'''

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].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)))