Mercurial > hg
annotate mercurial/mdiff.py @ 30320:bff5ccbe5ead stable
vfs: ignore EPERM at os.utime, which avoids ambiguity at renaming (issue5418)
According to POSIX specification, just having group write access to a
file causes EPERM at invocation of os.utime() with an explicit time
information (e.g. working on the repository shared by group access
permission).
To ignore EPERM at renaming in such case, this patch makes
vfs.rename() use filestat.avoidambig() introduced by previous patch.
author | FUJIWARA Katsunori <foozy@lares.dti.ne.jp> |
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date | Sun, 13 Nov 2016 06:11:56 +0900 |
parents | ff17dff99295 |
children | 3eeb8e138e5c |
rev | line source |
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1 # mdiff.py - diff and patch routines for mercurial |
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2 # |
2859 | 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 of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import re |
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11 import struct |
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12 import zlib |
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13 |
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14 from .i18n import _ |
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15 from . import ( |
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16 base85, |
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17 bdiff, |
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18 error, |
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19 mpatch, |
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20 util, |
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21 ) |
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Add back links from file revisions to changeset revisions
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22 |
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23 def splitnewlines(text): |
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24 '''like str.splitlines, but only split on newlines.''' |
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25 lines = [l + '\n' for l in text.split('\n')] |
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26 if lines: |
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27 if lines[-1] == '\n': |
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28 lines.pop() |
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29 else: |
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30 lines[-1] = lines[-1][:-1] |
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31 return lines |
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32 |
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33 class diffopts(object): |
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34 '''context is the number of context lines |
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35 text treats all files as text |
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36 showfunc enables diff -p output |
2907 | 37 git enables the git extended patch format |
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38 nodates removes dates from diff headers |
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39 nobinary ignores binary files |
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40 noprefix disables the 'a/' and 'b/' prefixes (ignored in plain mode) |
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41 ignorews ignores all whitespace changes in the diff |
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42 ignorewsamount ignores changes in the amount of whitespace |
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43 ignoreblanklines ignores changes whose lines are all blank |
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44 upgrade generates git diffs to avoid data loss |
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45 ''' |
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46 |
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47 defaults = { |
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48 'context': 3, |
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49 'text': False, |
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50 'showfunc': False, |
2907 | 51 'git': False, |
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52 'nodates': False, |
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53 'nobinary': False, |
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54 'noprefix': False, |
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55 'ignorews': False, |
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56 'ignorewsamount': False, |
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57 'ignoreblanklines': False, |
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58 'upgrade': False, |
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59 } |
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60 |
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61 def __init__(self, **opts): |
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62 for k in self.defaults.keys(): |
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63 v = opts.get(k) |
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64 if v is None: |
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65 v = self.defaults[k] |
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66 setattr(self, k, v) |
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67 |
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68 try: |
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69 self.context = int(self.context) |
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70 except ValueError: |
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71 raise error.Abort(_('diff context lines count must be ' |
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72 'an integer, not %r') % self.context) |
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73 |
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74 def copy(self, **kwargs): |
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75 opts = dict((k, getattr(self, k)) for k in self.defaults) |
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76 opts.update(kwargs) |
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77 return diffopts(**opts) |
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78 |
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79 defaultopts = diffopts() |
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80 |
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81 def wsclean(opts, text, blank=True): |
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82 if opts.ignorews: |
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83 text = bdiff.fixws(text, 1) |
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84 elif opts.ignorewsamount: |
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85 text = bdiff.fixws(text, 0) |
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86 if blank and opts.ignoreblanklines: |
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87 text = re.sub('\n+', '\n', text).strip('\n') |
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88 return text |
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89 |
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90 def splitblock(base1, lines1, base2, lines2, opts): |
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91 # The input lines matches except for interwoven blank lines. We |
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92 # transform it into a sequence of matching blocks and blank blocks. |
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93 lines1 = [(wsclean(opts, l) and 1 or 0) for l in lines1] |
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94 lines2 = [(wsclean(opts, l) and 1 or 0) for l in lines2] |
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95 s1, e1 = 0, len(lines1) |
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96 s2, e2 = 0, len(lines2) |
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97 while s1 < e1 or s2 < e2: |
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98 i1, i2, btype = s1, s2, '=' |
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99 if (i1 >= e1 or lines1[i1] == 0 |
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100 or i2 >= e2 or lines2[i2] == 0): |
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101 # Consume the block of blank lines |
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102 btype = '~' |
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103 while i1 < e1 and lines1[i1] == 0: |
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104 i1 += 1 |
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105 while i2 < e2 and lines2[i2] == 0: |
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106 i2 += 1 |
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107 else: |
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108 # Consume the matching lines |
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109 while i1 < e1 and lines1[i1] == 1 and lines2[i2] == 1: |
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110 i1 += 1 |
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111 i2 += 1 |
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112 yield [base1 + s1, base1 + i1, base2 + s2, base2 + i2], btype |
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113 s1 = i1 |
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114 s2 = i2 |
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115 |
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116 def allblocks(text1, text2, opts=None, lines1=None, lines2=None): |
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117 """Return (block, type) tuples, where block is an mdiff.blocks |
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118 line entry. type is '=' for blocks matching exactly one another |
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119 (bdiff blocks), '!' for non-matching blocks and '~' for blocks |
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120 matching only after having filtered blank lines. |
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121 line1 and line2 are text1 and text2 split with splitnewlines() if |
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122 they are already available. |
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123 """ |
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124 if opts is None: |
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125 opts = defaultopts |
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126 if opts.ignorews or opts.ignorewsamount: |
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127 text1 = wsclean(opts, text1, False) |
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128 text2 = wsclean(opts, text2, False) |
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129 diff = bdiff.blocks(text1, text2) |
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130 for i, s1 in enumerate(diff): |
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131 # The first match is special. |
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132 # we've either found a match starting at line 0 or a match later |
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133 # in the file. If it starts later, old and new below will both be |
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134 # empty and we'll continue to the next match. |
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135 if i > 0: |
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136 s = diff[i - 1] |
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137 else: |
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138 s = [0, 0, 0, 0] |
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139 s = [s[1], s1[0], s[3], s1[2]] |
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140 |
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141 # bdiff sometimes gives huge matches past eof, this check eats them, |
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142 # and deals with the special first match case described above |
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143 if s[0] != s[1] or s[2] != s[3]: |
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144 type = '!' |
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145 if opts.ignoreblanklines: |
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146 if lines1 is None: |
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147 lines1 = splitnewlines(text1) |
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148 if lines2 is None: |
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149 lines2 = splitnewlines(text2) |
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150 old = wsclean(opts, "".join(lines1[s[0]:s[1]])) |
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151 new = wsclean(opts, "".join(lines2[s[2]:s[3]])) |
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152 if old == new: |
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153 type = '~' |
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154 yield s, type |
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155 yield s1, '=' |
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156 |
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157 def unidiff(a, ad, b, bd, fn1, fn2, opts=defaultopts): |
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158 def datetag(date, fn=None): |
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159 if not opts.git and not opts.nodates: |
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160 return '\t%s\n' % date |
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161 if fn and ' ' in fn: |
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162 return '\t\n' |
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163 return '\n' |
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164 |
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165 if not a and not b: |
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166 return "" |
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167 |
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168 if opts.noprefix: |
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169 aprefix = bprefix = '' |
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170 else: |
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171 aprefix = 'a/' |
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172 bprefix = 'b/' |
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173 |
1379 | 174 epoch = util.datestr((0, 0)) |
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175 |
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176 fn1 = util.pconvert(fn1) |
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177 fn2 = util.pconvert(fn2) |
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178 |
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179 if not opts.text and (util.binary(a) or util.binary(b)): |
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180 if a and b and len(a) == len(b) and a == b: |
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181 return "" |
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182 l = ['Binary file %s has changed\n' % fn1] |
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183 elif not a: |
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184 b = splitnewlines(b) |
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185 if a is None: |
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186 l1 = '--- /dev/null%s' % datetag(epoch) |
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187 else: |
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188 l1 = "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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189 l2 = "+++ %s%s" % (bprefix + fn2, datetag(bd, fn2)) |
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190 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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191 l = [l1, l2, l3] + ["+" + e for e in b] |
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192 elif not b: |
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193 a = splitnewlines(a) |
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194 l1 = "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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195 if b is None: |
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196 l2 = '+++ /dev/null%s' % datetag(epoch) |
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197 else: |
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198 l2 = "+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)) |
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199 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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200 l = [l1, l2, l3] + ["-" + e for e in a] |
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201 else: |
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202 al = splitnewlines(a) |
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203 bl = splitnewlines(b) |
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204 l = list(_unidiff(a, b, al, bl, opts=opts)) |
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205 if not l: |
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206 return "" |
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207 |
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208 l.insert(0, "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1))) |
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209 l.insert(1, "+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2))) |
170 | 210 |
211 for ln in xrange(len(l)): | |
212 if l[ln][-1] != '\n': | |
213 l[ln] += "\n\ No newline at end of file\n" | |
214 | |
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215 return "".join(l) |
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216 |
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217 # creates a headerless unified diff |
1637 | 218 # t1 and t2 are the text to be diffed |
219 # l1 and l2 are the text broken up into lines | |
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220 def _unidiff(t1, t2, l1, l2, opts=defaultopts): |
1637 | 221 def contextend(l, len): |
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222 ret = l + opts.context |
1637 | 223 if ret > len: |
224 ret = len | |
225 return ret | |
226 | |
227 def contextstart(l): | |
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228 ret = l - opts.context |
1637 | 229 if ret < 0: |
230 return 0 | |
231 return ret | |
232 | |
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233 lastfunc = [0, ''] |
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234 def yieldhunk(hunk): |
1637 | 235 (astart, a2, bstart, b2, delta) = hunk |
236 aend = contextend(a2, len(l1)) | |
237 alen = aend - astart | |
238 blen = b2 - bstart + aend - a2 | |
239 | |
240 func = "" | |
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241 if opts.showfunc: |
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242 lastpos, func = lastfunc |
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243 # walk backwards from the start of the context up to the start of |
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244 # the previous hunk context until we find a line starting with an |
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245 # alphanumeric char. |
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246 for i in xrange(astart - 1, lastpos - 1, -1): |
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247 if l1[i][0].isalnum(): |
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248 func = ' ' + l1[i].rstrip()[:40] |
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249 lastfunc[1] = func |
1637 | 250 break |
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251 # by recording this hunk's starting point as the next place to |
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252 # start looking for function lines, we avoid reading any line in |
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253 # the file more than once. |
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254 lastfunc[0] = astart |
1637 | 255 |
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256 # zero-length hunk ranges report their start line as one less |
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257 if alen: |
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258 astart += 1 |
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259 if blen: |
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260 bstart += 1 |
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261 |
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262 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart, alen, |
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263 bstart, blen, func) |
1637 | 264 for x in delta: |
265 yield x | |
266 for x in xrange(a2, aend): | |
267 yield ' ' + l1[x] | |
268 | |
269 # bdiff.blocks gives us the matching sequences in the files. The loop | |
270 # below finds the spaces between those matching sequences and translates | |
271 # them into diff output. | |
272 # | |
273 hunk = None | |
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274 ignoredlines = 0 |
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275 for s, stype in allblocks(t1, t2, opts, l1, l2): |
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276 a1, a2, b1, b2 = s |
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277 if stype != '!': |
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278 if stype == '~': |
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279 # The diff context lines are based on t1 content. When |
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280 # blank lines are ignored, the new lines offsets must |
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281 # be adjusted as if equivalent blocks ('~') had the |
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282 # same sizes on both sides. |
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283 ignoredlines += (b2 - b1) - (a2 - a1) |
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284 continue |
1637 | 285 delta = [] |
286 old = l1[a1:a2] | |
287 new = l2[b1:b2] | |
288 | |
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289 b1 -= ignoredlines |
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290 b2 -= ignoredlines |
1637 | 291 astart = contextstart(a1) |
292 bstart = contextstart(b1) | |
293 prev = None | |
294 if hunk: | |
295 # join with the previous hunk if it falls inside the context | |
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296 if astart < hunk[1] + opts.context + 1: |
1637 | 297 prev = hunk |
298 astart = hunk[1] | |
299 bstart = hunk[3] | |
300 else: | |
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301 for x in yieldhunk(hunk): |
1637 | 302 yield x |
303 if prev: | |
304 # we've joined the previous hunk, record the new ending points. | |
305 hunk[1] = a2 | |
306 hunk[3] = b2 | |
307 delta = hunk[4] | |
308 else: | |
309 # create a new hunk | |
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310 hunk = [astart, a2, bstart, b2, delta] |
1637 | 311 |
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312 delta[len(delta):] = [' ' + x for x in l1[astart:a1]] |
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313 delta[len(delta):] = ['-' + x for x in old] |
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314 delta[len(delta):] = ['+' + x for x in new] |
1637 | 315 |
316 if hunk: | |
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317 for x in yieldhunk(hunk): |
1637 | 318 yield x |
319 | |
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320 def b85diff(to, tn): |
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321 '''print base85-encoded binary diff''' |
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322 def fmtline(line): |
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323 l = len(line) |
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324 if l <= 26: |
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325 l = chr(ord('A') + l - 1) |
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326 else: |
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327 l = chr(l - 26 + ord('a') - 1) |
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328 return '%c%s\n' % (l, base85.b85encode(line, True)) |
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329 |
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330 def chunk(text, csize=52): |
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331 l = len(text) |
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332 i = 0 |
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333 while i < l: |
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334 yield text[i:i + csize] |
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335 i += csize |
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336 |
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337 if to is None: |
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338 to = '' |
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339 if tn is None: |
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340 tn = '' |
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341 |
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342 if to == tn: |
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343 return '' |
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344 |
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345 # TODO: deltas |
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346 ret = [] |
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347 ret.append('GIT binary patch\n') |
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348 ret.append('literal %s\n' % len(tn)) |
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349 for l in chunk(zlib.compress(tn)): |
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350 ret.append(fmtline(l)) |
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351 ret.append('\n') |
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352 |
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353 return ''.join(ret) |
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354 |
120
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355 def patchtext(bin): |
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356 pos = 0 |
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357 t = [] |
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358 while pos < len(bin): |
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359 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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360 pos += 12 |
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361 t.append(bin[pos:pos + l]) |
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362 pos += l |
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363 return "".join(t) |
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364 |
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365 def patch(a, bin): |
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366 if len(a) == 0: |
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367 # skip over trivial delta header |
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368 return util.buffer(bin, 12) |
1379 | 369 return mpatch.patches(a, [bin]) |
432 | 370 |
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371 # similar to difflib.SequenceMatcher.get_matching_blocks |
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372 def get_matching_blocks(a, b): |
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373 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)] |
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374 |
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375 def trivialdiffheader(length): |
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376 return struct.pack(">lll", 0, 0, length) if length else '' |
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377 |
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378 def replacediffheader(oldlen, newlen): |
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379 return struct.pack(">lll", 0, oldlen, newlen) |
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380 |
1379 | 381 patches = mpatch.patches |
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382 patchedsize = mpatch.patchedsize |
432 | 383 textdiff = bdiff.bdiff |