Mercurial > hg
annotate mercurial/similar.py @ 29925:1619efcde9a4
manifest: make one use of _mancache avoid manifestctxs
In a future patch we will change manifestctx and treemanifestctx to no longer
derive from manifestdict and treemanifest, respectively. This means that
consumers of the _mancache will now need to be aware of the different between
the two, until we get rid of the manifest entirely and the _mancache becomes
only filled with ctxs.
This fixes one case of it that can be fixed by using the other cache. Future
patches will address the others uses using the upcoming manifestctx.read()
function.
author | Durham Goode <durham@fb.com> |
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date | Mon, 12 Sep 2016 14:29:09 -0700 |
parents | 0d83ad967bf8 |
children | ada160a8cfd8 |
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 import hashlib |
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11 |
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12 from .i18n import _ |
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13 from . import ( |
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14 bdiff, |
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15 mdiff, |
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16 util, |
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17 ) |
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18 |
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19 def _findexactmatches(repo, added, removed): |
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20 '''find renamed files that have no changes |
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21 |
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22 Takes a list of new filectxs and a list of removed filectxs, and yields |
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23 (before, after) tuples of exact matches. |
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24 ''' |
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25 numfiles = len(added) + len(removed) |
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26 |
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27 # Get hashes of removed files. |
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28 hashes = {} |
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29 for i, fctx in enumerate(removed): |
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30 repo.ui.progress(_('searching for exact renames'), i, total=numfiles, |
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31 unit=_('files')) |
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32 h = hashlib.sha1(fctx.data()).digest() |
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33 hashes[h] = 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 h = hashlib.sha1(fctx.data()).digest() |
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40 if h in hashes: |
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41 yield (hashes[h], fctx) |
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42 |
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43 # Done |
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44 repo.ui.progress(_('searching for exact renames'), None) |
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45 |
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46 def _findsimilarmatches(repo, added, removed, threshold): |
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47 '''find potentially renamed files based on similar file content |
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48 |
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49 Takes a list of new filectxs and a list of removed filectxs, and yields |
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50 (before, after, score) tuples of partial matches. |
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51 ''' |
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52 copies = {} |
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53 for i, r in enumerate(removed): |
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55 total=len(removed), unit=_('files')) |
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56 |
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57 # lazily load text |
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58 @util.cachefunc |
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59 def data(): |
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60 orig = r.data() |
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61 return orig, mdiff.splitnewlines(orig) |
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62 |
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63 def score(text): |
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64 orig, lines = data() |
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65 # bdiff.blocks() returns blocks of matching lines |
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66 # count the number of bytes in each |
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67 equal = 0 |
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68 matches = bdiff.blocks(text, orig) |
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69 for x1, x2, y1, y2 in matches: |
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70 for line in lines[y1:y2]: |
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71 equal += len(line) |
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72 |
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73 lengths = len(text) + len(orig) |
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74 return equal * 2.0 / lengths |
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75 |
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76 for a in added: |
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77 bestscore = copies.get(a, (None, threshold))[1] |
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78 myscore = score(a.data()) |
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79 if myscore >= bestscore: |
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80 copies[a] = (r, myscore) |
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81 repo.ui.progress(_('searching'), None) |
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82 |
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83 for dest, v in copies.iteritems(): |
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84 source, score = v |
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85 yield source, dest, score |
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86 |
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87 def findrenames(repo, added, removed, threshold): |
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88 '''find renamed files -- yields (before, after, score) tuples''' |
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89 parentctx = repo['.'] |
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90 workingctx = repo[None] |
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91 |
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92 # Zero length files will be frequently unrelated to each other, and |
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93 # tracking the deletion/addition of such a file will probably cause more |
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94 # harm than good. We strip them out here to avoid matching them later on. |
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95 addedfiles = set([workingctx[fp] for fp in added |
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96 if workingctx[fp].size() > 0]) |
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97 removedfiles = set([parentctx[fp] for fp in removed |
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98 if fp in parentctx and parentctx[fp].size() > 0]) |
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99 |
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100 # Find exact matches. |
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101 for (a, b) in _findexactmatches(repo, |
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102 sorted(addedfiles), sorted(removedfiles)): |
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103 addedfiles.remove(b) |
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104 yield (a.path(), b.path(), 1.0) |
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105 |
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106 # If the user requested similar files to be matched, search for them also. |
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107 if threshold < 1.0: |
e6df01776e08
findrenames: Optimise "addremove -s100" by matching files by their SHA1 hashes.
David Greenaway <hg-dev@davidgreenaway.com>
parents:
11059
diff
changeset
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108 for (a, b, score) in _findsimilarmatches(repo, |
e6df01776e08
findrenames: Optimise "addremove -s100" by matching files by their SHA1 hashes.
David Greenaway <hg-dev@davidgreenaway.com>
parents:
11059
diff
changeset
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109 sorted(addedfiles), sorted(removedfiles), threshold): |
e6df01776e08
findrenames: Optimise "addremove -s100" by matching files by their SHA1 hashes.
David Greenaway <hg-dev@davidgreenaway.com>
parents:
11059
diff
changeset
|
110 yield (a.path(), b.path(), score) |