--- a/mercurial/help/config.txt	Sun Jan 15 18:00:01 2012 -0600
+++ b/mercurial/help/config.txt	Sun Jan 15 13:50:12 2012 -0700
@@ -655,7 +655,10 @@
 various actions such as starting or finishing a commit. Multiple
 hooks can be run for the same action by appending a suffix to the
 action. Overriding a site-wide hook can be done by changing its
-value or setting it to an empty string.
+value or setting it to an empty string.  Hooks can be prioritized
+by adding a prefix of ``priority`` to the hook name on a new line
+and setting the priority.  The default priority is 0 if
+not specified.
 
 Example ``.hg/hgrc``::
 
@@ -666,6 +669,8 @@
   incoming =
   incoming.email = /my/email/hook
   incoming.autobuild = /my/build/hook
+  # force autobuild hook to run before other incoming hooks
+  priority.incoming.autobuild = 1
 
 Most hooks are run with environment variables set that give useful
 additional information. For each hook below, the environment

--- a/mercurial/hook.py	Sun Jan 15 18:00:01 2012 -0600
+++ b/mercurial/hook.py	Sun Jan 15 13:50:12 2012 -0700
@@ -124,6 +124,14 @@
         ui.warn(_('warning: %s hook %s\n') % (name, desc))
     return r
 
+def _allhooks(ui):
+    hooks = []
+    for name, cmd in ui.configitems('hooks'):
+        if not name.startswith('priority'):
+            priority = ui.configint('hooks', 'priority.%s' % name, 0)
+            hooks.append((-priority, len(hooks), name, cmd))
+    return [(k, v) for p, o, k, v in sorted(hooks)]
+
 _redirect = False
 def redirect(state):
     global _redirect
@@ -147,7 +155,7 @@
             pass
 
     try:
-        for hname, cmd in ui.configitems('hooks'):
+        for hname, cmd in _allhooks(ui):
             if hname.split('.')[0] != name or not cmd:
                 continue
             if util.safehasattr(cmd, '__call__'):

--- a/tests/test-hook.t	Sun Jan 15 18:00:01 2012 -0600
+++ b/tests/test-hook.t	Sun Jan 15 13:50:12 2012 -0700
@@ -553,3 +553,19 @@
   calling hook pre-identify: hooktests.verbosehook
   verbose output from hook
   cb9a9f314b8b
+
+Ensure hooks can be prioritized
+
+  $ echo '[hooks]' > .hg/hgrc
+  $ echo 'pre-identify.a = python:hooktests.verbosehook' >> .hg/hgrc
+  $ echo 'pre-identify.b = python:hooktests.verbosehook' >> .hg/hgrc
+  $ echo 'priority.pre-identify.b = 1' >> .hg/hgrc
+  $ echo 'pre-identify.c = python:hooktests.verbosehook' >> .hg/hgrc
+  $ hg id --verbose
+  calling hook pre-identify.b: hooktests.verbosehook
+  verbose output from hook
+  calling hook pre-identify.a: hooktests.verbosehook
+  verbose output from hook
+  calling hook pre-identify.c: hooktests.verbosehook
+  verbose output from hook
+  cb9a9f314b8b