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# similar.py - mechanisms for finding similar files
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#
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from i18n import _
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import util
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import mdiff
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import bdiff
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def _findexactmatches(repo, added, removed):
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'''find renamed files that have no changes
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Takes a list of new filectxs and a list of removed filectxs, and yields
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(before, after) tuples of exact matches.
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'''
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numfiles = len(added) + len(removed)
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# Get hashes of removed files.
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hashes = {}
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for i, fctx in enumerate(removed):
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repo.ui.progress(_('searching for exact renames'), i, total=numfiles)
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h = util.sha1(fctx.data()).digest()
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hashes[h] = fctx
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# For each added file, see if it corresponds to a removed file.
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for i, fctx in enumerate(added):
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repo.ui.progress(_('searching for exact renames'), i + len(removed),
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total=numfiles)
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h = util.sha1(fctx.data()).digest()
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if h in hashes:
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yield (hashes[h], fctx)
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# Done
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repo.ui.progress(_('searching for exact renames'), None)
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def _findsimilarmatches(repo, added, removed, threshold):
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'''find potentially renamed files based on similar file content
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Takes a list of new filectxs and a list of removed filectxs, and yields
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(before, after, score) tuples of partial matches.
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'''
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copies = {}
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for i, r in enumerate(removed):
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repo.ui.progress(_('searching for similar files'), i, total=len(removed))
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# lazily load text
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@util.cachefunc
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def data():
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orig = r.data()
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return orig, mdiff.splitnewlines(orig)
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def score(text):
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orig, lines = data()
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# bdiff.blocks() returns blocks of matching lines
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# count the number of bytes in each
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equal = 0
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matches = bdiff.blocks(text, orig)
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for x1, x2, y1, y2 in matches:
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for line in lines[y1:y2]:
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equal += len(line)
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lengths = len(text) + len(orig)
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return equal * 2.0 / lengths
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for a in added:
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bestscore = copies.get(a, (None, threshold))[1]
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myscore = score(a.data())
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if myscore >= bestscore:
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copies[a] = (r, myscore)
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repo.ui.progress(_('searching'), None)
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for dest, v in copies.iteritems():
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source, score = v
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yield source, dest, score
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def findrenames(repo, added, removed, threshold):
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'''find renamed files -- yields (before, after, score) tuples'''
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parentctx = repo['.']
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workingctx = repo[None]
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# Zero length files will be frequently unrelated to each other, and
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# tracking the deletion/addition of such a file will probably cause more
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# harm than good. We strip them out here to avoid matching them later on.
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addedfiles = set([workingctx[fp] for fp in added
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if workingctx[fp].size() > 0])
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removedfiles = set([parentctx[fp] for fp in removed
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if fp in parentctx and parentctx[fp].size() > 0])
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# Find exact matches.
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for (a, b) in _findexactmatches(repo,
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sorted(addedfiles), sorted(removedfiles)):
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addedfiles.remove(b)
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yield (a.path(), b.path(), 1.0)
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# If the user requested similar files to be matched, search for them also.
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if threshold < 1.0:
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for (a, b, score) in _findsimilarmatches(repo,
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sorted(addedfiles), sorted(removedfiles), threshold):
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yield (a.path(), b.path(), score)
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