[PATCH 4 of 5] templatekw: port implementation of showparents() from changeset_templater

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1443238682 -32400
#      Sat Sep 26 12:38:02 2015 +0900
# Node ID ce0d7d32363dd33ff3227e9fab4b55af22057bde
# Parent  a8ca06ee5ffc918900d52d3024e7d51926e69628
templatekw: port implementation of showparents() from changeset_templater

It isn't cool, but we can peek an ui flag via repo.ui. So, it is possible
to implement showparents() in templatekw, and therefore we can eliminate the
dockeywords hack.

diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -1428,24 +1428,8 @@ class changeset_templater(changeset_prin
 
     def _show(self, ctx, copies, matchfn, props):
         '''show a single changeset or file revision'''
-
-        showlist = templatekw.showlist
-
-        # showparents() behavior depends on ui trace level which
-        # causes unexpected behaviors at templating level and makes
-        # it harder to extract it in a standalone function. Its
-        # behavior cannot be changed so leave it here for now.
-        def showparents(**args):
-            ctx = args['ctx']
-            parents = [[('rev', p.rev()),
-                        ('node', p.hex()),
-                        ('phase', p.phasestr())]
-                       for p in scmutil.meaningfulparents(self.repo, ctx)]
-            return showlist('parent', parents, **args)
-
         props = props.copy()
         props.update(templatekw.keywords)
-        props['parents'] = showparents
         props['templ'] = self.t
         props['ctx'] = ctx
         props['repo'] = self.repo
diff --git a/mercurial/templatekw.py b/mercurial/templatekw.py
--- a/mercurial/templatekw.py
+++ b/mercurial/templatekw.py
@@ -397,11 +397,17 @@ def showp2node(repo, ctx, templ, **args)
     parent, all digits are 0."""
     return ctx.p2().hex()
 
-def _showparents(**args):
+def showparents(**args):
     """:parents: List of strings. The parents of the changeset in "rev:node"
     format. If the changeset has only one "natural" parent (the predecessor
     revision) nothing is shown."""
-    pass
+    repo = args['repo']
+    ctx = args['ctx']
+    parents = [[('rev', p.rev()),
+                ('node', p.hex()),
+                ('phase', p.phasestr())]
+               for p in scmutil.meaningfulparents(repo, ctx)]
+    return showlist('parent', parents, **args)
 
 def showphase(repo, ctx, templ, **args):
     """:phase: String. The changeset phase name."""
@@ -491,6 +497,7 @@ keywords = {
     'p1node': showp1node,
     'p2rev': showp2rev,
     'p2node': showp2node,
+    'parents': showparents,
     'phase': showphase,
     'phaseidx': showphaseidx,
     'rev': showrev,
@@ -499,7 +506,6 @@ keywords = {
 }
 
 dockeywords = {
-    'parents': _showparents,
 }
 dockeywords.update(keywords)