mercurial/filelog.py
author Sune Foldager <cryo@cyanite.org>
Tue, 10 May 2011 17:38:58 +0200
changeset 14287 7c231754a621
parent 14074 e8271159c8c2
child 19148 3bda242bf244
permissions -rw-r--r--
filelog: add file function to open other filelogs
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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# filelog.py - file history class for mercurial
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#
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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import revlog
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import re
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_mdre = re.compile('\1\n')
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def _parsemeta(text):
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    """return (metadatadict, keylist, metadatasize)"""
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    # text can be buffer, so we can't use .startswith or .index
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    if text[:2] != '\1\n':
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        return None, None, None
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    s = _mdre.search(text, 2).start()
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    mtext = text[2:s]
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    meta = {}
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    keys = []
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    for l in mtext.splitlines():
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        k, v = l.split(": ", 1)
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        meta[k] = v
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        keys.append(k)
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    return meta, keys, (s + 2)
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def _packmeta(meta, keys=None):
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    if not keys:
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        keys = sorted(meta.iterkeys())
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    return "".join("%s: %s\n" % (k, meta[k]) for k in keys)
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class filelog(revlog.revlog):
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    def __init__(self, opener, path):
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        revlog.revlog.__init__(self, opener,
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                        "/".join(("data", path + ".i")))
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    def read(self, node):
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        t = self.revision(node)
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        if not t.startswith('\1\n'):
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            return t
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        s = t.index('\1\n', 2)
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        return t[s + 2:]
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    def add(self, text, meta, transaction, link, p1=None, p2=None):
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        if meta or text.startswith('\1\n'):
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            text = "\1\n%s\1\n%s" % (_packmeta(meta), text)
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        return self.addrevision(text, transaction, link, p1, p2)
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    def renamed(self, node):
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        if self.parents(node)[0] != revlog.nullid:
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            return False
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        t = self.revision(node)
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        m = _parsemeta(t)[0]
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        if m and "copy" in m:
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            return (m["copy"], revlog.bin(m["copyrev"]))
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        return False
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    def size(self, rev):
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        """return the size of a given revision"""
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        # for revisions with renames, we have to go the slow way
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        node = self.node(rev)
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        if self.renamed(node):
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            return len(self.read(node))
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        # XXX if self.read(node).startswith("\1\n"), this returns (size+4)
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        return revlog.revlog.size(self, rev)
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    def cmp(self, node, text):
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        """compare text with a given file revision
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        returns True if text is different than what is stored.
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        """
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        t = text
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        if text.startswith('\1\n'):
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            t = '\1\n\1\n' + text
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        samehashes = not revlog.revlog.cmp(self, node, t)
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        if samehashes:
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            return False
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        # renaming a file produces a different hash, even if the data
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        # remains unchanged. Check if it's the case (slow):
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        if self.renamed(node):
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            t2 = self.read(node)
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            return t2 != text
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        return True
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    def _file(self, f):
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        return filelog(self.opener, f)