from mercurial import hg, filelog, revlog, context, util

import os.path, re

def reposetup(ui, repo):

    if not repo.local():

        return

    class kwrepo(repo.__class__):

        def file(self, f):

            if f[0] == '/':

                f = f[1:]

            return filelog.filelog(self.sopener, f, self, self.revlogversion)

    class kwfilelog(filelog.filelog):

        def __init__(self, opener, path, repo,

                     defversion=revlog.REVLOG_DEFAULT_VERSION):

            super(kwfilelog, self).__init__(opener, path, defversion)

            self._repo = repo

            self._path = path

        def read(self, node):

            def gethgkw():

                c = context.filectx(self._repo, self._path, fileid=node,

                                     filelog=self)

                filename = c.path()

                for pat, opt in self._repo.ui.configitems('keyword'):

                    if opt == 'expand':

                        mf = util.matcher(self._repo.root,

                                '', [pat], [], [])[1]

                        if mf(filename):

                            return '$Hg: %s,v %s %s %s $' % (

                                    os.path.basename(filename),

                                    c.changectx(),

                                    util.datestr(date=c.date(),

                                        format=util.defaultdateformats[0]),

                                    util.shortuser(c.user())

                                    )

            data = super(kwfilelog, self).read(node)

            if not util.binary(data):

                hgkw = gethgkw()

                if hgkw:

                    data = data.replace('$Hg$', hgkw)

            return data

        def add(self, text, meta, tr, link, p1=None, p2=None):

            if (not util.binary(text) and

                   self._repo.ui.config('keyword', 'remove', True)):

                text = re.sub(r'\$Hg[^$]*?\$', '$Hg$', text)

            return super(kwfilelog, self).add(text, meta, tr, link, p1, p2)

    filelog.filelog = kwfilelog

    repo.__class__ = kwrepo