Mercurial > hg
view hgext/automv.py @ 44861:065421e12248
files: speed up `hg files` when no flags change display
It's not the first time I see slowness from this command slow down
tools built on top of hg.
The majority of the time is spent merely printing the result before
this change, which is clearly not how it should be (especially since
the computation of the result also looks slow).
Running `hg files` in mozilla-central:
parent revision: 1,260s
this commit: 0,683s
this commit without batching ui.write: 0,931s
this commit replacing the body of the loop with `pass`: 0,566s
This looks like a prime candidate for a rust fast path, but until
then, it seems reasonable to optimize the python.
Differential Revision: https://phab.mercurial-scm.org/D8586
author | Valentin Gatien-Baron <valentin.gatienbaron@gmail.com> |
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date | Tue, 26 May 2020 08:15:09 -0400 |
parents | 687b865b95ad |
children | 89a2afe31e82 |
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# automv.py # # Copyright 2013-2016 Facebook, Inc. # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. """check for unrecorded moves at commit time (EXPERIMENTAL) This extension checks at commit/amend time if any of the committed files comes from an unrecorded mv. The threshold at which a file is considered a move can be set with the ``automv.similarity`` config option. This option takes a percentage between 0 (disabled) and 100 (files must be identical), the default is 95. """ # Using 95 as a default similarity is based on an analysis of the mercurial # repositories of the cpython, mozilla-central & mercurial repositories, as # well as 2 very large facebook repositories. At 95 50% of all potential # missed moves would be caught, as well as correspond with 87% of all # explicitly marked moves. Together, 80% of moved files are 95% similar or # more. # # See http://markmail.org/thread/5pxnljesvufvom57 for context. from __future__ import absolute_import from mercurial.i18n import _ from mercurial import ( commands, copies, error, extensions, pycompat, registrar, scmutil, similar, ) configtable = {} configitem = registrar.configitem(configtable) configitem( b'automv', b'similarity', default=95, ) def extsetup(ui): entry = extensions.wrapcommand(commands.table, b'commit', mvcheck) entry[1].append( (b'', b'no-automv', None, _(b'disable automatic file move detection')) ) def mvcheck(orig, ui, repo, *pats, **opts): """Hook to check for moves at commit time""" opts = pycompat.byteskwargs(opts) renames = None disabled = opts.pop(b'no_automv', False) if not disabled: threshold = ui.configint(b'automv', b'similarity') if not 0 <= threshold <= 100: raise error.Abort(_(b'automv.similarity must be between 0 and 100')) if threshold > 0: match = scmutil.match(repo[None], pats, opts) added, removed = _interestingfiles(repo, match) uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True) renames = _findrenames( repo, uipathfn, added, removed, threshold / 100.0 ) with repo.wlock(): if renames is not None: scmutil._markchanges(repo, (), (), renames) return orig(ui, repo, *pats, **pycompat.strkwargs(opts)) def _interestingfiles(repo, matcher): """Find what files were added or removed in this commit. Returns a tuple of two lists: (added, removed). Only files not *already* marked as moved are included in the added list. """ stat = repo.status(match=matcher) added = stat.added removed = stat.removed copy = copies.pathcopies(repo[b'.'], repo[None], matcher) # remove the copy files for which we already have copy info added = [f for f in added if f not in copy] return added, removed def _findrenames(repo, uipathfn, added, removed, similarity): """Find what files in added are really moved files. Any file named in removed that is at least similarity% similar to a file in added is seen as a rename. """ renames = {} if similarity > 0: for src, dst, score in similar.findrenames( repo, added, removed, similarity ): if repo.ui.verbose: repo.ui.status( _(b'detected move of %s as %s (%d%% similar)\n') % (uipathfn(src), uipathfn(dst), score * 100) ) renames[dst] = src if renames: repo.ui.status(_(b'detected move of %d files\n') % len(renames)) return renames