templater: add inheritance support to style maps
We can now specify a base map file:
__base__ = path/to/map/file
That map file will be read and used to populate unset elements of the
current map. Unlike using %include, elements in the inherited class
will be read relative to that path.
This makes it much easier to make custom local tweaks to a style.
--- a/mercurial/templater.py Thu Aug 18 18:43:48 2016 +0900
+++ b/mercurial/templater.py Wed Aug 17 13:40:27 2016 -0500
@@ -1026,6 +1026,16 @@
raise error.ParseError(_('unmatched quotes'),
conf.source('', key))
cache[key] = unquotestring(val)
+ elif key == "__base__":
+ # treat as a pointer to a base class for this style
+ path = util.normpath(os.path.join(base, val))
+ bcache, btmap = _readmapfile(path)
+ for k in bcache:
+ if k not in cache:
+ cache[k] = bcache[k]
+ for k in btmap:
+ if k not in tmap:
+ tmap[k] = btmap[k]
else:
val = 'default', val
if ':' in val[1]: