hgext/interhg.py

dirstate: skip step 3 in walk if nothing new will match

nothing will ever match on match.never
nothing new will match on match.exact (all found in step 1)
nothing new will match on match.match when
  there is no pattern and
  there is no direcory in pats

# interhg.py - interhg
#
# Copyright 2007 OHASHI Hideya <[e-mail]>
#
# Contributor(s):
#   Edward Lee <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
#
# The `interhg' Mercurial extension allows you to change changelog and
# summary text just like InterWiki way.
#
# To enable this extension:
#
#   [extensions]
#   interhg =
#
# These are some example patterns (link to bug tracking, etc.)
#
#   [interhg]
#   issues = s!issue(\d+)!<a href="http://bts/issue\1">issue\1<\/a>!
#   bugzilla = s!((?:bug|b=|(?=#?\d{4,}))(?:\s*#?)(\d+))!<a..=\2">\1</a>!i
#   boldify = s/(^|\s)#(\d+)\b/ <b>#\2<\/b>/
#
# Add any number of names and patterns to match

import re
from mercurial.hgweb import hgweb_mod
from mercurial import templatefilters, extensions
from mercurial.i18n import _

orig_escape = templatefilters.filters["escape"]

interhg_table = []

def interhg_escape(x):
    escstr = orig_escape(x)
    for regexp, format in interhg_table:
        escstr = regexp.sub(format, escstr)
    return escstr

templatefilters.filters["escape"] = interhg_escape

def interhg_refresh(orig, self):
    interhg_table[:] = []
    for key, pattern in self.repo.ui.configitems('interhg'):
        # grab the delimiter from the character after the "s"
        unesc = pattern[1]
        delim = re.escape(unesc)

        # identify portions of the pattern, taking care to avoid escaped
        # delimiters. the replace format and flags are optional, but delimiters
        # are required.
        match = re.match(r'^s%s(.+)(?:(?<=\\\\)|(?<!\\))%s(.*)%s([ilmsux])*$'
                         % (delim, delim, delim), pattern)
        if not match:
            self.repo.ui.warn(_("interhg: invalid pattern for %s: %s\n")
                              % (key, pattern))
            continue

        # we need to unescape the delimiter for regexp and format
        delim_re = re.compile(r'(?<!\\)\\%s' % delim)
        regexp = delim_re.sub(unesc, match.group(1))
        format = delim_re.sub(unesc, match.group(2))

        # the pattern allows for 6 regexp flags, so set them if necessary
        flagin = match.group(3)
        flags = 0
        if flagin:
            for flag in flagin.upper():
                flags |= re.__dict__[flag]

        try:
            regexp = re.compile(regexp, flags)
            interhg_table.append((regexp, format))
        except re.error:
            self.repo.ui.warn(_("interhg: invalid regexp for %s: %s\n")
                              % (key, regexp))
    return orig(self)

extensions.wrapfunction(hgweb_mod.hgweb, 'refresh', interhg_refresh)