Mercurial > hg
annotate mercurial/simplemerge.py @ 6858:8f256bf98219
Add support for multiple possible bisect results (issue1228, issue1182)
The real reason for both issue is that bisect can not handle cases where there
are multiple possibilities for the result.
Example (from issue1228):
rev 0 -> good
rev 1 -> skipped
rev 2 -> skipped
rev 3 -> skipped
rev 4 -> bad
Note that this patch does not only fix the reported Assertion Error but also
the problem of a non converging bisect:
hg init
for i in `seq 3`; do echo $i > $i; hg add $i; hg ci -m$i; done
hg bisect -b 2
hg bisect -g 0
hg bisect -s
From this state on, you can:
a) mark as bad forever (non converging!)
b) mark as good to get an inconsistent state
c) skip for the Assertion Error
Minor description and code edits by pmezard.
author | Bernhard Leiner <bleiner@gmail.com> |
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date | Sat, 02 Aug 2008 22:10:10 +0200 |
parents | e75aab656f46 |
children | 810ca383da9c |
rev | line source |
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1 #!/usr/bin/env python |
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2 # Copyright (C) 2004, 2005 Canonical Ltd |
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3 # |
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4 # This program is free software; you can redistribute it and/or modify |
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5 # it under the terms of the GNU General Public License as published by |
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6 # the Free Software Foundation; either version 2 of the License, or |
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7 # (at your option) any later version. |
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8 # |
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9 # This program is distributed in the hope that it will be useful, |
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10 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 # GNU General Public License for more details. |
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13 # |
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14 # You should have received a copy of the GNU General Public License |
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15 # along with this program; if not, write to the Free Software |
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16 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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17 |
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18 # mbp: "you know that thing where cvs gives you conflict markers?" |
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19 # s: "i hate that." |
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20 |
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21 from i18n import _ |
6212 | 22 import util, mdiff, sys, os |
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23 |
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24 class CantReprocessAndShowBase(Exception): |
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25 pass |
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26 |
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27 def warn(message): |
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28 sys.stdout.flush() |
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29 sys.stderr.write(message) |
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30 sys.stderr.flush() |
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31 |
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32 def intersect(ra, rb): |
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33 """Given two ranges return the range where they intersect or None. |
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34 |
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35 >>> intersect((0, 10), (0, 6)) |
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36 (0, 6) |
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37 >>> intersect((0, 10), (5, 15)) |
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38 (5, 10) |
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39 >>> intersect((0, 10), (10, 15)) |
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40 >>> intersect((0, 9), (10, 15)) |
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41 >>> intersect((0, 9), (7, 15)) |
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42 (7, 9) |
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43 """ |
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44 assert ra[0] <= ra[1] |
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45 assert rb[0] <= rb[1] |
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46 |
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47 sa = max(ra[0], rb[0]) |
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48 sb = min(ra[1], rb[1]) |
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49 if sa < sb: |
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50 return sa, sb |
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51 else: |
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52 return None |
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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 """ |
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57 if (aend-astart) != (bend-bstart): |
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58 return False |
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59 for ia, ib in zip(xrange(astart, aend), xrange(bstart, bend)): |
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60 if a[ia] != b[ib]: |
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61 return False |
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62 else: |
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63 return True |
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64 |
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65 class Merge3Text(object): |
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66 """3-way merge of texts. |
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67 |
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68 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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69 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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70 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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71 self.basetext = basetext |
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72 self.atext = atext |
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73 self.btext = btext |
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74 if base is None: |
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75 base = mdiff.splitnewlines(basetext) |
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76 if a is None: |
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77 a = mdiff.splitnewlines(atext) |
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78 if b is None: |
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79 b = mdiff.splitnewlines(btext) |
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80 self.base = base |
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81 self.a = a |
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82 self.b = b |
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83 |
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84 def merge_lines(self, |
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85 name_a=None, |
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86 name_b=None, |
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87 name_base=None, |
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88 start_marker='<<<<<<<', |
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89 mid_marker='=======', |
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90 end_marker='>>>>>>>', |
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91 base_marker=None, |
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92 reprocess=False): |
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93 """Return merge in cvs-like form. |
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94 """ |
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95 self.conflicts = False |
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96 newline = '\n' |
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97 if len(self.a) > 0: |
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98 if self.a[0].endswith('\r\n'): |
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99 newline = '\r\n' |
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100 elif self.a[0].endswith('\r'): |
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101 newline = '\r' |
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102 if base_marker and reprocess: |
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103 raise CantReprocessAndShowBase() |
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104 if name_a: |
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105 start_marker = start_marker + ' ' + name_a |
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106 if name_b: |
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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 if reprocess is True: |
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112 merge_regions = self.reprocess_merge_regions(merge_regions) |
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113 for t in merge_regions: |
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114 what = t[0] |
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115 if what == 'unchanged': |
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116 for i in range(t[1], t[2]): |
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117 yield self.base[i] |
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118 elif what == 'a' or what == 'same': |
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119 for i in range(t[1], t[2]): |
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120 yield self.a[i] |
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121 elif what == 'b': |
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122 for i in range(t[1], t[2]): |
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123 yield self.b[i] |
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124 elif what == 'conflict': |
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125 self.conflicts = True |
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126 yield start_marker + newline |
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127 for i in range(t[3], t[4]): |
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128 yield self.a[i] |
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129 if base_marker is not None: |
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130 yield base_marker + newline |
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131 for i in range(t[1], t[2]): |
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132 yield self.base[i] |
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133 yield mid_marker + newline |
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134 for i in range(t[5], t[6]): |
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135 yield self.b[i] |
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136 yield end_marker + newline |
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137 else: |
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138 raise ValueError(what) |
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139 |
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140 def merge_annotated(self): |
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141 """Return merge with conflicts, showing origin of lines. |
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142 |
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143 Most useful for debugging merge. |
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144 """ |
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145 for t in self.merge_regions(): |
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146 what = t[0] |
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147 if what == 'unchanged': |
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148 for i in range(t[1], t[2]): |
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149 yield 'u | ' + self.base[i] |
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150 elif what == 'a' or what == 'same': |
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151 for i in range(t[1], t[2]): |
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152 yield what[0] + ' | ' + self.a[i] |
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153 elif what == 'b': |
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154 for i in range(t[1], t[2]): |
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155 yield 'b | ' + self.b[i] |
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156 elif what == 'conflict': |
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157 yield '<<<<\n' |
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158 for i in range(t[3], t[4]): |
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159 yield 'A | ' + self.a[i] |
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160 yield '----\n' |
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161 for i in range(t[5], t[6]): |
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162 yield 'B | ' + self.b[i] |
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163 yield '>>>>\n' |
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164 else: |
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165 raise ValueError(what) |
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166 |
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167 def merge_groups(self): |
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168 """Yield sequence of line groups. Each one is a tuple: |
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169 |
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170 'unchanged', lines |
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171 Lines unchanged from base |
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172 |
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173 'a', lines |
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174 Lines taken from a |
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175 |
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176 'same', lines |
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177 Lines taken from a (and equal to b) |
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178 |
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179 'b', lines |
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180 Lines taken from b |
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181 |
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182 'conflict', base_lines, a_lines, b_lines |
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183 Lines from base were changed to either a or b and conflict. |
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184 """ |
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185 for t in self.merge_regions(): |
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186 what = t[0] |
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187 if what == 'unchanged': |
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188 yield what, self.base[t[1]:t[2]] |
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189 elif what == 'a' or what == 'same': |
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190 yield what, self.a[t[1]:t[2]] |
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191 elif what == 'b': |
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192 yield what, self.b[t[1]:t[2]] |
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193 elif what == 'conflict': |
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194 yield (what, |
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195 self.base[t[1]:t[2]], |
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196 self.a[t[3]:t[4]], |
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197 self.b[t[5]:t[6]]) |
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198 else: |
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199 raise ValueError(what) |
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200 |
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201 def merge_regions(self): |
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202 """Return sequences of matching and conflicting regions. |
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203 |
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204 This returns tuples, where the first value says what kind we |
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205 have: |
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206 |
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207 'unchanged', start, end |
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208 Take a region of base[start:end] |
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209 |
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210 'same', astart, aend |
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211 b and a are different from base but give the same result |
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212 |
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213 'a', start, end |
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214 Non-clashing insertion from a[start:end] |
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215 |
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216 Method is as follows: |
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217 |
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218 The two sequences align only on regions which match the base |
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219 and both descendents. These are found by doing a two-way diff |
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220 of each one against the base, and then finding the |
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221 intersections between those regions. These "sync regions" |
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222 are by definition unchanged in both and easily dealt with. |
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223 |
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224 The regions in between can be in any of three cases: |
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225 conflicted, or changed on only one side. |
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226 """ |
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227 |
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228 # section a[0:ia] has been disposed of, etc |
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229 iz = ia = ib = 0 |
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230 |
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231 for zmatch, zend, amatch, aend, bmatch, bend in self.find_sync_regions(): |
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232 #print 'match base [%d:%d]' % (zmatch, zend) |
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233 |
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234 matchlen = zend - zmatch |
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235 assert matchlen >= 0 |
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236 assert matchlen == (aend - amatch) |
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237 assert matchlen == (bend - bmatch) |
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238 |
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239 len_a = amatch - ia |
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240 len_b = bmatch - ib |
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241 len_base = zmatch - iz |
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242 assert len_a >= 0 |
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243 assert len_b >= 0 |
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244 assert len_base >= 0 |
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245 |
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246 #print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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247 |
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248 if len_a or len_b: |
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249 # try to avoid actually slicing the lists |
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250 equal_a = compare_range(self.a, ia, amatch, |
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251 self.base, iz, zmatch) |
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252 equal_b = compare_range(self.b, ib, bmatch, |
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253 self.base, iz, zmatch) |
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254 same = compare_range(self.a, ia, amatch, |
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255 self.b, ib, bmatch) |
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256 |
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257 if same: |
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258 yield 'same', ia, amatch |
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259 elif equal_a and not equal_b: |
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260 yield 'b', ib, bmatch |
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261 elif equal_b and not equal_a: |
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262 yield 'a', ia, amatch |
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263 elif not equal_a and not equal_b: |
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264 yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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265 else: |
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266 raise AssertionError("can't handle a=b=base but unmatched") |
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267 |
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268 ia = amatch |
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269 ib = bmatch |
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270 iz = zmatch |
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271 |
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272 # if the same part of the base was deleted on both sides |
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273 # that's OK, we can just skip it. |
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274 |
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275 |
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276 if matchlen > 0: |
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277 assert ia == amatch |
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278 assert ib == bmatch |
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279 assert iz == zmatch |
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280 |
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281 yield 'unchanged', zmatch, zend |
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282 iz = zend |
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283 ia = aend |
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284 ib = bend |
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285 |
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286 def reprocess_merge_regions(self, merge_regions): |
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287 """Where there are conflict regions, remove the agreed lines. |
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288 |
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289 Lines where both A and B have made the same changes are |
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290 eliminated. |
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291 """ |
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292 for region in merge_regions: |
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293 if region[0] != "conflict": |
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294 yield region |
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295 continue |
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296 type, iz, zmatch, ia, amatch, ib, bmatch = region |
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297 a_region = self.a[ia:amatch] |
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298 b_region = self.b[ib:bmatch] |
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299 matches = mdiff.get_matching_blocks(''.join(a_region), |
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300 ''.join(b_region)) |
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301 next_a = ia |
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302 next_b = ib |
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303 for region_ia, region_ib, region_len in matches[:-1]: |
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304 region_ia += ia |
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305 region_ib += ib |
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306 reg = self.mismatch_region(next_a, region_ia, next_b, |
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307 region_ib) |
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308 if reg is not None: |
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309 yield reg |
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310 yield 'same', region_ia, region_len+region_ia |
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311 next_a = region_ia + region_len |
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312 next_b = region_ib + region_len |
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313 reg = self.mismatch_region(next_a, amatch, next_b, bmatch) |
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314 if reg is not None: |
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315 yield reg |
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316 |
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317 def mismatch_region(next_a, region_ia, next_b, region_ib): |
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318 if next_a < region_ia or next_b < region_ib: |
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319 return 'conflict', None, None, next_a, region_ia, next_b, region_ib |
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320 mismatch_region = staticmethod(mismatch_region) |
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321 |
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322 def find_sync_regions(self): |
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323 """Return a list of sync regions, where both descendents match the base. |
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324 |
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325 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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326 always a zero-length sync region at the end of all the files. |
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327 """ |
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328 |
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329 ia = ib = 0 |
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330 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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331 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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332 len_a = len(amatches) |
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333 len_b = len(bmatches) |
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334 |
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335 sl = [] |
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336 |
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337 while ia < len_a and ib < len_b: |
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338 abase, amatch, alen = amatches[ia] |
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339 bbase, bmatch, blen = bmatches[ib] |
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340 |
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341 # there is an unconflicted block at i; how long does it |
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342 # extend? until whichever one ends earlier. |
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343 i = intersect((abase, abase+alen), (bbase, bbase+blen)) |
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344 if i: |
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345 intbase = i[0] |
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346 intend = i[1] |
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347 intlen = intend - intbase |
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348 |
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349 # found a match of base[i[0], i[1]]; this may be less than |
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350 # the region that matches in either one |
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351 assert intlen <= alen |
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352 assert intlen <= blen |
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353 assert abase <= intbase |
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354 assert bbase <= intbase |
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355 |
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356 asub = amatch + (intbase - abase) |
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357 bsub = bmatch + (intbase - bbase) |
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358 aend = asub + intlen |
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359 bend = bsub + intlen |
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360 |
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361 assert self.base[intbase:intend] == self.a[asub:aend], \ |
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362 (self.base[intbase:intend], self.a[asub:aend]) |
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363 |
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364 assert self.base[intbase:intend] == self.b[bsub:bend] |
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365 |
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366 sl.append((intbase, intend, |
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367 asub, aend, |
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368 bsub, bend)) |
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369 |
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370 # advance whichever one ends first in the base text |
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371 if (abase + alen) < (bbase + blen): |
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372 ia += 1 |
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373 else: |
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374 ib += 1 |
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375 |
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376 intbase = len(self.base) |
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377 abase = len(self.a) |
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378 bbase = len(self.b) |
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379 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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380 |
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381 return sl |
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382 |
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383 def find_unconflicted(self): |
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384 """Return a list of ranges in base that are not conflicted.""" |
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385 am = mdiff.get_matching_blocks(self.basetext, self.atext) |
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386 bm = mdiff.get_matching_blocks(self.basetext, self.btext) |
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387 |
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388 unc = [] |
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389 |
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390 while am and bm: |
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391 # there is an unconflicted block at i; how long does it |
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392 # extend? until whichever one ends earlier. |
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393 a1 = am[0][0] |
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394 a2 = a1 + am[0][2] |
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395 b1 = bm[0][0] |
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396 b2 = b1 + bm[0][2] |
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397 i = intersect((a1, a2), (b1, b2)) |
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398 if i: |
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399 unc.append(i) |
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400 |
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401 if a2 < b2: |
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402 del am[0] |
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403 else: |
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404 del bm[0] |
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405 |
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406 return unc |
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407 |
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408 def simplemerge(local, base, other, **opts): |
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409 def readfile(filename): |
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410 f = open(filename, "rb") |
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411 text = f.read() |
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412 f.close() |
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413 if util.binary(text): |
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414 msg = _("%s looks like a binary file.") % filename |
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415 if not opts.get('text'): |
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416 raise util.Abort(msg) |
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417 elif not opts.get('quiet'): |
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418 warn(_('warning: %s\n') % msg) |
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419 return text |
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420 |
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421 name_a = local |
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422 name_b = other |
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423 labels = opts.get('label', []) |
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424 if labels: |
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425 name_a = labels.pop(0) |
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426 if labels: |
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427 name_b = labels.pop(0) |
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428 if labels: |
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429 raise util.Abort(_("can only specify two labels.")) |
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430 |
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431 localtext = readfile(local) |
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432 basetext = readfile(base) |
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433 othertext = readfile(other) |
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434 |
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435 orig = local |
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436 local = os.path.realpath(local) |
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437 if not opts.get('print'): |
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438 opener = util.opener(os.path.dirname(local)) |
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439 out = opener(os.path.basename(local), "w", atomictemp=True) |
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440 else: |
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441 out = sys.stdout |
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442 |
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443 reprocess = not opts.get('no_minimal') |
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444 |
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445 m3 = Merge3Text(basetext, localtext, othertext) |
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446 for line in m3.merge_lines(name_a=name_a, name_b=name_b, |
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447 reprocess=reprocess): |
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448 out.write(line) |
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449 |
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450 if not opts.get('print'): |
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451 out.rename() |
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452 |
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453 if m3.conflicts: |
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454 if not opts.get('quiet'): |
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|
455 warn(_("warning: conflicts during merge.\n")) |
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456 return 1 |