroot.lsub1.lsub2.called.func()
   LIB: this is extlibroot.recursedown.abs.used
   LIB: this is extlibroot.recursedown.legacy.used
   LIB: this is extlibroot.shadowing.used
   ABS: this is absextroot.xsub1.xsub2.used
   ABS: this is absextroot.xsub1.xsub2.called.func()
 
   $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}; hg --config extensions.absextroot=$TESTTMP/absextroot showrelative)
   LIB: this is extlibroot.lsub1.lsub2.used
   LIB: this is extlibroot.lsub1.lsub2.called.func()
   LIB: this is extlibroot.recursedown.abs.used
   LIB: this is extlibroot.recursedown.legacy.used
   LIB: this is extlibroot.shadowing.used
   REL: this is absextroot.xsub1.xsub2.used
   REL: this is absextroot.xsub1.xsub2.called.func()
   REL: this relimporter imports 'this is absextroot.relimportee'
 
 Examine whether sub-module is imported relatively as expected.
 
 See also issue5208 for detail about example case on Python 3.x.
 
   $ f -q $TESTTMP/extlibroot/lsub1/lsub2/notexist.py
   $TESTTMP/extlibroot/lsub1/lsub2/notexist.py: file not found
 
   $ cat > $TESTTMP/notexist.py <<EOF
   > text = 'notexist.py at root is loaded unintentionally\n'
   > EOF
 
   $ cat > $TESTTMP/checkrelativity.py <<EOF
   > from mercurial import registrar
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > 
   > # demand import avoids failure of importing notexist here
   > import extlibroot.lsub1.lsub2.notexist
   > 
   > @command(b'checkrelativity', [], norepo=True)
   > def checkrelativity(ui, *args, **opts):
   >     try:
   >         ui.write(extlibroot.lsub1.lsub2.notexist.text)
   >         return 1 # unintentional success
   >     except ImportError:
   >         pass # intentional failure
   > EOF
 
   $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}; hg --config extensions.checkrelativity=$TESTTMP/checkrelativity.py checkrelativity)
 
 #endif
 
 Make sure a broken uisetup doesn't globally break hg:
   $ cat > $TESTTMP/baduisetup.py <<EOF
   > def uisetup(ui):
   >     1/0
   > EOF
 
 Even though the extension fails during uisetup, hg is still basically usable:
   $ hg --config extensions.baduisetup=$TESTTMP/baduisetup.py version
   Traceback (most recent call last):
     File "*/mercurial/extensions.py", line *, in _runuisetup (glob)
       uisetup(ui)
     File "$TESTTMP/baduisetup.py", line 2, in uisetup
       1/0
   ZeroDivisionError: integer division or modulo by zero
   *** failed to set up extension baduisetup: integer division or modulo by zero
   Mercurial Distributed SCM (version *) (glob)
   (see https://mercurial-scm.org for more information)
   
   Copyright (C) 2005-* Matt Mackall and others (glob)
   This is free software; see the source for copying conditions. There is NO
   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
   $ cd ..
 
 hide outer repo
   $ hg init
 
   $ cat > empty.py <<EOF
   > '''empty cmdtable
   > '''
   > cmdtable = {}
   > EOF
   $ emptypath=`pwd`/empty.py
   $ echo "empty = $emptypath" >> $HGRCPATH
   $ hg help empty
   empty extension - empty cmdtable
   
   no commands defined
 
 
   $ echo 'empty = !' >> $HGRCPATH
 
   $ cat > debugextension.py <<EOF
   > '''only debugcommands
   > '''
   > from mercurial import registrar
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > @command(b'debugfoobar', [], b'hg debugfoobar')
   > def debugfoobar(ui, repo, *args, **opts):
   >     "yet another debug command"
   >     pass
   > @command(b'foo', [], b'hg foo')
   > def foo(ui, repo, *args, **opts):
   >     """yet another foo command
   >     This command has been DEPRECATED since forever.
   >     """
   >     pass
   > EOF
   $ debugpath=`pwd`/debugextension.py
   $ echo "debugextension = $debugpath" >> $HGRCPATH
 
   $ hg help debugextension
   hg debugextensions
   
   show information about active extensions
   
   options:
   
   (some details hidden, use --verbose to show complete help)
 
 
   $ hg --verbose help debugextension
   hg debugextensions
   
   show information about active extensions
   
   options:
   
    -T --template TEMPLATE display with template (EXPERIMENTAL)
   
   global options ([+] can be repeated):
   
    -R --repository REPO   repository root directory or name of overlay bundle
                           file
       --cwd DIR           change working directory
    -y --noninteractive    do not prompt, automatically pick the first choice for
                           all prompts
    -q --quiet             suppress output
    -v --verbose           enable additional output
       --color TYPE        when to colorize (boolean, always, auto, never, or
                           debug)
       --config CONFIG [+] set/override config option (use 'section.name=value')
       --debug             enable debugging output
       --debugger          start debugger
       --encoding ENCODE   set the charset encoding (default: ascii)
       --encodingmode MODE set the charset encoding mode (default: strict)
       --traceback         always print a traceback on exception
       --time              time how long the command takes
       --profile           print command execution profile
       --version           output version information and exit
    -h --help              display help and exit
       --hidden            consider hidden changesets
       --pager TYPE        when to paginate (boolean, always, auto, or never)
                           (default: auto)
 
 
 
 
 
 
   $ hg --debug help debugextension
   hg debugextensions
   
   show information about active extensions
   
   options:
   
    -T --template TEMPLATE display with template (EXPERIMENTAL)
   
   global options ([+] can be repeated):
   
    -R --repository REPO   repository root directory or name of overlay bundle
                           file
       --cwd DIR           change working directory
    -y --noninteractive    do not prompt, automatically pick the first choice for
                           all prompts
    -q --quiet             suppress output
    -v --verbose           enable additional output
       --color TYPE        when to colorize (boolean, always, auto, never, or
                           debug)
       --config CONFIG [+] set/override config option (use 'section.name=value')
       --debug             enable debugging output
       --debugger          start debugger
       --encoding ENCODE   set the charset encoding (default: ascii)
       --encodingmode MODE set the charset encoding mode (default: strict)
       --traceback         always print a traceback on exception
       --time              time how long the command takes
       --profile           print command execution profile
       --version           output version information and exit
    -h --help              display help and exit
       --hidden            consider hidden changesets
       --pager TYPE        when to paginate (boolean, always, auto, or never)
                           (default: auto)
 
 
 
 
 
   $ echo 'debugextension = !' >> $HGRCPATH
 
 Asking for help about a deprecated extension should do something useful:
 
   $ hg help glog
   'glog' is provided by the following extension:
   
       graphlog      command to view revision graphs from a shell (DEPRECATED)
   
   (use 'hg help extensions' for information on enabling extensions)
 
 Extension module help vs command help:
 
   $ echo 'extdiff =' >> $HGRCPATH
   $ hg help extdiff
   hg extdiff [OPT]... [FILE]...
   
   use external program to diff repository (or selected files)
   
       Show differences between revisions for the specified files, using an
       external program. The default program used is diff, with default options
       "-Npru".
   
       To select a different program, use the -p/--program option. The program
       will be passed the names of two directories to compare. To pass additional
       options to the program, use -o/--option. These will be passed before the
       names of the directories to compare.
   
       When two revision arguments are given, then changes are shown between
       those revisions. If only one revision is specified then that revision is
       compared to the working directory, and, when no revisions are specified,
       the working directory files are compared to its parent.
   
   (use 'hg help -e extdiff' to show help for the extdiff extension)
   
   options ([+] can be repeated):
   
    -p --program CMD         comparison program to run
    -o --option OPT [+]      pass option to comparison program
    -r --rev REV [+]         revision
    -c --change REV          change made by revision
       --patch               compare patches for two revisions
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
   
   (some details hidden, use --verbose to show complete help)
 
 
 
 
 
 
 
 
 
 
   $ hg help --extension extdiff
   extdiff extension - command to allow external programs to compare revisions
   
   The extdiff Mercurial extension allows you to use external programs to compare
   revisions, or revision with working directory. The external diff programs are
   called with a configurable set of options and two non-option arguments: paths
   to directories containing snapshots of files to compare.
   
+  If there is more than one file being compared and the "child" revision is the
+  working directory, any modifications made in the external diff program will be
+  copied back to the working directory from the temporary directory.
+  
   The extdiff extension also allows you to configure new diff commands, so you
   do not need to type 'hg extdiff -p kdiff3' always.
   
     [extdiff]
     # add new command that runs GNU diff(1) in 'context diff' mode
     cdiff = gdiff -Nprc5
     ## or the old way:
     #cmd.cdiff = gdiff
     #opts.cdiff = -Nprc5
   
     # add new command called meld, runs meld (no need to name twice).  If
     # the meld executable is not available, the meld tool in [merge-tools]
     # will be used, if available
     meld =
   
     # add new command called vimdiff, runs gvimdiff with DirDiff plugin
     # (see http://www.vim.org/scripts/script.php?script_id=102) Non
     # English user, be sure to put "let g:DirDiffDynamicDiffText = 1" in
     # your .vimrc
     vimdiff = gvim -f "+next" \
               "+execute 'DirDiff' fnameescape(argv(0)) fnameescape(argv(1))"
   
   Tool arguments can include variables that are expanded at runtime:
   
     $parent1, $plabel1 - filename, descriptive label of first parent
     $child,   $clabel  - filename, descriptive label of child revision
     $parent2, $plabel2 - filename, descriptive label of second parent
     $root              - repository root
     $parent is an alias for $parent1.
   
   The extdiff extension will look in your [diff-tools] and [merge-tools]
   sections for diff tool arguments, when none are specified in [extdiff].
   
     [extdiff]
     kdiff3 =
   
     [diff-tools]
     kdiff3.diffargs=--L1 '$plabel1' --L2 '$clabel' $parent $child
   
   You can use -I/-X and list of file or directory names like normal 'hg diff'
   command. The extdiff extension makes snapshots of only needed files, so
   running the external diff program will actually be pretty fast (at least
   faster than having to compare the entire tree).
   
   list of commands:
   
    extdiff       use external program to diff repository (or selected files)
   
   (use 'hg help -v -e extdiff' to show built-in aliases and global options)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   $ echo 'extdiff = !' >> $HGRCPATH
 
 Test help topic with same name as extension
 
   $ cat > multirevs.py <<EOF
   > from mercurial import commands, registrar
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > """multirevs extension
   > Big multi-line module docstring."""
   > @command(b'multirevs', [], b'ARG', norepo=True)
   > def multirevs(ui, repo, arg, *args, **opts):
   >     """multirevs command"""
   >     pass
   > EOF
   $ echo "multirevs = multirevs.py" >> $HGRCPATH
 
   $ hg help multirevs | tail
         used):
   
           hg update :@
   
       - Show diff between tags 1.3 and 1.5 (this works because the first and the
         last revisions of the revset are used):
   
           hg diff -r 1.3::1.5
   
   use 'hg help -c multirevs' to see help for the multirevs command
 
 
 
 
 
 
   $ hg help -c multirevs
   hg multirevs ARG
   
   multirevs command
   
   (some details hidden, use --verbose to show complete help)
 
 
 
   $ hg multirevs
   hg multirevs: invalid arguments
   hg multirevs ARG
   
   multirevs command
   
   (use 'hg multirevs -h' to show more help)
   [255]
 
 
 
   $ echo "multirevs = !" >> $HGRCPATH
 
 Issue811: Problem loading extensions twice (by site and by user)
 
   $ cat <<EOF >> $HGRCPATH
   > mq =
   > strip =
   > hgext.mq =
   > hgext/mq =
   > EOF
 
 Show extensions:
 (note that mq force load strip, also checking it's not loaded twice)
 
   $ hg debugextensions
   mq
   strip
 
 For extensions, which name matches one of its commands, help
 message should ask '-v -e' to get list of built-in aliases
 along with extension help itself
 
   $ mkdir $TESTTMP/d
   $ cat > $TESTTMP/d/dodo.py <<EOF
   > """
   > This is an awesome 'dodo' extension. It does nothing and
   > writes 'Foo foo'
   > """
   > from mercurial import commands, registrar
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > @command(b'dodo', [], b'hg dodo')
   > def dodo(ui, *args, **kwargs):
   >     """Does nothing"""
   >     ui.write(b"I do nothing. Yay\\n")
   > @command(b'foofoo', [], b'hg foofoo')
   > def foofoo(ui, *args, **kwargs):
   >     """Writes 'Foo foo'"""
   >     ui.write(b"Foo foo\\n")
   > EOF
   $ dodopath=$TESTTMP/d/dodo.py
 
   $ echo "dodo = $dodopath" >> $HGRCPATH
 
 Make sure that user is asked to enter '-v -e' to get list of built-in aliases
   $ hg help -e dodo
   dodo extension -
   
   This is an awesome 'dodo' extension. It does nothing and writes 'Foo foo'
   
   list of commands:
   
    dodo          Does nothing
    foofoo        Writes 'Foo foo'
   
   (use 'hg help -v -e dodo' to show built-in aliases and global options)
 
 Make sure that '-v -e' prints list of built-in aliases along with
 extension help itself
   $ hg help -v -e dodo
   dodo extension -
   
   This is an awesome 'dodo' extension. It does nothing and writes 'Foo foo'
   
   list of commands:
   
    dodo          Does nothing
    foofoo        Writes 'Foo foo'
   
   global options ([+] can be repeated):
   
    -R --repository REPO   repository root directory or name of overlay bundle
                           file
       --cwd DIR           change working directory
    -y --noninteractive    do not prompt, automatically pick the first choice for
                           all prompts
    -q --quiet             suppress output
    -v --verbose           enable additional output
       --color TYPE        when to colorize (boolean, always, auto, never, or
                           debug)
       --config CONFIG [+] set/override config option (use 'section.name=value')
       --debug             enable debugging output
       --debugger          start debugger
       --encoding ENCODE   set the charset encoding (default: ascii)
       --encodingmode MODE set the charset encoding mode (default: strict)
       --traceback         always print a traceback on exception
       --time              time how long the command takes
       --profile           print command execution profile
       --version           output version information and exit
    -h --help              display help and exit
       --hidden            consider hidden changesets
       --pager TYPE        when to paginate (boolean, always, auto, or never)
                           (default: auto)
 
 Make sure that single '-v' option shows help and built-ins only for 'dodo' command
   $ hg help -v dodo
   hg dodo
   
   Does nothing
   
   (use 'hg help -e dodo' to show help for the dodo extension)
   
   options:
   
     --mq operate on patch repository
   
   global options ([+] can be repeated):
   
    -R --repository REPO   repository root directory or name of overlay bundle
                           file
       --cwd DIR           change working directory
    -y --noninteractive    do not prompt, automatically pick the first choice for
                           all prompts
    -q --quiet             suppress output
    -v --verbose           enable additional output
       --color TYPE        when to colorize (boolean, always, auto, never, or
                           debug)
       --config CONFIG [+] set/override config option (use 'section.name=value')
       --debug             enable debugging output
       --debugger          start debugger
       --encoding ENCODE   set the charset encoding (default: ascii)
       --encodingmode MODE set the charset encoding mode (default: strict)
       --traceback         always print a traceback on exception
       --time              time how long the command takes
       --profile           print command execution profile
       --version           output version information and exit
    -h --help              display help and exit
       --hidden            consider hidden changesets
       --pager TYPE        when to paginate (boolean, always, auto, or never)
                           (default: auto)
 
 In case when extension name doesn't match any of its commands,
 help message should ask for '-v' to get list of built-in aliases
 along with extension help
   $ cat > $TESTTMP/d/dudu.py <<EOF
   > """
   > This is an awesome 'dudu' extension. It does something and
   > also writes 'Beep beep'
   > """
   > from mercurial import commands, registrar
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > @command(b'something', [], b'hg something')
   > def something(ui, *args, **kwargs):
   >     """Does something"""
   >     ui.write(b"I do something. Yaaay\\n")
   > @command(b'beep', [], b'hg beep')
   > def beep(ui, *args, **kwargs):
   >     """Writes 'Beep beep'"""
   >     ui.write(b"Beep beep\\n")
   > EOF
   $ dudupath=$TESTTMP/d/dudu.py
 
   $ echo "dudu = $dudupath" >> $HGRCPATH
 
   $ hg help -e dudu
   dudu extension -
   
   This is an awesome 'dudu' extension. It does something and also writes 'Beep
   beep'
   
   list of commands:
   
    beep          Writes 'Beep beep'
    something     Does something
   
   (use 'hg help -v dudu' to show built-in aliases and global options)
 
 In case when extension name doesn't match any of its commands,
 help options '-v' and '-v -e' should be equivalent
   $ hg help -v dudu
   dudu extension -
   
   This is an awesome 'dudu' extension. It does something and also writes 'Beep
   beep'
   
   list of commands:
   
    beep          Writes 'Beep beep'
    something     Does something
   
   global options ([+] can be repeated):
   
    -R --repository REPO   repository root directory or name of overlay bundle
                           file
       --cwd DIR           change working directory
    -y --noninteractive    do not prompt, automatically pick the first choice for
                           all prompts
    -q --quiet             suppress output
    -v --verbose           enable additional output
       --color TYPE        when to colorize (boolean, always, auto, never, or
                           debug)
       --config CONFIG [+] set/override config option (use 'section.name=value')
       --debug             enable debugging output
       --debugger          start debugger
       --encoding ENCODE   set the charset encoding (default: ascii)
       --encodingmode MODE set the charset encoding mode (default: strict)
       --traceback         always print a traceback on exception
       --time              time how long the command takes
       --profile           print command execution profile
       --version           output version information and exit
    -h --help              display help and exit
       --hidden            consider hidden changesets
       --pager TYPE        when to paginate (boolean, always, auto, or never)
                           (default: auto)
 
   $ hg help -v -e dudu
   dudu extension -
   
   This is an awesome 'dudu' extension. It does something and also writes 'Beep
   beep'
   
   list of commands:
   
    beep          Writes 'Beep beep'
    something     Does something
   
   global options ([+] can be repeated):
   
    -R --repository REPO   repository root directory or name of overlay bundle
                           file
       --cwd DIR           change working directory
    -y --noninteractive    do not prompt, automatically pick the first choice for
                           all prompts
    -q --quiet             suppress output
    -v --verbose           enable additional output
       --color TYPE        when to colorize (boolean, always, auto, never, or
                           debug)
       --config CONFIG [+] set/override config option (use 'section.name=value')
       --debug             enable debugging output
       --debugger          start debugger
       --encoding ENCODE   set the charset encoding (default: ascii)
       --encodingmode MODE set the charset encoding mode (default: strict)
       --traceback         always print a traceback on exception
       --time              time how long the command takes
       --profile           print command execution profile
       --version           output version information and exit
    -h --help              display help and exit
       --hidden            consider hidden changesets
       --pager TYPE        when to paginate (boolean, always, auto, or never)
                           (default: auto)
 
 Disabled extension commands:
 
   $ ORGHGRCPATH=$HGRCPATH
   $ HGRCPATH=
   $ export HGRCPATH
   $ hg help email
   'email' is provided by the following extension:
   
       patchbomb     command to send changesets as (a series of) patch emails
   
   (use 'hg help extensions' for information on enabling extensions)
 
 
   $ hg qdel
   hg: unknown command 'qdel'
   'qdelete' is provided by the following extension:
   
       mq            manage a stack of patches
   
   (use 'hg help extensions' for information on enabling extensions)
   [255]
 
 
   $ hg churn
   hg: unknown command 'churn'
   'churn' is provided by the following extension:
   
       churn         command to display statistics about repository history
   
   (use 'hg help extensions' for information on enabling extensions)
   [255]
 
 
 
 Disabled extensions:
 
   $ hg help churn
   churn extension - command to display statistics about repository history
   
   (use 'hg help extensions' for information on enabling extensions)
 
   $ hg help patchbomb
   patchbomb extension - command to send changesets as (a series of) patch emails
   
   The series is started off with a "[PATCH 0 of N]" introduction, which
   describes the series as a whole.
   
   Each patch email has a Subject line of "[PATCH M of N] ...", using the first
   line of the changeset description as the subject text. The message contains
   two or three body parts:
   
   - The changeset description.
   - [Optional] The result of running diffstat on the patch.
   - The patch itself, as generated by 'hg export'.
   
   Each message refers to the first in the series using the In-Reply-To and
   References headers, so they will show up as a sequence in threaded mail and
   news readers, and in mail archives.
   
   To configure other defaults, add a section like this to your configuration
   file:
   
     [email]
     from = My Name <my@email>
     to = recipient1, recipient2, ...
     cc = cc1, cc2, ...
     bcc = bcc1, bcc2, ...
     reply-to = address1, address2, ...
   
   Use "[patchbomb]" as configuration section name if you need to override global
   "[email]" address settings.
   
   Then you can use the 'hg email' command to mail a series of changesets as a
   patchbomb.
   
   You can also either configure the method option in the email section to be a
   sendmail compatible mailer or fill out the [smtp] section so that the
   patchbomb extension can automatically send patchbombs directly from the
   commandline. See the [email] and [smtp] sections in hgrc(5) for details.
   
   By default, 'hg email' will prompt for a "To" or "CC" header if you do not
   supply one via configuration or the command line.  You can override this to
   never prompt by configuring an empty value:
   
     [email]
     cc =
   
   You can control the default inclusion of an introduction message with the
   "patchbomb.intro" configuration option. The configuration is always
   overwritten by command line flags like --intro and --desc:
   
     [patchbomb]
     intro=auto   # include introduction message if more than 1 patch (default)
     intro=never  # never include an introduction message
     intro=always # always include an introduction message
   
   You can specify a template for flags to be added in subject prefixes. Flags
   specified by --flag option are exported as "{flags}" keyword:
   
     [patchbomb]
     flagtemplate = "{separate(' ',
                               ifeq(branch, 'default', '', branch|upper),
                               flags)}"
   
   You can set patchbomb to always ask for confirmation by setting
   "patchbomb.confirm" to true.
   
   (use 'hg help extensions' for information on enabling extensions)
 
 
 Broken disabled extension and command:
 
   $ mkdir hgext
   $ echo > hgext/__init__.py
   $ cat > hgext/broken.py <<EOF
   > "broken extension'
   > EOF
   $ cat > path.py <<EOF
   > import os, sys
   > sys.path.insert(0, os.environ['HGEXTPATH'])
   > EOF
   $ HGEXTPATH=`pwd`
   $ export HGEXTPATH
 
   $ hg --config extensions.path=./path.py help broken
   broken extension - (no help text available)
   
   (use 'hg help extensions' for information on enabling extensions)
 
 
   $ cat > hgext/forest.py <<EOF
   > cmdtable = None
   > EOF
   $ hg --config extensions.path=./path.py help foo > /dev/null
   warning: error finding commands in $TESTTMP/hgext/forest.py
   abort: no such help topic: foo
   (try 'hg help --keyword foo')
   [255]
 
   $ cat > throw.py <<EOF
   > from mercurial import commands, registrar, util
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > class Bogon(Exception): pass
   > @command(b'throw', [], b'hg throw', norepo=True)
   > def throw(ui, **opts):
   >     """throws an exception"""
   >     raise Bogon()
   > EOF
 
 No declared supported version, extension complains:
   $ hg --config extensions.throw=throw.py throw 2>&1 | egrep '^\*\*'
   ** Unknown exception encountered with possibly-broken third-party extension throw
   ** which supports versions unknown of Mercurial.
   ** Please disable throw and try your action again.
   ** If that fixes the bug please report it to the extension author.
   ** Python * (glob)
   ** Mercurial Distributed SCM * (glob)
   ** Extensions loaded: throw
 
 empty declaration of supported version, extension complains:
   $ echo "testedwith = ''" >> throw.py
   $ hg --config extensions.throw=throw.py throw 2>&1 | egrep '^\*\*'
   ** Unknown exception encountered with possibly-broken third-party extension throw
   ** which supports versions unknown of Mercurial.
   ** Please disable throw and try your action again.
   ** If that fixes the bug please report it to the extension author.
   ** Python * (glob)
   ** Mercurial Distributed SCM (*) (glob)
   ** Extensions loaded: throw
 
 If the extension specifies a buglink, show that:
   $ echo 'buglink = "http://example.com/bts"' >> throw.py
   $ rm -f throw.pyc throw.pyo
   $ rm -Rf __pycache__
   $ hg --config extensions.throw=throw.py throw 2>&1 | egrep '^\*\*'
   ** Unknown exception encountered with possibly-broken third-party extension throw
   ** which supports versions unknown of Mercurial.
   ** Please disable throw and try your action again.
   ** If that fixes the bug please report it to http://example.com/bts
   ** Python * (glob)
   ** Mercurial Distributed SCM (*) (glob)
   ** Extensions loaded: throw
 
 If the extensions declare outdated versions, accuse the older extension first:
   $ echo "from mercurial import util" >> older.py
   $ echo "util.version = lambda:'2.2'" >> older.py
   $ echo "testedwith = b'1.9.3'" >> older.py
   $ echo "testedwith = b'2.1.1'" >> throw.py
   $ rm -f throw.pyc throw.pyo
   $ rm -Rf __pycache__
   $ hg --config extensions.throw=throw.py --config extensions.older=older.py \
   >   throw 2>&1 | egrep '^\*\*'
   ** Unknown exception encountered with possibly-broken third-party extension older
   ** which supports versions 1.9 of Mercurial.
   ** Please disable older and try your action again.
   ** If that fixes the bug please report it to the extension author.
   ** Python * (glob)
   ** Mercurial Distributed SCM (version 2.2)
   ** Extensions loaded: throw, older
 
 One extension only tested with older, one only with newer versions:
   $ echo "util.version = lambda:b'2.1'" >> older.py
   $ rm -f older.pyc older.pyo
   $ rm -Rf __pycache__
   $ hg --config extensions.throw=throw.py --config extensions.older=older.py \
   >   throw 2>&1 | egrep '^\*\*'
   ** Unknown exception encountered with possibly-broken third-party extension older
   ** which supports versions 1.9 of Mercurial.
   ** Please disable older and try your action again.
   ** If that fixes the bug please report it to the extension author.
   ** Python * (glob)
   ** Mercurial Distributed SCM (version 2.1)
   ** Extensions loaded: throw, older
 
 Older extension is tested with current version, the other only with newer:
   $ echo "util.version = lambda:b'1.9.3'" >> older.py
   $ rm -f older.pyc older.pyo
   $ rm -Rf __pycache__
   $ hg --config extensions.throw=throw.py --config extensions.older=older.py \
   >   throw 2>&1 | egrep '^\*\*'
   ** Unknown exception encountered with possibly-broken third-party extension throw
   ** which supports versions 2.1 of Mercurial.
   ** Please disable throw and try your action again.
   ** If that fixes the bug please report it to http://example.com/bts
   ** Python * (glob)
   ** Mercurial Distributed SCM (version 1.9.3)
   ** Extensions loaded: throw, older
 
 Ability to point to a different point
   $ hg --config extensions.throw=throw.py --config extensions.older=older.py \
   >   --config ui.supportcontact='Your Local Goat Lenders' throw 2>&1 | egrep '^\*\*'
   ** unknown exception encountered, please report by visiting
   ** Your Local Goat Lenders
   ** Python * (glob)
   ** Mercurial Distributed SCM (*) (glob)
   ** Extensions loaded: throw, older
 
 Declare the version as supporting this hg version, show regular bts link:
   $ hgver=`hg debuginstall -T '{hgver}'`
   $ echo 'testedwith = """'"$hgver"'"""' >> throw.py
   $ if [ -z "$hgver" ]; then
   >   echo "unable to fetch a mercurial version. Make sure __version__ is correct";
   > fi
   $ rm -f throw.pyc throw.pyo
   $ rm -Rf __pycache__
   $ hg --config extensions.throw=throw.py throw 2>&1 | egrep '^\*\*'
   ** unknown exception encountered, please report by visiting
   ** https://mercurial-scm.org/wiki/BugTracker
   ** Python * (glob)
   ** Mercurial Distributed SCM (*) (glob)
   ** Extensions loaded: throw
 
 Patch version is ignored during compatibility check
   $ echo "testedwith = b'3.2'" >> throw.py
   $ echo "util.version = lambda:b'3.2.2'" >> throw.py
   $ rm -f throw.pyc throw.pyo
   $ rm -Rf __pycache__
   $ hg --config extensions.throw=throw.py throw 2>&1 | egrep '^\*\*'
   ** unknown exception encountered, please report by visiting
   ** https://mercurial-scm.org/wiki/BugTracker
   ** Python * (glob)
   ** Mercurial Distributed SCM (*) (glob)
   ** Extensions loaded: throw
 
 Test version number support in 'hg version':
   $ echo '__version__ = (1, 2, 3)' >> throw.py
   $ rm -f throw.pyc throw.pyo
   $ rm -Rf __pycache__
   $ hg version -v
   Mercurial Distributed SCM (version *) (glob)
   (see https://mercurial-scm.org for more information)
   
   Copyright (C) 2005-* Matt Mackall and others (glob)
   This is free software; see the source for copying conditions. There is NO
   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   
   Enabled extensions:
   
 
   $ hg version -v --config extensions.throw=throw.py
   Mercurial Distributed SCM (version *) (glob)
   (see https://mercurial-scm.org for more information)
   
   Copyright (C) 2005-* Matt Mackall and others (glob)
   This is free software; see the source for copying conditions. There is NO
   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   
   Enabled extensions:
   
     throw  external  1.2.3
   $ echo 'getversion = lambda: "1.twentythree"' >> throw.py
   $ rm -f throw.pyc throw.pyo
   $ rm -Rf __pycache__
   $ hg version -v --config extensions.throw=throw.py --config extensions.strip=
   Mercurial Distributed SCM (version *) (glob)
   (see https://mercurial-scm.org for more information)
   
   Copyright (C) 2005-* Matt Mackall and others (glob)
   This is free software; see the source for copying conditions. There is NO
   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   
   Enabled extensions:
   
     throw  external  1.twentythree
     strip  internal  
 
   $ hg version -q --config extensions.throw=throw.py
   Mercurial Distributed SCM (version *) (glob)
 
 Test JSON output of version:
 
   $ hg version -Tjson
   [
    {
     "extensions": [],
     "ver": "*" (glob)
    }
   ]
 
   $ hg version --config extensions.throw=throw.py -Tjson
   [
    {
     "extensions": [{"bundled": false, "name": "throw", "ver": "1.twentythree"}],
     "ver": "3.2.2"
    }
   ]
 
   $ hg version --config extensions.strip= -Tjson
   [
    {
     "extensions": [{"bundled": true, "name": "strip", "ver": null}],
     "ver": "*" (glob)
    }
   ]
 
 Test template output of version:
 
   $ hg version --config extensions.throw=throw.py --config extensions.strip= \
   > -T'{extensions % "{name}  {pad(ver, 16)}  ({if(bundled, "internal", "external")})\n"}'
   throw  1.twentythree     (external)
   strip                    (internal)
 
 Refuse to load extensions with minimum version requirements
 
   $ cat > minversion1.py << EOF
   > from mercurial import util
   > util.version = lambda: b'3.5.2'
   > minimumhgversion = b'3.6'
   > EOF
   $ hg --config extensions.minversion=minversion1.py version
   (third party extension minversion requires version 3.6 or newer of Mercurial; disabling)
   Mercurial Distributed SCM (version 3.5.2)
   (see https://mercurial-scm.org for more information)
   
   Copyright (C) 2005-* Matt Mackall and others (glob)
   This is free software; see the source for copying conditions. There is NO
   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
   $ cat > minversion2.py << EOF
   > from mercurial import util
   > util.version = lambda: b'3.6'
   > minimumhgversion = b'3.7'
   > EOF
   $ hg --config extensions.minversion=minversion2.py version 2>&1 | egrep '\(third'
   (third party extension minversion requires version 3.7 or newer of Mercurial; disabling)
 
 Can load version that is only off by point release
 
   $ cat > minversion2.py << EOF
   > from mercurial import util
   > util.version = lambda: b'3.6.1'
   > minimumhgversion = b'3.6'
   > EOF
   $ hg --config extensions.minversion=minversion3.py version 2>&1 | egrep '\(third'
   [1]
 
 Can load minimum version identical to current
 
   $ cat > minversion3.py << EOF
   > from mercurial import util
   > util.version = lambda: b'3.5'
   > minimumhgversion = b'3.5'
   > EOF
   $ hg --config extensions.minversion=minversion3.py version 2>&1 | egrep '\(third'
   [1]
 
 Restore HGRCPATH
 
   $ HGRCPATH=$ORGHGRCPATH
   $ export HGRCPATH
 
 Commands handling multiple repositories at a time should invoke only
 "reposetup()" of extensions enabling in the target repository.
 
   $ mkdir reposetup-test
   $ cd reposetup-test
 
   $ cat > $TESTTMP/reposetuptest.py <<EOF
   > from mercurial import extensions
   > def reposetup(ui, repo):
   >     ui.write(b'reposetup() for %s\n' % (repo.root))
   >     ui.flush()
   > EOF
   $ hg init src
   $ echo a > src/a
   $ hg -R src commit -Am '#0 at src/a'
   adding a
   $ echo '[extensions]' >> src/.hg/hgrc
   $ echo '# enable extension locally' >> src/.hg/hgrc
   $ echo "reposetuptest = $TESTTMP/reposetuptest.py" >> src/.hg/hgrc
   $ hg -R src status
   reposetup() for $TESTTMP/reposetup-test/src
   reposetup() for $TESTTMP/reposetup-test/src (chg !)
 
   $ hg clone -U src clone-dst1
   reposetup() for $TESTTMP/reposetup-test/src
   $ hg init push-dst1
   $ hg -q -R src push push-dst1
   reposetup() for $TESTTMP/reposetup-test/src
   $ hg init pull-src1
   $ hg -q -R pull-src1 pull src
   reposetup() for $TESTTMP/reposetup-test/src
 
   $ cat <<EOF >> $HGRCPATH
   > [extensions]
   > # disable extension globally and explicitly
   > reposetuptest = !
   > EOF
   $ hg clone -U src clone-dst2
   reposetup() for $TESTTMP/reposetup-test/src
   $ hg init push-dst2
   $ hg -q -R src push push-dst2
   reposetup() for $TESTTMP/reposetup-test/src
   $ hg init pull-src2
   $ hg -q -R pull-src2 pull src
   reposetup() for $TESTTMP/reposetup-test/src
 
   $ cat <<EOF >> $HGRCPATH
   > [extensions]
   > # enable extension globally
   > reposetuptest = $TESTTMP/reposetuptest.py
   > EOF
   $ hg clone -U src clone-dst3
   reposetup() for $TESTTMP/reposetup-test/src
   reposetup() for $TESTTMP/reposetup-test/clone-dst3
   $ hg init push-dst3
   reposetup() for $TESTTMP/reposetup-test/push-dst3
   $ hg -q -R src push push-dst3
   reposetup() for $TESTTMP/reposetup-test/src
   reposetup() for $TESTTMP/reposetup-test/push-dst3
   $ hg init pull-src3
   reposetup() for $TESTTMP/reposetup-test/pull-src3
   $ hg -q -R pull-src3 pull src
   reposetup() for $TESTTMP/reposetup-test/pull-src3
   reposetup() for $TESTTMP/reposetup-test/src
 
   $ echo '[extensions]' >> src/.hg/hgrc
   $ echo '# disable extension locally' >> src/.hg/hgrc
   $ echo 'reposetuptest = !' >> src/.hg/hgrc
   $ hg clone -U src clone-dst4
   reposetup() for $TESTTMP/reposetup-test/clone-dst4
   $ hg init push-dst4
   reposetup() for $TESTTMP/reposetup-test/push-dst4
   $ hg -q -R src push push-dst4
   reposetup() for $TESTTMP/reposetup-test/push-dst4
   $ hg init pull-src4
   reposetup() for $TESTTMP/reposetup-test/pull-src4
   $ hg -q -R pull-src4 pull src
   reposetup() for $TESTTMP/reposetup-test/pull-src4
 
 disabling in command line overlays with all configuration
   $ hg --config extensions.reposetuptest=! clone -U src clone-dst5
   $ hg --config extensions.reposetuptest=! init push-dst5
   $ hg --config extensions.reposetuptest=! -q -R src push push-dst5
   $ hg --config extensions.reposetuptest=! init pull-src5
   $ hg --config extensions.reposetuptest=! -q -R pull-src5 pull src
 
   $ cat <<EOF >> $HGRCPATH
   > [extensions]
   > # disable extension globally and explicitly
   > reposetuptest = !
   > EOF
   $ hg init parent
   $ hg init parent/sub1
   $ echo 1 > parent/sub1/1
   $ hg -R parent/sub1 commit -Am '#0 at parent/sub1'
   adding 1
   $ hg init parent/sub2
   $ hg init parent/sub2/sub21
   $ echo 21 > parent/sub2/sub21/21
   $ hg -R parent/sub2/sub21 commit -Am '#0 at parent/sub2/sub21'
   adding 21
   $ cat > parent/sub2/.hgsub <<EOF
   > sub21 = sub21
   > EOF
   $ hg -R parent/sub2 commit -Am '#0 at parent/sub2'
   adding .hgsub
   $ hg init parent/sub3
   $ echo 3 > parent/sub3/3
   $ hg -R parent/sub3 commit -Am '#0 at parent/sub3'
   adding 3
   $ cat > parent/.hgsub <<EOF
   > sub1 = sub1
   > sub2 = sub2
   > sub3 = sub3
   > EOF
   $ hg -R parent commit -Am '#0 at parent'
   adding .hgsub
   $ echo '[extensions]' >> parent/.hg/hgrc
   $ echo '# enable extension locally' >> parent/.hg/hgrc
   $ echo "reposetuptest = $TESTTMP/reposetuptest.py" >> parent/.hg/hgrc
   $ cp parent/.hg/hgrc parent/sub2/.hg/hgrc
   $ hg -R parent status -S -A
   reposetup() for $TESTTMP/reposetup-test/parent
   reposetup() for $TESTTMP/reposetup-test/parent/sub2
   C .hgsub
   C .hgsubstate
   C sub1/1
   C sub2/.hgsub
   C sub2/.hgsubstate
   C sub2/sub21/21
   C sub3/3
 
   $ cd ..
 
 Prohibit registration of commands that don't use @command (issue5137)
 
   $ hg init deprecated
   $ cd deprecated
 
   $ cat <<EOF > deprecatedcmd.py
   > def deprecatedcmd(repo, ui):
   >     pass
   > cmdtable = {
   >     b'deprecatedcmd': (deprecatedcmd, [], b''),
   > }
   > EOF
   $ cat <<EOF > .hg/hgrc
   > [extensions]
   > deprecatedcmd = `pwd`/deprecatedcmd.py
   > mq = !
   > hgext.mq = !
   > hgext/mq = !
   > EOF
 
   $ hg deprecatedcmd > /dev/null
   *** failed to import extension deprecatedcmd from $TESTTMP/deprecated/deprecatedcmd.py: missing attributes: norepo, optionalrepo, inferrepo
   *** (use @command decorator to register 'deprecatedcmd')
   hg: unknown command 'deprecatedcmd'
   [255]
 
  the extension shouldn't be loaded at all so the mq works:
 
   $ hg qseries --config extensions.mq= > /dev/null
   *** failed to import extension deprecatedcmd from $TESTTMP/deprecated/deprecatedcmd.py: missing attributes: norepo, optionalrepo, inferrepo
   *** (use @command decorator to register 'deprecatedcmd')
 
   $ cd ..
 
 Test synopsis and docstring extending
 
   $ hg init exthelp
   $ cat > exthelp.py <<EOF
   > from mercurial import commands, extensions
   > def exbookmarks(orig, *args, **opts):
   >     return orig(*args, **opts)
   > def uisetup(ui):
   >     synopsis = ' GREPME [--foo] [-x]'
   >     docstring = '''
   >     GREPME make sure that this is in the help!
   >     '''
   >     extensions.wrapcommand(commands.table, b'bookmarks', exbookmarks,
   >                            synopsis, docstring)
   > EOF
   $ abspath=`pwd`/exthelp.py
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "exthelp = $abspath" >> $HGRCPATH
   $ cd exthelp
   $ hg help bookmarks | grep GREPME
   hg bookmarks [OPTIONS]... [NAME]... GREPME [--foo] [-x]
       GREPME make sure that this is in the help!
   $ cd ..
 
 Show deprecation warning for the use of cmdutil.command
 
   $ cat > nonregistrar.py <<EOF
   > from mercurial import cmdutil
   > cmdtable = {}
   > command = cmdutil.command(cmdtable)
   > @command(b'foo', [], norepo=True)
   > def foo(ui):
   >     pass
   > EOF
 
   $ hg --config extensions.nonregistrar=`pwd`/nonregistrar.py version > /dev/null
   devel-warn: cmdutil.command is deprecated, use registrar.command to register 'foo'
   (compatibility will be dropped after Mercurial-4.6, update your code.) * (glob)
 
 Prohibit the use of unicode strings as the default value of options
 
   $ hg init $TESTTMP/opt-unicode-default
 
   $ cat > $TESTTMP/test_unicode_default_value.py << EOF
   > from mercurial import registrar
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > @command(b'dummy', [('', 'opt', u'value', u'help')], 'ext [OPTIONS]')
   > def ext(*args, **opts):
   >     print(opts['opt'])
   > EOF
   $ cat > $TESTTMP/opt-unicode-default/.hg/hgrc << EOF
   > [extensions]
   > test_unicode_default_value = $TESTTMP/test_unicode_default_value.py
   > EOF
   $ hg -R $TESTTMP/opt-unicode-default dummy
   *** failed to import extension test_unicode_default_value from $TESTTMP/test_unicode_default_value.py: unicode u'value' found in cmdtable.dummy
   *** (use b'' to make it byte string)
   hg: unknown command 'dummy'
   (did you mean summary?)
   [255]