extdiff: fix crash when showing diff from wdir()

Differential Revision: https://phab.mercurial-scm.org/D9623

hgext/extdiff.py

@@ -1,795 +1,795 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
 
 If a program has a graphical interface, it might be interesting to tell
 Mercurial about it. It will prevent the program from being mistakenly
 used in a terminal-only environment (such as an SSH terminal session),
 and will make :hg:`extdiff --per-file` open multiple file diffs at once
 instead of one by one (if you still want to open file diffs one by one,
 you can use the --confirm option).
 
 Declaring that a tool has a graphical interface can be done with the
 ``gui`` flag next to where ``diffargs`` are specified:
 
 ::
 
   [diff-tools]
   kdiff3.diffargs=--L1 '$plabel1' --L2 '$clabel' $parent $child
   kdiff3.gui = true
 
 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 subprocess
 
 from mercurial.i18n import _
 from mercurial.node import (
     nullid,
     short,
 )
 from mercurial import (
     archival,
     cmdutil,
     encoding,
     error,
     filemerge,
     formatter,
     pycompat,
     registrar,
     scmutil,
     util,
 )
 from mercurial.utils import (
     procutil,
     stringutil,
 )
 
 cmdtable = {}
 command = registrar.command(cmdtable)
 
 configtable = {}
 configitem = registrar.configitem(configtable)
 
 configitem(
     b'extdiff',
     br'opts\..*',
     default=b'',
     generic=True,
 )
 
 configitem(
     b'extdiff',
     br'gui\..*',
     generic=True,
 )
 
 configitem(
     b'diff-tools',
     br'.*\.diffargs$',
     default=None,
     generic=True,
 )
 
 configitem(
     b'diff-tools',
     br'.*\.gui$',
     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 = b'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 == b"":
         dirname = b"root"
     if node is not None:
         dirname = b'%s.%s' % (dirname, short(node))
     base = os.path.join(tmproot, dirname)
     os.mkdir(base)
     fnsandstat = []
 
     if node is not None:
         ui.note(
             _(b'making snapshot of %d files from rev %s\n')
             % (len(files), short(node))
         )
     else:
         ui.note(
             _(b'making snapshot of %d files from working directory\n')
             % (len(files))
         )
 
     if files:
         repo.ui.setconfig(b"ui", b"archivemeta", False)
 
         archival.archive(
             repo,
             base,
             node,
             b'files',
             match=scmutil.matchfiles(repo, files),
             subrepos=listsubrepos,
         )
 
         for fn in sorted(files):
             wfn = util.pconvert(fn)
             ui.note(b'  %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 formatcmdline(
     cmdline,
     repo_root,
     do3way,
     parent1,
     plabel1,
     parent2,
     plabel2,
     child,
     clabel,
 ):
     # 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 = {
         b'parent': parent1,
         b'parent1': parent1,
         b'parent2': parent2,
         b'plabel1': plabel1,
         b'plabel2': plabel2,
         b'child': child,
         b'clabel': clabel,
         b'root': repo_root,
     }
 
     def quote(match):
         pre = match.group(2)
         key = match.group(3)
         if not do3way and key == b'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 += b' $parent1 $child'
     return re.sub(regex, quote, cmdline)
 
 
 def _systembackground(cmd, environ=None, cwd=None):
     """like 'procutil.system', but returns the Popen object directly
     so we don't have to wait on it.
     """
     env = procutil.shellenviron(environ)
     proc = subprocess.Popen(
         procutil.tonativestr(cmd),
         shell=True,
         close_fds=procutil.closefds,
         env=procutil.tonativeenv(env),
         cwd=pycompat.rapply(procutil.tonativestr, cwd),
     )
     return proc
 
 
 def _runperfilediff(
     cmdline,
     repo_root,
     ui,
     guitool,
     do3way,
     confirm,
     commonfiles,
     tmproot,
     dir1a,
     dir1b,
     dir2,
     rev1a,
     rev1b,
     rev2,
 ):
     # Note that we need to sort the list of files because it was
     # built in an "unstable" way and it's annoying to get files in a
     # random order, especially when "confirm" mode is enabled.
     waitprocs = []
     totalfiles = len(commonfiles)
     for idx, commonfile in enumerate(sorted(commonfiles)):
         path1a = os.path.join(dir1a, commonfile)
         label1a = commonfile + rev1a
         if not os.path.isfile(path1a):
             path1a = pycompat.osdevnull
 
         path1b = b''
         label1b = b''
         if do3way:
             path1b = os.path.join(dir1b, commonfile)
             label1b = commonfile + rev1b
             if not os.path.isfile(path1b):
                 path1b = pycompat.osdevnull
 
         path2 = os.path.join(dir2, commonfile)
         label2 = commonfile + rev2
 
         if confirm:
             # Prompt before showing this diff
             difffiles = _(b'diff %s (%d of %d)') % (
                 commonfile,
                 idx + 1,
                 totalfiles,
             )
             responses = _(
                 b'[Yns?]'
                 b'$$ &Yes, show diff'
                 b'$$ &No, skip this diff'
                 b'$$ &Skip remaining diffs'
                 b'$$ &? (display help)'
             )
             r = ui.promptchoice(b'%s %s' % (difffiles, responses))
             if r == 3:  # ?
                 while r == 3:
                     for c, t in ui.extractchoices(responses)[1]:
                         ui.write(b'%s - %s\n' % (c, encoding.lower(t)))
                     r = ui.promptchoice(b'%s %s' % (difffiles, responses))
             if r == 0:  # yes
                 pass
             elif r == 1:  # no
                 continue
             elif r == 2:  # skip
                 break
 
         curcmdline = formatcmdline(
             cmdline,
             repo_root,
             do3way=do3way,
             parent1=path1a,
             plabel1=label1a,
             parent2=path1b,
             plabel2=label1b,
             child=path2,
             clabel=label2,
         )
 
         if confirm or not guitool:
             # Run the comparison program and wait for it to exit
             # before we show the next file.
             # This is because either we need to wait for confirmation
             # from the user between each invocation, or because, as far
             # as we know, the tool doesn't have a GUI, in which case
             # we can't run multiple CLI programs at the same time.
             ui.debug(
                 b'running %r in %s\n' % (pycompat.bytestr(curcmdline), tmproot)
             )
             ui.system(curcmdline, cwd=tmproot, blockedtag=b'extdiff')
         else:
             # Run the comparison program but don't wait, as we're
             # going to rapid-fire each file diff and then wait on
             # the whole group.
             ui.debug(
                 b'running %r in %s (backgrounded)\n'
                 % (pycompat.bytestr(curcmdline), tmproot)
             )
             proc = _systembackground(curcmdline, cwd=tmproot)
             waitprocs.append(proc)
 
     if waitprocs:
         with ui.timeblockedsection(b'extdiff'):
             for proc in waitprocs:
                 proc.wait()
 
 
 def diffpatch(ui, repo, node1, node2, tmproot, matcher, cmdline):
     template = b'hg-%h.patch'
     # write patches to temporary files
     with formatter.nullformatter(ui, b'extdiff', {}) as fm:
         cmdutil.export(
             repo,
             [repo[node1].rev(), repo[node2].rev()],
             fm,
             fntemplate=repo.vfs.reljoin(tmproot, template),
             match=matcher,
         )
     label1 = cmdutil.makefilename(repo[node1], template)
     label2 = cmdutil.makefilename(repo[node2], template)
     file1 = repo.vfs.reljoin(tmproot, label1)
     file2 = repo.vfs.reljoin(tmproot, label2)
     cmdline = formatcmdline(
         cmdline,
         repo.root,
         # no 3way while comparing patches
         do3way=False,
         parent1=file1,
         plabel1=label1,
         # while comparing patches, there is no second parent
         parent2=None,
         plabel2=None,
         child=file2,
         clabel=label2,
     )
     ui.debug(b'running %r in %s\n' % (pycompat.bytestr(cmdline), tmproot))
     ui.system(cmdline, cwd=tmproot, blockedtag=b'extdiff')
     return 1
 
 
 def diffrevs(
     ui,
     repo,
     ctx1a,
     ctx1b,
     ctx2,
     matcher,
     tmproot,
     cmdline,
     do3way,
     guitool,
     opts,
 ):
 
     subrepos = opts.get(b'subrepos')
 
     # calculate list of files changed between both revs
     st = ctx1a.status(ctx2, matcher, listsubrepos=subrepos)
     mod_a, add_a, rem_a = set(st.modified), set(st.added), set(st.removed)
     if do3way:
         stb = ctx1b.status(ctx2, matcher, listsubrepos=subrepos)
         mod_b, add_b, rem_b = (
             set(stb.modified),
             set(stb.added),
             set(stb.removed),
         )
     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
 
     # Always make a copy of ctx1a (and ctx1b, if applicable)
     # dir1a should contain files which are:
     #   * modified or removed from ctx1a to ctx2
     #   * modified or added from ctx1b to ctx2
     #     (except file added from ctx1a to ctx2 as they were not present in
     #     ctx1a)
     dir1a_files = mod_a | rem_a | ((mod_b | add_b) - add_a)
     dir1a = snapshot(ui, repo, dir1a_files, ctx1a.node(), tmproot, subrepos)[0]
-    rev1a = b'@%d' % ctx1a.rev()
+    rev1a = b'' if ctx1a.rev() is None else b'@%d' % ctx1a.rev()
     if do3way:
         # file calculation criteria same as dir1a
         dir1b_files = mod_b | rem_b | ((mod_a | add_a) - add_b)
         dir1b = snapshot(
             ui, repo, dir1b_files, ctx1b.node(), tmproot, subrepos
         )[0]
         rev1b = b'@%d' % ctx1b.rev()
     else:
         dir1b = None
         rev1b = b''
 
     fnsandstat = []
 
     # If ctx2 is not the wc or there is >1 change, copy it
     dir2root = b''
     rev2 = b''
     if ctx2.node() is not None:
         dir2 = snapshot(ui, repo, modadd, ctx2.node(), tmproot, subrepos)[0]
         rev2 = b'@%d' % ctx2.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 = b''
         dir2root = repo.root
 
     label1a = rev1a
     label1b = rev1b
     label2 = rev2
 
     if not opts.get(b'per_file'):
         # 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 = pycompat.osdevnull
             if do3way:
                 dir1b = os.path.join(tmproot, dir1b, common_file)
                 label1b = common_file + rev1b
                 if not os.path.isfile(dir1b):
                     dir1b = pycompat.osdevnull
             dir2 = os.path.join(dir2root, dir2, common_file)
             label2 = common_file + rev2
 
         # Run the external tool on the 2 temp directories or the patches
         cmdline = formatcmdline(
             cmdline,
             repo.root,
             do3way=do3way,
             parent1=dir1a,
             plabel1=label1a,
             parent2=dir1b,
             plabel2=label1b,
             child=dir2,
             clabel=label2,
         )
         ui.debug(b'running %r in %s\n' % (pycompat.bytestr(cmdline), tmproot))
         ui.system(cmdline, cwd=tmproot, blockedtag=b'extdiff')
     else:
         # Run the external tool once for each pair of files
         _runperfilediff(
             cmdline,
             repo.root,
             ui,
             guitool=guitool,
             do3way=do3way,
             confirm=opts.get(b'confirm'),
             commonfiles=common,
             tmproot=tmproot,
             dir1a=os.path.join(tmproot, dir1a),
             dir1b=os.path.join(tmproot, dir1b) if do3way else None,
             dir2=os.path.join(dir2root, dir2),
             rev1a=rev1a,
             rev1b=rev1b,
             rev2=rev2,
         )
 
     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(
                 b'file changed while diffing. '
                 b'Overwriting: %s (src: %s)\n' % (working_fn, copy_fn)
             )
             util.copyfile(copy_fn, working_fn)
 
     return 1
 
 
 def dodiff(ui, repo, cmdline, pats, opts, guitool=False):
     """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
     """
 
     cmdutil.check_at_most_one_arg(opts, b'rev', b'change')
     revs = opts.get(b'rev')
     change = opts.get(b'change')
     do3way = b'$parent2' in cmdline
 
     if change:
         ctx2 = scmutil.revsingle(repo, change, None)
         ctx1a, ctx1b = ctx2.p1(), ctx2.p2()
     else:
         ctx1a, ctx2 = scmutil.revpair(repo, revs)
         if not revs:
             ctx1b = repo[None].p2()
         else:
             ctx1b = repo[nullid]
 
     # Disable 3-way merge if there is only one parent
     if do3way:
         if ctx1b.node() == nullid:
             do3way = False
 
     matcher = scmutil.match(ctx2, pats, opts)
 
     if opts.get(b'patch'):
         if opts.get(b'subrepos'):
             raise error.Abort(_(b'--patch cannot be used with --subrepos'))
         if opts.get(b'per_file'):
             raise error.Abort(_(b'--patch cannot be used with --per-file'))
         if ctx2.node() is None:
             raise error.Abort(_(b'--patch requires two revisions'))
 
     tmproot = pycompat.mkdtemp(prefix=b'extdiff.')
     try:
         if opts.get(b'patch'):
             return diffpatch(
                 ui, repo, ctx1a.node(), ctx2.node(), tmproot, matcher, cmdline
             )
 
         return diffrevs(
             ui,
             repo,
             ctx1a,
             ctx1b,
             ctx2,
             matcher,
             tmproot,
             cmdline,
             do3way,
             guitool,
             opts,
         )
 
     finally:
         ui.note(_(b'cleaning up temp directory\n'))
         shutil.rmtree(tmproot)
 
 
 extdiffopts = (
     [
         (
             b'o',
             b'option',
             [],
             _(b'pass option to comparison program'),
             _(b'OPT'),
         ),
         (b'r', b'rev', [], _(b'revision'), _(b'REV')),
         (b'c', b'change', b'', _(b'change made by revision'), _(b'REV')),
         (
             b'',
             b'per-file',
             False,
             _(b'compare each file instead of revision snapshots'),
         ),
         (
             b'',
             b'confirm',
             False,
             _(b'prompt user before each external program invocation'),
         ),
         (b'', b'patch', None, _(b'compare patches for two revisions')),
     ]
     + cmdutil.walkopts
     + cmdutil.subrepoopts
 )
 
 
 @command(
     b'extdiff',
     [
         (b'p', b'program', b'', _(b'comparison program to run'), _(b'CMD')),
     ]
     + extdiffopts,
     _(b'hg extdiff [OPT]... [FILE]...'),
     helpcategory=command.CATEGORY_FILE_CONTENTS,
     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,
     unless the --per-file option is specified (see below). To pass
     additional options to the program, use -o/--option. These will be
     passed before the names of the directories or files 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.
 
     The --per-file option runs the external program repeatedly on each
     file to diff, instead of once on two directories. By default,
     this happens one by one, where the next file diff is open in the
     external program only once the previous external program (for the
     previous file diff) has exited. If the external program has a
     graphical interface, it can open all the file diffs at once instead
     of one by one. See :hg:`help -e extdiff` for information about how
     to tell Mercurial that a given program has a graphical interface.
 
     The --confirm option will prompt the user before each invocation of
     the external program. It is ignored if --per-file isn't specified.
     """
     opts = pycompat.byteskwargs(opts)
     program = opts.get(b'program')
     option = opts.get(b'option')
     if not program:
         program = b'diff'
         option = option or [b'-Npru']
     cmdline = b' '.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, isgui):
         # We can't pass non-ASCII through docstrings (and path is
         # in an unknown encoding anyway), but avoid double separators on
         # Windows
         docpath = stringutil.escapestr(path).replace(b'\\\\', b'\\')
         self.__doc__ %= {'path': pycompat.sysstr(stringutil.uirepr(docpath))}
         self._cmdline = cmdline
         self._isgui = isgui
 
     def __call__(self, ui, repo, *pats, **opts):
         opts = pycompat.byteskwargs(opts)
         options = b' '.join(map(procutil.shellquote, opts[b'option']))
         if options:
             options = b' ' + options
         return dodiff(
             ui, repo, self._cmdline + options, pats, opts, guitool=self._isgui
         )
 
 
 def _gettooldetails(ui, cmd, path):
     """
     returns following things for a
     ```
     [extdiff]
     <cmd> = <path>
     ```
     entry:
 
     cmd: command/tool name
     path: path to the tool
     cmdline: the command which should be run
     isgui: whether the tool uses GUI or not
 
     Reads all external tools related configs, whether it be extdiff section,
     diff-tools or merge-tools section, or its specified in an old format or
     the latest format.
     """
     path = util.expandpath(path)
     if cmd.startswith(b'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(b'extdiff', b'opts.' + cmd)
         cmdline = procutil.shellquote(path)
         if diffopts:
             cmdline += b' ' + diffopts
         isgui = ui.configbool(b'extdiff', b'gui.' + cmd)
     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
         isgui = ui.configbool(b'extdiff', b'gui.' + cmd)
     # look for diff arguments in [diff-tools] then [merge-tools]
     if not diffopts:
         key = cmd + b'.diffargs'
         for section in (b'diff-tools', b'merge-tools'):
             args = ui.config(section, key)
             if args:
                 cmdline += b' ' + args
                 if isgui is None:
                     isgui = ui.configbool(section, cmd + b'.gui') or False
                 break
     return cmd, path, cmdline, isgui
 
 
 def uisetup(ui):
     for cmd, path in ui.configitems(b'extdiff'):
         if cmd.startswith(b'opts.') or cmd.startswith(b'gui.'):
             continue
         cmd, path, cmdline, isgui = _gettooldetails(ui, cmd, path)
         command(
             cmd,
             extdiffopts[:],
             _(b'hg %s [OPTION]... [FILE]...') % cmd,
             helpcategory=command.CATEGORY_FILE_CONTENTS,
             inferrepo=True,
         )(savedcmd(path, cmdline, isgui))
 
 
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = [savedcmd]

tests/test-extdiff.t

@@ -1,545 +1,554 b''
   $ echo "[extensions]" >> $HGRCPATH
   $ echo "extdiff=" >> $HGRCPATH
 
   $ hg init a
   $ cd a
   $ echo a > a
   $ echo b > b
   $ hg add
   adding a
   adding b
 
 Should diff cloned directories:
 
   $ hg extdiff -o -r
   Only in a: a
   Only in a: b
   [1]
 
   $ cat <<EOF >> $HGRCPATH
   > [extdiff]
   > cmd.falabala = echo
   > opts.falabala = diffing
   > cmd.edspace = echo
   > opts.edspace = "name  <[e-mail]>"
   > alabalaf =
   > [merge-tools]
   > alabalaf.executable = echo
   > alabalaf.diffargs = diffing
   > EOF
 
   $ hg falabala
   diffing a.000000000000 a
   [1]
 
   $ hg help falabala
   hg falabala [OPTION]... [FILE]...
   
   use external program to diff repository (or selected files)
   
       Show differences between revisions for the specified files, using the
       following program:
   
         'echo'
   
       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.
   
   options ([+] can be repeated):
   
    -o --option OPT [+]      pass option to comparison program
    -r --rev REV [+]         revision
    -c --change REV          change made by revision
       --per-file            compare each file instead of revision snapshots
       --confirm             prompt user before each external program invocation
       --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 ci -d '0 0' -mtest1
 
   $ echo b >> a
   $ hg ci -d '1 0' -mtest2
 
 Should diff cloned files directly:
 
   $ hg falabala -r 0:1
   diffing "*\\extdiff.*\\a.8a5febb7f867\\a" "a.34eed99112ab\\a" (glob) (windows !)
   diffing */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob) (no-windows !)
   [1]
 
+Can show diff from working copy:
+  $ echo c >> a
+  $ hg falabala -r 'wdir()' -r 1
+  diffing "*\\extdiff.*\\a" "a.34eed99112ab\\a" (glob) (windows !)
+  diffing */extdiff.*/a a.34eed99112ab/a (glob) (no-windows !)
+  [1]
+  $ hg revert a
+  $ rm a.orig
+
 Specifying an empty revision should abort.
 
   $ hg extdiff -p diff --patch --rev 'ancestor()' --rev 1
   abort: empty revision on one side of range
   [255]
 
 Test diff during merge:
 
   $ hg update -C 0
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ echo c >> c
   $ hg add c
   $ hg ci -m "new branch" -d '1 0'
   created new head
   $ hg merge 1
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
 
 Should diff cloned file against wc file:
 
   $ hg falabala
   diffing "*\\extdiff.*\\a.2a13a4d2da36\\a" "*\\a\\a" (glob) (windows !)
   diffing */extdiff.*/a.2a13a4d2da36/a */a/a (glob) (no-windows !)
   [1]
 
 
 Test --change option:
 
   $ hg ci -d '2 0' -mtest3
 
   $ hg falabala -c 1
   diffing "*\\extdiff.*\\a.8a5febb7f867\\a" "a.34eed99112ab\\a" (glob) (windows !)
   diffing */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob) (no-windows !)
   [1]
 
 Check diff are made from the first parent:
 
   $ hg falabala -c 3 || echo "diff-like tools yield a non-zero exit code"
   diffing "*\\extdiff.*\\a.2a13a4d2da36\\a" "a.46c0e4daeb72\\a" (glob) (windows !)
   diffing */extdiff.*/a.2a13a4d2da36/a a.46c0e4daeb72/a (glob) (no-windows !)
   diff-like tools yield a non-zero exit code
 
 issue3153: ensure using extdiff with removed subrepos doesn't crash:
 
   $ hg init suba
   $ cd suba
   $ echo suba > suba
   $ hg add
   adding suba
   $ hg ci -m "adding suba file"
   $ cd ..
   $ echo suba=suba > .hgsub
   $ hg add
   adding .hgsub
   $ hg ci -Sm "adding subrepo"
   $ echo > .hgsub
   $ hg ci -m "removing subrepo"
   $ hg falabala -r 4 -r 5 -S
   diffing a.398e36faf9c6 a.5ab95fb166c4
   [1]
 
 Test --per-file option:
 
   $ hg up -q -C 3
   $ echo a2 > a
   $ echo b2 > b
   $ hg ci -d '3 0' -mtestmode1
   created new head
   $ hg falabala -c 6 --per-file
   diffing "*\\extdiff.*\\a.46c0e4daeb72\\a" "a.81906f2b98ac\\a" (glob) (windows !)
   diffing */extdiff.*/a.46c0e4daeb72/a a.81906f2b98ac/a (glob) (no-windows !)
   diffing "*\\extdiff.*\\a.46c0e4daeb72\\b" "a.81906f2b98ac\\b" (glob) (windows !)
   diffing */extdiff.*/a.46c0e4daeb72/b a.81906f2b98ac/b (glob) (no-windows !)
   [1]
 
 Test --per-file option for gui tool:
 
   $ hg --config extdiff.gui.alabalaf=True alabalaf -c 6 --per-file --debug
   diffing */extdiff.*/a.46c0e4daeb72/* a.81906f2b98ac/* (glob)
   diffing */extdiff.*/a.46c0e4daeb72/* a.81906f2b98ac/* (glob)
   making snapshot of 2 files from rev 46c0e4daeb72
     a
     b
   making snapshot of 2 files from rev 81906f2b98ac
     a
     b
   running '* diffing * *' in * (backgrounded) (glob)
   running '* diffing * *' in * (backgrounded) (glob)
   cleaning up temp directory
   [1]
 
 Test --per-file option for gui tool again:
 
   $ hg --config merge-tools.alabalaf.gui=True alabalaf -c 6 --per-file --debug
   diffing */extdiff.*/a.46c0e4daeb72/* a.81906f2b98ac/* (glob)
   diffing */extdiff.*/a.46c0e4daeb72/* a.81906f2b98ac/* (glob)
   making snapshot of 2 files from rev 46c0e4daeb72
     a
     b
   making snapshot of 2 files from rev 81906f2b98ac
     a
     b
   running '* diffing * *' in * (backgrounded) (glob)
   running '* diffing * *' in * (backgrounded) (glob)
   cleaning up temp directory
   [1]
 
 Test --per-file and --confirm options:
 
   $ hg --config ui.interactive=True falabala -c 6 --per-file --confirm <<EOF
   > n
   > y
   > EOF
   diff a (1 of 2) [Yns?] n
   diff b (2 of 2) [Yns?] y
   diffing "*\\extdiff.*\\a.46c0e4daeb72\\b" "a.81906f2b98ac\\b" (glob) (windows !)
   diffing */extdiff.*/a.46c0e4daeb72/b a.81906f2b98ac/b (glob) (no-windows !)
   [1]
 
 Test --per-file and --confirm options with skipping:
 
   $ hg --config ui.interactive=True falabala -c 6 --per-file --confirm <<EOF
   > s
   > EOF
   diff a (1 of 2) [Yns?] s
   [1]
 
 issue4463: usage of command line configuration without additional quoting
 
   $ cat <<EOF >> $HGRCPATH
   > [extdiff]
   > cmd.4463a = echo
   > opts.4463a = a-naked 'single quoted' "double quoted"
   > 4463b = echo b-naked 'single quoted' "double quoted"
   > echo =
   > EOF
   $ hg update -q -C 0
   $ echo a >> a
 
   $ hg --debug 4463a | grep '^running'
   running 'echo a-naked \'single quoted\' "double quoted" "*\\a" "*\\a"' in */extdiff.* (glob) (windows !)
   running 'echo a-naked \'single quoted\' "double quoted" */a $TESTTMP/a/a' in */extdiff.* (glob) (no-windows !)
   $ hg --debug 4463b | grep '^running'
   running 'echo b-naked \'single quoted\' "double quoted" "*\\a" "*\\a"' in */extdiff.* (glob) (windows !)
   running 'echo b-naked \'single quoted\' "double quoted" */a $TESTTMP/a/a' in */extdiff.* (glob) (no-windows !)
   $ hg --debug echo | grep '^running'
   running '*echo* "*\\a" "*\\a"' in */extdiff.* (glob) (windows !)
   running '*echo */a $TESTTMP/a/a' in */extdiff.* (glob) (no-windows !)
 
 (getting options from other than extdiff section)
 
   $ cat <<EOF >> $HGRCPATH
   > [extdiff]
   > # using diff-tools diffargs
   > 4463b2 = echo
   > # using merge-tools diffargs
   > 4463b3 = echo
   > # no diffargs
   > 4463b4 = echo
   > [diff-tools]
   > 4463b2.diffargs = b2-naked 'single quoted' "double quoted"
   > [merge-tools]
   > 4463b3.diffargs = b3-naked 'single quoted' "double quoted"
   > EOF
 
   $ hg --debug 4463b2 | grep '^running'
   running 'echo b2-naked \'single quoted\' "double quoted" "*\\a" "*\\a"' in */extdiff.* (glob) (windows !)
   running 'echo b2-naked \'single quoted\' "double quoted" */a $TESTTMP/a/a' in */extdiff.* (glob) (no-windows !)
   $ hg --debug 4463b3 | grep '^running'
   running 'echo b3-naked \'single quoted\' "double quoted" "*\\a" "*\\a"' in */extdiff.* (glob) (windows !)
   running 'echo b3-naked \'single quoted\' "double quoted" */a $TESTTMP/a/a' in */extdiff.* (glob) (no-windows !)
   $ hg --debug 4463b4 | grep '^running'
   running 'echo "*\\a" "*\\a"' in */extdiff.* (glob) (windows !)
   running 'echo */a $TESTTMP/a/a' in */extdiff.* (glob) (no-windows !)
   $ hg --debug 4463b4 --option b4-naked --option 'being quoted' | grep '^running'
   running 'echo b4-naked "being quoted" "*\\a" "*\\a"' in */extdiff.* (glob) (windows !)
   running "echo b4-naked 'being quoted' */a $TESTTMP/a/a" in */extdiff.* (glob) (no-windows !)
   $ hg --debug extdiff -p echo --option echo-naked --option 'being quoted' | grep '^running'
   running 'echo echo-naked "being quoted" "*\\a" "*\\a"' in */extdiff.* (glob) (windows !)
   running "echo echo-naked 'being quoted' */a $TESTTMP/a/a" in */extdiff.* (glob) (no-windows !)
 
   $ touch 'sp ace'
   $ hg add 'sp ace'
   $ hg ci -m 'sp ace'
   created new head
   $ echo > 'sp ace'
 
 Test pre-72a89cf86fcd backward compatibility with half-baked manual quoting
 
   $ cat <<EOF >> $HGRCPATH
   > [extdiff]
   > odd =
   > [merge-tools]
   > odd.diffargs = --foo='\$clabel' '\$clabel' "--bar=\$clabel" "\$clabel"
   > odd.executable = echo
   > EOF
 
   $ hg --debug odd | grep '^running'
   running '"*\\echo.exe" --foo="sp ace" "sp ace" --bar="sp ace" "sp ace"' in * (glob) (windows !)
   running "*/echo --foo='sp ace' 'sp ace' --bar='sp ace' 'sp ace'" in * (glob) (no-windows !)
 
 Empty argument must be quoted
 
   $ cat <<EOF >> $HGRCPATH
   > [extdiff]
   > kdiff3 = echo
   > [merge-tools]
   > kdiff3.diffargs=--L1 \$plabel1 --L2 \$clabel \$parent \$child
   > EOF
 
   $ hg --debug kdiff3 -r0 | grep '^running'
   running 'echo --L1 "@0" --L2 "" a.8a5febb7f867 a' in * (glob) (windows !)
   running "echo --L1 '@0' --L2 '' a.8a5febb7f867 a" in * (glob) (no-windows !)
 
 
 Test extdiff of multiple files in tmp dir:
 
   $ hg update -C 0 > /dev/null
   $ echo changed > a
   $ echo changed > b
 #if execbit
   $ chmod +x b
 #endif
 
 Diff in working directory, before:
 
   $ hg diff --git
   diff --git a/a b/a
   --- a/a
   +++ b/a
   @@ -1,1 +1,1 @@
   -a
   +changed
   diff --git a/b b/b
   old mode 100644 (execbit !)
   new mode 100755 (execbit !)
   --- a/b
   +++ b/b
   @@ -1,1 +1,1 @@
   -b
   +changed
 
 
 Edit with extdiff -p:
 
 Prepare custom diff/edit tool:
 
   $ cat > 'diff tool.py' << EOT
   > #!$PYTHON
   > import time
   > time.sleep(1) # avoid unchanged-timestamp problems
   > open('a/a', 'ab').write(b'edited\n')
   > open('a/b', 'ab').write(b'edited\n')
   > EOT
 
 #if execbit
   $ chmod +x 'diff tool.py'
 #endif
 
 will change to /tmp/extdiff.TMP and populate directories a.TMP and a
 and start tool
 
 #if windows
   $ cat > 'diff tool.bat' << EOF
   > @"$PYTHON" "`pwd`/diff tool.py"
   > EOF
   $ hg extdiff -p "`pwd`/diff tool.bat"
   [1]
 #else
   $ hg extdiff -p "`pwd`/diff tool.py"
   [1]
 #endif
 
 Diff in working directory, after:
 
   $ hg diff --git
   diff --git a/a b/a
   --- a/a
   +++ b/a
   @@ -1,1 +1,2 @@
   -a
   +changed
   +edited
   diff --git a/b b/b
   old mode 100644 (execbit !)
   new mode 100755 (execbit !)
   --- a/b
   +++ b/b
   @@ -1,1 +1,2 @@
   -b
   +changed
   +edited
 
 Test extdiff with --option:
 
   $ hg extdiff -p echo -o this -c 1
   this "*\\a.8a5febb7f867\\a" "a.34eed99112ab\\a" (glob) (windows !)
   this */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob) (no-windows !)
   [1]
 
   $ hg falabala -o this -c 1
   diffing this "*\\a.8a5febb7f867\\a" "a.34eed99112ab\\a" (glob) (windows !)
   diffing this */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob) (no-windows !)
   [1]
 
 Test extdiff's handling of options with spaces in them:
 
   $ hg edspace -c 1
   "name  <[e-mail]>" "*\\a.8a5febb7f867\\a" "a.34eed99112ab\\a" (glob) (windows !)
   name  <[e-mail]> */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob) (no-windows !)
   [1]
 
   $ hg extdiff -p echo -o "name  <[e-mail]>" -c 1
   "name  <[e-mail]>" "*\\a.8a5febb7f867\\a" "a.34eed99112ab\\a" (glob) (windows !)
   name  <[e-mail]> */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob) (no-windows !)
   [1]
 
 Test with revsets:
 
   $ hg extdif -p echo -c "rev(1)"
   "*\\a.8a5febb7f867\\a" "a.34eed99112ab\\a" (glob) (windows !)
   */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob) (no-windows !)
   [1]
 
   $ hg extdif -p echo -r "0::1"
   "*\\a.8a5febb7f867\\a" "a.34eed99112ab\\a" (glob) (windows !)
   */extdiff.*/a.8a5febb7f867/a a.34eed99112ab/a (glob) (no-windows !)
   [1]
 
 Fallback to merge-tools.tool.executable|regkey
   $ mkdir dir
   $ cat > 'dir/tool.sh' << 'EOF'
   > #!/bin/sh
   > # Mimic a tool that syncs all attrs, including mtime
   > cp $1/a $2/a
   > touch -r $1/a $2/a
   > chmod +x $2/a
   > echo "** custom diff **"
   > EOF
 #if execbit
   $ chmod +x dir/tool.sh
 #endif
 
 Windows can't run *.sh directly, so create a shim executable that can be.
 Without something executable, the next hg command will try to run `tl` instead
 of $tool (and fail).
 #if windows
   $ cat > dir/tool.bat <<EOF
   > @sh -c "`pwd`/dir/tool.sh %1 %2"
   > EOF
   $ tool=`pwd`/dir/tool.bat
 #else
   $ tool=`pwd`/dir/tool.sh
 #endif
 
   $ cat a
   changed
   edited
   $ hg --debug tl --config extdiff.tl= --config merge-tools.tl.executable=$tool
   making snapshot of 2 files from rev * (glob)
     a
     b
   making snapshot of 2 files from working directory
     a
     b
   running '$TESTTMP/a/dir/tool.bat a.* a' in */extdiff.* (glob) (windows !)
   running '$TESTTMP/a/dir/tool.sh a.* a' in */extdiff.* (glob) (no-windows !)
   ** custom diff **
   file changed while diffing. Overwriting: $TESTTMP/a/a (src: */extdiff.*/a/a) (glob)
   cleaning up temp directory
   [1]
   $ cat a
   a
 
 #if execbit
   $ [ -x a ]
 
   $ cat > 'dir/tool.sh' << 'EOF'
   > #!/bin/sh
   > chmod -x $2/a
   > echo "** custom diff **"
   > EOF
 
   $ hg --debug tl --config extdiff.tl= --config merge-tools.tl.executable=$tool
   making snapshot of 2 files from rev * (glob)
     a
     b
   making snapshot of 2 files from working directory
     a
     b
   running '$TESTTMP/a/dir/tool.sh a.* a' in */extdiff.* (glob)
   ** custom diff **
   file changed while diffing. Overwriting: $TESTTMP/a/a (src: */extdiff.*/a/a) (glob)
   cleaning up temp directory
   [1]
 
   $ [ -x a ]
   [1]
 #endif
 
   $ cd ..
 
 #if symlink
 
 Test symlinks handling (issue1909)
 
   $ hg init testsymlinks
   $ cd testsymlinks
   $ echo a > a
   $ hg ci -Am adda
   adding a
   $ echo a >> a
   $ ln -s missing linka
   $ hg add linka
   $ hg falabala -r 0 --traceback
   diffing testsymlinks.07f494440405 testsymlinks
   [1]
   $ cd ..
 
 #endif
 
 Test handling of non-ASCII paths in generated docstrings (issue5301)
 
   >>> with open("u", "wb") as f:
   ...     n = f.write(b"\xa5\xa5")
   $ U=`cat u`
 
   $ HGPLAIN=1 hg --config hgext.extdiff= --config extdiff.cmd.td=hi help -k xyzzy
   abort: no matches
   (try 'hg help' for a list of topics)
   [255]
 
   $ HGPLAIN=1 hg --config hgext.extdiff= --config extdiff.cmd.td=hi help td > /dev/null
 
   $ LC_MESSAGES=ja_JP.UTF-8 hg --config hgext.extdiff= --config extdiff.cmd.td=$U help -k xyzzy
   abort: no matches
   (try 'hg help' for a list of topics)
   [255]
 
   $ LC_MESSAGES=ja_JP.UTF-8 hg --config hgext.extdiff= --config extdiff.cmd.td=$U help td \
   > | grep "^      '"
         '\xa5\xa5'
 
   $ cd $TESTTMP
 
 Test that diffing a single file works, even if that file is new
 
   $ hg init testsinglefile
   $ cd testsinglefile
   $ echo a > a
   $ hg add a
   $ hg falabala
   diffing nul "*\\a" (glob) (windows !)
   diffing /dev/null */a (glob) (no-windows !)
   [1]
   $ hg ci -qm a
   $ hg falabala -c .
   diffing nul "*\\a" (glob) (windows !)
   diffing /dev/null */a (glob) (no-windows !)
   [1]
   $ echo a >> a
   $ hg falabala
   diffing "*\\a" "*\\a" (glob) (windows !)
   diffing */a */a (glob) (no-windows !)
   [1]
   $ hg ci -qm 2a
   $ hg falabala -c .
   diffing "*\\a" "*\\a" (glob) (windows !)
   diffing */a */a (glob) (no-windows !)
   [1]