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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 of the
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# GNU General Public License version 2 or any later version.
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'''command to allow external programs to compare revisions
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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 directory. The external
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diff 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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The extdiff extension also allows you 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 meld, runs meld (no need to name twice). If
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# the meld executable is not available, the meld tool in [merge-tools]
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# will be used, if available
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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) Non
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# 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" \\
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"+execute 'DirDiff' fnameescape(argv(0)) fnameescape(argv(1))"
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Tool arguments can include variables that are expanded at runtime::
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$parent1, $plabel1 - filename, descriptive label of first parent
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$child, $clabel - filename, descriptive label of child revision
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$parent2, $plabel2 - filename, descriptive label of second parent
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$root - repository root
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$parent is an alias for $parent1.
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The extdiff extension will look in your [diff-tools] and [merge-tools]
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sections for diff tool arguments, when none are specified in [extdiff].
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::
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[extdiff]
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kdiff3 =
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[diff-tools]
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kdiff3.diffargs=--L1 '$plabel1' --L2 '$clabel' $parent $child
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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 short, nullid
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from mercurial import cmdutil, scmutil, util, commands, encoding, filemerge
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import os, shlex, shutil, tempfile, re
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cmdtable = {}
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command = cmdutil.command(cmdtable)
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# Note for extension authors: ONLY specify testedwith = 'internal' for
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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# be specifying the version(s) of Mercurial they are tested with, or
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# leave the attribute unspecified.
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testedwith = 'internal'
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def snapshot(ui, repo, files, node, tmproot):
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'''snapshot files as of some revision
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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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if node is not None:
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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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if node is not None:
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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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else:
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ui.note(_('making snapshot of %d files from working directory\n') %
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(len(files)))
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wopener = scmutil.opener(base)
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fns_and_mtime = []
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ctx = repo[node]
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for fn in sorted(files):
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wfn = util.pconvert(fn)
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if wfn not in ctx:
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# File doesn't exist; could be a bogus modify
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continue
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ui.note(' %s\n' % wfn)
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dest = os.path.join(base, wfn)
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fctx = ctx[wfn]
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data = repo.wwritedata(wfn, fctx.data())
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if 'l' in fctx.flags():
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wopener.symlink(data, wfn)
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else:
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wopener.write(wfn, data)
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if 'x' in fctx.flags():
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util.setflags(dest, False, True)
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if node is None:
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fns_and_mtime.append((dest, repo.wjoin(fn),
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os.lstat(dest).st_mtime))
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return dirname, fns_and_mtime
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def dodiff(ui, repo, cmdline, pats, opts):
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'''Do the actual diff:
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- copy to a temp structure if diffing 2 internal revisions
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- copy to a temp structure if diffing working revision with
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another one and more than 1 file is changed
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- just invoke the diff for a single file in the working dir
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'''
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revs = opts.get('rev')
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change = opts.get('change')
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do3way = '$parent2' in cmdline
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if revs and change:
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msg = _('cannot specify --rev and --change at the same time')
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raise util.Abort(msg)
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elif change:
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node2 = scmutil.revsingle(repo, change, None).node()
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node1a, node1b = repo.changelog.parents(node2)
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else:
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node1a, node2 = scmutil.revpair(repo, revs)
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if not revs:
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node1b = repo.dirstate.p2()
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else:
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node1b = nullid
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# Disable 3-way merge if there is only one parent
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if do3way:
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if node1b == nullid:
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do3way = False
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matcher = scmutil.match(repo[node2], pats, opts)
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mod_a, add_a, rem_a = map(set, repo.status(node1a, node2, matcher)[:3])
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if do3way:
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mod_b, add_b, rem_b = map(set, repo.status(node1b, node2, matcher)[:3])
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else:
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mod_b, add_b, rem_b = set(), set(), set()
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modadd = mod_a | add_a | mod_b | add_b
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common = modadd | rem_a | rem_b
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if not common:
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return 0
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tmproot = tempfile.mkdtemp(prefix='extdiff.')
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try:
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# Always make a copy of node1a (and node1b, if applicable)
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dir1a_files = mod_a | rem_a | ((mod_b | add_b) - add_a)
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dir1a = snapshot(ui, repo, dir1a_files, node1a, tmproot)[0]
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rev1a = '@%d' % repo[node1a].rev()
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if do3way:
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dir1b_files = mod_b | rem_b | ((mod_a | add_a) - add_b)
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dir1b = snapshot(ui, repo, dir1b_files, node1b, tmproot)[0]
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rev1b = '@%d' % repo[node1b].rev()
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else:
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dir1b = None
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rev1b = ''
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fns_and_mtime = []
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# If node2 in not the wc or there is >1 change, copy it
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dir2root = ''
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rev2 = ''
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if node2:
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dir2 = snapshot(ui, repo, modadd, node2, tmproot)[0]
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rev2 = '@%d' % repo[node2].rev()
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elif len(common) > 1:
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#we only actually need to get the files to copy back to
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#the working dir in this case (because the other cases
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#are: diffing 2 revisions or single file -- in which case
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#the file is already directly passed to the diff tool).
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dir2, fns_and_mtime = snapshot(ui, repo, modadd, None, 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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label1a = rev1a
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label1b = rev1b
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label2 = rev2
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# If only one change, diff the files instead of the directories
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# Handle bogus modifies correctly by checking if the files exist
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if len(common) == 1:
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common_file = util.localpath(common.pop())
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dir1a = os.path.join(tmproot, dir1a, common_file)
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label1a = common_file + rev1a
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if not os.path.isfile(dir1a):
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dir1a = os.devnull
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if do3way:
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dir1b = os.path.join(tmproot, dir1b, common_file)
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label1b = common_file + rev1b
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if not os.path.isfile(dir1b):
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dir1b = os.devnull
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dir2 = os.path.join(dir2root, dir2, common_file)
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label2 = common_file + rev2
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# Function to quote file/dir names in the argument string.
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# When not operating in 3-way mode, an empty string is
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# returned for parent2
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replace = {'parent': dir1a, 'parent1': dir1a, 'parent2': dir1b,
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'plabel1': label1a, 'plabel2': label1b,
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'clabel': label2, 'child': dir2,
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'root': repo.root}
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def quote(match):
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pre = match.group(2)
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key = match.group(3)
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if not do3way and key == 'parent2':
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return pre
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return pre + util.shellquote(replace[key])
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# Match parent2 first, so 'parent1?' will match both parent1 and parent
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regex = (r'''(['"]?)([^\s'"$]*)'''
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r'\$(parent2|parent1?|child|plabel1|plabel2|clabel|root)\1')
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if not do3way and not re.search(regex, cmdline):
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cmdline += ' $parent1 $child'
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cmdline = re.sub(regex, quote, cmdline)
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ui.debug('running %r in %s\n' % (cmdline, tmproot))
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ui.system(cmdline, cwd=tmproot)
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for copy_fn, working_fn, mtime in fns_and_mtime:
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if os.lstat(copy_fn).st_mtime != mtime:
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ui.debug('file changed while diffing. '
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'Overwriting: %s (src: %s)\n' % (working_fn, copy_fn))
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util.copyfile(copy_fn, working_fn)
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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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@command('extdiff',
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[('p', 'program', '',
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_('comparison program to run'), _('CMD')),
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('o', 'option', [],
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_('pass option to comparison program'), _('OPT')),
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('r', 'rev', [], _('revision'), _('REV')),
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('c', 'change', '', _('change made by revision'), _('REV')),
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] + commands.walkopts,
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_('hg extdiff [OPT]... [FILE]...'),
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inferrepo=True)
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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/--program option. The
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program will be passed the names of two directories to compare. To
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pass additional options to the program, use -o/--option. These
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will be passed before the names of the directories to compare.
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When two revision arguments are given, then changes are shown
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between those revisions. If only one revision is specified then
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that revision is compared to the working directory, and, when no
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revisions are specified, the working directory files are compared
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to its parent.'''
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program = opts.get('program')
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option = opts.get('option')
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if not program:
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program = 'diff'
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option = option or ['-Npru']
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cmdline = ' '.join(map(util.shellquote, [program] + option))
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return dodiff(ui, repo, cmdline, pats, opts)
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def uisetup(ui):
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for cmd, path in ui.configitems('extdiff'):
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path = util.expandpath(path)
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if cmd.startswith('cmd.'):
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cmd = cmd[4:]
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if not path:
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path = util.findexe(cmd)
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if path is None:
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path = filemerge.findexternaltool(ui, cmd) or cmd
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diffopts = ui.config('extdiff', 'opts.' + cmd, '')
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cmdline = util.shellquote(path)
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if diffopts:
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cmdline += ' ' + diffopts
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elif cmd.startswith('opts.'):
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continue
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else:
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if path:
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# case "cmd = path opts"
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cmdline = path
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diffopts = len(shlex.split(cmdline)) > 1
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else:
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# case "cmd ="
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path = util.findexe(cmd)
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if path is None:
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path = filemerge.findexternaltool(ui, cmd) or cmd
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cmdline = util.shellquote(path)
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diffopts = False
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# look for diff arguments in [diff-tools] then [merge-tools]
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if not diffopts:
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args = ui.config('diff-tools', cmd+'.diffargs') or \
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ui.config('merge-tools', cmd+'.diffargs')
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if args:
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cmdline += ' ' + args
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def save(cmdline):
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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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options = ' '.join(map(util.shellquote, opts['option']))
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if options:
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options = ' ' + options
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return dodiff(ui, repo, cmdline + options, pats, opts)
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doc = _('''\
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use %(path)s to diff repository (or selected files)
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Show differences between revisions for the specified files, using
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the %(path)s program.
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When two revision arguments are given, then changes are shown
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between those revisions. If only one revision is specified then
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that revision is compared to the working directory, and, when no
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revisions are specified, the working directory files are compared
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to its parent.\
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''') % {'path': util.uirepr(path)}
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# We must translate the docstring right away since it is
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# used as a format string. The string will unfortunately
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# be translated again in commands.helpcmd and this will
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# fail when the docstring contains non-ASCII characters.
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# Decoding the string to a Unicode string here (using the
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# right encoding) prevents that.
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mydiff.__doc__ = doc.decode(encoding.encoding)
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return mydiff
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cmdtable[cmd] = (save(cmdline),
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cmdtable['extdiff'][1][1:],
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_('hg %s [OPTION]... [FILE]...') % cmd)
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