Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/mdiff.py @ 1265:979c04997448 0.7
Update doc for ssh URL, describing path handling more clearly.
author | Bryan O'Sullivan <bos@serpentine.com> |
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date | Fri, 16 Sep 2005 13:34:29 -0700 |
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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 |
432 | 8 import difflib, struct, bdiff |
9 from mpatch import * | |
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10 from util import * |
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11 |
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12 def unidiff(a, ad, b, bd, fn, r=None, text=False): |
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13 |
35 | 14 if not a and not b: return "" |
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15 |
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16 if not text and (binary(a) or binary(b)): |
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17 l = ['Binary file %s has changed\n' % fn] |
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18 elif a == None: |
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19 b = b.splitlines(1) |
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20 l1 = "--- %s\t%s\n" % ("/dev/null", ad) |
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21 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd) |
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22 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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23 l = [l1, l2, l3] + ["+" + e for e in b] |
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24 elif b == None: |
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25 a = a.splitlines(1) |
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26 l1 = "--- %s\t%s\n" % ("a/" + fn, ad) |
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27 l2 = "+++ %s\t%s\n" % ("/dev/null", bd) |
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28 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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29 l = [l1, l2, l3] + ["-" + e for e in a] |
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30 else: |
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31 a = a.splitlines(1) |
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32 b = b.splitlines(1) |
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33 l = list(difflib.unified_diff(a, b, "a/" + fn, "b/" + fn)) |
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34 if not l: return "" |
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35 # difflib uses a space, rather than a tab |
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36 l[0] = l[0][:-2] + "\t" + ad + "\n" |
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37 l[1] = l[1][:-2] + "\t" + bd + "\n" |
170 | 38 |
39 for ln in xrange(len(l)): | |
40 if l[ln][-1] != '\n': | |
41 l[ln] += "\n\ No newline at end of file\n" | |
42 | |
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43 if r: |
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44 l.insert(0, "diff %s %s\n" % |
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45 (' '.join(["-r %s" % rev for rev in r]), fn)) |
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46 |
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47 return "".join(l) |
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48 |
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49 def sortdiff(a, b): |
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50 la = lb = 0 |
325 | 51 lena = len(a) |
52 lenb = len(b) | |
515 | 53 |
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54 while 1: |
325 | 55 am, bm, = la, lb |
56 | |
57 # walk over matching lines | |
326 | 58 while lb < lenb and la < lena and a[la] == b[lb] : |
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59 la += 1 |
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60 lb += 1 |
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61 |
325 | 62 if la > am: |
63 yield (am, bm, la - am) # return a match | |
64 | |
65 # skip mismatched lines from b | |
361 | 66 while la < lena and lb < lenb and b[lb] < a[la]: |
325 | 67 lb += 1 |
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68 |
325 | 69 if lb >= lenb: |
70 break | |
515 | 71 |
325 | 72 # skip mismatched lines from a |
361 | 73 while la < lena and lb < lenb and b[lb] > a[la]: |
325 | 74 la += 1 |
75 | |
76 if la >= lena: | |
77 break | |
515 | 78 |
325 | 79 yield (lena, lenb, 0) |
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80 |
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81 def diff(a, b, sorted=0): |
325 | 82 if not a: |
83 s = "".join(b) | |
84 return s and (struct.pack(">lll", 0, 0, len(s)) + s) | |
85 | |
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86 bin = [] |
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87 p = [0] |
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88 for i in a: p.append(p[-1] + len(i)) |
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89 |
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90 if sorted: |
317 | 91 try: |
92 d = sortdiff(a, b) | |
93 except: | |
94 raise | |
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95 else: |
325 | 96 d = difflib.SequenceMatcher(None, a, b).get_matching_blocks() |
97 la = 0 | |
98 lb = 0 | |
99 for am, bm, size in d: | |
100 s = "".join(b[lb:bm]) | |
101 if am > la or s: | |
102 bin.append(struct.pack(">lll", p[la], p[am], len(s)) + s) | |
103 la = am + size | |
104 lb = bm + size | |
515 | 105 |
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106 return "".join(bin) |
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107 |
120
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108 def patchtext(bin): |
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109 pos = 0 |
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110 t = [] |
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111 while pos < len(bin): |
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112 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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113 pos += 12 |
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114 t.append(bin[pos:pos + l]) |
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115 pos += l |
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116 return "".join(t) |
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117 |
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118 def patch(a, bin): |
72 | 119 return patches(a, [bin]) |
432 | 120 |
121 textdiff = bdiff.bdiff | |
122 | |
123 |