Change repo.comit to return None on error or the new revision number on

Change repo.comit to return None on error or the new revision number on
success

This allows the caller to correctly record the new revision number

--- a/mercurial/hg.py	Sun Aug 14 20:08:35 2005 -0800
+++ b/mercurial/hg.py	Sun Aug 14 20:09:01 2005 -0800
@@ -875,10 +875,10 @@
 
         if not commit and not remove and not force:
             self.ui.status("nothing changed\n")
-            return
+            return None
 
         if not self.hook("precommit"):
-            return 1
+            return None
 
         p1, p2 = self.dirstate.parents()
         c1 = self.changelog.read(p1)
@@ -932,12 +932,11 @@
             edittext += "".join(["HG: removed %s\n" % f for f in remove])
             edittext = self.ui.edit(edittext)
             if not edittext.rstrip():
-                return 1
+                return None
             text = edittext
 
         user = user or self.ui.username()
         n = self.changelog.add(mn, new, text, tr, p1, p2, user, date)
-
         tr.close()
 
         self.dirstate.setparents(n)
@@ -945,7 +944,8 @@
         self.dirstate.forget(remove)
 
         if not self.hook("commit", node=hex(n)):
-            return 1
+            return None
+        return n
 
     def walk(self, node = None, files = [], match = util.always):
         if node: