shelve: use backup functions instead of manually copying dirstate
This increases encapsulation of dirstate: the dirstate file is private
to the dirstate module and shouldn't be touched by extensions directly.
# extension to emulate interupting filemerge._filemerge
from __future__ import absolute_import
from mercurial import (
error,
extensions,
filemerge,
)
def failfilemerge(filemergefn,
premerge, repo, mynode, orig, fcd, fco, fca, labels=None):
raise error.Abort("^C")
return filemergefn(premerge, repo, mynode, orig, fcd, fco, fca, labels)
def extsetup(ui):
extensions.wrapfunction(filemerge, '_filemerge',
failfilemerge)