# HG changeset patch
# User Matt Mackall <mpm@selenic.com>
# Date 1286493869 18000
# Node ID 0ae35296fbf4d486ea4228bfd93c03a844ee9fb8
# Parent  2063d36b406e45473e1687dafc315bc3a4f152ea
revsets: introduce revsingle helper

revsingle returns a context for the last revision of the supplied revspec

diff -r 2063d36b406e -r 0ae35296fbf4 mercurial/cmdutil.py
--- a/mercurial/cmdutil.py	Thu Oct 07 18:05:04 2010 -0500
+++ b/mercurial/cmdutil.py	Thu Oct 07 18:24:29 2010 -0500
@@ -111,6 +111,15 @@
         limit = None
     return limit
 
+def revsingle(repo, revspec, default=None):
+    if not revspec:
+        return repo[default]
+
+    l = revrange(repo, [revspec])
+    if len(l) < 1:
+        raise util.Abort("empty revision set")
+    return repo[l[-1]]
+
 def revpair(repo, revs):
     if not revs:
         return repo.dirstate.parents()[0], None
diff -r 2063d36b406e -r 0ae35296fbf4 mercurial/commands.py
--- a/mercurial/commands.py	Thu Oct 07 18:05:04 2010 -0500
+++ b/mercurial/commands.py	Thu Oct 07 18:24:29 2010 -0500
@@ -634,7 +634,7 @@
 
     Returns 0 on success.
     """
-    ctx = repo[opts.get('rev')]
+    ctx = cmdutil.revsingle(repo, opts.get('rev'))
     err = 1
     m = cmdutil.match(repo, (file1,) + pats, opts)
     for abs in ctx.walk(m):