--- a/extensions/revinfo.py	Sun Sep 27 13:34:06 2015 +0200
+++ b/extensions/revinfo.py	Sun Sep 27 13:49:09 2015 +0200
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 """write a revision summary similar to .hg_archival.txt
-
 """
 
 __version__ = "1.0"
@@ -21,6 +20,7 @@
 
 @command("revinfo",
          [("r", "rev", "",  _('revision to handle'), _('REV')),
+          ("a", "amend", None, _('amend a given file with path information')),
           ("p", "path", "default", _('the configured default path'), _('SOURCE')),
           ],
          _("hg revinfo [OPTION]... [DEST]"))
@@ -38,15 +38,26 @@
     printed as "path" item to the output. Disable this by providing
     an empty SOURCE.
 
+    Use --amend to extend a given file with a "path" item.
+    Can also be used to put more than one path item into the file.
+
     The printed information is the same as the :hg:`archive` command
-    writes into ".hg_archival.txt".
-
+    writes into ".hg_archival.txt". The "path" info is an extra item.
     """
-    ctx = scmutil.revsingle(repo, opts.get("rev"))
-    if not ctx:
-        raise util.Abort(_('no working directory: please specify a revision'))
+    if opts.get("amend") and opts.get("rev"):
+        raise util.Abort(_("cannot use -r/--rev together with --amend"))
 
-    msg = archival.buildmetadata(ctx)
+    if opts.get("amend"):
+        if not dest:
+            raise util.Abort(_('need a destination file with --amend'))
+        with open(dest, "rb") as rfile:
+            msg = rfile.read()
+    else:
+        ctx = scmutil.revsingle(repo, opts.get("rev"))
+        if not ctx:
+            raise util.Abort(_("no working directory: please specify a revision"))
+
+        msg = archival.buildmetadata(ctx)
     canonicalpath = opts.get("path")
     if canonicalpath:
         for name, path in sorted(ui.paths.iteritems()):