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# automv.py
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#
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# Copyright 2013-2016 Facebook, Inc.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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"""Check for unrecorded moves at commit time (EXPERIMENTAL)
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This extension checks at commit/amend time if any of the committed files
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comes from an unrecorded mv.
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The threshold at which a file is considered a move can be set with the
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``automv.similarity`` config option. This option takes a percentage between 0
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(disabled) and 100 (files must be identical), the default is 95.
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"""
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# Using 95 as a default similarity is based on an analysis of the mercurial
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# repositories of the cpython, mozilla-central & mercurial repositories, as
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# well as 2 very large facebook repositories. At 95 50% of all potential
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# missed moves would be caught, as well as correspond with 87% of all
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# explicitly marked moves. Together, 80% of moved files are 95% similar or
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# more.
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#
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# See http://markmail.org/thread/5pxnljesvufvom57 for context.
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from __future__ import absolute_import
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from mercurial import (
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commands,
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copies,
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error,
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extensions,
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scmutil,
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similar
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)
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from mercurial.i18n import _
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def extsetup(ui):
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entry = extensions.wrapcommand(
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commands.table, 'commit', mvcheck)
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entry[1].append(
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('', 'no-automv', None,
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_('disable automatic file move detection')))
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def mvcheck(orig, ui, repo, *pats, **opts):
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"""Hook to check for moves at commit time"""
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renames = None
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disabled = opts.pop('no_automv', False)
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if not disabled:
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threshold = ui.configint('automv', 'similarity', 95)
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if not 0 <= threshold <= 100:
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raise error.Abort(_('automv.similarity must be between 0 and 100'))
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if threshold > 0:
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match = scmutil.match(repo[None], pats, opts)
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added, removed = _interestingfiles(repo, match)
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renames = _findrenames(repo, match, added, removed,
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threshold / 100.0)
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with repo.wlock():
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if renames is not None:
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scmutil._markchanges(repo, (), (), renames)
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return orig(ui, repo, *pats, **opts)
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def _interestingfiles(repo, matcher):
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"""Find what files were added or removed in this commit.
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Returns a tuple of two lists: (added, removed). Only files not *already*
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marked as moved are included in the added list.
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"""
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stat = repo.status(match=matcher)
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added = stat[1]
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removed = stat[2]
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copy = copies._forwardcopies(repo['.'], repo[None], matcher)
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# remove the copy files for which we already have copy info
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added = [f for f in added if f not in copy]
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return added, removed
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def _findrenames(repo, matcher, added, removed, similarity):
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"""Find what files in added are really moved files.
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Any file named in removed that is at least similarity% similar to a file
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in added is seen as a rename.
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"""
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renames = {}
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if similarity > 0:
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for src, dst, score in similar.findrenames(
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repo, added, removed, similarity):
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if repo.ui.verbose:
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repo.ui.status(
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_('detected move of %s as %s (%d%% similar)\n') % (
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matcher.rel(src), matcher.rel(dst), score * 100))
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renames[dst] = src
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if renames:
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repo.ui.status(_('detected move of %d files\n') % len(renames))
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return renames
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