Mercurial > public > mercurial-scm > hg

annotate mercurial/mdiff.py @ 4103:544838cc1158

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Don't lie that "binary file has changed" Without -a option to "hg diff", mdiff.unidiff reported that "Binary file foo has changed" without even trying to compare things. Now it computes MD5 of old and new files, compares them and makes the conclusion.
author tailgunner@smtp.ru
date Sat, 17 Feb 2007 09:54:56 -0200
parents 096f1c73cdc3
children 226df1808f16
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
239
75840796e8e2 mdiff.py: kill #! line, add copyright notice
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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 md5")
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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 class diffopts(object):
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23 '''context is the number of context lines
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24 text treats all files as text
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25 showfunc enables diff -p output
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26 git enables the git extended patch format
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27 nodates removes dates from diff headers
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28 ignorews ignores all whitespace changes in the diff
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29 ignorewsamount ignores changes in the amount of whitespace
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30 ignoreblanklines ignores changes whose lines are all blank'''
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31
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32 defaults = {
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33 'context': 3,
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34 'text': False,
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35 'showfunc': True,
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36 'git': False,
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37 'nodates': False,
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38 'ignorews': False,
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39 'ignorewsamount': False,
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40 'ignoreblanklines': False,
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41 }
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42
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43 __slots__ = defaults.keys()
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44
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45 def __init__(self, **opts):
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46 for k in self.__slots__:
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47 v = opts.get(k)
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48 if v is None:
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49 v = self.defaults[k]
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50 setattr(self, k, v)
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51
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52 defaultopts = diffopts()
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53
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54 def unidiff(a, ad, b, bd, fn, r=None, opts=defaultopts):
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55 def datetag(date):
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56 return (opts.git or opts.nodates) and '\n' or '\t%s\n' % date
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57
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58 if not a and not b: return ""
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59 epoch = util.datestr((0, 0))
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60
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61 if not opts.text and (util.binary(a) or util.binary(b)):
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62 def h(v):
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63 # md5 is used instead of sha1 because md5 is supposedly faster
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64 return md5.new(v).digest()
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65 if a and b and len(a) == len(b) and h(a) == h(b):
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66 return ""
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67 l = ['Binary file %s has changed\n' % fn]
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68 elif not a:
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69 b = splitnewlines(b)
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70 if a is None:
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71 l1 = '--- /dev/null%s' % datetag(epoch)
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72 else:
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73 l1 = "--- %s%s" % ("a/" + fn, datetag(ad))
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74 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd))
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75 l3 = "@@ -0,0 +1,%d @@\n" % len(b)
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76 l = [l1, l2, l3] + ["+" + e for e in b]
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77 elif not b:
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78 a = splitnewlines(a)
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79 l1 = "--- %s%s" % ("a/" + fn, datetag(ad))
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80 if b is None:
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81 l2 = '+++ /dev/null%s' % datetag(epoch)
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82 else:
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83 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd))
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84 l3 = "@@ -1,%d +0,0 @@\n" % len(a)
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85 l = [l1, l2, l3] + ["-" + e for e in a]
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86 else:
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87 al = splitnewlines(a)
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88 bl = splitnewlines(b)
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89 l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn, opts=opts))
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90 if not l: return ""
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91 # difflib uses a space, rather than a tab
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92 l[0] = "%s%s" % (l[0][:-2], datetag(ad))
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93 l[1] = "%s%s" % (l[1][:-2], datetag(bd))
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94
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95 for ln in xrange(len(l)):
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96 if l[ln][-1] != '\n':
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97 l[ln] += "\n\ No newline at end of file\n"
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98
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99 if r:
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100 l.insert(0, "diff %s %s\n" %
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101 (' '.join(["-r %s" % rev for rev in r]), fn))
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102
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103 return "".join(l)
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104
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105 # somewhat self contained replacement for difflib.unified_diff
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106 # t1 and t2 are the text to be diffed
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107 # l1 and l2 are the text broken up into lines
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108 # header1 and header2 are the filenames for the diff output
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109 def bunidiff(t1, t2, l1, l2, header1, header2, opts=defaultopts):
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110 def contextend(l, len):
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111 ret = l + opts.context
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112 if ret > len:
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113 ret = len
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114 return ret
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115
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116 def contextstart(l):
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117 ret = l - opts.context
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118 if ret < 0:
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119 return 0
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120 return ret
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121
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122 def yieldhunk(hunk, header):
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123 if header:
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124 for x in header:
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125 yield x
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126 (astart, a2, bstart, b2, delta) = hunk
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127 aend = contextend(a2, len(l1))
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128 alen = aend - astart
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129 blen = b2 - bstart + aend - a2
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130
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131 func = ""
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132 if opts.showfunc:
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133 # walk backwards from the start of the context
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134 # to find a line starting with an alphanumeric char.
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135 for x in xrange(astart, -1, -1):
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136 t = l1[x].rstrip()
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137 if funcre.match(t):
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138 func = ' ' + t[:40]
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139 break
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140
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141 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen,
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142 bstart + 1, blen, func)
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143 for x in delta:
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144 yield x
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145 for x in xrange(a2, aend):
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146 yield ' ' + l1[x]
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147
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148 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ]
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149
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150 if opts.showfunc:
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151 funcre = re.compile('\w')
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152 if opts.ignorewsamount:
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153 wsamountre = re.compile('[ \t]+')
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154 wsappendedre = re.compile(' \n')
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155 if opts.ignoreblanklines:
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156 wsblanklinesre = re.compile('\n')
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157 if opts.ignorews:
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158 wsre = re.compile('[ \t]')
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159
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160 # bdiff.blocks gives us the matching sequences in the files. The loop
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161 # below finds the spaces between those matching sequences and translates
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162 # them into diff output.
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163 #
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164 diff = bdiff.blocks(t1, t2)
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165 hunk = None
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166 for i in xrange(len(diff)):
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167 # The first match is special.
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168 # we've either found a match starting at line 0 or a match later
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169 # in the file. If it starts later, old and new below will both be
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170 # empty and we'll continue to the next match.
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171 if i > 0:
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172 s = diff[i-1]
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173 else:
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174 s = [0, 0, 0, 0]
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175 delta = []
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176 s1 = diff[i]
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177 a1 = s[1]
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178 a2 = s1[0]
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179 b1 = s[3]
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180 b2 = s1[2]
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181
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182 old = l1[a1:a2]
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183 new = l2[b1:b2]
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184
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185 # bdiff sometimes gives huge matches past eof, this check eats them,
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186 # and deals with the special first match case described above
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187 if not old and not new:
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188 continue
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189
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190 if opts.ignoreblanklines:
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191 wsold = wsblanklinesre.sub('', "".join(old))
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192 wsnew = wsblanklinesre.sub('', "".join(new))
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193 if wsold == wsnew:
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194 continue
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195
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196 if opts.ignorewsamount:
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197 wsold = wsamountre.sub(' ', "".join(old))
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198 wsold = wsappendedre.sub('\n', wsold)
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199 wsnew = wsamountre.sub(' ', "".join(new))
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200 wsnew = wsappendedre.sub('\n', wsnew)
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201 if wsold == wsnew:
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202 continue
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203
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204 if opts.ignorews:
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205 wsold = wsre.sub('', "".join(old))
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206 wsnew = wsre.sub('', "".join(new))
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207 if wsold == wsnew:
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208 continue
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209
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210 astart = contextstart(a1)
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211 bstart = contextstart(b1)
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212 prev = None
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213 if hunk:
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214 # join with the previous hunk if it falls inside the context
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215 if astart < hunk[1] + opts.context + 1:
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diff changeset
216 prev = hunk
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217 astart = hunk[1]
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218 bstart = hunk[3]
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219 else:
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220 for x in yieldhunk(hunk, header):
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221 yield x
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222 # we only want to yield the header if the files differ, and
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223 # we only want to yield it once.
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224 header = None
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225 if prev:
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226 # we've joined the previous hunk, record the new ending points.
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227 hunk[1] = a2
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228 hunk[3] = b2
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229 delta = hunk[4]
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230 else:
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231 # create a new hunk
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232 hunk = [ astart, a2, bstart, b2, delta ]
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233
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234 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ]
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235 delta[len(delta):] = [ '-' + x for x in old ]
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diff changeset
236 delta[len(delta):] = [ '+' + x for x in new ]
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diff changeset
237
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diff changeset
238 if hunk:
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239 for x in yieldhunk(hunk, header):
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240 yield x
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diff changeset
241
120
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diff changeset
242 def patchtext(bin):
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diff changeset
243 pos = 0
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diff changeset
244 t = []
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diff changeset
245 while pos < len(bin):
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diff changeset
246 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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diff changeset
247 pos += 12
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diff changeset
248 t.append(bin[pos:pos + l])
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diff changeset
249 pos += l
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diff changeset
250 return "".join(t)
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diff changeset
251
0
9117c6561b0b Add back links from file revisions to changeset revisions
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diff changeset
252 def patch(a, bin):
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diff changeset
253 return mpatch.patches(a, [bin])
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diff changeset
254
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diff changeset
255 patches = mpatch.patches
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441ea218414e Fill in the uncompressed size during revlog.addgroup
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diff changeset
256 patchedsize = mpatch.patchedsize
432
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diff changeset
257 textdiff = bdiff.bdiff