Mercurial > hg
annotate mercurial/similar.py @ 28238:b57d45ec33b2
test: update test-bundle2-format.t comment
Now that bundle2 is used by default for all exchanges, this comment is obviously
out of date. Having deep testing of the API and expected behavior of the format
and its processing is still valuable, so the comment is updated.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Thu, 25 Feb 2016 10:34:31 +0100 |
parents | a56c47ed3885 |
children | 0d6b3630b9a3 |
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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 |
27359
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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 bdiff, |
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13 mdiff, |
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14 util, |
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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 numfiles = len(added) + len(removed) |
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24 |
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25 # Get hashes of removed files. |
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26 hashes = {} |
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27 for i, fctx in enumerate(removed): |
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28 repo.ui.progress(_('searching for exact renames'), i, total=numfiles) |
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29 h = util.sha1(fctx.data()).digest() |
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30 hashes[h] = fctx |
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31 |
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32 # For each added file, see if it corresponds to a removed file. |
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33 for i, fctx in enumerate(added): |
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34 repo.ui.progress(_('searching for exact renames'), i + len(removed), |
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35 total=numfiles) |
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36 h = util.sha1(fctx.data()).digest() |
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37 if h in hashes: |
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38 yield (hashes[h], fctx) |
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39 |
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40 # Done |
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41 repo.ui.progress(_('searching for exact renames'), None) |
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42 |
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43 def _findsimilarmatches(repo, added, removed, threshold): |
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44 '''find potentially renamed files based on similar file content |
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45 |
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46 Takes a list of new filectxs and a list of removed filectxs, and yields |
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47 (before, after, score) tuples of partial matches. |
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48 ''' |
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49 copies = {} |
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50 for i, r in enumerate(removed): |
16683 | 51 repo.ui.progress(_('searching for similar files'), i, |
52 total=len(removed)) | |
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53 |
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54 # lazily load text |
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55 @util.cachefunc |
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56 def data(): |
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57 orig = r.data() |
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58 return orig, mdiff.splitnewlines(orig) |
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59 |
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60 def score(text): |
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61 orig, lines = data() |
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62 # bdiff.blocks() returns blocks of matching lines |
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63 # count the number of bytes in each |
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64 equal = 0 |
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65 matches = bdiff.blocks(text, orig) |
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66 for x1, x2, y1, y2 in matches: |
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67 for line in lines[y1:y2]: |
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68 equal += len(line) |
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69 |
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70 lengths = len(text) + len(orig) |
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71 return equal * 2.0 / lengths |
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72 |
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73 for a in added: |
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74 bestscore = copies.get(a, (None, threshold))[1] |
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75 myscore = score(a.data()) |
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76 if myscore >= bestscore: |
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77 copies[a] = (r, myscore) |
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78 repo.ui.progress(_('searching'), None) |
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79 |
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80 for dest, v in copies.iteritems(): |
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81 source, score = v |
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82 yield source, dest, score |
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83 |
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84 def findrenames(repo, added, removed, threshold): |
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85 '''find renamed files -- yields (before, after, score) tuples''' |
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86 parentctx = repo['.'] |
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87 workingctx = repo[None] |
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88 |
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89 # Zero length files will be frequently unrelated to each other, and |
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90 # tracking the deletion/addition of such a file will probably cause more |
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91 # harm than good. We strip them out here to avoid matching them later on. |
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92 addedfiles = set([workingctx[fp] for fp in added |
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93 if workingctx[fp].size() > 0]) |
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94 removedfiles = set([parentctx[fp] for fp in removed |
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95 if fp in parentctx and parentctx[fp].size() > 0]) |
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96 |
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97 # Find exact matches. |
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98 for (a, b) in _findexactmatches(repo, |
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99 sorted(addedfiles), sorted(removedfiles)): |
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100 addedfiles.remove(b) |
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101 yield (a.path(), b.path(), 1.0) |
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102 |
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103 # If the user requested similar files to be matched, search for them also. |
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104 if threshold < 1.0: |
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105 for (a, b, score) in _findsimilarmatches(repo, |
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106 sorted(addedfiles), sorted(removedfiles), threshold): |
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107 yield (a.path(), b.path(), score) |
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108 |