[PATCH 4 of 9] templater: drop 'templ' from resources dict

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1521209361 -32400
#      Fri Mar 16 23:09:21 2018 +0900
# Node ID fb45cb16834ac9919f7a8b4678fb31ed74d3ffcd
# Parent  38d5aa2f92ff6fabe6242eae313f06860abc5148
templater: drop 'templ' from resources dict

Partially resolves cycle, templ -> context -> templ. This will make it easier
to replace the resources dict with new immutable resource mapper interface.

diff --git a/mercurial/templatekw.py b/mercurial/templatekw.py
--- a/mercurial/templatekw.py
+++ b/mercurial/templatekw.py
@@ -35,19 +35,8 @@ compatdict = templateutil.compatdict
 compatlist = templateutil.compatlist
 _showcompatlist = templateutil._showcompatlist
 
-# TODO: temporary hack for porting; will be removed soon
-class _fakecontextwrapper(object):
-    def __init__(self, templ):
-        self._templ = templ
-
-    def preload(self, t):
-        return t in self._templ
-
-    def process(self, t, mapping):
-        return self._templ.generatenamed(t, mapping)
-
 def _showlist(name, values, templ, mapping, plural=None, separator=' '):
-    context = _fakecontextwrapper(templ)
+    context = templ  # this is actually a template context, not a templater
     return _showcompatlist(context, mapping, name, values, plural, separator)
 
 def showdict(name, data, mapping, plural=None, key='key', value='value',
diff --git a/mercurial/templater.py b/mercurial/templater.py
--- a/mercurial/templater.py
+++ b/mercurial/templater.py
@@ -738,8 +738,7 @@ class templater(object):
         self.filters = templatefilters.filters.copy()
         self.filters.update(filters)
         self.defaults = defaults
-        self._resources = {'templ': lambda context, mapping, key: self}
-        self._resources.update(resources)
+        self._resources = resources
         self._aliases = aliases
         self.minchunk, self.maxchunk = minchunk, maxchunk
         self.ecache = {}
diff --git a/mercurial/templateutil.py b/mercurial/templateutil.py
--- a/mercurial/templateutil.py
+++ b/mercurial/templateutil.py
@@ -348,8 +348,11 @@ def runsymbol(context, mapping, key, def
             v = default
     if callable(v) and getattr(v, '_requires', None) is None:
         # old templatekw: expand all keywords and resources
+        # (TODO: deprecate this after porting web template keywords to new API)
         props = {k: f(context, mapping, k)
                  for k, f in context._resources.items()}
+        # pass context to _showcompatlist() through templatekw._showlist()
+        props['templ'] = context
         props.update(mapping)
         return v(**pycompat.strkwargs(props))
     if callable(v):