copies: replace duplicatecopies() by function that takes contexts
The callers mostly have context objects, so let's avoid looking up the
same context objects inside `duplicatecopies()`.
I also renamed the function to `graftcopies()` since I think that
better matches its purpose. I did it in the same commit so it's easier
for extensions to switch between the functions.
Differential Revision: https://phab.mercurial-scm.org/D7858
# Dummy extension to define a namespace containing revision names
from __future__ import absolute_import
from mercurial import namespaces
def reposetup(ui, repo):
names = {b'r%d' % rev: repo[rev].node() for rev in repo}
namemap = lambda r, name: names.get(name)
nodemap = lambda r, node: [b'r%d' % repo[node].rev()]
ns = namespaces.namespace(
b'revnames',
templatename=b'revname',
logname=b'revname',
listnames=lambda r: names.keys(),
namemap=namemap,
nodemap=nodemap,
)
repo.names.addnamespace(ns)