mercurial/filelog.py
author Nicolas Dumazet <nicdumz.commits@gmail.com>
Fri, 09 Jul 2010 11:02:39 +0900
branchstable
changeset 11539 a463e3c50212
parent 10706 d8d1b56d4519
child 11540 2370e270a29a
permissions -rw-r--r--
cmp: document the fact that we return True if content is different This is similar to the __builtin__.cmp behaviour, but still not straightforward, as the dailylife meaning of a comparison usually is "find out if they are different".
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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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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 _readmeta(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 {}
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        s = t.index('\1\n', 2)
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        mt = t[2:s]
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        m = {}
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        for l in mt.splitlines():
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            k, v = l.split(": ", 1)
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            m[k] = v
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        return m
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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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            mt = ["%s: %s\n" % (k, v) for k, v in sorted(meta.iteritems())]
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            text = "\1\n%s\1\n%s" % ("".join(mt), 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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        m = self._readmeta(node)
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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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        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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        # for renames, we have to go the slow way
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        if text.startswith('\1\n') or self.renamed(node):
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            t2 = self.read(node)
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            return t2 != text
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        return revlog.revlog.cmp(self, node, text)