tests/revnamesext.py

error: ensure ProgrammingError message is always a str

Since this error is internal-only and a runtime error, let's give it a
treatment that makes it behave identically when repr()d on both Python
2 and Python 3.

Differential Revision: https://phab.mercurial-scm.org/D4545

# 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)