hgext/extdiff.py
author Patrick Mezard <pmezard@gmail.com>
Wed, 03 Oct 2007 21:08:37 +0200
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child 6103 e668fd796b8b
permissions -rw-r--r--
Merge with crew-stable
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# extdiff.py - external diff program support for mercurial
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#
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# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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'''
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The `extdiff' Mercurial extension allows you to use external programs
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to compare revisions, or revision with working dir.  The external diff
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programs are called with a configurable set of options and two
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non-option arguments: paths to directories containing snapshots of
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files to compare.
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To enable this extension:
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  [extensions]
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  hgext.extdiff =
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The `extdiff' extension also allows to configure new diff commands, so
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you do not need to type "hg extdiff -p kdiff3" always.
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  [extdiff]
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  # add new command that runs GNU diff(1) in 'context diff' mode
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  cdiff = gdiff -Nprc5
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  ## or the old way:
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  #cmd.cdiff = gdiff
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  #opts.cdiff = -Nprc5
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  # add new command called vdiff, runs kdiff3
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  vdiff = kdiff3
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  # add new command called meld, runs meld (no need to name twice)
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  meld =
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  # add new command called vimdiff, runs gvimdiff with DirDiff plugin
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  #(see http://www.vim.org/scripts/script.php?script_id=102)
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  # Non english user, be sure to put "let g:DirDiffDynamicDiffText = 1" in
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  # your .vimrc
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  vimdiff = gvim -f '+next' '+execute "DirDiff" argv(0) argv(1)'
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You can use -I/-X and list of file or directory names like normal
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"hg diff" command.  The `extdiff' extension makes snapshots of only
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needed files, so running the external diff program will actually be
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pretty fast (at least faster than having to compare the entire tree).
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'''
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from mercurial.i18n import _
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from mercurial.node import *
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from mercurial import cmdutil, util, commands
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import os, shlex, shutil, tempfile
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def snapshot_node(ui, repo, files, node, tmproot):
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    '''snapshot files as of some revision'''
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    mf = repo.changectx(node).manifest()
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    dirname = os.path.basename(repo.root)
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    if dirname == "":
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        dirname = "root"
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    dirname = '%s.%s' % (dirname, short(node))
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    base = os.path.join(tmproot, dirname)
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    os.mkdir(base)
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    ui.note(_('making snapshot of %d files from rev %s\n') %
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            (len(files), short(node)))
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    for fn in files:
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        if not fn in mf:
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            # skipping new file after a merge ?
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            continue
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        wfn = util.pconvert(fn)
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        ui.note('  %s\n' % wfn)
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        dest = os.path.join(base, wfn)
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        destdir = os.path.dirname(dest)
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        if not os.path.isdir(destdir):
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            os.makedirs(destdir)
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        data = repo.wwritedata(wfn, repo.file(wfn).read(mf[wfn]))
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        open(dest, 'wb').write(data)
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    return dirname
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def snapshot_wdir(ui, repo, files, tmproot):
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    '''snapshot files from working directory.
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    if not using snapshot, -I/-X does not work and recursive diff
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    in tools like kdiff3 and meld displays too many files.'''
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    dirname = os.path.basename(repo.root)
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    if dirname == "":
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        dirname = "root"
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    base = os.path.join(tmproot, dirname)
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    os.mkdir(base)
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    ui.note(_('making snapshot of %d files from working dir\n') %
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            (len(files)))
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    for fn in files:
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        wfn = util.pconvert(fn)
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        ui.note('  %s\n' % wfn)
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        dest = os.path.join(base, wfn)
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        destdir = os.path.dirname(dest)
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        if not os.path.isdir(destdir):
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            os.makedirs(destdir)
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        fp = open(dest, 'wb')
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        for chunk in util.filechunkiter(repo.wopener(wfn)):
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            fp.write(chunk)
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    return dirname
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def dodiff(ui, repo, diffcmd, diffopts, pats, opts):
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    node1, node2 = cmdutil.revpair(repo, opts['rev'])
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    files, matchfn, anypats = cmdutil.matchpats(repo, pats, opts)
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    modified, added, removed, deleted, unknown = repo.status(
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        node1, node2, files, match=matchfn)[:5]
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    if not (modified or added or removed):
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        return 0
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    tmproot = tempfile.mkdtemp(prefix='extdiff.')
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    dir2root = ''
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    try:
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        # Always make a copy of node1
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        dir1 = snapshot_node(ui, repo, modified + removed, node1, tmproot)
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        changes = len(modified) + len(removed) + len(added)
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        # If node2 in not the wc or there is >1 change, copy it
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        if node2:
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            dir2 = snapshot_node(ui, repo, modified + added, node2, tmproot)
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        elif changes > 1:
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            dir2 = snapshot_wdir(ui, repo, modified + added, tmproot)
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        else:
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            # This lets the diff tool open the changed file directly
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            dir2 = ''
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            dir2root = repo.root
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        # If only one change, diff the files instead of the directories
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        if changes == 1 :
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            if len(modified):
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                dir1 = os.path.join(dir1, util.localpath(modified[0]))
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                dir2 = os.path.join(dir2root, dir2, util.localpath(modified[0]))
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            elif len(removed) :
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                dir1 = os.path.join(dir1, util.localpath(removed[0]))
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                dir2 = os.devnull
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            else:
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                dir1 = os.devnull
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                dir2 = os.path.join(dir2root, dir2, util.localpath(added[0]))
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        cmdline = ('%s %s %s %s' %
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                   (util.shellquote(diffcmd), ' '.join(diffopts),
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                    util.shellquote(dir1), util.shellquote(dir2)))
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        ui.debug('running %r in %s\n' % (cmdline, tmproot))
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        util.system(cmdline, cwd=tmproot)
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        return 1
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    finally:
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        ui.note(_('cleaning up temp directory\n'))
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        shutil.rmtree(tmproot)
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def extdiff(ui, repo, *pats, **opts):
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    '''use external program to diff repository (or selected files)
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    Show differences between revisions for the specified files, using
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    an external program.  The default program used is diff, with
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    default options "-Npru".
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    To select a different program, use the -p option.  The program
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    will be passed the names of two directories to compare.  To pass
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    additional options to the program, use the -o option.  These will
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    be passed before the names of the directories to compare.
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    When two revision arguments are given, then changes are
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    shown between those revisions. If only one revision is
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    specified then that revision is compared to the working
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    directory, and, when no revisions are specified, the
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    working directory files are compared to its parent.'''
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    program = opts['program'] or 'diff'
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    if opts['program']:
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        option = opts['option']
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    else:
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        option = opts['option'] or ['-Npru']
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    return dodiff(ui, repo, program, option, pats, opts)
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cmdtable = {
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    "extdiff":
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    (extdiff,
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     [('p', 'program', '', _('comparison program to run')),
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      ('o', 'option', [], _('pass option to comparison program')),
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      ('r', 'rev', [], _('revision')),
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     ] + commands.walkopts,
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     _('hg extdiff [OPT]... [FILE]...')),
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    }
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def uisetup(ui):
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    for cmd, path in ui.configitems('extdiff'):
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        if cmd.startswith('cmd.'):
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            cmd = cmd[4:]
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            if not path: path = cmd
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            diffopts = ui.config('extdiff', 'opts.' + cmd, '')
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            diffopts = diffopts and [diffopts] or []
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        elif cmd.startswith('opts.'):
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            continue
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        else:
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            # command = path opts
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            if path:
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                diffopts = shlex.split(path)
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                path = diffopts.pop(0)
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            else:
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                path, diffopts = cmd, []
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        def save(cmd, path, diffopts):
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            '''use closure to save diff command to use'''
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            def mydiff(ui, repo, *pats, **opts):
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                return dodiff(ui, repo, path, diffopts, pats, opts)
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            mydiff.__doc__ = '''use %(path)s to diff repository (or selected files)
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            Show differences between revisions for the specified
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            files, using the %(path)s program.
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            When two revision arguments are given, then changes are
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            shown between those revisions. If only one revision is
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            specified then that revision is compared to the working
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            directory, and, when no revisions are specified, the
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            working directory files are compared to its parent.''' % {
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                'path': util.uirepr(path),
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                }
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            return mydiff
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        cmdtable[cmd] = (save(cmd, path, diffopts),
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                         cmdtable['extdiff'][1][1:],
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                         _('hg %s [OPTION]... [FILE]...') % cmd)