diff -r 393d6f8ea83c -r e086f7eb0198 hgkw/keyword.py
--- a/hgkw/keyword.py	Tue Jan 16 01:04:46 2007 +0100
+++ b/hgkw/keyword.py	Tue Jan 16 03:14:40 2007 +0100
@@ -17,6 +17,9 @@
 You can either use the default cvs-like keywords or provide your
 own in hgrc.
 
+Expansions spanning more than one line are truncated to their first line.
+Incremental expansion (like CVS' $Log$) is not supported.
+
 Default $keywords$ and their $keyword: substition $ are:
     Revision: changeset id
     Author:   username
@@ -40,7 +43,7 @@
     # in case you prefer your own keyword maps over the cvs-like defaults:
     [keywordmaps]
     HGdate = {date|rfc822date}
-    lastlog = {desc|firstline}
+    lastlog = {desc} ## same as {desc|firstline} in this context
     checked in by = {author}
     ...
 '''
@@ -106,7 +109,8 @@
         self.t.use_template(template)
         self.ui.pushbuffer()
         self.t.show(changenode=node, root=self.repo.root, file=path)
-        return '$%s: %s $' % (kw, self.ui.popbuffer())
+        expansion = templater.firstline(self.ui.popbuffer())
+        return '$%s: %s $' % (kw, expansion)
 
 
 def reposetup(ui, repo):