contrib/python-hook-examples.py

tests: skip some tests when using simple store

generaldelta is a revlog implementation detail. We don't need to
test it with the simple store.

union repos are heavily revlog based. It should be possible to
run them with alternate stores. But it's not worth the trouble
at this juncture.

Differential Revision: https://phab.mercurial-scm.org/D3040

'''
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)))