# filelog.py - file history class for mercurial## Copyright 2005-2007 Matt Mackall <mpm@selenic.com>## This software may be used and distributed according to the terms of the# GNU General Public License version 2, incorporated herein by reference. import revlog class filelog(revlog.revlog):    def __init__(self, opener, path):        revlog.revlog.__init__(self, opener,                        "/".join(("data", path + ".i")))     def read(self, node):        t = self.revision(node)        if not t.startswith('\1\n'):            return t        s = t.index('\1\n', 2)        return t[s+2:]     def _readmeta(self, node):        t = self.revision(node)        if not t.startswith('\1\n'):            return {}        s = t.index('\1\n', 2)        mt = t[2:s]        m = {}        for l in mt.splitlines():            k, v = l.split(": ", 1)            m[k] = v        return m     def add(self, text, meta, transaction, link, p1=None, p2=None):        if meta or text.startswith('\1\n'):            mt = ""            if meta:                mt = ["%s: %s\n" % (k, v) for k, v in meta.iteritems()]            text = "\1\n%s\1\n%s" % ("".join(mt), text)        return self.addrevision(text, transaction, link, p1, p2)     def renamed(self, node):        if self.parents(node)[0] != revlog.nullid:            return False        m = self._readmeta(node)        if m and "copy" in m:            return (m["copy"], revlog.bin(m["copyrev"]))        return False     def size(self, rev):        """return the size of a given revision"""         # for revisions with renames, we have to go the slow way        node = self.node(rev)        if self.renamed(node):            return len(self.read(node))         return revlog.revlog.size(self, rev)     def cmp(self, node, text):        """compare text with a given file revision"""         # for renames, we have to go the slow way        if self.renamed(node):            t2 = self.read(node)            return t2 != text         return revlog.revlog.cmp(self, node, text)