tests/failfilemerge.py

byteify-strings: fork py3 code transformer to make it a standalone command

I'm thinking of making a one-off s/''/b''/g change for overall codebase to
make linter happy. We could do that without maintaining the script, but I
think it will be somewhat useful for extension authors. So it is in contrib.

# extension to emulate interrupting filemerge._filemerge

from __future__ import absolute_import

from mercurial import (
    error,
    extensions,
    filemerge,
)

def failfilemerge(filemergefn,
                  premerge, repo, wctx, 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)