contrib/python-hook-examples.py

releasenotes: don't abort is there is a bad formatted entry for releasenotes

While producing releasenotes for (4.3::), releasenotes aborts with error because
of some bad formatting of releasenotes in some commits. Instead of aborting,
this adds warning message which will help us in skipping them and telling user
about it.

Differential Revision: https://phab.mercurial-scm.org/D1097

'''
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['tip'].node()
    else:
        last = node
    diff = patch.diff(repo, first, last)
    ui.write(patch.diffstat(util.iterlines(diff)))