Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/mdiff.py @ 1444:f84ed9c6131d
fix for cloning empty repo (.hg is still empty)
author | Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
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date | Tue, 25 Oct 2005 14:55:39 -0700 |
parents | 8ee7ce877be2 |
children | f1755621cb7d |
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1 # mdiff.py - diff and patch routines for mercurial |
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2 # |
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3 # Copyright 2005 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 |
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6 # of the GNU General Public License, incorporated herein by reference. |
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7 |
1379 | 8 import difflib, struct, bdiff, util, mpatch |
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9 |
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10 def unidiff(a, ad, b, bd, fn, r=None, text=False): |
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11 |
35 | 12 if not a and not b: return "" |
1379 | 13 epoch = util.datestr((0, 0)) |
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14 |
1379 | 15 if not text and (util.binary(a) or util.binary(b)): |
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16 l = ['Binary file %s has changed\n' % fn] |
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17 elif a == None: |
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18 b = b.splitlines(1) |
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19 l1 = "--- %s\t%s\n" % ("/dev/null", epoch) |
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20 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd) |
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21 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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22 l = [l1, l2, l3] + ["+" + e for e in b] |
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23 elif b == None: |
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24 a = a.splitlines(1) |
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25 l1 = "--- %s\t%s\n" % ("a/" + fn, ad) |
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26 l2 = "+++ %s\t%s\n" % ("/dev/null", epoch) |
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27 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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28 l = [l1, l2, l3] + ["-" + e for e in a] |
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29 else: |
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30 a = a.splitlines(1) |
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31 b = b.splitlines(1) |
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32 l = list(difflib.unified_diff(a, b, "a/" + fn, "b/" + fn)) |
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33 if not l: return "" |
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34 # difflib uses a space, rather than a tab |
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35 l[0] = l[0][:-2] + "\t" + ad + "\n" |
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36 l[1] = l[1][:-2] + "\t" + bd + "\n" |
170 | 37 |
38 for ln in xrange(len(l)): | |
39 if l[ln][-1] != '\n': | |
40 l[ln] += "\n\ No newline at end of file\n" | |
41 | |
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42 if r: |
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43 l.insert(0, "diff %s %s\n" % |
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44 (' '.join(["-r %s" % rev for rev in r]), fn)) |
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45 |
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46 return "".join(l) |
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47 |
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48 def sortdiff(a, b): |
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49 la = lb = 0 |
325 | 50 lena = len(a) |
51 lenb = len(b) | |
515 | 52 |
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53 while 1: |
325 | 54 am, bm, = la, lb |
55 | |
56 # walk over matching lines | |
326 | 57 while lb < lenb and la < lena and a[la] == b[lb] : |
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58 la += 1 |
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59 lb += 1 |
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60 |
325 | 61 if la > am: |
62 yield (am, bm, la - am) # return a match | |
63 | |
64 # skip mismatched lines from b | |
361 | 65 while la < lena and lb < lenb and b[lb] < a[la]: |
325 | 66 lb += 1 |
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67 |
325 | 68 if lb >= lenb: |
69 break | |
515 | 70 |
325 | 71 # skip mismatched lines from a |
361 | 72 while la < lena and lb < lenb and b[lb] > a[la]: |
325 | 73 la += 1 |
74 | |
75 if la >= lena: | |
76 break | |
515 | 77 |
325 | 78 yield (lena, lenb, 0) |
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79 |
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80 def diff(a, b, sorted=0): |
325 | 81 if not a: |
82 s = "".join(b) | |
83 return s and (struct.pack(">lll", 0, 0, len(s)) + s) | |
84 | |
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85 bin = [] |
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86 p = [0] |
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87 for i in a: p.append(p[-1] + len(i)) |
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88 |
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89 if sorted: |
317 | 90 try: |
91 d = sortdiff(a, b) | |
92 except: | |
93 raise | |
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94 else: |
325 | 95 d = difflib.SequenceMatcher(None, a, b).get_matching_blocks() |
96 la = 0 | |
97 lb = 0 | |
98 for am, bm, size in d: | |
99 s = "".join(b[lb:bm]) | |
100 if am > la or s: | |
101 bin.append(struct.pack(">lll", p[la], p[am], len(s)) + s) | |
102 la = am + size | |
103 lb = bm + size | |
515 | 104 |
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105 return "".join(bin) |
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106 |
120
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107 def patchtext(bin): |
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108 pos = 0 |
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109 t = [] |
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110 while pos < len(bin): |
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111 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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112 pos += 12 |
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113 t.append(bin[pos:pos + l]) |
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114 pos += l |
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115 return "".join(t) |
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116 |
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117 def patch(a, bin): |
1379 | 118 return mpatch.patches(a, [bin]) |
432 | 119 |
1379 | 120 patches = mpatch.patches |
432 | 121 textdiff = bdiff.bdiff |
122 | |
123 |