upstream/mercurial-mirror Files · contrib/python-hook-examples.py

smartset: split generatorset classes to avoid cycle...

smartset: split generatorset classes to avoid cycle I uncovered a cycle manifesting in a memory leak by running `hgperfrevset '::tip'`. The cycle was due to generatorset.__init__ assigning a bound method to self.__contains__. Internet sleuthing revealed that assigning a bound method to an instance attribute always creates a cycle. This commit creates two new variants of generatorset for the special cases of ascending and descending generators. The special implementations of __contains__ have been extracted to these classes where they are defined as __contains__. generatorset now implements __new__ and changes the spawned type to one of the new classes if needed. Differential Revision: https://phab.mercurial-scm.org/D1780

Pulkit Goyal - - Load All Authors

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      '''

      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)))

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				'''
				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)))