from mercurial import hg, filelog, revlog, context, util
import os.path, re

hgkeywords = 'Id|Header|Author|Date|Revision|RCSFile|Source'

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):
            data = super(kwfilelog, self).read(node)
            if not util.binary(data):
                c = context.filectx(self._repo, self._path, fileid=node,
                                     filelog=self)
                f = c.path()
                for pat, opt in self._repo.ui.configitems('keyword'):
                    if opt == 'expand':
                        mf = util.matcher(self._repo.root,
                                '', [pat], [], [])[1]
                        if mf(f):
                            re_kw = re.compile(r'\$(%s)\$' % hgkeywords)

                            def kwexpand(matchobj):
                                RCSFile = os.path.basename(f)+',v'
                                Source = os.path.join(self._repo.root, f)+',v'
                                Revision = c.changectx()
                                Date = util.datestr(date=c.date())
                                Author = c.user()
                                revdateauth = '%s %s %s' % (
                                        Revision,
                                        util.datestr(date=c.date(),
                                            format=util.defaultdateformats[0]),
                                        util.shortuser(Author))
                                Header = '%s %s' % (Source, revdateauth)
                                Id = '%s %s' % (RCSFile, revdateauth)
                                return '$%s: %s $' % (
                                        matchobj.group(1), eval(matchobj.group(1)))

                            return re_kw.sub(kwexpand, data)
            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)):
                re_kw = re.compile(r'\$(%s): [^$]+? \$' % hgkeywords)
                text = re_kw.sub(r'$\1$', text)
            return super(kwfilelog, self).add(text, meta, tr, link, p1, p2)

    filelog.filelog = kwfilelog
    repo.__class__ = kwrepo