diff mercurial/cmdutil.py @ 31807:e6eb86b154c5

templater: provide loop counter as "index" keyword

This was originally written for JSON templating where we would have to be
careful to not add extra comma, but seems generally useful.

Inner loop started by % operator has its own counter.

--- a/mercurial/cmdutil.py	Fri Apr 22 21:45:06 2016 +0900
+++ b/mercurial/cmdutil.py	Fri Apr 22 21:46:33 2016 +0900
@@ -8,6 +8,7 @@
 from __future__ import absolute_import
 
 import errno
+import itertools
 import os
 import re
 import tempfile
@@ -1452,6 +1453,7 @@
             self.t = formatter.maketemplater(ui, 'changeset', tmpl,
                                              cache=defaulttempl)
 
+        self._counter = itertools.count()
         self.cache = {}
 
         # find correct templates for current mode
@@ -1490,6 +1492,7 @@
         props['ctx'] = ctx
         props['repo'] = self.repo
         props['ui'] = self.repo.ui
+        props['index'] = next(self._counter)
         props['revcache'] = {'copies': copies}
         props['cache'] = self.cache