mercurial/scmposix.py

match: introduce badmatch() to eliminate long callback chains with subrepos

Various bit of code replace the bad method on matchers, and then delegate to the
original bad method after doing some custom processing.  At least some of these
forget to restore the original method when the need has passed, and then when
the matcher is passed to the next subrepo (even a sibling), another layer is
added such that the chain looks like:

    bad2 -> bad1 -> original

At best, this is a waste of processing, but sometimes spurious messages can be
emitted (e.g. ccb1623266eb).

The trick with this copy of the matcher is to make sure it is *not* passed to
any subrepo- the original must be passed instead.

import sys, os
import osutil

def _rcfiles(path):
    rcs = [os.path.join(path, 'hgrc')]
    rcdir = os.path.join(path, 'hgrc.d')
    try:
        rcs.extend([os.path.join(rcdir, f)
                    for f, kind in osutil.listdir(rcdir)
                    if f.endswith(".rc")])
    except OSError:
        pass
    return rcs

def systemrcpath():
    path = []
    if sys.platform == 'plan9':
        root = 'lib/mercurial'
    else:
        root = 'etc/mercurial'
    # old mod_python does not set sys.argv
    if len(getattr(sys, 'argv', [])) > 0:
        p = os.path.dirname(os.path.dirname(sys.argv[0]))
        if p != '/':
            path.extend(_rcfiles(os.path.join(p, root)))
    path.extend(_rcfiles('/' + root))
    return path

def userrcpath():
    if sys.platform == 'plan9':
        return [os.environ['home'] + '/lib/hgrc']
    else:
        return [os.path.expanduser('~/.hgrc')]