Mercurial > hg
annotate mercurial/similar.py @ 45849:731ea8fa1f11 stable
chg: show debug message for each fd to be closed
It helps debugging. The number of file descriptors should be small in most
cases, so the console output wouldn't get bloated even with CHG_DEBUG=1.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Tue, 03 Nov 2020 11:12:25 +0900 |
parents | d783f945a701 |
children | 89a2afe31e82 |
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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129 addedfiles = [x for x in addedfiles if x not in matchedfiles] |
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130 for (a, b, score) in _findsimilarmatches( |
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131 repo, addedfiles, removedfiles, threshold |
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132 ): |
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133 yield (a.path(), b.path(), score) |