Mercurial > public > mercurial-scm > hg

annotate mercurial/mdiff.py @ 2859:345bac2bc4ec

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
update copyrights.
author Vadim Gelfer <vadim.gelfer@gmail.com>
date Sat, 12 Aug 2006 12:30:02 -0700
parents a20a1bb0c396
children 4ec58b157265
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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, 2006 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
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8 from demandload import demandload
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9 import bdiff, mpatch
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10 demandload(globals(), "re struct util")
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11
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12 def splitnewlines(text):
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13 '''like str.splitlines, but only split on newlines.'''
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14 lines = [l + '\n' for l in text.split('\n')]
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15 if lines:
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16 if lines[-1] == '\n':
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17 lines.pop()
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18 else:
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19 lines[-1] = lines[-1][:-1]
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20 return lines
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21
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22 def unidiff(a, ad, b, bd, fn, r=None, text=False,
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23 showfunc=False, ignorews=False, ignorewsamount=False,
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24 ignoreblanklines=False):
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26 if not a and not b: return ""
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27 epoch = util.datestr((0, 0))
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28
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29 if not text and (util.binary(a) or util.binary(b)):
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30 l = ['Binary file %s has changed\n' % fn]
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31 elif not a:
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32 b = splitnewlines(b)
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33 if a is None:
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34 l1 = "--- %s\t%s\n" % ("/dev/null", epoch)
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35 else:
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36 l1 = "--- %s\t%s\n" % ("a/" + fn, ad)
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37 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd)
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38 l3 = "@@ -0,0 +1,%d @@\n" % len(b)
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39 l = [l1, l2, l3] + ["+" + e for e in b]
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40 elif not b:
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41 a = splitnewlines(a)
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42 l1 = "--- %s\t%s\n" % ("a/" + fn, ad)
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43 if b is None:
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44 l2 = "+++ %s\t%s\n" % ("/dev/null", epoch)
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45 else:
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46 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd)
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47 l3 = "@@ -1,%d +0,0 @@\n" % len(a)
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48 l = [l1, l2, l3] + ["-" + e for e in a]
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49 else:
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50 al = splitnewlines(a)
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51 bl = splitnewlines(b)
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52 l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn,
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53 showfunc=showfunc, ignorews=ignorews,
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54 ignorewsamount=ignorewsamount,
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55 ignoreblanklines=ignoreblanklines))
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56 if not l: return ""
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57 # difflib uses a space, rather than a tab
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58 l[0] = "%s\t%s\n" % (l[0][:-2], ad)
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59 l[1] = "%s\t%s\n" % (l[1][:-2], bd)
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60
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61 for ln in xrange(len(l)):
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62 if l[ln][-1] != '\n':
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63 l[ln] += "\n\ No newline at end of file\n"
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64
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65 if r:
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66 l.insert(0, "diff %s %s\n" %
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67 (' '.join(["-r %s" % rev for rev in r]), fn))
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68
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69 return "".join(l)
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70
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71 # somewhat self contained replacement for difflib.unified_diff
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72 # t1 and t2 are the text to be diffed
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73 # l1 and l2 are the text broken up into lines
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74 # header1 and header2 are the filenames for the diff output
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75 # context is the number of context lines
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76 # showfunc enables diff -p output
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77 # ignorews ignores all whitespace changes in the diff
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78 # ignorewsamount ignores changes in the amount of whitespace
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79 # ignoreblanklines ignores changes whose lines are all blank
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80 def bunidiff(t1, t2, l1, l2, header1, header2, context=3, showfunc=False,
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81 ignorews=False, ignorewsamount=False, ignoreblanklines=False):
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82 def contextend(l, len):
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83 ret = l + context
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84 if ret > len:
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85 ret = len
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86 return ret
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87
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88 def contextstart(l):
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89 ret = l - context
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90 if ret < 0:
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91 return 0
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92 return ret
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93
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94 def yieldhunk(hunk, header):
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95 if header:
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96 for x in header:
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97 yield x
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98 (astart, a2, bstart, b2, delta) = hunk
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99 aend = contextend(a2, len(l1))
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100 alen = aend - astart
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101 blen = b2 - bstart + aend - a2
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102
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103 func = ""
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104 if showfunc:
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105 # walk backwards from the start of the context
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106 # to find a line starting with an alphanumeric char.
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107 for x in xrange(astart, -1, -1):
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108 t = l1[x].rstrip()
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109 if funcre.match(t):
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110 func = ' ' + t[:40]
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111 break
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112
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113 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen,
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114 bstart + 1, blen, func)
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115 for x in delta:
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116 yield x
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117 for x in xrange(a2, aend):
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118 yield ' ' + l1[x]
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119
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120 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ]
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121
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122 if showfunc:
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123 funcre = re.compile('\w')
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124 if ignorewsamount:
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125 wsamountre = re.compile('[ \t]+')
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126 wsappendedre = re.compile(' \n')
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127 if ignoreblanklines:
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128 wsblanklinesre = re.compile('\n')
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129 if ignorews:
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130 wsre = re.compile('[ \t]')
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131
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132 # bdiff.blocks gives us the matching sequences in the files. The loop
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133 # below finds the spaces between those matching sequences and translates
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134 # them into diff output.
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135 #
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136 diff = bdiff.blocks(t1, t2)
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diff changeset
137 hunk = None
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diff changeset
138 for i in xrange(len(diff)):
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139 # The first match is special.
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140 # we've either found a match starting at line 0 or a match later
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141 # in the file. If it starts later, old and new below will both be
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diff changeset
142 # empty and we'll continue to the next match.
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diff changeset
143 if i > 0:
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diff changeset
144 s = diff[i-1]
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145 else:
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146 s = [0, 0, 0, 0]
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147 delta = []
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148 s1 = diff[i]
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149 a1 = s[1]
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150 a2 = s1[0]
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diff changeset
151 b1 = s[3]
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152 b2 = s1[2]
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153
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154 old = l1[a1:a2]
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155 new = l2[b1:b2]
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156
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157 # bdiff sometimes gives huge matches past eof, this check eats them,
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158 # and deals with the special first match case described above
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159 if not old and not new:
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160 continue
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161
2580
a20a1bb0c396 diff: add -b/-B options
Haakon Riiser <haakon.riiser@fys.uio.no>
parents: 2470
diff changeset
162 if ignoreblanklines:
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163 wsold = wsblanklinesre.sub('', "".join(old))
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parents: 2470
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164 wsnew = wsblanklinesre.sub('', "".join(new))
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165 if wsold == wsnew:
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parents: 2470
diff changeset
166 continue
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diff changeset
167
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168 if ignorewsamount:
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169 wsold = wsamountre.sub(' ', "".join(old))
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170 wsold = wsappendedre.sub('\n', wsold)
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171 wsnew = wsamountre.sub(' ', "".join(new))
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172 wsnew = wsappendedre.sub('\n', wsnew)
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173 if wsold == wsnew:
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parents: 2470
diff changeset
174 continue
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diff changeset
175
1637
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176 if ignorews:
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177 wsold = wsre.sub('', "".join(old))
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178 wsnew = wsre.sub('', "".join(new))
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179 if wsold == wsnew:
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diff changeset
180 continue
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181
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182 astart = contextstart(a1)
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183 bstart = contextstart(b1)
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184 prev = None
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185 if hunk:
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186 # join with the previous hunk if it falls inside the context
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187 if astart < hunk[1] + context + 1:
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188 prev = hunk
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189 astart = hunk[1]
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190 bstart = hunk[3]
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191 else:
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192 for x in yieldhunk(hunk, header):
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diff changeset
193 yield x
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194 # we only want to yield the header if the files differ, and
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diff changeset
195 # we only want to yield it once.
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196 header = None
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197 if prev:
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198 # we've joined the previous hunk, record the new ending points.
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199 hunk[1] = a2
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200 hunk[3] = b2
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201 delta = hunk[4]
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diff changeset
202 else:
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diff changeset
203 # create a new hunk
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204 hunk = [ astart, a2, bstart, b2, delta ]
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diff changeset
205
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diff changeset
206 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ]
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207 delta[len(delta):] = [ '-' + x for x in old ]
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diff changeset
208 delta[len(delta):] = [ '+' + x for x in new ]
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diff changeset
209
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diff changeset
210 if hunk:
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diff changeset
211 for x in yieldhunk(hunk, header):
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diff changeset
212 yield x
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diff changeset
213
120
bae6f0328f63 Add a function to return the new text from a binary diff
mpm@selenic.com
parents: 75
diff changeset
214 def patchtext(bin):
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parents: 75
diff changeset
215 pos = 0
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parents: 75
diff changeset
216 t = []
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parents: 75
diff changeset
217 while pos < len(bin):
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diff changeset
218 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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diff changeset
219 pos += 12
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parents: 75
diff changeset
220 t.append(bin[pos:pos + l])
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diff changeset
221 pos += l
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parents: 75
diff changeset
222 return "".join(t)
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diff changeset
223
0
9117c6561b0b Add back links from file revisions to changeset revisions
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parents:
diff changeset
224 def patch(a, bin):
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8ee7ce877be2 Clean up mdiff imports
Matt Mackall <mpm@selenic.com>
parents: 1378
diff changeset
225 return mpatch.patches(a, [bin])
432
3b9e3d3d2810 Start using bdiff for generating deltas
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parents: 396
diff changeset
226
1379
8ee7ce877be2 Clean up mdiff imports
Matt Mackall <mpm@selenic.com>
parents: 1378
diff changeset
227 patches = mpatch.patches
2078
441ea218414e Fill in the uncompressed size during revlog.addgroup
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parents: 1723
diff changeset
228 patchedsize = mpatch.patchedsize
432
3b9e3d3d2810 Start using bdiff for generating deltas
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parents: 396
diff changeset
229 textdiff = bdiff.bdiff