match: add `filepath:` pattern to match an exact filepath relative to the root
It's useful in certain automated workflows to make sure we recurse in
directories whose name conflicts with files in other revisions.
In addition it makes it possible to avoid building a potentially costly regex,
improving performance when the set of files to match explicitly is large.
The benchmark below are run in the following configuration :
# data-env-vars.name = mozilla-central-2018-08-01-zstd-sparse-revlog
# benchmark.name = files
# benchmark.variants.rev = tip
# benchmark.variants.files = all-list-filepath-sorted
# bin-env-vars.hg.flavor = no-rust
It also includes timings using the re2 engine (through the `google-re2` module)
to show how much can be saved by just using a better regexp engine.
Pattern time (seconds) time using re2
-----------------------------------------------------------
just "." 0.4 0.4
list of "filepath:…" 1.3 1.3
list of "path:…" 25.7 3.9
list of patterns 29.7 10.4
As you can see, Without re2, using "filepath:" instead of "path:" is a huge
win. With re2, it is still about three times faster to not have to build the
regex.
#!/usr/bin/env python3
#
# mercurial - scalable distributed SCM
#
# Copyright 2005-2007 Olivia Mackall <olivia@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
import os
import sys
libdir = '@LIBDIR@'
if libdir != '@' 'LIBDIR' '@':
if not os.path.isabs(libdir):
libdir = os.path.join(
os.path.dirname(os.path.realpath(__file__)), libdir
)
libdir = os.path.abspath(libdir)
sys.path.insert(0, libdir)
# Make `pip install --user ...` packages available to the official Windows
# build. Most py2 packaging installs directly into the system python
# environment, so no changes are necessary for other platforms. The Windows
# py2 package uses py2exe, which lacks a `site` module. Hardcode it according
# to the documentation.
if getattr(sys, 'frozen', None) == 'console_exe':
vi = sys.version_info
appdata = os.environ.get('APPDATA')
if appdata:
sys.path.append(
os.path.join(
appdata,
'Python',
'Python%d%d' % (vi[0], vi[1]),
'site-packages',
)
)
try:
from hgdemandimport import tracing
except ImportError:
sys.stderr.write(
"abort: couldn't find mercurial libraries in [%s]\n"
% ' '.join(sys.path)
)
sys.stderr.write("(check your install and PYTHONPATH)\n")
sys.exit(-1)
with tracing.log('hg script'):
# enable importing on demand to reduce startup time
import hgdemandimport
hgdemandimport.enable()
from mercurial import dispatch
dispatch.run()