[PATCH] extensions: suppress load errors when ui is plain

[steve at borho.org]

# HG changeset patch
# User Steve Borho <steve at borho.org>
# Date 1273499056 18000
# Node ID 3144c73c953abce9afb1dac24728bba498b69ab7
# Parent  94afe7bc87a9cedd770c16fbf904c7d1bdb880c4
extensions: suppress load errors when ui is plain

Scripts and GUIs will set HGPLAIN to get a consistent output.  They
would also appreciate not getting extension warnings on stderr.

diff -r 94afe7bc87a9 -r 3144c73c953a mercurial/extensions.py
--- a/mercurial/extensions.py
+++ b/mercurial/extensions.py
@@ -79,7 +79,9 @@
         except KeyboardInterrupt:
             raise
         except Exception, inst:
-            if path:
+            if ui.plain():
+                continue
+            elif path:
                 ui.warn(_("*** failed to import extension %s from %s: %s\n")
                         % (name, path, inst))
             else: