[PATCH] template: fix shortest(node) function in pure mercurial

Durham Goode durham at fb.com
Wed Feb 5 22:37:44 CST 2014

# HG changeset patch
# User Durham Goode <durham at fb.com>
# Date 1391660548 28800
#      Wed Feb 05 20:22:28 2014 -0800
# Node ID d16e720434515abbe537e03a102ce151d1931165
# Parent  aa51392da50763f3e7b9ec40acc3a97682488b66
template: fix shortest(node) function in pure mercurial

Pure mercurial (i.e. without c extensions) does not support partialmatch() on
the revlog index, so we must fall back to use revlog._partialmatch() to handle
that case for us. The tests caught this.

We don't use revlog._partialmatch() for the normal case because it performs a
very expensive index iteration when the string being tested fails to find a
unique result via index.partialmatch(). It does this in order to filter
out hidden revs in hopes of the string being unique amongst non-hidden revs.
For the shortest(node) case, we'd prefer performance over worrying about
hidden revs.

diff --git a/mercurial/templater.py b/mercurial/templater.py
--- a/mercurial/templater.py
+++ b/mercurial/templater.py
@@ -368,7 +368,14 @@
     cl = mapping['ctx']._repo.changelog
     def isvalid(test):
-            cl.index.partialmatch(test)
+            try:
+                cl.index.partialmatch(test)
+            except AttributeError:
+                # Pure mercurial doesn't support partialmatch on the index.
+                # Fallback to the slow way.
+                if cl._partialmatch(test) is None:
+                    return False
                 return False

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