Mercurial > hg
annotate tests/drawdag.py @ 48677:8e5effbf52d0 stable
branchmap: stop writing cache for uncommitted data
If we are about to write the branch while a transaction is active. we delay
that write. After the transaction is closed, we flush all the write we delayed
(unless they have been written in between).
Differential Revision: https://phab.mercurial-scm.org/D12128
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 01 Feb 2022 15:19:50 +0100 |
parents | d55b71393907 |
children | 6000f5b25c9b |
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1 # drawdag.py - convert ASCII revision DAG to actual changesets |
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2 # |
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3 # Copyright 2016 Facebook, Inc. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 """ |
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8 create changesets from an ASCII graph for testing purpose. |
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9 |
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10 For example, given the following input:: |
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11 |
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12 c d |
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13 |/ |
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14 b |
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15 | |
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16 a |
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17 |
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18 4 changesets and 4 local tags will be created. |
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19 `hg log -G -T "{rev} {desc} (tag: {tags})"` will output:: |
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20 |
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21 o 3 d (tag: d tip) |
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22 | |
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23 | o 2 c (tag: c) |
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24 |/ |
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25 o 1 b (tag: b) |
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26 | |
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27 o 0 a (tag: a) |
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28 |
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29 For root nodes (nodes without parents) in the graph, they can be revsets |
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30 pointing to existing nodes. The ASCII graph could also have disconnected |
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31 components with same names referring to the same changeset. |
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32 |
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33 Therefore, given the repo having the 4 changesets (and tags) above, with the |
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34 following ASCII graph as input:: |
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35 |
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36 foo bar bar foo |
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37 | / | | |
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38 ancestor(c,d) a baz |
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39 |
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40 The result (`hg log -G -T "{desc}"`) will look like:: |
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41 |
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42 o foo |
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43 |\ |
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44 +---o bar |
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45 | | | |
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46 | o | baz |
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47 | / |
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48 +---o d |
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49 | | |
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50 +---o c |
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51 | | |
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52 o | b |
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53 |/ |
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54 o a |
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55 |
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56 Note that if you take the above `hg log` output directly as input. It will work |
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57 as expected - the result would be an isomorphic graph:: |
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58 |
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59 o foo |
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60 |\ |
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61 | | o d |
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62 | |/ |
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63 | | o c |
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64 | |/ |
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65 | | o bar |
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66 | |/| |
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67 | o | b |
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68 | |/ |
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69 o / baz |
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70 / |
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71 o a |
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72 |
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73 This is because 'o' is specially handled in the input: instead of using 'o' as |
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74 the node name, the word to the right will be used. |
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75 |
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76 Some special comments could have side effects: |
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77 |
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78 - Create obsmarkers |
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79 # replace: A -> B -> C -> D # chained 1 to 1 replacements |
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80 # split: A -> B, C # 1 to many |
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81 # prune: A, B, C # many to nothing |
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82 """ |
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83 from __future__ import absolute_import, print_function |
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84 |
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85 import collections |
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86 import itertools |
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87 import re |
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88 |
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89 from mercurial.i18n import _ |
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90 from mercurial import ( |
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91 context, |
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92 error, |
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93 obsolete, |
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94 pycompat, |
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95 registrar, |
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96 scmutil, |
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97 tags as tagsmod, |
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98 ) |
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99 |
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100 cmdtable = {} |
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101 command = registrar.command(cmdtable) |
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102 |
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103 _pipechars = b'\\/+-|' |
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104 _nonpipechars = b''.join( |
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105 pycompat.bytechr(i) |
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106 for i in range(33, 127) |
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107 if pycompat.bytechr(i) not in _pipechars |
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108 ) |
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109 |
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110 |
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111 def _isname(ch): |
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112 """char -> bool. return True if ch looks like part of a name, False |
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113 otherwise""" |
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114 return ch in _nonpipechars |
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115 |
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116 |
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117 def _parseasciigraph(text): |
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118 r"""str -> {str : [str]}. convert the ASCII graph to edges |
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119 |
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120 >>> import pprint |
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121 >>> pprint.pprint({pycompat.sysstr(k): [pycompat.sysstr(vv) for vv in v] |
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122 ... for k, v in _parseasciigraph(br''' |
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123 ... G |
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124 ... | |
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125 ... I D C F # split: B -> E, F, G |
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126 ... \ \| | # replace: C -> D -> H |
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127 ... H B E # prune: F, I |
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128 ... \|/ |
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129 ... A |
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130 ... ''').items()}) |
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131 {'A': [], |
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132 'B': ['A'], |
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133 'C': ['B'], |
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134 'D': ['B'], |
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135 'E': ['A'], |
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136 'F': ['E'], |
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137 'G': ['F'], |
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138 'H': ['A'], |
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139 'I': ['H']} |
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140 >>> pprint.pprint({pycompat.sysstr(k): [pycompat.sysstr(vv) for vv in v] |
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141 ... for k, v in _parseasciigraph(br''' |
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142 ... o foo |
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143 ... |\ |
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144 ... +---o bar |
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145 ... | | | |
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146 ... | o | baz |
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147 ... | / |
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148 ... +---o d |
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149 ... | | |
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150 ... +---o c |
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151 ... | | |
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152 ... o | b |
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153 ... |/ |
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154 ... o a |
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155 ... ''').items()}) |
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156 {'a': [], |
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157 'b': ['a'], |
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158 'bar': ['b', 'a'], |
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159 'baz': [], |
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160 'c': ['b'], |
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161 'd': ['b'], |
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162 'foo': ['baz', 'b']} |
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163 """ |
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164 lines = text.splitlines() |
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165 edges = collections.defaultdict(list) # {node: []} |
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166 |
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167 def get(y, x): |
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168 """(int, int) -> char. give a coordinate, return the char. return a |
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169 space for anything out of range""" |
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170 if x < 0 or y < 0: |
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171 return b' ' |
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172 try: |
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173 return lines[y][x : x + 1] or b' ' |
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174 except IndexError: |
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175 return b' ' |
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176 |
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177 def getname(y, x): |
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178 """(int, int) -> str. like get(y, x) but concatenate left and right |
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179 parts. if name is an 'o', try to replace it to the right""" |
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180 result = b'' |
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181 for i in itertools.count(0): |
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182 ch = get(y, x - i) |
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183 if not _isname(ch): |
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184 break |
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185 result = ch + result |
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186 for i in itertools.count(1): |
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187 ch = get(y, x + i) |
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188 if not _isname(ch): |
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189 break |
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190 result += ch |
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191 if result == b'o': |
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192 # special handling, find the name to the right |
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193 result = b'' |
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194 for i in itertools.count(2): |
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195 ch = get(y, x + i) |
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196 if ch == b' ' or ch in _pipechars: |
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197 if result or x + i >= len(lines[y]): |
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198 break |
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199 else: |
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200 result += ch |
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201 return result or b'o' |
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202 return result |
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203 |
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204 def parents(y, x): |
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205 """(int, int) -> [str]. follow the ASCII edges at given position, |
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206 return a list of parents""" |
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207 visited = {(y, x)} |
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208 visit = [] |
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209 result = [] |
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210 |
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211 def follow(y, x, expected): |
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212 """conditionally append (y, x) to visit array, if it's a char |
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213 in excepted. 'o' in expected means an '_isname' test. |
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214 if '-' (or '+') is not in excepted, and get(y, x) is '-' (or '+'), |
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215 the next line (y + 1, x) will be checked instead.""" |
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216 ch = get(y, x) |
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217 if any(ch == c and c not in expected for c in (b'-', b'+')): |
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218 y += 1 |
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219 return follow(y + 1, x, expected) |
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220 if ch in expected or (b'o' in expected and _isname(ch)): |
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221 visit.append((y, x)) |
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222 |
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223 # -o- # starting point: |
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224 # /|\ # follow '-' (horizontally), and '/|\' (to the bottom) |
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225 follow(y + 1, x, b'|') |
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226 follow(y + 1, x - 1, b'/') |
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227 follow(y + 1, x + 1, b'\\') |
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228 follow(y, x - 1, b'-') |
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229 follow(y, x + 1, b'-') |
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230 |
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231 while visit: |
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232 y, x = visit.pop() |
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233 if (y, x) in visited: |
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234 continue |
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235 visited.add((y, x)) |
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236 ch = get(y, x) |
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237 if _isname(ch): |
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238 result.append(getname(y, x)) |
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239 continue |
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240 elif ch == b'|': |
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241 follow(y + 1, x, b'/|o') |
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242 follow(y + 1, x - 1, b'/') |
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243 follow(y + 1, x + 1, b'\\') |
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244 elif ch == b'+': |
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245 follow(y, x - 1, b'-') |
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246 follow(y, x + 1, b'-') |
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247 follow(y + 1, x - 1, b'/') |
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248 follow(y + 1, x + 1, b'\\') |
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249 follow(y + 1, x, b'|') |
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250 elif ch == b'\\': |
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251 follow(y + 1, x + 1, b'\\|o') |
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252 elif ch == b'/': |
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253 follow(y + 1, x - 1, b'/|o') |
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254 elif ch == b'-': |
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255 follow(y, x - 1, b'-+o') |
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256 follow(y, x + 1, b'-+o') |
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257 return result |
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258 |
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259 for y, line in enumerate(lines): |
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260 for x, ch in enumerate(pycompat.bytestr(line)): |
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261 if ch == b'#': # comment |
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262 break |
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263 if _isname(ch): |
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264 edges[getname(y, x)] += parents(y, x) |
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265 |
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266 return dict(edges) |
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267 |
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268 |
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269 class simplefilectx(object): |
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270 def __init__(self, path, data): |
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271 self._data = data |
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272 self._path = path |
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273 |
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274 def data(self): |
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275 return self._data |
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276 |
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277 def filenode(self): |
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278 return None |
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279 |
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280 def path(self): |
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281 return self._path |
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282 |
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283 def copysource(self): |
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284 return None |
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285 |
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286 def flags(self): |
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287 return b'' |
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288 |
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289 |
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290 class simplecommitctx(context.committablectx): |
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291 def __init__(self, repo, name, parentctxs, added): |
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292 opts = { |
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293 'changes': scmutil.status([], list(added), [], [], [], [], []), |
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294 'date': b'0 0', |
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295 'extra': {b'branch': b'default'}, |
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296 } |
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297 super(simplecommitctx, self).__init__(repo, name, **opts) |
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298 self._added = added |
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299 self._parents = parentctxs |
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300 while len(self._parents) < 2: |
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301 self._parents.append(repo[repo.nullid]) |
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302 |
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303 def filectx(self, key): |
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304 return simplefilectx(key, self._added[key]) |
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305 |
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306 def commit(self): |
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307 return self._repo.commitctx(self) |
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308 |
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309 def p1copies(self): |
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310 return {} |
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311 |
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312 def p2copies(self): |
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313 return {} |
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314 |
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315 |
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316 def _walkgraph(edges): |
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317 """yield node, parents in topologically order""" |
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318 visible = set(edges.keys()) |
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319 remaining = {} # {str: [str]} |
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320 for k, vs in edges.items(): |
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321 for v in vs: |
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322 if v not in remaining: |
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323 remaining[v] = [] |
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324 remaining[k] = vs[:] |
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325 while remaining: |
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326 leafs = [k for k, v in remaining.items() if not v] |
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327 if not leafs: |
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328 raise error.Abort(_('the graph has cycles')) |
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329 for leaf in sorted(leafs): |
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330 if leaf in visible: |
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331 yield leaf, edges[leaf] |
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332 del remaining[leaf] |
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333 for k, v in remaining.items(): |
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334 if leaf in v: |
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335 v.remove(leaf) |
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336 |
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337 |
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338 def _getcomments(text): |
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339 r""" |
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340 >>> [pycompat.sysstr(s) for s in _getcomments(br''' |
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341 ... G |
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342 ... | |
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343 ... I D C F # split: B -> E, F, G |
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344 ... \ \| | # replace: C -> D -> H |
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345 ... H B E # prune: F, I |
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346 ... \|/ |
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347 ... A |
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348 ... ''')] |
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349 ['split: B -> E, F, G', 'replace: C -> D -> H', 'prune: F, I'] |
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350 """ |
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351 for line in text.splitlines(): |
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352 if b' # ' not in line: |
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353 continue |
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354 yield line.split(b' # ', 1)[1].split(b' # ')[0].strip() |
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355 |
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356 |
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357 @command(b'debugdrawdag', []) |
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358 def debugdrawdag(ui, repo, **opts): |
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359 r"""read an ASCII graph from stdin and create changesets |
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360 |
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361 The ASCII graph is like what :hg:`log -G` outputs, with each `o` replaced |
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362 to the name of the node. The command will create dummy changesets and local |
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363 tags with those names to make the dummy changesets easier to be referred |
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364 to. |
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365 |
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366 If the name of a node is a single character 'o', It will be replaced by the |
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367 word to the right. This makes it easier to reuse |
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368 :hg:`log -G -T '{desc}'` outputs. |
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369 |
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370 For root (no parents) nodes, revset can be used to query existing repo. |
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371 Note that the revset cannot have confusing characters which can be seen as |
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372 the part of the graph edges, like `|/+-\`. |
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373 """ |
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374 text = ui.fin.read() |
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375 |
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376 # parse the graph and make sure len(parents) <= 2 for each node |
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377 edges = _parseasciigraph(text) |
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378 for k, v in edges.items(): |
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379 if len(v) > 2: |
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380 raise error.Abort(_('%s: too many parents: %s') % (k, b' '.join(v))) |
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381 |
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382 # parse comments to get extra file content instructions |
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383 files = collections.defaultdict(dict) # {(name, path): content} |
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384 comments = list(_getcomments(text)) |
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385 filere = re.compile(br'^(\w+)/([\w/]+)\s*=\s*(.*)$', re.M) |
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386 for name, path, content in filere.findall(b'\n'.join(comments)): |
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387 content = content.replace(br'\n', b'\n').replace(br'\1', b'\1') |
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388 files[name][path] = content |
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389 |
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390 committed = {None: repo.nullid} # {name: node} |
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391 |
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392 # for leaf nodes, try to find existing nodes in repo |
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393 for name, parents in edges.items(): |
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394 if len(parents) == 0: |
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395 try: |
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396 committed[name] = scmutil.revsingle(repo, name) |
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397 except error.RepoLookupError: |
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398 pass |
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399 |
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400 # commit in topological order |
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401 for name, parents in _walkgraph(edges): |
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402 if name in committed: |
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403 continue |
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404 pctxs = [repo[committed[n]] for n in parents] |
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405 pctxs.sort(key=lambda c: c.node()) |
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406 added = {} |
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407 if len(parents) > 1: |
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408 # If it's a merge, take the files and contents from the parents |
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409 for f in pctxs[1].manifest(): |
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410 if f not in pctxs[0].manifest(): |
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411 added[f] = pctxs[1][f].data() |
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412 else: |
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413 # If it's not a merge, add a single file |
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414 added[name] = name |
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415 # add extra file contents in comments |
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416 for path, content in files.get(name, {}).items(): |
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417 added[path] = content |
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418 ctx = simplecommitctx(repo, name, pctxs, added) |
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419 n = ctx.commit() |
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420 committed[name] = n |
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421 tagsmod.tag( |
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422 repo, [name], n, message=None, user=None, date=None, local=True |
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423 ) |
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424 |
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425 # handle special comments |
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426 with repo.wlock(), repo.lock(), repo.transaction(b'drawdag'): |
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427 getctx = lambda x: repo.unfiltered()[committed[x.strip()]] |
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428 for comment in comments: |
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429 rels = [] # obsolete relationships |
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430 args = comment.split(b':', 1) |
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431 if len(args) <= 1: |
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432 continue |
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433 |
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434 cmd = args[0].strip() |
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435 arg = args[1].strip() |
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436 |
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437 if cmd in (b'replace', b'rebase', b'amend'): |
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438 nodes = [getctx(m) for m in arg.split(b'->')] |
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439 for i in range(len(nodes) - 1): |
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440 rels.append(((nodes[i],), (nodes[i + 1],))) |
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441 elif cmd in (b'split',): |
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442 pre, succs = arg.split(b'->') |
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443 succs = succs.split(b',') |
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444 rels.append(((getctx(pre),), (getctx(s) for s in succs))) |
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445 elif cmd in (b'prune',): |
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446 for n in arg.split(b','): |
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447 rels.append(((getctx(n),), ())) |
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448 if rels: |
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449 obsolete.createmarkers(repo, rels, date=(0, 0), operation=cmd) |