annotate mercurial/similar.py @ 45326:99614011892b

commitctx: directly gather p1 and p2 copies in `files` The only thing we do with the p1copies and p2copies is to pass them around, we we can gather them later and directly stored them in the `ChangingFiles` object.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Sat, 25 Jul 2020 16:07:38 +0200
parents d783f945a701
children 89a2afe31e82
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 pycompat,
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14 )
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15
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16
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17 def _findexactmatches(repo, added, removed):
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18 '''find renamed files that have no changes
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19
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20 Takes a list of new filectxs and a list of removed filectxs, and yields
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21 (before, after) tuples of exact matches.
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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 progress = repo.ui.makeprogress(
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27 _(b'searching for exact renames'),
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28 total=(len(added) + len(removed)),
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29 unit=_(b'files'),
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30 )
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31 for fctx in removed:
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32 progress.increment()
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33 h = hash(fctx.data())
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34 if h not in hashes:
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35 hashes[h] = [fctx]
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36 else:
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37 hashes[h].append(fctx)
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38
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39 # For each added file, see if it corresponds to a removed file.
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40 for fctx in added:
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41 progress.increment()
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42 adata = fctx.data()
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43 h = hash(adata)
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44 for rfctx in hashes.get(h, []):
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45 # compare between actual file contents for exact identity
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46 if adata == rfctx.data():
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47 yield (rfctx, fctx)
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48 break
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49
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50 # Done
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51 progress.complete()
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52
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53
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54 def _ctxdata(fctx):
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55 # lazily load text
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56 orig = fctx.data()
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57 return orig, mdiff.splitnewlines(orig)
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58
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59
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60 def _score(fctx, otherdata):
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61 orig, lines = otherdata
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62 text = fctx.data()
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63 # mdiff.blocks() returns blocks of matching lines
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64 # count the number of bytes in each
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65 equal = 0
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66 matches = mdiff.blocks(text, orig)
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67 for x1, x2, y1, y2 in matches:
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68 for line in lines[y1:y2]:
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69 equal += len(line)
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70
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71 lengths = len(text) + len(orig)
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72 return equal * 2.0 / lengths
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73
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74
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75 def score(fctx1, fctx2):
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76 return _score(fctx1, _ctxdata(fctx2))
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77
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78
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79 def _findsimilarmatches(repo, added, removed, threshold):
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80 '''find potentially renamed files based on similar file content
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81
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82 Takes a list of new filectxs and a list of removed filectxs, and yields
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83 (before, after, score) tuples of partial matches.
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84 '''
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85 copies = {}
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86 progress = repo.ui.makeprogress(
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87 _(b'searching for similar files'), unit=_(b'files'), total=len(removed)
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88 )
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89 for r in removed:
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90 progress.increment()
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91 data = None
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92 for a in added:
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93 bestscore = copies.get(a, (None, threshold))[1]
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94 if data is None:
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95 data = _ctxdata(r)
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96 myscore = _score(a, data)
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97 if myscore > bestscore:
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98 copies[a] = (r, myscore)
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99 progress.complete()
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100
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101 for dest, v in pycompat.iteritems(copies):
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102 source, bscore = v
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103 yield source, dest, bscore
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104
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105
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106 def _dropempty(fctxs):
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107 return [x for x in fctxs if x.size() > 0]
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108
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109
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110 def findrenames(repo, added, removed, threshold):
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111 '''find renamed files -- yields (before, after, score) tuples'''
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112 wctx = repo[None]
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113 pctx = wctx.p1()
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114
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115 # Zero length files will be frequently unrelated to each other, and
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116 # tracking the deletion/addition of such a file will probably cause more
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117 # harm than good. We strip them out here to avoid matching them later on.
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118 addedfiles = _dropempty(wctx[fp] for fp in sorted(added))
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119 removedfiles = _dropempty(pctx[fp] for fp in sorted(removed) if fp in pctx)
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120
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121 # Find exact matches.
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122 matchedfiles = set()
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123 for (a, b) in _findexactmatches(repo, addedfiles, removedfiles):
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124 matchedfiles.add(b)
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125 yield (a.path(), b.path(), 1.0)
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126
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127 # If the user requested similar files to be matched, search for them also.
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128 if threshold < 1.0:
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d3e2af4e0128 similar: get rid of quadratic addedfiles.remove()
Yuya Nishihara <yuya@tcha.org>
parents: 31579
diff changeset
129 addedfiles = [x for x in addedfiles if x not in matchedfiles]
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 38395
diff changeset
130 for (a, b, score) in _findsimilarmatches(
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 38395
diff changeset
131 repo, addedfiles, removedfiles, threshold
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 38395
diff changeset
132 ):
11060
e6df01776e08 findrenames: Optimise "addremove -s100" by matching files by their SHA1 hashes.
David Greenaway <hg-dev@davidgreenaway.com>
parents: 11059
diff changeset
133 yield (a.path(), b.path(), score)