Mercurial > hg
annotate mercurial/simplemerge.py @ 26402:05871262acd5
treemanifest: rework lazy-copying code (issue4840)
The old lazy-copy code formed a chain of copied manifests with each
copy. Under typical operation, the stack never got more than a couple
of manifests deep and was fine. Under conditions like hgsubversion or
convert, the stack could get hundreds of manifests deep, and
eventually overflow the recursion limit for Python. I was able to
consistently reproduce this by converting an hgsubversion clone of
svn's history to treemanifests.
This may result in fewer manifests staying in memory during operations
like convert when treemanifests are in use, and should make those
operations faster since there will be significantly fewer noop
function calls going on.
A previous attempt (never mailed) of mine to fix this problem tried to
simply have all treemanifests only have a loadfunc - that caused
somewhat weird problems because the gettext() callable passed into
read() wasn't idempotent, so the easy solution is to have a loadfunc
and a copyfunc.
author | Augie Fackler <augie@google.com> |
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date | Fri, 25 Sep 2015 22:54:46 -0400 |
parents | ed12abab068e |
children | 56b2bcea2529 |
rev | line source |
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1 # Copyright (C) 2004, 2005 Canonical Ltd |
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2 # |
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3 # This program is free software; you can redistribute it and/or modify |
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4 # it under the terms of the GNU General Public License as published by |
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5 # the Free Software Foundation; either version 2 of the License, or |
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6 # (at your option) any later version. |
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7 # |
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8 # This program is distributed in the hope that it will be useful, |
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9 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 # GNU General Public License for more details. |
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12 # |
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13 # You should have received a copy of the GNU General Public License |
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14 # along with this program; if not, see <http://www.gnu.org/licenses/>. |
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15 |
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16 # mbp: "you know that thing where cvs gives you conflict markers?" |
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17 # s: "i hate that." |
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18 |
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19 from __future__ import absolute_import |
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20 |
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21 import os |
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22 import sys |
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23 |
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24 from .i18n import _ |
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25 from . import ( |
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26 mdiff, |
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27 scmutil, |
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28 util, |
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29 ) |
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30 |
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31 class CantReprocessAndShowBase(Exception): |
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32 pass |
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33 |
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34 def intersect(ra, rb): |
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35 """Given two ranges return the range where they intersect or None. |
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36 |
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37 >>> intersect((0, 10), (0, 6)) |
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38 (0, 6) |
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39 >>> intersect((0, 10), (5, 15)) |
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40 (5, 10) |
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41 >>> intersect((0, 10), (10, 15)) |
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42 >>> intersect((0, 9), (10, 15)) |
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43 >>> intersect((0, 9), (7, 15)) |
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44 (7, 9) |
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45 """ |
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46 assert ra[0] <= ra[1] |
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47 assert rb[0] <= rb[1] |
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48 |
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49 sa = max(ra[0], rb[0]) |
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50 sb = min(ra[1], rb[1]) |
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51 if sa < sb: |
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52 return sa, sb |
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53 else: |
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54 return None |
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55 |
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56 def compare_range(a, astart, aend, b, bstart, bend): |
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57 """Compare a[astart:aend] == b[bstart:bend], without slicing. |
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58 """ |
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59 if (aend - astart) != (bend - bstart): |
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60 return False |
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61 for ia, ib in zip(xrange(astart, aend), xrange(bstart, bend)): |
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62 if a[ia] != b[ib]: |
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63 return False |
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64 else: |
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65 return True |
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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 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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73 self.basetext = basetext |
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74 self.atext = atext |
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75 self.btext = btext |
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76 if base is None: |
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77 base = mdiff.splitnewlines(basetext) |
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78 if a is None: |
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79 a = mdiff.splitnewlines(atext) |
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80 if b is None: |
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81 b = mdiff.splitnewlines(btext) |
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82 self.base = base |
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83 self.a = a |
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84 self.b = b |
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85 |
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86 def merge_lines(self, |
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87 name_a=None, |
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88 name_b=None, |
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89 name_base=None, |
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90 start_marker='<<<<<<<', |
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91 mid_marker='=======', |
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92 end_marker='>>>>>>>', |
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93 base_marker=None, |
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94 localorother=None): |
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95 """Return merge in cvs-like form. |
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96 """ |
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97 self.conflicts = False |
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98 newline = '\n' |
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99 if len(self.a) > 0: |
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100 if self.a[0].endswith('\r\n'): |
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101 newline = '\r\n' |
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102 elif self.a[0].endswith('\r'): |
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103 newline = '\r' |
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104 if name_a and start_marker: |
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105 start_marker = start_marker + ' ' + name_a |
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106 if name_b and end_marker: |
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107 end_marker = end_marker + ' ' + name_b |
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108 if name_base and base_marker: |
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109 base_marker = base_marker + ' ' + name_base |
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110 merge_regions = self.merge_regions() |
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111 for t in merge_regions: |
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112 what = t[0] |
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113 if what == 'unchanged': |
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114 for i in range(t[1], t[2]): |
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115 yield self.base[i] |
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116 elif what == 'a' or what == 'same': |
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117 for i in range(t[1], t[2]): |
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118 yield self.a[i] |
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119 elif what == 'b': |
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120 for i in range(t[1], t[2]): |
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121 yield self.b[i] |
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122 elif what == 'conflict': |
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123 if localorother == 'local': |
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124 for i in range(t[3], t[4]): |
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125 yield self.a[i] |
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126 elif localorother == 'other': |
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127 for i in range(t[5], t[6]): |
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128 yield self.b[i] |
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129 else: |
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130 self.conflicts = True |
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131 if start_marker is not None: |
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132 yield start_marker + newline |
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133 for i in range(t[3], t[4]): |
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134 yield self.a[i] |
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135 if base_marker is not None: |
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136 yield base_marker + newline |
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137 for i in range(t[1], t[2]): |
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138 yield self.base[i] |
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139 if mid_marker is not None: |
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140 yield mid_marker + newline |
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141 for i in range(t[5], t[6]): |
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142 yield self.b[i] |
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143 if end_marker is not None: |
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144 yield end_marker + newline |
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145 else: |
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146 raise ValueError(what) |
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147 |
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148 def merge_groups(self): |
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149 """Yield sequence of line groups. Each one is a tuple: |
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150 |
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151 'unchanged', lines |
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152 Lines unchanged from base |
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153 |
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154 'a', lines |
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155 Lines taken from a |
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156 |
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157 'same', lines |
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158 Lines taken from a (and equal to b) |
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159 |
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160 'b', lines |
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161 Lines taken from b |
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162 |
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163 'conflict', base_lines, a_lines, b_lines |
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164 Lines from base were changed to either a or b and conflict. |
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165 """ |
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166 for t in self.merge_regions(): |
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167 what = t[0] |
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168 if what == 'unchanged': |
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169 yield what, self.base[t[1]:t[2]] |
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170 elif what == 'a' or what == 'same': |
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171 yield what, self.a[t[1]:t[2]] |
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172 elif what == 'b': |
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173 yield what, self.b[t[1]:t[2]] |
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174 elif what == 'conflict': |
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175 yield (what, |
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176 self.base[t[1]:t[2]], |
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177 self.a[t[3]:t[4]], |
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178 self.b[t[5]:t[6]]) |
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179 else: |
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180 raise ValueError(what) |
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181 |
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182 def merge_regions(self): |
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183 """Return sequences of matching and conflicting regions. |
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184 |
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185 This returns tuples, where the first value says what kind we |
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186 have: |
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187 |
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188 'unchanged', start, end |
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189 Take a region of base[start:end] |
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190 |
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191 'same', astart, aend |
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192 b and a are different from base but give the same result |
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193 |
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194 'a', start, end |
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195 Non-clashing insertion from a[start:end] |
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196 |
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197 Method is as follows: |
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198 |
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199 The two sequences align only on regions which match the base |
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200 and both descendants. These are found by doing a two-way diff |
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201 of each one against the base, and then finding the |
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202 intersections between those regions. These "sync regions" |
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203 are by definition unchanged in both and easily dealt with. |
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204 |
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205 The regions in between can be in any of three cases: |
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206 conflicted, or changed on only one side. |
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207 """ |
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208 |
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209 # section a[0:ia] has been disposed of, etc |
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210 iz = ia = ib = 0 |
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211 |
16683 | 212 for region in self.find_sync_regions(): |
213 zmatch, zend, amatch, aend, bmatch, bend = region | |
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214 #print 'match base [%d:%d]' % (zmatch, zend) |
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215 |
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216 matchlen = zend - zmatch |
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217 assert matchlen >= 0 |
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218 assert matchlen == (aend - amatch) |
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219 assert matchlen == (bend - bmatch) |
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220 |
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221 len_a = amatch - ia |
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222 len_b = bmatch - ib |
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223 len_base = zmatch - iz |
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224 assert len_a >= 0 |
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225 assert len_b >= 0 |
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226 assert len_base >= 0 |
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227 |
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228 #print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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229 |
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230 if len_a or len_b: |
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231 # try to avoid actually slicing the lists |
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232 equal_a = compare_range(self.a, ia, amatch, |
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233 self.base, iz, zmatch) |
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234 equal_b = compare_range(self.b, ib, bmatch, |
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235 self.base, iz, zmatch) |
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236 same = compare_range(self.a, ia, amatch, |
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237 self.b, ib, bmatch) |
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238 |
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239 if same: |
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240 yield 'same', ia, amatch |
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241 elif equal_a and not equal_b: |
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242 yield 'b', ib, bmatch |
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243 elif equal_b and not equal_a: |
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244 yield 'a', ia, amatch |
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245 elif not equal_a and not equal_b: |
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246 yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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247 else: |
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248 raise AssertionError("can't handle a=b=base but unmatched") |
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249 |
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250 ia = amatch |
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251 ib = bmatch |
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252 iz = zmatch |
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253 |
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254 # if the same part of the base was deleted on both sides |
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255 # that's OK, we can just skip it. |
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256 |
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257 |
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258 if matchlen > 0: |
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259 assert ia == amatch |
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260 assert ib == bmatch |
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261 assert iz == zmatch |
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262 |
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263 yield 'unchanged', zmatch, zend |
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264 iz = zend |
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265 ia = aend |
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266 ib = bend |
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267 |
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268 def find_sync_regions(self): |
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269 """Return a list of sync regions, where both descendants match the base. |
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270 |
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271 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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272 always a zero-length sync region at the end of all the files. |
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273 """ |
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274 |
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275 ia = ib = 0 |
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276 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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277 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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278 len_a = len(amatches) |
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279 len_b = len(bmatches) |
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280 |
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281 sl = [] |
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282 |
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283 while ia < len_a and ib < len_b: |
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284 abase, amatch, alen = amatches[ia] |
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285 bbase, bmatch, blen = bmatches[ib] |
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286 |
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287 # there is an unconflicted block at i; how long does it |
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288 # extend? until whichever one ends earlier. |
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289 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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290 if i: |
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291 intbase = i[0] |
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292 intend = i[1] |
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293 intlen = intend - intbase |
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294 |
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295 # found a match of base[i[0], i[1]]; this may be less than |
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296 # the region that matches in either one |
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297 assert intlen <= alen |
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298 assert intlen <= blen |
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299 assert abase <= intbase |
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300 assert bbase <= intbase |
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301 |
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302 asub = amatch + (intbase - abase) |
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303 bsub = bmatch + (intbase - bbase) |
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304 aend = asub + intlen |
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305 bend = bsub + intlen |
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306 |
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307 assert self.base[intbase:intend] == self.a[asub:aend], \ |
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308 (self.base[intbase:intend], self.a[asub:aend]) |
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309 |
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310 assert self.base[intbase:intend] == self.b[bsub:bend] |
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311 |
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312 sl.append((intbase, intend, |
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313 asub, aend, |
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314 bsub, bend)) |
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315 |
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316 # advance whichever one ends first in the base text |
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317 if (abase + alen) < (bbase + blen): |
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318 ia += 1 |
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319 else: |
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320 ib += 1 |
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321 |
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322 intbase = len(self.base) |
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323 abase = len(self.a) |
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324 bbase = len(self.b) |
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325 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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326 |
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327 return sl |
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328 |
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329 def find_unconflicted(self): |
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330 """Return a list of ranges in base that are not conflicted.""" |
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331 am = mdiff.get_matching_blocks(self.basetext, self.atext) |
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332 bm = mdiff.get_matching_blocks(self.basetext, self.btext) |
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333 |
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334 unc = [] |
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335 |
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336 while am and bm: |
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337 # there is an unconflicted block at i; how long does it |
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338 # extend? until whichever one ends earlier. |
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339 a1 = am[0][0] |
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340 a2 = a1 + am[0][2] |
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341 b1 = bm[0][0] |
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342 b2 = b1 + bm[0][2] |
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343 i = intersect((a1, a2), (b1, b2)) |
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344 if i: |
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345 unc.append(i) |
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346 |
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347 if a2 < b2: |
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348 del am[0] |
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349 else: |
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350 del bm[0] |
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351 |
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352 return unc |
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353 |
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354 def simplemerge(ui, local, base, other, **opts): |
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355 def readfile(filename): |
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356 f = open(filename, "rb") |
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357 text = f.read() |
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358 f.close() |
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359 if util.binary(text): |
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360 msg = _("%s looks like a binary file.") % filename |
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361 if not opts.get('quiet'): |
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362 ui.warn(_('warning: %s\n') % msg) |
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363 if not opts.get('text'): |
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364 raise util.Abort(msg) |
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365 return text |
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366 |
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367 mode = opts.get('mode','merge') |
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368 if mode == 'union': |
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369 name_a = None |
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370 name_b = None |
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371 name_base = None |
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372 else: |
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373 name_a = local |
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374 name_b = other |
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375 name_base = None |
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376 labels = opts.get('label', []) |
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377 if len(labels) > 0: |
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378 name_a = labels[0] |
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379 if len(labels) > 1: |
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380 name_b = labels[1] |
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381 if len(labels) > 2: |
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382 name_base = labels[2] |
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383 if len(labels) > 3: |
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384 raise util.Abort(_("can only specify three labels.")) |
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385 |
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386 try: |
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387 localtext = readfile(local) |
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388 basetext = readfile(base) |
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389 othertext = readfile(other) |
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390 except util.Abort: |
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391 return 1 |
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392 |
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393 local = os.path.realpath(local) |
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394 if not opts.get('print'): |
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395 opener = scmutil.opener(os.path.dirname(local)) |
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396 out = opener(os.path.basename(local), "w", atomictemp=True) |
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397 else: |
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398 out = sys.stdout |
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399 |
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400 m3 = Merge3Text(basetext, localtext, othertext) |
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401 extrakwargs = {"localorother": opts.get("localorother", None)} |
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402 if mode == 'union': |
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403 extrakwargs['start_marker'] = None |
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404 extrakwargs['mid_marker'] = None |
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405 extrakwargs['end_marker'] = None |
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406 elif name_base is not None: |
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407 extrakwargs['base_marker'] = '|||||||' |
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408 extrakwargs['name_base'] = name_base |
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409 for line in m3.merge_lines(name_a=name_a, name_b=name_b, **extrakwargs): |
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410 out.write(line) |
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411 |
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412 if not opts.get('print'): |
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413 out.close() |
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414 |
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415 if m3.conflicts and not mode == 'union': |
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416 if not opts.get('quiet'): |
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417 ui.warn(_("warning: conflicts during merge.\n")) |
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418 return 1 |