rust: exposing in parsers module
To build with the Rust code, set the HGWITHRUSTEXT
environment variable.
At this point, it's possible to instantiate and use
a rustlazyancestors object from a Python interpreter.
The changes in setup.py are obviously a quick hack,
just good enough to test/bench without much
refactoring. We'd be happy to improve on that with
help from the community.
Rust bindings crate gets compiled as a static library,
which in turn gets linked within 'parsers.so'
With respect to the plans at
https://www.mercurial-scm.org/wiki/OxidationPlan
this would probably qualify as "roll our own FFI".
Also, it doesn't quite meet the target of getting
rid of C code, since it brings actually more, yet:
- the new C code does nothing else than parsing
arguments and calling Rust functions.
In particular, there's no complex allocation involved.
- subsequent changes could rewrite more of revlog.c, this
time resulting in an overall decrease of C code and
unsafety.
#!/usr/bin/env python
#
# mercurial - scalable distributed SCM
#
# Copyright 2005-2007 Matt Mackall <mpm@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.
from __future__ import absolute_import
import os
import sys
if os.environ.get('HGUNICODEPEDANTRY', False):
try:
reload(sys)
sys.setdefaultencoding("undefined")
except NameError:
pass
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)
from hgdemandimport import tracing
with tracing.log('hg script'):
# enable importing on demand to reduce startup time
try:
if sys.version_info[0] < 3 or sys.version_info >= (3, 6):
import hgdemandimport; hgdemandimport.enable()
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)
from mercurial import dispatch
dispatch.run()