Mercurial > hg
annotate mercurial/mdiff.py @ 28501:66513f6ca038
commands: centralize code to update with extra care for non-file components
This patch centralizes similar code paths to update the working
directory with extra care for non-file components (e.g. bookmark) into
newly added function updatetotally().
'if True' at the beginning of updatetotally() is redundant at this
patch, but useful to reduce amount of changes in subsequent patch.
author | FUJIWARA Katsunori <foozy@lares.dti.ne.jp> |
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date | Sat, 12 Mar 2016 04:35:42 +0900 |
parents | 7a678a12a5cf |
children | 30789efb1e5e |
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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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 __slots__ = defaults.keys() |
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62 |
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63 def __init__(self, **opts): |
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64 for k in self.__slots__: |
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65 v = opts.get(k) |
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66 if v is None: |
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67 v = self.defaults[k] |
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68 setattr(self, k, v) |
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69 |
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70 try: |
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71 self.context = int(self.context) |
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72 except ValueError: |
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73 raise error.Abort(_('diff context lines count must be ' |
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74 'an integer, not %r') % self.context) |
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75 |
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76 def copy(self, **kwargs): |
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77 opts = dict((k, getattr(self, k)) for k in self.defaults) |
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78 opts.update(kwargs) |
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79 return diffopts(**opts) |
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80 |
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81 defaultopts = diffopts() |
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82 |
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83 def wsclean(opts, text, blank=True): |
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84 if opts.ignorews: |
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85 text = bdiff.fixws(text, 1) |
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86 elif opts.ignorewsamount: |
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87 text = bdiff.fixws(text, 0) |
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88 if blank and opts.ignoreblanklines: |
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89 text = re.sub('\n+', '\n', text).strip('\n') |
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90 return text |
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91 |
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92 def splitblock(base1, lines1, base2, lines2, opts): |
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93 # The input lines matches except for interwoven blank lines. We |
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94 # transform it into a sequence of matching blocks and blank blocks. |
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95 lines1 = [(wsclean(opts, l) and 1 or 0) for l in lines1] |
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96 lines2 = [(wsclean(opts, l) and 1 or 0) for l in lines2] |
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97 s1, e1 = 0, len(lines1) |
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98 s2, e2 = 0, len(lines2) |
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99 while s1 < e1 or s2 < e2: |
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100 i1, i2, btype = s1, s2, '=' |
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101 if (i1 >= e1 or lines1[i1] == 0 |
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102 or i2 >= e2 or lines2[i2] == 0): |
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103 # Consume the block of blank lines |
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104 btype = '~' |
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105 while i1 < e1 and lines1[i1] == 0: |
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106 i1 += 1 |
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107 while i2 < e2 and lines2[i2] == 0: |
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108 i2 += 1 |
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109 else: |
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110 # Consume the matching lines |
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111 while i1 < e1 and lines1[i1] == 1 and lines2[i2] == 1: |
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112 i1 += 1 |
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113 i2 += 1 |
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114 yield [base1 + s1, base1 + i1, base2 + s2, base2 + i2], btype |
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115 s1 = i1 |
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116 s2 = i2 |
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117 |
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118 def allblocks(text1, text2, opts=None, lines1=None, lines2=None, refine=False): |
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119 """Return (block, type) tuples, where block is an mdiff.blocks |
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120 line entry. type is '=' for blocks matching exactly one another |
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121 (bdiff blocks), '!' for non-matching blocks and '~' for blocks |
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122 matching only after having filtered blank lines. If refine is True, |
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123 then '~' blocks are refined and are only made of blank lines. |
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124 line1 and line2 are text1 and text2 split with splitnewlines() if |
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125 they are already available. |
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126 """ |
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127 if opts is None: |
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128 opts = defaultopts |
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129 if opts.ignorews or opts.ignorewsamount: |
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130 text1 = wsclean(opts, text1, False) |
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131 text2 = wsclean(opts, text2, False) |
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132 diff = bdiff.blocks(text1, text2) |
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133 for i, s1 in enumerate(diff): |
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134 # The first match is special. |
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135 # we've either found a match starting at line 0 or a match later |
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136 # in the file. If it starts later, old and new below will both be |
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137 # empty and we'll continue to the next match. |
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138 if i > 0: |
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139 s = diff[i - 1] |
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140 else: |
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141 s = [0, 0, 0, 0] |
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142 s = [s[1], s1[0], s[3], s1[2]] |
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143 |
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144 # bdiff sometimes gives huge matches past eof, this check eats them, |
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145 # and deals with the special first match case described above |
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146 if s[0] != s[1] or s[2] != s[3]: |
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147 type = '!' |
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148 if opts.ignoreblanklines: |
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149 if lines1 is None: |
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150 lines1 = splitnewlines(text1) |
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151 if lines2 is None: |
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152 lines2 = splitnewlines(text2) |
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153 old = wsclean(opts, "".join(lines1[s[0]:s[1]])) |
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154 new = wsclean(opts, "".join(lines2[s[2]:s[3]])) |
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155 if old == new: |
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156 type = '~' |
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157 yield s, type |
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158 yield s1, '=' |
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159 |
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160 def unidiff(a, ad, b, bd, fn1, fn2, opts=defaultopts): |
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161 def datetag(date, fn=None): |
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162 if not opts.git and not opts.nodates: |
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163 return '\t%s\n' % date |
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164 if fn and ' ' in fn: |
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165 return '\t\n' |
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166 return '\n' |
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167 |
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168 if not a and not b: |
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169 return "" |
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170 |
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171 if opts.noprefix: |
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172 aprefix = bprefix = '' |
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173 else: |
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174 aprefix = 'a/' |
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175 bprefix = 'b/' |
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176 |
1379 | 177 epoch = util.datestr((0, 0)) |
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178 |
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179 fn1 = util.pconvert(fn1) |
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180 fn2 = util.pconvert(fn2) |
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181 |
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182 if not opts.text and (util.binary(a) or util.binary(b)): |
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183 if a and b and len(a) == len(b) and a == b: |
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184 return "" |
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185 l = ['Binary file %s has changed\n' % fn1] |
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186 elif not a: |
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187 b = splitnewlines(b) |
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188 if a is None: |
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189 l1 = '--- /dev/null%s' % datetag(epoch) |
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190 else: |
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191 l1 = "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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192 l2 = "+++ %s%s" % (bprefix + fn2, datetag(bd, fn2)) |
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193 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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194 l = [l1, l2, l3] + ["+" + e for e in b] |
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195 elif not b: |
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196 a = splitnewlines(a) |
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197 l1 = "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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198 if b is None: |
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199 l2 = '+++ /dev/null%s' % datetag(epoch) |
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200 else: |
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201 l2 = "+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)) |
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202 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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203 l = [l1, l2, l3] + ["-" + e for e in a] |
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204 else: |
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205 al = splitnewlines(a) |
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206 bl = splitnewlines(b) |
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207 l = list(_unidiff(a, b, al, bl, opts=opts)) |
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208 if not l: |
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209 return "" |
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210 |
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211 l.insert(0, "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1))) |
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212 l.insert(1, "+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2))) |
170 | 213 |
214 for ln in xrange(len(l)): | |
215 if l[ln][-1] != '\n': | |
216 l[ln] += "\n\ No newline at end of file\n" | |
217 | |
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218 return "".join(l) |
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219 |
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220 # creates a headerless unified diff |
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222 # l1 and l2 are the text broken up into lines | |
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223 def _unidiff(t1, t2, l1, l2, opts=defaultopts): |
1637 | 224 def contextend(l, len): |
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225 ret = l + opts.context |
1637 | 226 if ret > len: |
227 ret = len | |
228 return ret | |
229 | |
230 def contextstart(l): | |
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231 ret = l - opts.context |
1637 | 232 if ret < 0: |
233 return 0 | |
234 return ret | |
235 | |
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236 lastfunc = [0, ''] |
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237 def yieldhunk(hunk): |
1637 | 238 (astart, a2, bstart, b2, delta) = hunk |
239 aend = contextend(a2, len(l1)) | |
240 alen = aend - astart | |
241 blen = b2 - bstart + aend - a2 | |
242 | |
243 func = "" | |
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244 if opts.showfunc: |
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245 lastpos, func = lastfunc |
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246 # walk backwards from the start of the context up to the start of |
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247 # the previous hunk context until we find a line starting with an |
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248 # alphanumeric char. |
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249 for i in xrange(astart - 1, lastpos - 1, -1): |
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250 if l1[i][0].isalnum(): |
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251 func = ' ' + l1[i].rstrip()[:40] |
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252 lastfunc[1] = func |
1637 | 253 break |
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254 # by recording this hunk's starting point as the next place to |
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255 # start looking for function lines, we avoid reading any line in |
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256 # the file more than once. |
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257 lastfunc[0] = astart |
1637 | 258 |
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259 # zero-length hunk ranges report their start line as one less |
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260 if alen: |
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261 astart += 1 |
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262 if blen: |
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263 bstart += 1 |
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264 |
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265 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart, alen, |
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266 bstart, blen, func) |
1637 | 267 for x in delta: |
268 yield x | |
269 for x in xrange(a2, aend): | |
270 yield ' ' + l1[x] | |
271 | |
272 # bdiff.blocks gives us the matching sequences in the files. The loop | |
273 # below finds the spaces between those matching sequences and translates | |
274 # them into diff output. | |
275 # | |
276 hunk = None | |
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277 ignoredlines = 0 |
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278 for s, stype in allblocks(t1, t2, opts, l1, l2): |
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279 a1, a2, b1, b2 = s |
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280 if stype != '!': |
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281 if stype == '~': |
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282 # The diff context lines are based on t1 content. When |
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283 # blank lines are ignored, the new lines offsets must |
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284 # be adjusted as if equivalent blocks ('~') had the |
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285 # same sizes on both sides. |
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286 ignoredlines += (b2 - b1) - (a2 - a1) |
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287 continue |
1637 | 288 delta = [] |
289 old = l1[a1:a2] | |
290 new = l2[b1:b2] | |
291 | |
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292 b1 -= ignoredlines |
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293 b2 -= ignoredlines |
1637 | 294 astart = contextstart(a1) |
295 bstart = contextstart(b1) | |
296 prev = None | |
297 if hunk: | |
298 # join with the previous hunk if it falls inside the context | |
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299 if astart < hunk[1] + opts.context + 1: |
1637 | 300 prev = hunk |
301 astart = hunk[1] | |
302 bstart = hunk[3] | |
303 else: | |
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304 for x in yieldhunk(hunk): |
1637 | 305 yield x |
306 if prev: | |
307 # we've joined the previous hunk, record the new ending points. | |
308 hunk[1] = a2 | |
309 hunk[3] = b2 | |
310 delta = hunk[4] | |
311 else: | |
312 # create a new hunk | |
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313 hunk = [astart, a2, bstart, b2, delta] |
1637 | 314 |
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315 delta[len(delta):] = [' ' + x for x in l1[astart:a1]] |
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316 delta[len(delta):] = ['-' + x for x in old] |
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317 delta[len(delta):] = ['+' + x for x in new] |
1637 | 318 |
319 if hunk: | |
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320 for x in yieldhunk(hunk): |
1637 | 321 yield x |
322 | |
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323 def b85diff(to, tn): |
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324 '''print base85-encoded binary diff''' |
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325 def fmtline(line): |
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326 l = len(line) |
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327 if l <= 26: |
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328 l = chr(ord('A') + l - 1) |
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329 else: |
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330 l = chr(l - 26 + ord('a') - 1) |
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331 return '%c%s\n' % (l, base85.b85encode(line, True)) |
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332 |
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333 def chunk(text, csize=52): |
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334 l = len(text) |
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335 i = 0 |
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336 while i < l: |
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337 yield text[i:i + csize] |
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338 i += csize |
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339 |
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340 if to is None: |
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341 to = '' |
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342 if tn is None: |
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343 tn = '' |
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344 |
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345 if to == tn: |
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346 return '' |
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347 |
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348 # TODO: deltas |
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349 ret = [] |
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350 ret.append('GIT binary patch\n') |
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351 ret.append('literal %s\n' % len(tn)) |
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352 for l in chunk(zlib.compress(tn)): |
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353 ret.append(fmtline(l)) |
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354 ret.append('\n') |
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355 |
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356 return ''.join(ret) |
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357 |
120
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358 def patchtext(bin): |
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359 pos = 0 |
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360 t = [] |
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361 while pos < len(bin): |
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362 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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363 pos += 12 |
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364 t.append(bin[pos:pos + l]) |
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365 pos += l |
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366 return "".join(t) |
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367 |
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368 def patch(a, bin): |
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369 if len(a) == 0: |
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370 # skip over trivial delta header |
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371 return util.buffer(bin, 12) |
1379 | 372 return mpatch.patches(a, [bin]) |
432 | 373 |
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374 # similar to difflib.SequenceMatcher.get_matching_blocks |
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375 def get_matching_blocks(a, b): |
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376 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)] |
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377 |
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378 def trivialdiffheader(length): |
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379 return struct.pack(">lll", 0, 0, length) if length else '' |
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380 |
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381 def replacediffheader(oldlen, newlen): |
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382 return struct.pack(">lll", 0, oldlen, newlen) |
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383 |
1379 | 384 patches = mpatch.patches |
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385 patchedsize = mpatch.patchedsize |
432 | 386 textdiff = bdiff.bdiff |