view hgext/automv.py @ 51807:0b2c978f595f

largefiles: sync up `largefilesdirstate` methods with `dirstate` base class

As it currently stands, pytype infers the `dirstate` class (and anything else
decorated with `@interfaceutil.implementer`) as `Any`.  When that is worked
around, it suddenly noticed that most of these methods don't exist in the
`dirstate` class anymore.  Since they only called into the missing methods and
there's no test failures, we can assume these are never called, and they can be
dropped.

In addition, PyCharm flagged `set_tracked()` and `_ignore()` as not overriding
a superclass method with the same arguments.  The missing default parameter for
the former was the obvious issue.  I'm guessing that the latter was named wrong
because while there is `_ignore()` in the base class, it takes no arguments and
returns a matcher.  The `_ignorefiles()` superclass method also takes no args,
and returns a list of bytes.  The `_ignorefileandline()` superclass method DOES
take a file, but returns a tuple.  Therefore, the closest match is `_dirignore()`,
which takes a file AND returns a bool.  No idea why this needs to be overridden
though.

# 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 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"""
    renames = None
    disabled = opts.pop('no_automv', False)
    with repo.wlock():
        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, pycompat.byteskwargs(opts)
                )
                added, removed = _interestingfiles(repo, match)
                uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
                renames = _findrenames(
                    repo, uipathfn, added, removed, threshold / 100.0
                )

        if renames is not None:
            with repo.dirstate.changing_files(repo):
                # XXX this should be wider and integrated with the commit
                # transaction. At the same time as we do the `addremove` logic
                # for commit.  However we can't really do better with the
                # current extension structure, and this is not worse than what
                # happened before.
                scmutil._markchanges(repo, (), (), renames)
        return orig(ui, repo, *pats, **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