|
1 # filelog.py - file history class for mercurial |
|
2 # |
|
3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
|
4 # |
|
5 # This software may be used and distributed according to the terms of the |
|
6 # GNU General Public License version 2 or any later version. |
|
7 |
|
8 import revlog |
|
9 |
|
10 class filelog(revlog.revlog): |
|
11 def __init__(self, opener, path): |
|
12 revlog.revlog.__init__(self, opener, |
|
13 "/".join(("data", path + ".i"))) |
|
14 |
|
15 def read(self, node): |
|
16 t = self.revision(node) |
|
17 if not t.startswith('\1\n'): |
|
18 return t |
|
19 s = t.index('\1\n', 2) |
|
20 return t[s + 2:] |
|
21 |
|
22 def _readmeta(self, node): |
|
23 t = self.revision(node) |
|
24 if not t.startswith('\1\n'): |
|
25 return {} |
|
26 s = t.index('\1\n', 2) |
|
27 mt = t[2:s] |
|
28 m = {} |
|
29 for l in mt.splitlines(): |
|
30 k, v = l.split(": ", 1) |
|
31 m[k] = v |
|
32 return m |
|
33 |
|
34 def add(self, text, meta, transaction, link, p1=None, p2=None): |
|
35 if meta or text.startswith('\1\n'): |
|
36 mt = ["%s: %s\n" % (k, v) for k, v in sorted(meta.iteritems())] |
|
37 text = "\1\n%s\1\n%s" % ("".join(mt), text) |
|
38 return self.addrevision(text, transaction, link, p1, p2) |
|
39 |
|
40 def renamed(self, node): |
|
41 if self.parents(node)[0] != revlog.nullid: |
|
42 return False |
|
43 m = self._readmeta(node) |
|
44 if m and "copy" in m: |
|
45 return (m["copy"], revlog.bin(m["copyrev"])) |
|
46 return False |
|
47 |
|
48 def size(self, rev): |
|
49 """return the size of a given revision""" |
|
50 |
|
51 # for revisions with renames, we have to go the slow way |
|
52 node = self.node(rev) |
|
53 if self.renamed(node): |
|
54 return len(self.read(node)) |
|
55 |
|
56 # XXX if self.read(node).startswith("\1\n"), this returns (size+4) |
|
57 return revlog.revlog.size(self, rev) |
|
58 |
|
59 def cmp(self, node, text): |
|
60 """compare text with a given file revision |
|
61 |
|
62 returns True if text is different than what is stored. |
|
63 """ |
|
64 |
|
65 t = text |
|
66 if text.startswith('\1\n'): |
|
67 t = '\1\n\1\n' + text |
|
68 |
|
69 samehashes = not revlog.revlog.cmp(self, node, t) |
|
70 if samehashes: |
|
71 return False |
|
72 |
|
73 # renaming a file produces a different hash, even if the data |
|
74 # remains unchanged. Check if it's the case (slow): |
|
75 if self.renamed(node): |
|
76 t2 = self.read(node) |
|
77 return t2 != text |
|
78 |
|
79 return True |