# HG changeset patch
# User Bryan O'Sullivan <bryano@fb.com>
# Date 1368555795 25200
# Node ID 3bfd7f1e7485d81477a52be101c52c94601132d1
# Parent  4b9e5b71dfa9b427bc73b15ebbcad51c1145b548
summary: augment output with info from extensions

diff -r 4b9e5b71dfa9 -r 3bfd7f1e7485 mercurial/cmdutil.py
--- a/mercurial/cmdutil.py	Thu May 16 16:20:10 2013 -0500
+++ b/mercurial/cmdutil.py	Tue May 14 11:23:15 2013 -0700
@@ -2082,3 +2082,6 @@
         return decorator
 
     return cmd
+
+# a list of (ui, repo) functions called by commands.summary
+summaryhooks = util.hooks()
diff -r 4b9e5b71dfa9 -r 3bfd7f1e7485 mercurial/commands.py
--- a/mercurial/commands.py	Thu May 16 16:20:10 2013 -0500
+++ b/mercurial/commands.py	Tue May 14 11:23:15 2013 -0700
@@ -5489,6 +5489,8 @@
         ui.write(_('update: %d new changesets, %d branch heads (merge)\n') %
                  (new, len(bheads)))
 
+    cmdutil.summaryhooks(ui, repo)
+
     if opts.get('remote'):
         t = []
         source, branches = hg.parseurl(ui.expandpath('default'))
diff -r 4b9e5b71dfa9 -r 3bfd7f1e7485 mercurial/util.py
--- a/mercurial/util.py	Thu May 16 16:20:10 2013 -0500
+++ b/mercurial/util.py	Tue May 14 11:23:15 2013 -0700
@@ -1946,3 +1946,19 @@
         return int(t)
     except ValueError:
         raise error.ParseError(_("couldn't parse size: %s") % s)
+
+class hooks(object):
+    '''A collection of hook functions that can be used to extend a
+    function's behaviour. Hooks are called in lexicographic order,
+    based on the names of their sources.'''
+
+    def __init__(self):
+        self._hooks = []
+
+    def add(self, source, hook):
+        self._hooks.append((source, hook))
+
+    def __call__(self, *args):
+        self._hooks.sort(key=lambda x: x[0])
+        for source, hook in self._hooks:
+            hook(*args)