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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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def _parsemeta(text):
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if not text.startswith('\1\n'):
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return {}
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s = text.index('\1\n', 2)
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mt = text[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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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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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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t = self.revision(node)
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m = _parsemeta(t)
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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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