patch._applydiff: accept a prefix parameter This is preparation for upcoming patches that will add support for applying a patch within a subdirectory. We normalize the prefix here because this is the main driver -- all code to apply patches is expected to go through here.

patch.makepatchmeta: accept a prefix parameter This is preparation for upcoming patches that will add support for applying a patch within a subdirectory.

patch.pathtransform: add a prefix parameter This is preparation for upcoming patches that will add support for applying a patch within a subdirectory. The prefix is applied after path components are stripped.

patch.pathtransform: add doctests In upcoming patches we're going to make this function more complex, so add some unit tests for it.

patch: rename pathstrip to pathtransform In upcoming patches we'll not just strip path components but also add new ones.

templatekw: forward _hybrid.get to raw values so that get(extras, key) works ef78450c8df6 implies that the primary goal is to allow "{get(extras, key)}", but it didn't work. I'm not sure if _hybrid should forward all unknown attributes to values, so only "get" is forwarded for now.

templater: implement _hybrid.__contains__ so that ifcontains can accept dict d8fb835376d1 is fine for "{revset()}", but "i.values()[0]" does not work if each item has more than one values such as "{bookmarks}". This fixes the problem by using list.__contains__ or dict.__contains__ appropriately.

templatekw: keep raw list or dict in _hybrid object This will allow us to handle bookmarks, extras and copies properly in "ifcontains()" and "get()".

templatekw: give name to lambda that constructs variables map of templater The constructed list is useless for "ifcontains()" and "get()". Instead, makemap() and raw dict will be passed to _hybrid object.

templatekw: convert list of key/value pairs to sortdict These sortdict objects will be passed to _hybrid later, which will allow us to handle them by "ifcontains()" and "get()" as expected.