contrib/python-hook-examples.py

wireproto: only expose "between" to version 1 of wire protocols

We recently marked other legacy commands as only available to version 1
of the wire protocols. We held off marking "between" because it is
used as part of the SSH handshake.

Since SSH servers assume they are version 1 by default and the
"between" request that is issued as part of the version 2 handshake
is swallowed and not operated on, everything should "just work" if
"between" is not available to version 2.

Differential Revision: https://phab.mercurial-scm.org/D2513

'''
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)))