'''
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)))

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