view hgext/strip.py @ 45999:c4c7a6b61146

match: skip walking up the directory hierarchy if the number of pats are small

Previously, we would receive a path like abc/def/ghi and "walk up" the directory
hierarchy, checking abc/def, abc, and `b''` to see if they were in the set of
prefixes that this matcher covered. We did this indiscriminately - we generated
all of these paths even if the set of prefixes the matcher covered was
completely empty, which is the case for a lot of repos at my company (the narrow
matcher we use is usually non-recursive).

This brings the time for a rebase in one of my repos from 12.20s to 10.87s. In
this particular repo, this is entirely due to the `len(prefix_set) == 0` check,
as I do not have any recursive patterns in the narrowspec.

Differential Revision: https://phab.mercurial-scm.org/D9488

"""strip changesets and their descendants from history (DEPRECATED)

The functionality of this extension has been included in core Mercurial
since version 5.7. Please use :hg:`debugstrip ...` instead.

This extension allows you to strip changesets and all their descendants from the
repository. See the command help for details.
"""
from __future__ import absolute_import

from mercurial import commands

# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = b'ships-with-hg-core'

# This is a bit ugly, but a uisetup function that defines strip as an
# alias for debugstrip would override any user alias for strip,
# including aliases like "strip = strip --no-backup".
commands.command.rename(old=b'debugstrip', new=b'debugstrip|strip')