diff -r 5acf520f2115 -r 0617e7d497f6 hgkw/keyword.py
--- a/hgkw/keyword.py	Thu Dec 21 11:02:21 2006 +0100
+++ b/hgkw/keyword.py	Thu Dec 21 16:58:28 2006 +0100
@@ -1,7 +1,26 @@
-from mercurial import hg, filelog, revlog, context, util
-import os.path, re
+from mercurial.i18n import _
+from mercurial import commands, cmdutil, context, filelog, revlog, util
+import os.path, re, sys
+
+# supported keywords for use in regexes
+hgkeywords = 'Id|Header|Author|Date|Revision|RCSFile|Source'
+
+def kwexpand(matchobj, repo, Revision, f, date, Author):
+    '''Called by kwfilelog.read and pretxnkw.
+    Sets supported keywords as local variables and evaluates them to
+    their expansion if matchobj is equal to string representation.'''
 
-hgkeywords = 'Id|Header|Author|Date|Revision|RCSFile|Source'
+    RCSFile = os.path.basename(f)+',v'
+    Source = os.path.join(repo.root, f)+',v'
+    Date = util.datestr(date=date)
+    revdateauth = '%s %s %s' % (Revision,       # %Y-%m-%d %H:%M:%S
+            util.datestr(date=date, format=util.defaultdateformats[0]),
+            util.shortuser(Author))
+    Header = '%s %s' % (Source, revdateauth)
+    Id = '%s %s' % (RCSFile, revdateauth)
+
+    return '$%s: %s $' % (matchobj.group(1), eval(matchobj.group(1)))
+
 
 def reposetup(ui, repo):
     if not repo.local():
@@ -36,25 +55,14 @@
                     mf = util.matcher(self._repo.root,
                             '', [pat], [], [])[1]
                     if mf(f):
-                        re_kw = re.compile(r'\$(%s)\$' % hgkeywords)
 
-                        def kwexpand(matchobj):
-                            RCSFile = os.path.basename(f)+',v'
-                            Source = os.path.join(self._repo.root, f)+',v'
-                            Revision = c.changectx()
-                            Date = util.datestr(date=c.date())
-                            Author = c.user()
-                            revdateauth = '%s %s %s' % (
-                                    Revision,
-                                    util.datestr(date=c.date(),
-                                        format=util.defaultdateformats[0]),
-                                    util.shortuser(Author))
-                            Header = '%s %s' % (Source, revdateauth)
-                            Id = '%s %s' % (RCSFile, revdateauth)
-                            return '$%s: %s $' % (
-                                    matchobj.group(1), eval(matchobj.group(1)))
+                        def kwexpander(matchobj):
+                            return kwexpand(matchobj,
+                                    self._repo, c.changectx(), f,
+                                    c.date(), c.user())
 
-                        return re_kw.sub(kwexpand, data)
+                        re_kw = re.compile(r'\$(%s)\$' % hgkeywords)
+                        return re_kw.sub(kwexpander, data)
             return data
 
         def add(self, text, meta, tr, link, p1=None, p2=None):
@@ -66,3 +74,58 @@
 
     filelog.filelog = kwfilelog
     repo.__class__ = kwrepo
+
+
+def pretxnkw(ui, repo, hooktype, **args):
+    '''pretxncommit hook that collects candidates for keyword expansion
+    on commit and expands keywords in working dir.'''
+
+    if hooktype != 'pretxncommit': # bail out with error
+        return True
+
+    # reparse args, opts again as pretxncommit hook is silent about them
+    cmd, sysargs, globalopts, cmdopts = commands.parse(ui, sys.argv[1:])[1:]
+    # exclude tag and import
+    if repr(cmd).split()[1] in ('tag', 'import_'):
+        return False
+
+    files, match, anypats = cmdutil.matchpats(repo, sysargs, cmdopts)
+    # validity checks should have been done already
+    modified, added = repo.status(files=files, match=match)[:2]
+    candidates = [f for f in modified + added if not f.startswith('.hg')]
+
+    if not candidates:
+        return False
+
+    # only check files that are configured in keyword section
+    files = []
+    # python2.4: files = set()
+    for pat, opt in repo.ui.configitems('keyword'):
+        if opt == 'expand':
+            mf = util.matcher(repo.root, '', [pat], [], [])[1]
+            for candidate in candidates:
+                if mf(candidate) and candidate not in files:
+                    files.append(candidate)
+                # python2.4:
+                # if mf(candidate): files.add(candidate)
+
+    if not files:
+        return False
+
+    user, date = repo.changelog.read(repo.changelog.tip())[1:3]
+    # expand both expanded and unexpanded keywords
+    re_kw = re.compile(r'\$(%s)(: [^$]+? )?\$' % hgkeywords)
+
+    for f in files:
+        data = repo.wfile(f).read()
+        if not util.binary(data):
+
+            def kwexpander(matchobj):
+                return kwexpand(matchobj,
+                        repo, args['node'][:12], f, date, user)
+
+            data, kwct = re_kw.subn(kwexpander, data)
+            if kwct:
+                ui.note(_('expanding keywords in %s\n' % f))
+                # backup file?
+                repo.wfile(f, 'w').write(data)