Mercurial > hg
annotate mercurial/similar.py @ 30920:dc9f086c7691
lock: move lock._host calculation to a function
This allows customization per platform. See the next patch for why.
author | Jun Wu <quark@fb.com> |
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date | Fri, 10 Feb 2017 13:35:21 -0800 |
parents | 8614546154cb |
children | e1d035905b2e |
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 ) |
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17 |
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18 def _findexactmatches(repo, added, removed): |
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19 '''find renamed files that have no changes |
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20 |
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21 Takes a list of new filectxs and a list of removed filectxs, and yields |
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22 (before, after) tuples of exact matches. |
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23 ''' |
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24 numfiles = len(added) + len(removed) |
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25 |
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26 # Get hashes of removed files. |
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27 hashes = {} |
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28 for i, fctx in enumerate(removed): |
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29 repo.ui.progress(_('searching for exact renames'), i, total=numfiles, |
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30 unit=_('files')) |
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31 h = hashlib.sha1(fctx.data()).digest() |
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32 hashes[h] = fctx |
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33 |
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34 # For each added file, see if it corresponds to a removed file. |
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35 for i, fctx in enumerate(added): |
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36 repo.ui.progress(_('searching for exact renames'), i + len(removed), |
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37 total=numfiles, unit=_('files')) |
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38 h = hashlib.sha1(fctx.data()).digest() |
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39 if h in hashes: |
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40 yield (hashes[h], fctx) |
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41 |
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42 # Done |
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43 repo.ui.progress(_('searching for exact renames'), None) |
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44 |
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45 def _ctxdata(fctx): |
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46 # lazily load text |
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47 orig = fctx.data() |
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48 return orig, mdiff.splitnewlines(orig) |
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49 |
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50 def _score(fctx, otherdata): |
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51 orig, lines = otherdata |
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52 text = fctx.data() |
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53 # bdiff.blocks() returns blocks of matching lines |
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54 # count the number of bytes in each |
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55 equal = 0 |
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56 matches = bdiff.blocks(text, orig) |
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57 for x1, x2, y1, y2 in matches: |
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58 for line in lines[y1:y2]: |
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59 equal += len(line) |
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60 |
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61 lengths = len(text) + len(orig) |
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62 return equal * 2.0 / lengths |
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63 |
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64 def score(fctx1, fctx2): |
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65 return _score(fctx1, _ctxdata(fctx2)) |
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66 |
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67 def _findsimilarmatches(repo, added, removed, threshold): |
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68 '''find potentially renamed files based on similar file content |
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69 |
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70 Takes a list of new filectxs and a list of removed filectxs, and yields |
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71 (before, after, score) tuples of partial matches. |
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72 ''' |
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73 copies = {} |
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74 for i, r in enumerate(removed): |
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76 total=len(removed), unit=_('files')) |
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77 |
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78 data = None |
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79 for a in added: |
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80 bestscore = copies.get(a, (None, threshold))[1] |
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81 if data is None: |
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82 data = _ctxdata(r) |
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83 myscore = _score(a, data) |
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84 if myscore >= bestscore: |
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85 copies[a] = (r, myscore) |
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86 repo.ui.progress(_('searching'), None) |
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87 |
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88 for dest, v in copies.iteritems(): |
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89 source, bscore = v |
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90 yield source, dest, bscore |
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91 |
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92 def findrenames(repo, added, removed, threshold): |
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93 '''find renamed files -- yields (before, after, score) tuples''' |
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94 parentctx = repo['.'] |
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95 workingctx = repo[None] |
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96 |
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97 # Zero length files will be frequently unrelated to each other, and |
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98 # tracking the deletion/addition of such a file will probably cause more |
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99 # harm than good. We strip them out here to avoid matching them later on. |
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100 addedfiles = set([workingctx[fp] for fp in added |
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101 if workingctx[fp].size() > 0]) |
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102 removedfiles = set([parentctx[fp] for fp in removed |
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103 if fp in parentctx and parentctx[fp].size() > 0]) |
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104 |
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105 # Find exact matches. |
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106 for (a, b) in _findexactmatches(repo, |
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107 sorted(addedfiles), sorted(removedfiles)): |
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108 addedfiles.remove(b) |
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11059
diff
changeset
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109 yield (a.path(), b.path(), 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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110 |
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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111 # If the user requested similar files to be matched, search for them also. |
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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112 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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113 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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114 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
|
115 yield (a.path(), b.path(), score) |