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