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annotate mercurial/mdiff.py @ 278:777e388c06d6

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unidiff: handle empty diffs more gracefully -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 unidiff: handle empty diffs more gracefully manifest hash: e2030f7e55dc333ba0cd5b0847d1f1a08e3c5d64 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) iD8DBQFCpz0uywK+sNU5EO8RAnt4AJ9pyaS6/xNnlhCUocq3m0HbCwHJ/gCgrP/H IvBJtq1eXvRedfitF25vBgw= =pd5n -----END PGP SIGNATURE-----
author mpm@selenic.com
date Wed, 08 Jun 2005 10:47:10 -0800
parents 467cea2bf2d8
children b18ce742566a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
249
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8 import difflib, struct
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9 from mercurial.mpatch import *
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10
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11 def unidiff(a, ad, b, bd, fn):
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12 if not a and not b: return ""
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13
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14 if a == None:
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15 b = b.splitlines(1)
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16 l1 = "--- %s\t%s\n" % ("/dev/null", ad)
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17 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd)
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18 l3 = "@@ -0,0 +1,%d @@\n" % len(b)
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19 l = [l1, l2, l3] + ["+" + e for e in b]
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20 elif b == None:
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21 a = a.splitlines(1)
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22 l1 = "--- %s\t%s\n" % ("a/" + fn, ad)
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23 l2 = "+++ %s\t%s\n" % ("/dev/null", bd)
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24 l3 = "@@ -1,%d +0,0 @@\n" % len(a)
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25 l = [l1, l2, l3] + ["-" + e for e in a]
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26 else:
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27 a = a.splitlines(1)
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28 b = b.splitlines(1)
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29 l = list(difflib.unified_diff(a, b, "a/" + fn, "b/" + fn))
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30 if not l: return ""
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31 # difflib uses a space, rather than a tab
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32 l[0] = l[0][:-2] + "\t" + ad + "\n"
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33 l[1] = l[1][:-2] + "\t" + bd + "\n"
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34
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35 for ln in xrange(len(l)):
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36 if l[ln][-1] != '\n':
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37 l[ln] += "\n\ No newline at end of file\n"
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38
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39 return "".join(l)
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40
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41 def textdiff(a, b):
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42 return diff(a.splitlines(1), b.splitlines(1))
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43
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44 def sortdiff(a, b):
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45 la = lb = 0
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46 lena = len(a)
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47 lenb = len(b)
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48 while 1:
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49 am, bm, = la, lb
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50 while lb < lenb and la < len and a[la] == b[lb] :
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51 la += 1
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52 lb += 1
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53 if la>am: yield (am, bm, la-am)
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54 while lb < lenb and b[lb] < a[la]: lb += 1
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55 if lb>=lenb: break
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56 while la < lena and b[lb] > a[la]: la += 1
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57 if la>=lena: break
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58 yield (lena, lenb, 0)
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59
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60 def diff(a, b, sorted=0):
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61 if not a:
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62 s = "".join(b)
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63 return s and (struct.pack(">lll", 0, 0, len(s)) + s)
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64
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65 bin = []
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66 p = [0]
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67 for i in a: p.append(p[-1] + len(i))
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68
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69 if sorted:
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70 d = sortdiff(a, b)
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71 else:
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72 d = difflib.SequenceMatcher(None, a, b).get_matching_blocks()
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73 la = 0
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74 lb = 0
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75 for am, bm, size in d:
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76 s = "".join(b[lb:bm])
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77 if am > la or s:
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78 bin.append(struct.pack(">lll", p[la], p[am], len(s)) + s)
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79 la = am + size
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80 lb = bm + size
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81
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82 return "".join(bin)
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83
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84 def patchtext(bin):
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85 pos = 0
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86 t = []
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87 while pos < len(bin):
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88 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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89 pos += 12
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90 t.append(bin[pos:pos + l])
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91 pos += l
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92 return "".join(t)
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93
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94 def patch(a, bin):
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95 return patches(a, [bin])