Mercurial > hg
annotate mercurial/simplemerge.py @ 27015:341cb90ffd18
util: disable floating point stat times (issue4836)
Alternate fix for this issue which avoids putting extra function calls
and exception handling in the fast path.
For almost all purposes, integer timestamps are preferable to
Mercurial. It stores integer timestamps in the dirstate and would thus
like to avoid doing any float/int comparisons or conversions. We will
continue to have to deal with 1-second granularity on filesystems for
quite some time, so this won't significantly hinder our capabilities.
This has some impact on our file cache validation code in that it
lowers timestamp resolution. But as we still have to deal with
low-resolution filesystems, we're not relying on this anyway.
An alternate approach is to use stat[ST_MTIME], which is guaranteed to
be an integer. But since this support isn't already in our extension,
we can't depend on it being available without adding a hard Python->C
API dependency that's painful for people like yours truly who have
bisect regularly and people without compilers.
author | Matt Mackall <mpm@selenic.com> |
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date | Thu, 19 Nov 2015 13:21:24 -0600 |
parents | ef1eb6df7071 |
children | a504794cee29 |
rev | line source |
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1 # Copyright (C) 2004, 2005 Canonical Ltd |
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2 # |
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3 # This program is free software; you can redistribute it and/or modify |
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4 # it under the terms of the GNU General Public License as published by |
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5 # the Free Software Foundation; either version 2 of the License, or |
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6 # (at your option) any later version. |
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7 # |
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8 # This program is distributed in the hope that it will be useful, |
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9 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 # GNU General Public License for more details. |
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12 # |
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13 # You should have received a copy of the GNU General Public License |
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14 # along with this program; if not, see <http://www.gnu.org/licenses/>. |
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15 |
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16 # mbp: "you know that thing where cvs gives you conflict markers?" |
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17 # s: "i hate that." |
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18 |
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19 from __future__ import absolute_import |
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20 |
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21 import os |
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22 import sys |
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23 |
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24 from .i18n import _ |
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25 from . import ( |
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26 error, |
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27 mdiff, |
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28 scmutil, |
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29 util, |
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30 ) |
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31 |
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32 class CantReprocessAndShowBase(Exception): |
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33 pass |
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34 |
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35 def intersect(ra, rb): |
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36 """Given two ranges return the range where they intersect or None. |
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37 |
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38 >>> intersect((0, 10), (0, 6)) |
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39 (0, 6) |
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40 >>> intersect((0, 10), (5, 15)) |
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41 (5, 10) |
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42 >>> intersect((0, 10), (10, 15)) |
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43 >>> intersect((0, 9), (10, 15)) |
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44 >>> intersect((0, 9), (7, 15)) |
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45 (7, 9) |
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46 """ |
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47 assert ra[0] <= ra[1] |
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48 assert rb[0] <= rb[1] |
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49 |
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50 sa = max(ra[0], rb[0]) |
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51 sb = min(ra[1], rb[1]) |
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52 if sa < sb: |
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53 return sa, sb |
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54 else: |
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55 return None |
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56 |
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57 def compare_range(a, astart, aend, b, bstart, bend): |
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58 """Compare a[astart:aend] == b[bstart:bend], without slicing. |
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59 """ |
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60 if (aend - astart) != (bend - bstart): |
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61 return False |
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62 for ia, ib in zip(xrange(astart, aend), xrange(bstart, bend)): |
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63 if a[ia] != b[ib]: |
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64 return False |
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65 else: |
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66 return True |
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67 |
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68 class Merge3Text(object): |
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69 """3-way merge of texts. |
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70 |
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71 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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72 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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73 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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74 self.basetext = basetext |
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75 self.atext = atext |
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76 self.btext = btext |
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77 if base is None: |
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78 base = mdiff.splitnewlines(basetext) |
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79 if a is None: |
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80 a = mdiff.splitnewlines(atext) |
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81 if b is None: |
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82 b = mdiff.splitnewlines(btext) |
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83 self.base = base |
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84 self.a = a |
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85 self.b = b |
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86 |
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87 def merge_lines(self, |
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88 name_a=None, |
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89 name_b=None, |
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90 name_base=None, |
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91 start_marker='<<<<<<<', |
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92 mid_marker='=======', |
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93 end_marker='>>>>>>>', |
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94 base_marker=None, |
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95 localorother=None): |
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96 """Return merge in cvs-like form. |
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97 """ |
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98 self.conflicts = False |
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99 newline = '\n' |
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100 if len(self.a) > 0: |
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101 if self.a[0].endswith('\r\n'): |
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102 newline = '\r\n' |
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103 elif self.a[0].endswith('\r'): |
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104 newline = '\r' |
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105 if name_a and start_marker: |
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106 start_marker = start_marker + ' ' + name_a |
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107 if name_b and end_marker: |
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108 end_marker = end_marker + ' ' + name_b |
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109 if name_base and base_marker: |
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110 base_marker = base_marker + ' ' + name_base |
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111 merge_regions = self.merge_regions() |
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112 for t in merge_regions: |
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113 what = t[0] |
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114 if what == 'unchanged': |
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115 for i in range(t[1], t[2]): |
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116 yield self.base[i] |
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117 elif what == 'a' or what == 'same': |
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118 for i in range(t[1], t[2]): |
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119 yield self.a[i] |
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120 elif what == 'b': |
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121 for i in range(t[1], t[2]): |
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122 yield self.b[i] |
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123 elif what == 'conflict': |
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124 if localorother == 'local': |
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125 for i in range(t[3], t[4]): |
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126 yield self.a[i] |
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127 elif localorother == 'other': |
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128 for i in range(t[5], t[6]): |
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129 yield self.b[i] |
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130 else: |
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131 self.conflicts = True |
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132 if start_marker is not None: |
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133 yield start_marker + newline |
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134 for i in range(t[3], t[4]): |
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135 yield self.a[i] |
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136 if base_marker is not None: |
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137 yield base_marker + newline |
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138 for i in range(t[1], t[2]): |
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139 yield self.base[i] |
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140 if mid_marker is not None: |
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141 yield mid_marker + newline |
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142 for i in range(t[5], t[6]): |
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143 yield self.b[i] |
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144 if end_marker is not None: |
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145 yield end_marker + newline |
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146 else: |
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147 raise ValueError(what) |
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148 |
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149 def merge_groups(self): |
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150 """Yield sequence of line groups. Each one is a tuple: |
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151 |
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152 'unchanged', lines |
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153 Lines unchanged from base |
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154 |
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155 'a', lines |
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156 Lines taken from a |
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157 |
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158 'same', lines |
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159 Lines taken from a (and equal to b) |
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160 |
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161 'b', lines |
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162 Lines taken from b |
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163 |
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164 'conflict', base_lines, a_lines, b_lines |
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165 Lines from base were changed to either a or b and conflict. |
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166 """ |
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167 for t in self.merge_regions(): |
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168 what = t[0] |
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169 if what == 'unchanged': |
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170 yield what, self.base[t[1]:t[2]] |
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171 elif what == 'a' or what == 'same': |
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172 yield what, self.a[t[1]:t[2]] |
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173 elif what == 'b': |
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174 yield what, self.b[t[1]:t[2]] |
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175 elif what == 'conflict': |
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176 yield (what, |
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177 self.base[t[1]:t[2]], |
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178 self.a[t[3]:t[4]], |
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179 self.b[t[5]:t[6]]) |
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180 else: |
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181 raise ValueError(what) |
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182 |
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183 def merge_regions(self): |
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184 """Return sequences of matching and conflicting regions. |
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185 |
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186 This returns tuples, where the first value says what kind we |
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187 have: |
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188 |
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189 'unchanged', start, end |
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190 Take a region of base[start:end] |
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191 |
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192 'same', astart, aend |
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193 b and a are different from base but give the same result |
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194 |
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195 'a', start, end |
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196 Non-clashing insertion from a[start:end] |
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197 |
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198 Method is as follows: |
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199 |
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200 The two sequences align only on regions which match the base |
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201 and both descendants. These are found by doing a two-way diff |
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202 of each one against the base, and then finding the |
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203 intersections between those regions. These "sync regions" |
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204 are by definition unchanged in both and easily dealt with. |
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205 |
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206 The regions in between can be in any of three cases: |
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207 conflicted, or changed on only one side. |
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208 """ |
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209 |
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210 # section a[0:ia] has been disposed of, etc |
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211 iz = ia = ib = 0 |
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212 |
16683 | 213 for region in self.find_sync_regions(): |
214 zmatch, zend, amatch, aend, bmatch, bend = region | |
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215 #print 'match base [%d:%d]' % (zmatch, zend) |
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216 |
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217 matchlen = zend - zmatch |
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218 assert matchlen >= 0 |
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219 assert matchlen == (aend - amatch) |
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220 assert matchlen == (bend - bmatch) |
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221 |
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222 len_a = amatch - ia |
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223 len_b = bmatch - ib |
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224 len_base = zmatch - iz |
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225 assert len_a >= 0 |
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226 assert len_b >= 0 |
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227 assert len_base >= 0 |
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228 |
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229 #print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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230 |
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231 if len_a or len_b: |
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232 # try to avoid actually slicing the lists |
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233 equal_a = compare_range(self.a, ia, amatch, |
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234 self.base, iz, zmatch) |
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235 equal_b = compare_range(self.b, ib, bmatch, |
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236 self.base, iz, zmatch) |
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237 same = compare_range(self.a, ia, amatch, |
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238 self.b, ib, bmatch) |
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239 |
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240 if same: |
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241 yield 'same', ia, amatch |
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242 elif equal_a and not equal_b: |
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243 yield 'b', ib, bmatch |
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244 elif equal_b and not equal_a: |
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245 yield 'a', ia, amatch |
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246 elif not equal_a and not equal_b: |
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247 yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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248 else: |
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249 raise AssertionError("can't handle a=b=base but unmatched") |
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250 |
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251 ia = amatch |
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252 ib = bmatch |
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253 iz = zmatch |
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254 |
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255 # if the same part of the base was deleted on both sides |
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256 # that's OK, we can just skip it. |
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257 |
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258 |
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259 if matchlen > 0: |
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260 assert ia == amatch |
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261 assert ib == bmatch |
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262 assert iz == zmatch |
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263 |
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264 yield 'unchanged', zmatch, zend |
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265 iz = zend |
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266 ia = aend |
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267 ib = bend |
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268 |
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269 def find_sync_regions(self): |
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270 """Return a list of sync regions, where both descendants match the base. |
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271 |
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272 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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273 always a zero-length sync region at the end of all the files. |
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274 """ |
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275 |
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276 ia = ib = 0 |
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277 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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278 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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279 len_a = len(amatches) |
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280 len_b = len(bmatches) |
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281 |
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282 sl = [] |
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283 |
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284 while ia < len_a and ib < len_b: |
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285 abase, amatch, alen = amatches[ia] |
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286 bbase, bmatch, blen = bmatches[ib] |
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287 |
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288 # there is an unconflicted block at i; how long does it |
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289 # extend? until whichever one ends earlier. |
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290 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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291 if i: |
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292 intbase = i[0] |
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293 intend = i[1] |
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294 intlen = intend - intbase |
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295 |
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296 # found a match of base[i[0], i[1]]; this may be less than |
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297 # the region that matches in either one |
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298 assert intlen <= alen |
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299 assert intlen <= blen |
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300 assert abase <= intbase |
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301 assert bbase <= intbase |
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302 |
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303 asub = amatch + (intbase - abase) |
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304 bsub = bmatch + (intbase - bbase) |
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305 aend = asub + intlen |
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306 bend = bsub + intlen |
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307 |
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308 assert self.base[intbase:intend] == self.a[asub:aend], \ |
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309 (self.base[intbase:intend], self.a[asub:aend]) |
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310 |
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311 assert self.base[intbase:intend] == self.b[bsub:bend] |
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312 |
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313 sl.append((intbase, intend, |
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314 asub, aend, |
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315 bsub, bend)) |
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316 |
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317 # advance whichever one ends first in the base text |
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318 if (abase + alen) < (bbase + blen): |
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319 ia += 1 |
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320 else: |
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321 ib += 1 |
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322 |
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323 intbase = len(self.base) |
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324 abase = len(self.a) |
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325 bbase = len(self.b) |
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326 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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327 |
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328 return sl |
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329 |
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330 def find_unconflicted(self): |
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331 """Return a list of ranges in base that are not conflicted.""" |
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332 am = mdiff.get_matching_blocks(self.basetext, self.atext) |
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333 bm = mdiff.get_matching_blocks(self.basetext, self.btext) |
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334 |
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335 unc = [] |
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336 |
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337 while am and bm: |
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338 # there is an unconflicted block at i; how long does it |
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339 # extend? until whichever one ends earlier. |
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340 a1 = am[0][0] |
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341 a2 = a1 + am[0][2] |
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342 b1 = bm[0][0] |
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343 b2 = b1 + bm[0][2] |
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344 i = intersect((a1, a2), (b1, b2)) |
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345 if i: |
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346 unc.append(i) |
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347 |
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348 if a2 < b2: |
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349 del am[0] |
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350 else: |
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351 del bm[0] |
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352 |
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353 return unc |
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354 |
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355 def simplemerge(ui, local, base, other, **opts): |
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356 def readfile(filename): |
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357 f = open(filename, "rb") |
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358 text = f.read() |
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359 f.close() |
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360 if util.binary(text): |
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361 msg = _("%s looks like a binary file.") % filename |
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362 if not opts.get('quiet'): |
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363 ui.warn(_('warning: %s\n') % msg) |
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364 if not opts.get('text'): |
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365 raise error.Abort(msg) |
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366 return text |
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367 |
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368 mode = opts.get('mode','merge') |
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369 if mode == 'union': |
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370 name_a = None |
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371 name_b = None |
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372 name_base = None |
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373 else: |
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374 name_a = local |
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375 name_b = other |
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376 name_base = None |
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377 labels = opts.get('label', []) |
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378 if len(labels) > 0: |
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379 name_a = labels[0] |
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380 if len(labels) > 1: |
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381 name_b = labels[1] |
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382 if len(labels) > 2: |
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383 name_base = labels[2] |
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384 if len(labels) > 3: |
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385 raise error.Abort(_("can only specify three labels.")) |
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386 |
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387 try: |
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388 localtext = readfile(local) |
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389 basetext = readfile(base) |
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390 othertext = readfile(other) |
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391 except error.Abort: |
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392 return 1 |
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393 |
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394 local = os.path.realpath(local) |
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395 if not opts.get('print'): |
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396 opener = scmutil.opener(os.path.dirname(local)) |
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397 out = opener(os.path.basename(local), "w", atomictemp=True) |
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398 else: |
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399 out = sys.stdout |
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400 |
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401 m3 = Merge3Text(basetext, localtext, othertext) |
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402 extrakwargs = {"localorother": opts.get("localorother", None)} |
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403 if mode == 'union': |
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404 extrakwargs['start_marker'] = None |
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405 extrakwargs['mid_marker'] = None |
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406 extrakwargs['end_marker'] = None |
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407 elif name_base is not None: |
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408 extrakwargs['base_marker'] = '|||||||' |
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409 extrakwargs['name_base'] = name_base |
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410 for line in m3.merge_lines(name_a=name_a, name_b=name_b, **extrakwargs): |
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411 out.write(line) |
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412 |
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413 if not opts.get('print'): |
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414 out.close() |
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415 |
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416 if m3.conflicts and not mode == 'union': |
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417 return 1 |