diff mercurial/formatter.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/formatter.py	Fri Apr 22 21:45:06 2016 +0900
+++ b/mercurial/formatter.py	Fri Apr 22 21:46:33 2016 +0900
@@ -103,6 +103,7 @@
 
 from __future__ import absolute_import
 
+import itertools
 import os
 
 from .i18n import _
@@ -338,6 +339,7 @@
         self._topic = topic
         self._t = gettemplater(ui, topic, opts.get('template', ''),
                                cache=templatekw.defaulttempl)
+        self._counter = itertools.count()
         self._cache = {}  # for templatekw/funcs to store reusable data
     def context(self, **ctxs):
         '''insert context objects to be used to render template keywords'''
@@ -350,6 +352,7 @@
         props = {}
         if 'ctx' in self._item:
             props.update(templatekw.keywords)
+        props['index'] = next(self._counter)
         # explicitly-defined fields precede templatekw
         props.update(self._item)
         if 'ctx' in self._item: