--- a/extensions/revinfo.py	Mon Oct 12 09:11:43 2015 +0200
+++ b/extensions/revinfo.py	Thu Dec 10 01:06:04 2015 +0100
@@ -22,6 +22,7 @@
          [("r", "rev", "",  _('revision to handle'), _('REV')),
           ("", "amend", None, _('amend a given file with path information')),
           ("p", "path", [], _('the configured default path'), _('SOURCE')),
+          ("d", "data", [], _("add an extra `KEY: VALUE' pair into the file"), _('KEY=VALUE')),
           ],
          _("hg revinfo [OPTION]... [DEST]"))
 def revinfo(ui, repo, dest=None, **opts):
@@ -58,9 +59,22 @@
             raise util.Abort(_("no working directory: please specify a revision"))
 
         msg = archival.buildmetadata(ctx)
+
+    for kv in opts.get("data"):
+        kvparts = [ i.strip() for i in kv.split("=", 1) ]
+        if len(kvparts) == 2:
+            msg += "%s: %s\n" % tuple(kvparts)
+        else:
+            raise util.Abort(_("given data `%s' is not a KEY=VALUE pair") % (kv, ))
+
     paths = opts.get("path")
-    if not paths:
-        paths = ["default"]
+    #
+    # When not amending and no path options is given print the
+    # "default" path
+    #
+    if not opts.get("amend"):
+        if not paths:
+            paths = ["default"]
     for canonicalpath in paths:
         if canonicalpath:
             for name, path in sorted(ui.paths.iteritems()):