'''

Examples of useful python hooks for Mercurial.

'''

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].parents()[0].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)))