Mercurial > hg
annotate mercurial/simplemerge.py @ 48587:3c8cc987672e
simplemerge: take over formatting of label from `filemerge`
The padding we do of conflict labels depends on which conflict marker
style is used. For two-way conflict markers (the default), the length
of the base label shouldn't matter. It does before this patch,
however. This patch moves the formatting from `filemerge` to
`simplemerge`. The latter knows which conflict marker style to use, so
it can easily decide about the padding.
This change will allow us to use more descriptive "base" labels
without causing illogical padding in 2-way markers. I'll do that next.
One wrinkle is that we pass the same labels to external merge tools. I
decided to change that in this patch to be simpler: no padding, and no
ellipsis to fit within 80 columns. My reasoning is that the typical
external, 3-or-4-panel merge tool doesn't show the labels on top of
each others, so the padding doesn't make sense there. The ellipsis is
probably not necessary because the external tools probably have their
own way of dealing with long labels. Also, we limit them to "80 - 8"
to fit the "<<<<<<< " before, which is almost definitely not what an
external tool would put there.
Differential Revision: https://phab.mercurial-scm.org/D12019
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Thu, 20 Jan 2022 11:06:52 -0800 |
parents | 77e24ee8994b |
children | 9ee70e175fed |
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 .thirdparty import attr |
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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 ) |
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28 from .utils import stringutil |
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29 |
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30 |
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31 def intersect(ra, rb): |
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32 """Given two ranges return the range where they intersect or None. |
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33 |
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34 >>> intersect((0, 10), (0, 6)) |
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35 (0, 6) |
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36 >>> intersect((0, 10), (5, 15)) |
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37 (5, 10) |
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38 >>> intersect((0, 10), (10, 15)) |
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39 >>> intersect((0, 9), (10, 15)) |
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40 >>> intersect((0, 9), (7, 15)) |
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41 (7, 9) |
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42 """ |
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43 assert ra[0] <= ra[1] |
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44 assert rb[0] <= rb[1] |
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45 |
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46 sa = max(ra[0], rb[0]) |
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47 sb = min(ra[1], rb[1]) |
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48 if sa < sb: |
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49 return sa, sb |
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50 else: |
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51 return None |
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52 |
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53 |
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54 def compare_range(a, astart, aend, b, bstart, bend): |
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55 """Compare a[astart:aend] == b[bstart:bend], without slicing.""" |
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56 if (aend - astart) != (bend - bstart): |
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57 return False |
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58 for ia, ib in zip( |
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59 pycompat.xrange(astart, aend), pycompat.xrange(bstart, bend) |
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60 ): |
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61 if a[ia] != b[ib]: |
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62 return False |
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63 else: |
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64 return True |
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65 |
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66 |
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67 class Merge3Text(object): |
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68 """3-way merge of texts. |
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69 |
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70 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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71 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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72 |
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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_groups(self): |
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88 """Yield sequence of line groups. Each one is a tuple: |
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89 |
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90 'unchanged', lines |
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91 Lines unchanged from base |
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92 |
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93 'a', lines |
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94 Lines taken from a |
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95 |
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96 'same', lines |
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97 Lines taken from a (and equal to b) |
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98 |
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99 'b', lines |
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100 Lines taken from b |
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101 |
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102 'conflict', (base_lines, a_lines, b_lines) |
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103 Lines from base were changed to either a or b and conflict. |
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104 """ |
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105 for t in self.merge_regions(): |
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106 what = t[0] |
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107 if what == b'unchanged': |
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108 yield what, self.base[t[1] : t[2]] |
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109 elif what == b'a' or what == b'same': |
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110 yield what, self.a[t[1] : t[2]] |
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111 elif what == b'b': |
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112 yield what, self.b[t[1] : t[2]] |
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113 elif what == b'conflict': |
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114 yield ( |
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115 what, |
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116 ( |
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117 self.base[t[1] : t[2]], |
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118 self.a[t[3] : t[4]], |
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119 self.b[t[5] : t[6]], |
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120 ), |
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121 ) |
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122 else: |
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123 raise ValueError(what) |
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124 |
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125 def merge_regions(self): |
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126 """Return sequences of matching and conflicting regions. |
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127 |
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128 This returns tuples, where the first value says what kind we |
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129 have: |
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130 |
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131 'unchanged', start, end |
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132 Take a region of base[start:end] |
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133 |
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134 'same', astart, aend |
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135 b and a are different from base but give the same result |
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136 |
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137 'a', start, end |
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138 Non-clashing insertion from a[start:end] |
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139 |
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140 'conflict', zstart, zend, astart, aend, bstart, bend |
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141 Conflict between a and b, with z as common ancestor |
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142 |
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143 Method is as follows: |
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144 |
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145 The two sequences align only on regions which match the base |
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146 and both descendants. These are found by doing a two-way diff |
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147 of each one against the base, and then finding the |
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148 intersections between those regions. These "sync regions" |
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149 are by definition unchanged in both and easily dealt with. |
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150 |
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151 The regions in between can be in any of three cases: |
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152 conflicted, or changed on only one side. |
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153 """ |
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154 |
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155 # section a[0:ia] has been disposed of, etc |
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156 iz = ia = ib = 0 |
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157 |
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159 zmatch, zend, amatch, aend, bmatch, bend = region | |
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160 # print 'match base [%d:%d]' % (zmatch, zend) |
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161 |
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162 matchlen = zend - zmatch |
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163 assert matchlen >= 0 |
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164 assert matchlen == (aend - amatch) |
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165 assert matchlen == (bend - bmatch) |
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166 |
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167 len_a = amatch - ia |
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168 len_b = bmatch - ib |
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169 len_base = zmatch - iz |
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170 assert len_a >= 0 |
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171 assert len_b >= 0 |
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172 assert len_base >= 0 |
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173 |
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174 # print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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175 |
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176 if len_a or len_b: |
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177 # try to avoid actually slicing the lists |
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178 equal_a = compare_range( |
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179 self.a, ia, amatch, self.base, iz, zmatch |
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180 ) |
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181 equal_b = compare_range( |
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182 self.b, ib, bmatch, self.base, iz, zmatch |
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183 ) |
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184 same = compare_range(self.a, ia, amatch, self.b, ib, bmatch) |
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185 |
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186 if same: |
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187 yield b'same', ia, amatch |
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188 elif equal_a and not equal_b: |
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189 yield b'b', ib, bmatch |
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190 elif equal_b and not equal_a: |
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191 yield b'a', ia, amatch |
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192 elif not equal_a and not equal_b: |
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193 yield b'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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194 else: |
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195 raise AssertionError(b"can't handle a=b=base but unmatched") |
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196 |
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197 ia = amatch |
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198 ib = bmatch |
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199 iz = zmatch |
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200 |
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201 # if the same part of the base was deleted on both sides |
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202 # that's OK, we can just skip it. |
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203 |
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204 if matchlen > 0: |
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205 assert ia == amatch |
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206 assert ib == bmatch |
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207 assert iz == zmatch |
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208 |
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209 yield b'unchanged', zmatch, zend |
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210 iz = zend |
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211 ia = aend |
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212 ib = bend |
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213 |
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214 def find_sync_regions(self): |
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215 """Return a list of sync regions, where both descendants match the base. |
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216 |
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217 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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218 always a zero-length sync region at the end of all the files. |
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219 """ |
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220 |
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221 ia = ib = 0 |
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222 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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223 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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224 len_a = len(amatches) |
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225 len_b = len(bmatches) |
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226 |
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227 sl = [] |
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228 |
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229 while ia < len_a and ib < len_b: |
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230 abase, amatch, alen = amatches[ia] |
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231 bbase, bmatch, blen = bmatches[ib] |
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232 |
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233 # there is an unconflicted block at i; how long does it |
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234 # extend? until whichever one ends earlier. |
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235 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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236 if i: |
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237 intbase = i[0] |
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238 intend = i[1] |
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239 intlen = intend - intbase |
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240 |
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241 # found a match of base[i[0], i[1]]; this may be less than |
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242 # the region that matches in either one |
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243 assert intlen <= alen |
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244 assert intlen <= blen |
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245 assert abase <= intbase |
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246 assert bbase <= intbase |
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247 |
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248 asub = amatch + (intbase - abase) |
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249 bsub = bmatch + (intbase - bbase) |
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250 aend = asub + intlen |
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251 bend = bsub + intlen |
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252 |
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253 assert self.base[intbase:intend] == self.a[asub:aend], ( |
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254 self.base[intbase:intend], |
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255 self.a[asub:aend], |
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256 ) |
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257 |
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258 assert self.base[intbase:intend] == self.b[bsub:bend] |
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259 |
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260 sl.append((intbase, intend, asub, aend, bsub, bend)) |
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261 |
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262 # advance whichever one ends first in the base text |
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263 if (abase + alen) < (bbase + blen): |
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264 ia += 1 |
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265 else: |
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266 ib += 1 |
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267 |
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268 intbase = len(self.base) |
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269 abase = len(self.a) |
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270 bbase = len(self.b) |
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271 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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272 |
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273 return sl |
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274 |
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275 |
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276 def _verifytext(text, path, ui, opts): |
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277 """verifies that text is non-binary (unless opts[text] is passed, |
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278 then we just warn)""" |
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279 if stringutil.binary(text): |
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280 msg = _(b"%s looks like a binary file.") % path |
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281 if not opts.get('quiet'): |
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282 ui.warn(_(b'warning: %s\n') % msg) |
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283 if not opts.get('text'): |
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284 raise error.Abort(msg) |
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285 return text |
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286 |
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287 |
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288 def _format_labels(*inputs): |
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289 pad = max(len(input.label) if input.label else 0 for input in inputs) |
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290 labels = [] |
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291 for input in inputs: |
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292 if input.label: |
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293 if input.label_detail: |
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294 label = ( |
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295 (input.label + b':').ljust(pad + 1) |
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296 + b' ' |
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297 + input.label_detail |
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298 ) |
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299 else: |
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300 label = input.label |
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301 # 8 for the prefix of conflict marker lines (e.g. '<<<<<<< ') |
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302 labels.append(stringutil.ellipsis(label, 80 - 8)) |
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303 else: |
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304 labels.append(None) |
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305 return labels |
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306 |
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307 |
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308 def _detect_newline(m3): |
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309 if len(m3.a) > 0: |
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310 if m3.a[0].endswith(b'\r\n'): |
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311 return b'\r\n' |
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312 elif m3.a[0].endswith(b'\r'): |
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313 return b'\r' |
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314 return b'\n' |
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315 |
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316 |
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317 def _minimize(a_lines, b_lines): |
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318 """Trim conflict regions of lines where A and B sides match. |
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319 |
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320 Lines where both A and B have made the same changes at the beginning |
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321 or the end of each merge region are eliminated from the conflict |
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322 region and are instead considered the same. |
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323 """ |
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324 alen = len(a_lines) |
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325 blen = len(b_lines) |
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326 |
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327 # find matches at the front |
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328 ii = 0 |
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329 while ii < alen and ii < blen and a_lines[ii] == b_lines[ii]: |
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330 ii += 1 |
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331 startmatches = ii |
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332 |
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333 # find matches at the end |
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334 ii = 0 |
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335 while ii < alen and ii < blen and a_lines[-ii - 1] == b_lines[-ii - 1]: |
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336 ii += 1 |
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337 endmatches = ii |
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338 |
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339 lines_before = a_lines[:startmatches] |
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340 new_a_lines = a_lines[startmatches : alen - endmatches] |
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341 new_b_lines = b_lines[startmatches : blen - endmatches] |
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342 lines_after = a_lines[alen - endmatches :] |
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343 return lines_before, new_a_lines, new_b_lines, lines_after |
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344 |
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345 |
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346 def render_minimized( |
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347 m3, |
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348 name_a=None, |
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349 name_b=None, |
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350 start_marker=b'<<<<<<<', |
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351 mid_marker=b'=======', |
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352 end_marker=b'>>>>>>>', |
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353 ): |
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354 """Return merge in cvs-like form.""" |
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355 newline = _detect_newline(m3) |
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356 conflicts = False |
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357 if name_a: |
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358 start_marker = start_marker + b' ' + name_a |
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359 if name_b: |
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360 end_marker = end_marker + b' ' + name_b |
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361 merge_groups = m3.merge_groups() |
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362 lines = [] |
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363 for what, group_lines in merge_groups: |
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364 if what == b'conflict': |
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365 conflicts = True |
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366 base_lines, a_lines, b_lines = group_lines |
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367 minimized = _minimize(a_lines, b_lines) |
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368 lines_before, a_lines, b_lines, lines_after = minimized |
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369 lines.extend(lines_before) |
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370 lines.append(start_marker + newline) |
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371 lines.extend(a_lines) |
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372 lines.append(mid_marker + newline) |
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373 lines.extend(b_lines) |
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374 lines.append(end_marker + newline) |
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375 lines.extend(lines_after) |
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376 else: |
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377 lines.extend(group_lines) |
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378 return lines, conflicts |
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379 |
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380 |
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381 def render_merge3(m3, name_a, name_b, name_base): |
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382 """Render conflicts as 3-way conflict markers.""" |
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383 newline = _detect_newline(m3) |
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384 conflicts = False |
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385 lines = [] |
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386 for what, group_lines in m3.merge_groups(): |
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387 if what == b'conflict': |
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388 base_lines, a_lines, b_lines = group_lines |
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389 conflicts = True |
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390 lines.append(b'<<<<<<< ' + name_a + newline) |
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391 lines.extend(a_lines) |
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392 lines.append(b'||||||| ' + name_base + newline) |
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393 lines.extend(base_lines) |
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394 lines.append(b'=======' + newline) |
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395 lines.extend(b_lines) |
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396 lines.append(b'>>>>>>> ' + name_b + newline) |
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397 else: |
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398 lines.extend(group_lines) |
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399 return lines, conflicts |
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400 |
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401 |
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402 def render_mergediff(m3, name_a, name_b, name_base): |
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403 """Render conflicts as conflict markers with one snapshot and one diff.""" |
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404 newline = _detect_newline(m3) |
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405 lines = [] |
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406 conflicts = False |
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407 for what, group_lines in m3.merge_groups(): |
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408 if what == b'conflict': |
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409 base_lines, a_lines, b_lines = group_lines |
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410 base_text = b''.join(base_lines) |
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411 b_blocks = list( |
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412 mdiff.allblocks( |
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413 base_text, |
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414 b''.join(b_lines), |
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415 lines1=base_lines, |
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416 lines2=b_lines, |
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417 ) |
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418 ) |
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419 a_blocks = list( |
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420 mdiff.allblocks( |
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421 base_text, |
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422 b''.join(a_lines), |
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423 lines1=base_lines, |
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424 lines2=b_lines, |
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425 ) |
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426 ) |
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427 |
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428 def matching_lines(blocks): |
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429 return sum( |
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430 block[1] - block[0] |
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431 for block, kind in blocks |
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432 if kind == b'=' |
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433 ) |
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434 |
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435 def diff_lines(blocks, lines1, lines2): |
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436 for block, kind in blocks: |
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437 if kind == b'=': |
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438 for line in lines1[block[0] : block[1]]: |
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439 yield b' ' + line |
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440 else: |
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441 for line in lines1[block[0] : block[1]]: |
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442 yield b'-' + line |
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443 for line in lines2[block[2] : block[3]]: |
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444 yield b'+' + line |
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445 |
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446 lines.append(b"<<<<<<<" + newline) |
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447 if matching_lines(a_blocks) < matching_lines(b_blocks): |
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448 lines.append(b"======= " + name_a + newline) |
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449 lines.extend(a_lines) |
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450 lines.append(b"------- " + name_base + newline) |
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451 lines.append(b"+++++++ " + name_b + newline) |
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452 lines.extend(diff_lines(b_blocks, base_lines, b_lines)) |
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453 else: |
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454 lines.append(b"------- " + name_base + newline) |
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455 lines.append(b"+++++++ " + name_a + newline) |
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456 lines.extend(diff_lines(a_blocks, base_lines, a_lines)) |
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457 lines.append(b"======= " + name_b + newline) |
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458 lines.extend(b_lines) |
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459 lines.append(b">>>>>>>" + newline) |
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460 conflicts = True |
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461 else: |
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462 lines.extend(group_lines) |
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463 return lines, conflicts |
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464 |
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465 |
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466 def _resolve(m3, sides): |
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467 lines = [] |
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468 for what, group_lines in m3.merge_groups(): |
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469 if what == b'conflict': |
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470 for side in sides: |
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471 lines.extend(group_lines[side]) |
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472 else: |
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473 lines.extend(group_lines) |
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474 return lines |
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475 |
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476 |
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477 @attr.s |
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478 class MergeInput(object): |
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479 fctx = attr.ib() |
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480 label = attr.ib(default=None) |
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481 # If the "detail" part is set, then that is rendered after the label and |
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482 # separated by a ':'. The label is padded to make the ':' aligned among all |
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483 # merge inputs. |
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484 label_detail = attr.ib(default=None) |
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485 |
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486 |
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487 def simplemerge(ui, local, base, other, **opts): |
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488 """Performs the simplemerge algorithm. |
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489 |
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490 The merged result is written into `localctx`. |
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491 """ |
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492 |
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493 def readctx(ctx): |
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494 # Merges were always run in the working copy before, which means |
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495 # they used decoded data, if the user defined any repository |
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496 # filters. |
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497 # |
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498 # Maintain that behavior today for BC, though perhaps in the future |
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499 # it'd be worth considering whether merging encoded data (what the |
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500 # repository usually sees) might be more useful. |
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501 return _verifytext(ctx.decodeddata(), ctx.path(), ui, opts) |
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502 |
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503 try: |
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504 localtext = readctx(local.fctx) |
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505 basetext = readctx(base.fctx) |
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506 othertext = readctx(other.fctx) |
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507 except error.Abort: |
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508 return True |
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509 |
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510 m3 = Merge3Text(basetext, localtext, othertext) |
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511 conflicts = False |
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512 mode = opts.get('mode', b'merge') |
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513 if mode == b'union': |
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514 lines = _resolve(m3, (1, 2)) |
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515 elif mode == b'local': |
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516 lines = _resolve(m3, (1,)) |
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517 elif mode == b'other': |
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518 lines = _resolve(m3, (2,)) |
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519 else: |
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520 if mode == b'mergediff': |
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521 labels = _format_labels(local, other, base) |
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522 lines, conflicts = render_mergediff(m3, *labels) |
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523 elif mode == b'merge3': |
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524 labels = _format_labels(local, other, base) |
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525 lines, conflicts = render_merge3(m3, *labels) |
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526 else: |
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527 labels = _format_labels(local, other) |
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528 lines, conflicts = render_minimized(m3, *labels) |
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529 |
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530 mergedtext = b''.join(lines) |
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531 if opts.get('print'): |
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532 ui.fout.write(mergedtext) |
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533 else: |
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534 # local.fctx.flags() already has the merged flags (done in |
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535 # mergestate.resolve()) |
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|
536 local.fctx.write(mergedtext, local.fctx.flags()) |
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|
537 |
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538 return conflicts |