contrib/python-hook-examples.py

pull: deal with locally filtered changeset passed into --rev

Nowadays, it is possible to explicitly pull a remote revision that end up being
hidden locally (eg: obsoleted locally). However before this patch, some
internal processing where crashing trying to resolve a filtered revision.

Without this patches, the pull output result a confusing output:

  $ hg pull ../repo-Bob --rev 956063ac4557
  pulling from ../repo-Bob
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 0 changes to 2 files (+1 heads)
  (2 other changesets obsolete on arrival)
  abort: 00changelog.i@956063ac4557828781733b2d5677a351ce856f59: filtered node!

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