patch.py: re-add the ability to use an external patch program
This is now invoked by default only if ui.patch is set. Otherwise, we
use our built-in patch. If that fails because it can't find any valid
hunks, we'll fall back to trying the external patch command.
uisetup called
ui.parentui isnot None
reposetup called for a
ui == repo.ui
Foo
uisetup called
ui.parentui is None
reposetup called for a
ui == repo.ui
reposetup called for b
ui == repo.ui
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
uisetup called
ui.parentui is None
Bar
% module/__init__.py-style
uisetup called
ui.parentui isnot None
reposetup called for a
ui == repo.ui
Foo
empty extension - empty cmdtable
no commands defined