# interhg.py - interhg

#

# Copyright 2007 OHASHI Hideya <ohachige@gmail.com>

#

# Contributor(s):

#   Edward Lee <edward.lee@engineering.uiuc.edu>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

'''expand expressions into changelog and summaries

This extension allows the use of a special syntax in summaries, which

will be automatically expanded into links or any other arbitrary

expression, much like InterWiki does.

A few example patterns (link to bug tracking, etc.) that may be used

in your hgrc::

  [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>!

'''

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, *args, **kwargs):

    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, *args, **kwargs)

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