Mercurial > hg
annotate mercurial/simplemerge.py @ 47072:4c041c71ec01
revlog: introduce an explicit tracking of what the revlog is about
Since the dawn of time, people have been forced to rely to lossy introspection
of the index filename to determine what the purpose and role of the revlog they
encounter is. This is hacky, error prone, inflexible, abstraction-leaky,
<insert-your-own-complaints-here>.
In f63299ee7e4d Raphaël introduced a new attribute to track this information:
`revlog_kind`. However it is initialized in an odd place and various instances
end up not having it set. In addition is only tracking some of the information
we end up having to introspect in various pieces of code.
So we add a new attribute that holds more data and is more strictly enforced.
This work is done in collaboration with Raphaël.
The `revlog_kind` one will be removed/adapted in the next changeset. We expect
to be able to clean up various existing piece of code and to simplify coming
work around the newer revlog format.
Differential Revision: https://phab.mercurial-scm.org/D10352
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 06 Apr 2021 05:20:24 +0200 |
parents | 728d89f6f9b1 |
children | 9e1f174d305b |
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 from .i18n import _ |
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22 from .node import nullrev |
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23 from . import ( |
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24 error, |
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25 mdiff, |
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26 pycompat, |
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27 util, |
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28 ) |
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29 from .utils import stringutil |
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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 |
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36 def intersect(ra, rb): |
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37 """Given two ranges return the range where they intersect or None. |
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38 |
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39 >>> intersect((0, 10), (0, 6)) |
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40 (0, 6) |
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41 >>> intersect((0, 10), (5, 15)) |
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42 (5, 10) |
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43 >>> intersect((0, 10), (10, 15)) |
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44 >>> intersect((0, 9), (10, 15)) |
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45 >>> intersect((0, 9), (7, 15)) |
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46 (7, 9) |
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47 """ |
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48 assert ra[0] <= ra[1] |
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49 assert rb[0] <= rb[1] |
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50 |
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51 sa = max(ra[0], rb[0]) |
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52 sb = min(ra[1], rb[1]) |
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53 if sa < sb: |
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54 return sa, sb |
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55 else: |
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56 return None |
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57 |
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58 |
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59 def compare_range(a, astart, aend, b, bstart, bend): |
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60 """Compare a[astart:aend] == b[bstart:bend], without slicing.""" |
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61 if (aend - astart) != (bend - bstart): |
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62 return False |
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63 for ia, ib in zip( |
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64 pycompat.xrange(astart, aend), pycompat.xrange(bstart, bend) |
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65 ): |
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66 if a[ia] != b[ib]: |
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67 return False |
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68 else: |
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69 return True |
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70 |
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71 |
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72 class Merge3Text(object): |
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73 """3-way merge of texts. |
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74 |
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75 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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76 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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77 |
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78 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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79 self.basetext = basetext |
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80 self.atext = atext |
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81 self.btext = btext |
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82 if base is None: |
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83 base = mdiff.splitnewlines(basetext) |
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84 if a is None: |
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85 a = mdiff.splitnewlines(atext) |
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86 if b is None: |
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87 b = mdiff.splitnewlines(btext) |
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88 self.base = base |
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89 self.a = a |
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90 self.b = b |
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91 |
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92 def merge_lines( |
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93 self, |
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94 name_a=None, |
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95 name_b=None, |
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96 name_base=None, |
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97 start_marker=b'<<<<<<<', |
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98 mid_marker=b'=======', |
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99 end_marker=b'>>>>>>>', |
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100 base_marker=None, |
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101 localorother=None, |
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102 minimize=False, |
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103 ): |
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104 """Return merge in cvs-like form.""" |
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105 self.conflicts = False |
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106 newline = b'\n' |
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107 if len(self.a) > 0: |
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108 if self.a[0].endswith(b'\r\n'): |
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109 newline = b'\r\n' |
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110 elif self.a[0].endswith(b'\r'): |
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111 newline = b'\r' |
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112 if name_a and start_marker: |
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113 start_marker = start_marker + b' ' + name_a |
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114 if name_b and end_marker: |
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115 end_marker = end_marker + b' ' + name_b |
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116 if name_base and base_marker: |
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117 base_marker = base_marker + b' ' + name_base |
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118 merge_regions = self.merge_regions() |
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119 if minimize: |
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120 merge_regions = self.minimize(merge_regions) |
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121 for t in merge_regions: |
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122 what = t[0] |
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123 if what == b'unchanged': |
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124 for i in range(t[1], t[2]): |
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125 yield self.base[i] |
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126 elif what == b'a' or what == b'same': |
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127 for i in range(t[1], t[2]): |
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128 yield self.a[i] |
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129 elif what == b'b': |
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130 for i in range(t[1], t[2]): |
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131 yield self.b[i] |
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132 elif what == b'conflict': |
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133 if localorother == b'local': |
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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 elif localorother == b'other': |
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137 for i in range(t[5], t[6]): |
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138 yield self.b[i] |
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139 else: |
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140 self.conflicts = True |
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141 if start_marker is not None: |
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142 yield start_marker + newline |
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143 for i in range(t[3], t[4]): |
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144 yield self.a[i] |
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145 if base_marker is not None: |
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146 yield base_marker + newline |
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147 for i in range(t[1], t[2]): |
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148 yield self.base[i] |
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149 if mid_marker is not None: |
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150 yield mid_marker + newline |
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151 for i in range(t[5], t[6]): |
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152 yield self.b[i] |
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153 if end_marker is not None: |
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154 yield end_marker + newline |
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155 else: |
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156 raise ValueError(what) |
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157 |
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158 def merge_groups(self): |
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159 """Yield sequence of line groups. Each one is a tuple: |
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160 |
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161 'unchanged', lines |
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162 Lines unchanged from base |
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163 |
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164 'a', lines |
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165 Lines taken from a |
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166 |
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167 'same', lines |
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168 Lines taken from a (and equal to b) |
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169 |
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170 'b', lines |
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171 Lines taken from b |
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172 |
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173 'conflict', base_lines, a_lines, b_lines |
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174 Lines from base were changed to either a or b and conflict. |
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175 """ |
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176 for t in self.merge_regions(): |
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177 what = t[0] |
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178 if what == b'unchanged': |
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179 yield what, self.base[t[1] : t[2]] |
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180 elif what == b'a' or what == b'same': |
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181 yield what, self.a[t[1] : t[2]] |
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182 elif what == b'b': |
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183 yield what, self.b[t[1] : t[2]] |
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184 elif what == b'conflict': |
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185 yield ( |
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186 what, |
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187 self.base[t[1] : t[2]], |
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188 self.a[t[3] : t[4]], |
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189 self.b[t[5] : t[6]], |
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190 ) |
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191 else: |
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192 raise ValueError(what) |
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193 |
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194 def merge_regions(self): |
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195 """Return sequences of matching and conflicting regions. |
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196 |
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197 This returns tuples, where the first value says what kind we |
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198 have: |
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199 |
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200 'unchanged', start, end |
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201 Take a region of base[start:end] |
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202 |
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203 'same', astart, aend |
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204 b and a are different from base but give the same result |
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205 |
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206 'a', start, end |
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207 Non-clashing insertion from a[start:end] |
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208 |
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209 'conflict', zstart, zend, astart, aend, bstart, bend |
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210 Conflict between a and b, with z as common ancestor |
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211 |
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212 Method is as follows: |
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213 |
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214 The two sequences align only on regions which match the base |
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215 and both descendants. These are found by doing a two-way diff |
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216 of each one against the base, and then finding the |
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217 intersections between those regions. These "sync regions" |
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218 are by definition unchanged in both and easily dealt with. |
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219 |
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220 The regions in between can be in any of three cases: |
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221 conflicted, or changed on only one side. |
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222 """ |
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223 |
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224 # section a[0:ia] has been disposed of, etc |
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225 iz = ia = ib = 0 |
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226 |
16683 | 227 for region in self.find_sync_regions(): |
228 zmatch, zend, amatch, aend, bmatch, bend = region | |
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229 # print 'match base [%d:%d]' % (zmatch, zend) |
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230 |
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231 matchlen = zend - zmatch |
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232 assert matchlen >= 0 |
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233 assert matchlen == (aend - amatch) |
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234 assert matchlen == (bend - bmatch) |
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235 |
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236 len_a = amatch - ia |
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237 len_b = bmatch - ib |
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238 len_base = zmatch - iz |
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239 assert len_a >= 0 |
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240 assert len_b >= 0 |
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241 assert len_base >= 0 |
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242 |
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243 # print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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244 |
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245 if len_a or len_b: |
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246 # try to avoid actually slicing the lists |
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247 equal_a = compare_range( |
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248 self.a, ia, amatch, self.base, iz, zmatch |
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249 ) |
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250 equal_b = compare_range( |
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251 self.b, ib, bmatch, self.base, iz, zmatch |
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252 ) |
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253 same = compare_range(self.a, ia, amatch, self.b, ib, bmatch) |
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254 |
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255 if same: |
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256 yield b'same', ia, amatch |
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257 elif equal_a and not equal_b: |
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258 yield b'b', ib, bmatch |
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259 elif equal_b and not equal_a: |
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260 yield b'a', ia, amatch |
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261 elif not equal_a and not equal_b: |
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262 yield b'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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263 else: |
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264 raise AssertionError(b"can't handle a=b=base but unmatched") |
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265 |
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266 ia = amatch |
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267 ib = bmatch |
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268 iz = zmatch |
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269 |
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270 # if the same part of the base was deleted on both sides |
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271 # that's OK, we can just skip it. |
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272 |
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273 if matchlen > 0: |
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274 assert ia == amatch |
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275 assert ib == bmatch |
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276 assert iz == zmatch |
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277 |
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278 yield b'unchanged', zmatch, zend |
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279 iz = zend |
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280 ia = aend |
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281 ib = bend |
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282 |
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283 def minimize(self, merge_regions): |
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284 """Trim conflict regions of lines where A and B sides match. |
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285 |
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286 Lines where both A and B have made the same changes at the beginning |
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287 or the end of each merge region are eliminated from the conflict |
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288 region and are instead considered the same. |
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289 """ |
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290 for region in merge_regions: |
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291 if region[0] != b"conflict": |
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292 yield region |
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293 continue |
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294 # pytype thinks this tuple contains only 3 things, but |
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295 # that's clearly not true because this code successfully |
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296 # executes. It might be wise to rework merge_regions to be |
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297 # some kind of attrs type. |
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298 ( |
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299 issue, |
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300 z1, |
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301 z2, |
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302 a1, |
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303 a2, |
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304 b1, |
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305 b2, |
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306 ) = region # pytype: disable=bad-unpacking |
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307 alen = a2 - a1 |
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308 blen = b2 - b1 |
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309 |
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310 # find matches at the front |
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311 ii = 0 |
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312 while ( |
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313 ii < alen and ii < blen and self.a[a1 + ii] == self.b[b1 + ii] |
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314 ): |
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315 ii += 1 |
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316 startmatches = ii |
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317 |
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318 # find matches at the end |
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319 ii = 0 |
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320 while ( |
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321 ii < alen |
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322 and ii < blen |
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323 and self.a[a2 - ii - 1] == self.b[b2 - ii - 1] |
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324 ): |
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325 ii += 1 |
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326 endmatches = ii |
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327 |
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328 if startmatches > 0: |
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329 yield b'same', a1, a1 + startmatches |
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330 |
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331 yield ( |
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332 b'conflict', |
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333 z1, |
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334 z2, |
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335 a1 + startmatches, |
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336 a2 - endmatches, |
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337 b1 + startmatches, |
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338 b2 - endmatches, |
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339 ) |
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340 |
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341 if endmatches > 0: |
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342 yield b'same', a2 - endmatches, a2 |
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343 |
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344 def find_sync_regions(self): |
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345 """Return a list of sync regions, where both descendants match the base. |
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346 |
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347 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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348 always a zero-length sync region at the end of all the files. |
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349 """ |
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350 |
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351 ia = ib = 0 |
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352 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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353 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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354 len_a = len(amatches) |
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355 len_b = len(bmatches) |
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356 |
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357 sl = [] |
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358 |
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359 while ia < len_a and ib < len_b: |
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360 abase, amatch, alen = amatches[ia] |
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361 bbase, bmatch, blen = bmatches[ib] |
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362 |
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363 # there is an unconflicted block at i; how long does it |
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364 # extend? until whichever one ends earlier. |
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365 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
4362
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366 if i: |
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367 intbase = i[0] |
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368 intend = i[1] |
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369 intlen = intend - intbase |
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370 |
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371 # found a match of base[i[0], i[1]]; this may be less than |
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372 # the region that matches in either one |
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373 assert intlen <= alen |
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374 assert intlen <= blen |
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375 assert abase <= intbase |
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376 assert bbase <= intbase |
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377 |
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378 asub = amatch + (intbase - abase) |
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379 bsub = bmatch + (intbase - bbase) |
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380 aend = asub + intlen |
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381 bend = bsub + intlen |
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382 |
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383 assert self.base[intbase:intend] == self.a[asub:aend], ( |
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384 self.base[intbase:intend], |
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385 self.a[asub:aend], |
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386 ) |
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387 |
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388 assert self.base[intbase:intend] == self.b[bsub:bend] |
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389 |
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390 sl.append((intbase, intend, asub, aend, bsub, bend)) |
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391 |
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392 # advance whichever one ends first in the base text |
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393 if (abase + alen) < (bbase + blen): |
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394 ia += 1 |
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395 else: |
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396 ib += 1 |
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397 |
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398 intbase = len(self.base) |
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399 abase = len(self.a) |
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400 bbase = len(self.b) |
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401 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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402 |
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403 return sl |
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404 |
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405 |
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406 def _verifytext(text, path, ui, opts): |
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407 """verifies that text is non-binary (unless opts[text] is passed, |
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408 then we just warn)""" |
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409 if stringutil.binary(text): |
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410 msg = _(b"%s looks like a binary file.") % path |
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411 if not opts.get('quiet'): |
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412 ui.warn(_(b'warning: %s\n') % msg) |
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413 if not opts.get('text'): |
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414 raise error.Abort(msg) |
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415 return text |
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416 |
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417 |
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418 def _picklabels(defaults, overrides): |
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419 if len(overrides) > 3: |
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420 raise error.Abort(_(b"can only specify three labels.")) |
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421 result = defaults[:] |
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422 for i, override in enumerate(overrides): |
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423 result[i] = override |
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424 return result |
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425 |
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426 |
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427 def is_not_null(ctx): |
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428 if not util.safehasattr(ctx, "node"): |
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429 return False |
46843
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refactor: prefer checks against nullrev over nullid
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430 return ctx.rev() != nullrev |
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431 |
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432 |
46108
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433 def _mergediff(m3, name_a, name_b, name_base): |
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434 lines = [] |
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435 conflicts = False |
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436 for group in m3.merge_groups(): |
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437 if group[0] == b'conflict': |
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438 base_lines, a_lines, b_lines = group[1:] |
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439 base_text = b''.join(base_lines) |
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440 b_blocks = list( |
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441 mdiff.allblocks( |
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442 base_text, |
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443 b''.join(b_lines), |
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444 lines1=base_lines, |
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445 lines2=b_lines, |
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446 ) |
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447 ) |
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448 a_blocks = list( |
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449 mdiff.allblocks( |
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450 base_text, |
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451 b''.join(a_lines), |
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452 lines1=base_lines, |
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453 lines2=b_lines, |
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454 ) |
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455 ) |
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456 |
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457 def matching_lines(blocks): |
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458 return sum( |
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459 block[1] - block[0] |
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460 for block, kind in blocks |
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461 if kind == b'=' |
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462 ) |
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463 |
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464 def diff_lines(blocks, lines1, lines2): |
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465 for block, kind in blocks: |
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466 if kind == b'=': |
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467 for line in lines1[block[0] : block[1]]: |
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468 yield b' ' + line |
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469 else: |
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470 for line in lines1[block[0] : block[1]]: |
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471 yield b'-' + line |
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472 for line in lines2[block[2] : block[3]]: |
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473 yield b'+' + line |
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474 |
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475 lines.append(b"<<<<<<<\n") |
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476 if matching_lines(a_blocks) < matching_lines(b_blocks): |
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477 lines.append(b"======= %s\n" % name_a) |
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478 lines.extend(a_lines) |
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479 lines.append(b"------- %s\n" % name_base) |
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480 lines.append(b"+++++++ %s\n" % name_b) |
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481 lines.extend(diff_lines(b_blocks, base_lines, b_lines)) |
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482 else: |
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483 lines.append(b"------- %s\n" % name_base) |
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484 lines.append(b"+++++++ %s\n" % name_a) |
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485 lines.extend(diff_lines(a_blocks, base_lines, a_lines)) |
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486 lines.append(b"======= %s\n" % name_b) |
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487 lines.extend(b_lines) |
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488 lines.append(b">>>>>>>\n") |
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489 conflicts = True |
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490 else: |
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491 lines.extend(group[1]) |
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492 return lines, conflicts |
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493 |
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494 |
34049
6330df9d6393
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495 def simplemerge(ui, localctx, basectx, otherctx, **opts): |
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496 """Performs the simplemerge algorithm. |
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497 |
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498 The merged result is written into `localctx`. |
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499 """ |
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500 |
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501 def readctx(ctx): |
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502 # Merges were always run in the working copy before, which means |
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503 # they used decoded data, if the user defined any repository |
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504 # filters. |
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505 # |
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506 # Maintain that behavior today for BC, though perhaps in the future |
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507 # it'd be worth considering whether merging encoded data (what the |
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508 # repository usually sees) might be more useful. |
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509 return _verifytext(ctx.decodeddata(), ctx.path(), ui, opts) |
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510 |
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511 mode = opts.get('mode', b'merge') |
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512 name_a, name_b, name_base = None, None, None |
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513 if mode != b'union': |
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514 name_a, name_b, name_base = _picklabels( |
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515 [localctx.path(), otherctx.path(), None], opts.get('label', []) |
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516 ) |
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517 |
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518 try: |
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519 localtext = readctx(localctx) |
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520 basetext = readctx(basectx) |
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521 othertext = readctx(otherctx) |
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522 except error.Abort: |
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523 return 1 |
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524 |
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525 m3 = Merge3Text(basetext, localtext, othertext) |
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526 extrakwargs = { |
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527 b"localorother": opts.get("localorother", None), |
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528 b'minimize': True, |
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529 } |
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530 if mode == b'union': |
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531 extrakwargs[b'start_marker'] = None |
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532 extrakwargs[b'mid_marker'] = None |
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533 extrakwargs[b'end_marker'] = None |
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534 elif name_base is not None: |
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535 extrakwargs[b'base_marker'] = b'|||||||' |
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536 extrakwargs[b'name_base'] = name_base |
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537 extrakwargs[b'minimize'] = False |
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538 |
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539 if mode == b'mergediff': |
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540 lines, conflicts = _mergediff(m3, name_a, name_b, name_base) |
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541 else: |
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542 lines = list( |
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543 m3.merge_lines( |
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544 name_a=name_a, name_b=name_b, **pycompat.strkwargs(extrakwargs) |
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545 ) |
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|
546 ) |
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547 conflicts = m3.conflicts |
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548 |
44911
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|
549 # merge flags if necessary |
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|
550 flags = localctx.flags() |
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551 localflags = set(pycompat.iterbytestr(flags)) |
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552 otherflags = set(pycompat.iterbytestr(otherctx.flags())) |
44947
ad6971e6740c
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diff
changeset
|
553 if is_not_null(basectx) and localflags != otherflags: |
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554 baseflags = set(pycompat.iterbytestr(basectx.flags())) |
44949
4bb0ea78a70f
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|
555 commonflags = localflags & otherflags |
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diff
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|
556 addedflags = (localflags ^ otherflags) - baseflags |
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557 flags = b''.join(sorted(commonflags | addedflags)) |
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|
558 |
46100
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|
559 mergedtext = b''.join(lines) |
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|
560 if opts.get('print'): |
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|
561 ui.fout.write(mergedtext) |
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|
562 else: |
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|
563 localctx.write(mergedtext, flags) |
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|
564 |
46108
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|
565 if conflicts and not mode == b'union': |
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changeset
|
566 return 1 |