annotate mercurial/similar.py @ 36309:94a1ff16f362

debuginstall: do not parse editor command in posix way on Windows An editor command is executed by a system shell, which is cmd.exe on Windows.
author Yuya Nishihara <yuya@tcha.org>
date Sat, 17 Feb 2018 13:13:04 +0900
parents ded48ad55146
children cd196be26cb7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # similar.py - mechanisms for finding similar files
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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 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 from .i18n import _
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11 from . import (
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12 mdiff,
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13 )
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14
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15 def _findexactmatches(repo, added, removed):
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16 '''find renamed files that have no changes
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17
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18 Takes a list of new filectxs and a list of removed filectxs, and yields
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19 (before, after) tuples of exact matches.
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20 '''
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21 numfiles = len(added) + len(removed)
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22
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23 # Build table of removed files: {hash(fctx.data()): [fctx, ...]}.
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24 # We use hash() to discard fctx.data() from memory.
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25 hashes = {}
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26 for i, fctx in enumerate(removed):
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27 repo.ui.progress(_('searching for exact renames'), i, total=numfiles,
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28 unit=_('files'))
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29 h = hash(fctx.data())
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30 if h not in hashes:
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31 hashes[h] = [fctx]
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32 else:
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33 hashes[h].append(fctx)
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34
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35 # For each added file, see if it corresponds to a removed file.
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36 for i, fctx in enumerate(added):
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37 repo.ui.progress(_('searching for exact renames'), i + len(removed),
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38 total=numfiles, unit=_('files'))
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39 adata = fctx.data()
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40 h = hash(adata)
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41 for rfctx in hashes.get(h, []):
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42 # compare between actual file contents for exact identity
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43 if adata == rfctx.data():
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44 yield (rfctx, fctx)
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45 break
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46
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47 # Done
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48 repo.ui.progress(_('searching for exact renames'), None)
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49
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50 def _ctxdata(fctx):
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51 # lazily load text
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52 orig = fctx.data()
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53 return orig, mdiff.splitnewlines(orig)
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54
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55 def _score(fctx, otherdata):
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56 orig, lines = otherdata
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57 text = fctx.data()
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58 # mdiff.blocks() returns blocks of matching lines
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59 # count the number of bytes in each
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60 equal = 0
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61 matches = mdiff.blocks(text, orig)
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62 for x1, x2, y1, y2 in matches:
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63 for line in lines[y1:y2]:
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64 equal += len(line)
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65
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66 lengths = len(text) + len(orig)
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67 return equal * 2.0 / lengths
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68
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69 def score(fctx1, fctx2):
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70 return _score(fctx1, _ctxdata(fctx2))
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71
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72 def _findsimilarmatches(repo, added, removed, threshold):
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73 '''find potentially renamed files based on similar file content
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74
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75 Takes a list of new filectxs and a list of removed filectxs, and yields
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76 (before, after, score) tuples of partial matches.
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77 '''
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78 copies = {}
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79 for i, r in enumerate(removed):
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80 repo.ui.progress(_('searching for similar files'), i,
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81 total=len(removed), unit=_('files'))
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82
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83 data = None
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84 for a in added:
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85 bestscore = copies.get(a, (None, threshold))[1]
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86 if data is None:
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87 data = _ctxdata(r)
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88 myscore = _score(a, data)
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89 if myscore > bestscore:
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90 copies[a] = (r, myscore)
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91 repo.ui.progress(_('searching'), None)
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92
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93 for dest, v in copies.iteritems():
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94 source, bscore = v
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95 yield source, dest, bscore
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96
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97 def _dropempty(fctxs):
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98 return [x for x in fctxs if x.size() > 0]
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99
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100 def findrenames(repo, added, removed, threshold):
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101 '''find renamed files -- yields (before, after, score) tuples'''
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102 wctx = repo[None]
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103 pctx = wctx.p1()
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104
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105 # Zero length files will be frequently unrelated to each other, and
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106 # tracking the deletion/addition of such a file will probably cause more
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107 # harm than good. We strip them out here to avoid matching them later on.
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108 addedfiles = _dropempty(wctx[fp] for fp in sorted(added))
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109 removedfiles = _dropempty(pctx[fp] for fp in sorted(removed) if fp in pctx)
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110
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111 # Find exact matches.
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112 matchedfiles = set()
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113 for (a, b) in _findexactmatches(repo, addedfiles, removedfiles):
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114 matchedfiles.add(b)
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115 yield (a.path(), b.path(), 1.0)
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116
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117 # If the user requested similar files to be matched, search for them also.
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118 if threshold < 1.0:
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119 addedfiles = [x for x in addedfiles if x not in matchedfiles]
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120 for (a, b, score) in _findsimilarmatches(repo, addedfiles,
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121 removedfiles, threshold):
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122 yield (a.path(), b.path(), score)