contrib/python-hook-examples.py

tests: adjust to the new format in pyflakes output

According to the pyflakes' NEWS.rst, the default output format changed
recently:

  2.2.0 (2020-04-08)
  - Include column information in error messages

So the lines now read:

  contrib/perf.py:149:15 undefined name 'xrange'
  mercurial/hgweb/server.py:427:13 undefined name 'reload'
  mercurial/util.py:2862:24 undefined name 'file'

This is a graft of a similar fix that ended up on default.

Differential Revision: https://phab.mercurial-scm.org/D8630

'''
Examples of useful python hooks for Mercurial.
'''
from __future__ import absolute_import
from mercurial import (
    patch,
    util,
)


def diffstat(ui, repo, **kwargs):
    '''Example usage:

    [hooks]
    commit.diffstat = python:/path/to/this/file.py:diffstat
    changegroup.diffstat = python:/path/to/this/file.py:diffstat
    '''
    if kwargs.get('parent2'):
        return
    node = kwargs['node']
    first = repo[node].p1().node()
    if 'url' in kwargs:
        last = repo.changelog.tip()
    else:
        last = node
    diff = patch.diff(repo, first, last)
    ui.write(patch.diffstat(util.iterlines(diff)))