new extension: extdiff. allows to use external diff program.

hgext/extdiff.py

@@ -0,0 +1,150 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, incorporated herein by reference.
+#
+# allow to use external programs to compare revisions, or revision
+# with working dir. program is called with two arguments: paths to
+# directories containing snapshots of files to compare.
+#
+# to enable:
+#
+#   [extensions]
+#   hgext.extdiff =
+#
+# also allows to configure new diff commands, so you do not need to
+# type "hg extdiff -p kdiff3" always.
+#
+#   [extdiff]
+#   # add new command called vdiff, runs kdiff3
+#   cmd.vdiff = kdiff3
+#   # add new command called meld, runs meld (no need to name twice)
+#   cmd.meld =
+#
+# you can use -I/-X and list of file or directory names like normal
+# "hg diff" command. extdiff makes snapshots of only needed files, so
+# compare program will be fast.
+
+from mercurial.demandload import demandload
+from mercurial.i18n import gettext as _
+from mercurial.node import *
+demandload(globals(), 'mercurial:commands,util os shutil tempfile')
+
+def dodiff(ui, repo, diffcmd, pats, opts):
+    def snapshot_node(files, node):
+        '''snapshot files as of some revision'''
+        changes = repo.changelog.read(node)
+        mf = repo.manifest.read(changes[0])
+        dirname = '%s.%s' % (os.path.basename(repo.root), short(node))
+        base = os.path.join(tmproot, dirname)
+        os.mkdir(base)
+        if not ui.quiet:
+            ui.write_err(_('making snapshot of %d files from rev %s\n') %
+                         (len(files), short(node)))
+        for fn in files:
+            wfn = util.pconvert(fn)
+            ui.note('  %s\n' % wfn)
+            dest = os.path.join(base, wfn)
+            destdir = os.path.dirname(dest)
+            if not os.path.isdir(destdir):
+                os.makedirs(destdir)
+            repo.wwrite(wfn, repo.file(fn).read(mf[fn]), open(dest, 'w'))
+        return dirname
+
+    def snapshot_wdir(files):
+        '''snapshot files from working directory.
+        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)
+        base = os.path.join(tmproot, dirname)
+        os.mkdir(base)
+        if not ui.quiet:
+            ui.write_err(_('making snapshot of %d files from working dir\n') %
+                         (len(files)))
+        for fn in files:
+            wfn = util.pconvert(fn)
+            ui.note('  %s\n' % wfn)
+            dest = os.path.join(base, wfn)
+            destdir = os.path.dirname(dest)
+            if not os.path.isdir(destdir):
+                os.makedirs(destdir)
+            fp = open(dest, 'w')
+            for chunk in util.filechunkiter(repo.wopener(wfn)):
+                fp.write(chunk)
+        return dirname
+
+    node1, node2 = commands.revpair(ui, repo, opts['rev'])
+    files, matchfn, anypats = commands.matchpats(repo, pats, opts)
+    modified, added, removed, deleted, unknown = repo.changes(
+        node1, node2, files, match=matchfn)
+    if not (modified or added or removed):
+        return 0
+
+    tmproot = tempfile.mkdtemp(prefix='extdiff.')
+    try:
+        dir1 = snapshot_node(modified + removed, node1)
+        if node2:
+            dir2 = snapshot_node(modified + added, node2)
+        else:
+            dir2 = snapshot_wdir(modified + added)
+        util.system('%s %s "%s" "%s"' %
+                    (diffcmd, ' '.join(opts['option']), dir1, dir2),
+                    cwd=tmproot)
+        return 1
+    finally:
+        ui.note(_('cleaning up temp directory\n'))
+        shutil.rmtree(tmproot)
+
+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 -Pnru".
+    To select a different program, use the -p option.  The program
+    will be passed the names of two directories to compare.  To pass
+    additional options to the program, use the -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.'''
+    return dodiff(ui, repo, opts['program'] or 'diff -Npru', pats, opts)
+
+cmdtable = {
+    "extdiff":
+    (extdiff,
+     [('p', 'program', '', _('comparison program to run')),
+      ('o', 'option', [], _('pass option to comparison program')),
+      ('r', 'rev', [], _('revision')),
+      ('I', 'include', [], _('include names matching the given patterns')),
+      ('X', 'exclude', [], _('exclude names matching the given patterns'))],
+     _('hg extdiff [OPT]... [FILE]...')),
+    }
+
+def uisetup(ui):
+    for cmd, path in ui.configitems('extdiff'):
+        if not cmd.startswith('cmd.'): continue
+        cmd = cmd[4:]
+        if not path: path = cmd
+        def save(cmd, path):
+            '''use closure to save diff command to use'''
+            def mydiff(ui, repo, *pats, **opts):
+                return dodiff(ui, repo, path, pats, opts)
+            mydiff.__doc__ = '''use %s to diff repository (or selected files)
+
+            Show differences between revisions for the specified
+            files, using the %s program.
+
+            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.''' % (cmd, cmd)
+            return mydiff
+        cmdtable[cmd] = (save(cmd, path),
+                         cmdtable['extdiff'][1][1:],
+                         _('hg %s [OPT]... [FILE]...') % cmd)