Mercurial > hg
annotate hgext/fix.py @ 38536:5ffe2041d427
fix: use a worker pool to parallelize running tools
This is important for usability when tools are slow or numerous.
Differential Revision: https://phab.mercurial-scm.org/D3846
author | Danny Hooper <hooper@google.com> |
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date | Tue, 26 Jun 2018 15:30:49 -0700 |
parents | 32fba6fe893d |
children | a3be09e277e9 |
rev | line source |
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1 # fix - rewrite file content in changesets and working copy |
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2 # |
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3 # Copyright 2018 Google LLC. |
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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 """rewrite file content in changesets or working copy (EXPERIMENTAL) |
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8 |
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9 Provides a command that runs configured tools on the contents of modified files, |
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10 writing back any fixes to the working copy or replacing changesets. |
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11 |
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12 Here is an example configuration that causes :hg:`fix` to apply automatic |
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13 formatting fixes to modified lines in C++ code:: |
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14 |
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15 [fix] |
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16 clang-format:command=clang-format --assume-filename={rootpath} |
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17 clang-format:linerange=--lines={first}:{last} |
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18 clang-format:fileset=set:**.cpp or **.hpp |
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19 |
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20 The :command suboption forms the first part of the shell command that will be |
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21 used to fix a file. The content of the file is passed on standard input, and the |
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22 fixed file content is expected on standard output. If there is any output on |
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23 standard error, the file will not be affected. Some values may be substituted |
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24 into the command:: |
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25 |
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26 {rootpath} The path of the file being fixed, relative to the repo root |
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27 {basename} The name of the file being fixed, without the directory path |
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28 |
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29 If the :linerange suboption is set, the tool will only be run if there are |
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30 changed lines in a file. The value of this suboption is appended to the shell |
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31 command once for every range of changed lines in the file. Some values may be |
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32 substituted into the command:: |
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33 |
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34 {first} The 1-based line number of the first line in the modified range |
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35 {last} The 1-based line number of the last line in the modified range |
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36 |
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37 The :fileset suboption determines which files will be passed through each |
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38 configured tool. See :hg:`help fileset` for possible values. If there are file |
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39 arguments to :hg:`fix`, the intersection of these filesets is used. |
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40 |
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41 There is also a configurable limit for the maximum size of file that will be |
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42 processed by :hg:`fix`:: |
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43 |
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44 [fix] |
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45 maxfilesize=2MB |
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46 |
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47 """ |
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48 |
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49 from __future__ import absolute_import |
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50 |
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51 import collections |
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52 import itertools |
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53 import os |
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54 import re |
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55 import subprocess |
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56 |
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57 from mercurial.i18n import _ |
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58 from mercurial.node import nullrev |
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59 from mercurial.node import wdirrev |
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60 |
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61 from mercurial import ( |
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62 cmdutil, |
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63 context, |
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64 copies, |
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65 error, |
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66 mdiff, |
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67 merge, |
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68 obsolete, |
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69 pycompat, |
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70 registrar, |
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71 scmutil, |
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72 util, |
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73 worker, |
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74 ) |
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75 |
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76 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for |
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77 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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78 # be specifying the version(s) of Mercurial they are tested with, or |
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79 # leave the attribute unspecified. |
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80 testedwith = 'ships-with-hg-core' |
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81 |
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82 cmdtable = {} |
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83 command = registrar.command(cmdtable) |
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84 |
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85 configtable = {} |
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86 configitem = registrar.configitem(configtable) |
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87 |
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88 # Register the suboptions allowed for each configured fixer. |
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89 FIXER_ATTRS = ('command', 'linerange', 'fileset') |
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90 |
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91 for key in FIXER_ATTRS: |
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92 configitem('fix', '.*(:%s)?' % key, default=None, generic=True) |
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93 |
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94 # A good default size allows most source code files to be fixed, but avoids |
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95 # letting fixer tools choke on huge inputs, which could be surprising to the |
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96 # user. |
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97 configitem('fix', 'maxfilesize', default='2MB') |
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98 |
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99 @command('fix', |
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100 [('', 'all', False, _('fix all non-public non-obsolete revisions')), |
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101 ('', 'base', [], _('revisions to diff against (overrides automatic ' |
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102 'selection, and applies to every revision being ' |
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103 'fixed)'), _('REV')), |
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104 ('r', 'rev', [], _('revisions to fix'), _('REV')), |
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105 ('w', 'working-dir', False, _('fix the working directory')), |
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106 ('', 'whole', False, _('always fix every line of a file'))], |
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107 _('[OPTION]... [FILE]...')) |
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108 def fix(ui, repo, *pats, **opts): |
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109 """rewrite file content in changesets or working directory |
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110 |
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111 Runs any configured tools to fix the content of files. Only affects files |
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112 with changes, unless file arguments are provided. Only affects changed lines |
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113 of files, unless the --whole flag is used. Some tools may always affect the |
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114 whole file regardless of --whole. |
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115 |
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116 If revisions are specified with --rev, those revisions will be checked, and |
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117 they may be replaced with new revisions that have fixed file content. It is |
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118 desirable to specify all descendants of each specified revision, so that the |
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119 fixes propagate to the descendants. If all descendants are fixed at the same |
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120 time, no merging, rebasing, or evolution will be required. |
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121 |
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122 If --working-dir is used, files with uncommitted changes in the working copy |
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123 will be fixed. If the checked-out revision is also fixed, the working |
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124 directory will update to the replacement revision. |
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125 |
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126 When determining what lines of each file to fix at each revision, the whole |
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127 set of revisions being fixed is considered, so that fixes to earlier |
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128 revisions are not forgotten in later ones. The --base flag can be used to |
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129 override this default behavior, though it is not usually desirable to do so. |
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130 """ |
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131 opts = pycompat.byteskwargs(opts) |
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132 if opts['all']: |
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133 if opts['rev']: |
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134 raise error.Abort(_('cannot specify both "--rev" and "--all"')) |
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135 opts['rev'] = ['not public() and not obsolete()'] |
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136 opts['working_dir'] = True |
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137 with repo.wlock(), repo.lock(), repo.transaction('fix'): |
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138 revstofix = getrevstofix(ui, repo, opts) |
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139 basectxs = getbasectxs(repo, opts, revstofix) |
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140 workqueue, numitems = getworkqueue(ui, repo, pats, opts, revstofix, |
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141 basectxs) |
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142 fixers = getfixers(ui) |
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143 |
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144 # There are no data dependencies between the workers fixing each file |
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145 # revision, so we can use all available parallelism. |
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146 def getfixes(items): |
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147 for rev, path in items: |
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148 ctx = repo[rev] |
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149 olddata = ctx[path].data() |
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150 newdata = fixfile(ui, opts, fixers, ctx, path, basectxs[rev]) |
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151 # Don't waste memory/time passing unchanged content back, but |
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152 # produce one result per item either way. |
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153 yield (rev, path, newdata if newdata != olddata else None) |
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154 results = worker.worker(ui, 1.0, getfixes, tuple(), workqueue) |
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155 |
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156 # We have to hold on to the data for each successor revision in memory |
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157 # until all its parents are committed. We ensure this by committing and |
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158 # freeing memory for the revisions in some topological order. This |
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159 # leaves a little bit of memory efficiency on the table, but also makes |
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160 # the tests deterministic. It might also be considered a feature since |
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161 # it makes the results more easily reproducible. |
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162 filedata = collections.defaultdict(dict) |
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163 replacements = {} |
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164 commitorder = sorted(revstofix, reverse=True) |
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165 for rev, path, newdata in results: |
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166 if newdata is not None: |
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167 filedata[rev][path] = newdata |
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168 numitems[rev] -= 1 |
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169 # Apply the fixes for this and any other revisions that are ready |
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170 # and sitting at the front of the queue. Using a loop here prevents |
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171 # the queue from being blocked by the first revision to be ready out |
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172 # of order. |
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173 while commitorder and not numitems[commitorder[-1]]: |
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174 rev = commitorder.pop() |
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175 ctx = repo[rev] |
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176 if rev == wdirrev: |
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177 writeworkingdir(repo, ctx, filedata[rev], replacements) |
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178 else: |
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179 replacerev(ui, repo, ctx, filedata[rev], replacements) |
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180 del filedata[rev] |
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181 |
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182 replacements = {prec: [succ] for prec, succ in replacements.iteritems()} |
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183 scmutil.cleanupnodes(repo, replacements, 'fix', fixphase=True) |
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184 |
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185 def getworkqueue(ui, repo, pats, opts, revstofix, basectxs): |
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186 """"Constructs the list of files to be fixed at specific revisions |
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187 |
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188 It is up to the caller how to consume the work items, and the only |
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189 dependence between them is that replacement revisions must be committed in |
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190 topological order. Each work item represents a file in the working copy or |
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191 in some revision that should be fixed and written back to the working copy |
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192 or into a replacement revision. |
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193 |
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194 Work items for the same revision are grouped together, so that a worker |
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195 pool starting with the first N items in parallel is likely to finish the |
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196 first revision's work before other revisions. This can allow us to write |
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197 the result to disk and reduce memory footprint. At time of writing, the |
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198 partition strategy in worker.py seems favorable to this. We also sort the |
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199 items by ascending revision number to match the order in which we commit |
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200 the fixes later. |
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201 """ |
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202 workqueue = [] |
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203 numitems = collections.defaultdict(int) |
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204 maxfilesize = ui.configbytes('fix', 'maxfilesize') |
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205 for rev in sorted(revstofix): |
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206 fixctx = repo[rev] |
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207 match = scmutil.match(fixctx, pats, opts) |
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208 for path in pathstofix(ui, repo, pats, opts, match, basectxs[rev], |
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209 fixctx): |
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210 if path not in fixctx: |
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211 continue |
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212 fctx = fixctx[path] |
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213 if fctx.islink(): |
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214 continue |
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215 if fctx.size() > maxfilesize: |
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216 ui.warn(_('ignoring file larger than %s: %s\n') % |
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217 (util.bytecount(maxfilesize), path)) |
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218 continue |
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219 workqueue.append((rev, path)) |
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220 numitems[rev] += 1 |
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221 return workqueue, numitems |
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222 |
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223 def getrevstofix(ui, repo, opts): |
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224 """Returns the set of revision numbers that should be fixed""" |
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225 revs = set(scmutil.revrange(repo, opts['rev'])) |
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226 for rev in revs: |
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227 checkfixablectx(ui, repo, repo[rev]) |
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228 if revs: |
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229 cmdutil.checkunfinished(repo) |
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230 checknodescendants(repo, revs) |
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231 if opts.get('working_dir'): |
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232 revs.add(wdirrev) |
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233 if list(merge.mergestate.read(repo).unresolved()): |
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234 raise error.Abort('unresolved conflicts', hint="use 'hg resolve'") |
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235 if not revs: |
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236 raise error.Abort( |
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237 'no changesets specified', hint='use --rev or --working-dir') |
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238 return revs |
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239 |
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240 def checknodescendants(repo, revs): |
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241 if (not obsolete.isenabled(repo, obsolete.allowunstableopt) and |
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242 repo.revs('(%ld::) - (%ld)', revs, revs)): |
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243 raise error.Abort(_('can only fix a changeset together ' |
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244 'with all its descendants')) |
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245 |
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246 def checkfixablectx(ui, repo, ctx): |
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247 """Aborts if the revision shouldn't be replaced with a fixed one.""" |
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248 if not ctx.mutable(): |
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249 raise error.Abort('can\'t fix immutable changeset %s' % |
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250 (scmutil.formatchangeid(ctx),)) |
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251 if ctx.obsolete(): |
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252 # It would be better to actually check if the revision has a successor. |
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253 allowdivergence = ui.configbool('experimental', |
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254 'evolution.allowdivergence') |
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255 if not allowdivergence: |
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256 raise error.Abort('fixing obsolete revision could cause divergence') |
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257 |
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258 def pathstofix(ui, repo, pats, opts, match, basectxs, fixctx): |
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259 """Returns the set of files that should be fixed in a context |
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260 |
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261 The result depends on the base contexts; we include any file that has |
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262 changed relative to any of the base contexts. Base contexts should be |
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263 ancestors of the context being fixed. |
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264 """ |
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265 files = set() |
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266 for basectx in basectxs: |
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267 stat = repo.status( |
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268 basectx, fixctx, match=match, clean=bool(pats), unknown=bool(pats)) |
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269 files.update( |
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270 set(itertools.chain(stat.added, stat.modified, stat.clean, |
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271 stat.unknown))) |
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272 return files |
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273 |
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274 def lineranges(opts, path, basectxs, fixctx, content2): |
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275 """Returns the set of line ranges that should be fixed in a file |
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276 |
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277 Of the form [(10, 20), (30, 40)]. |
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278 |
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279 This depends on the given base contexts; we must consider lines that have |
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280 changed versus any of the base contexts, and whether the file has been |
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281 renamed versus any of them. |
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282 |
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283 Another way to understand this is that we exclude line ranges that are |
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284 common to the file in all base contexts. |
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285 """ |
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286 if opts.get('whole'): |
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287 # Return a range containing all lines. Rely on the diff implementation's |
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288 # idea of how many lines are in the file, instead of reimplementing it. |
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289 return difflineranges('', content2) |
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290 |
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291 rangeslist = [] |
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292 for basectx in basectxs: |
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293 basepath = copies.pathcopies(basectx, fixctx).get(path, path) |
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294 if basepath in basectx: |
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295 content1 = basectx[basepath].data() |
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296 else: |
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297 content1 = '' |
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298 rangeslist.extend(difflineranges(content1, content2)) |
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299 return unionranges(rangeslist) |
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300 |
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301 def unionranges(rangeslist): |
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302 """Return the union of some closed intervals |
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303 |
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304 >>> unionranges([]) |
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305 [] |
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306 >>> unionranges([(1, 100)]) |
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307 [(1, 100)] |
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308 >>> unionranges([(1, 100), (1, 100)]) |
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309 [(1, 100)] |
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310 >>> unionranges([(1, 100), (2, 100)]) |
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311 [(1, 100)] |
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312 >>> unionranges([(1, 99), (1, 100)]) |
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313 [(1, 100)] |
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314 >>> unionranges([(1, 100), (40, 60)]) |
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315 [(1, 100)] |
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316 >>> unionranges([(1, 49), (50, 100)]) |
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317 [(1, 100)] |
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318 >>> unionranges([(1, 48), (50, 100)]) |
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319 [(1, 48), (50, 100)] |
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320 >>> unionranges([(1, 2), (3, 4), (5, 6)]) |
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321 [(1, 6)] |
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322 """ |
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323 rangeslist = sorted(set(rangeslist)) |
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324 unioned = [] |
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325 if rangeslist: |
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326 unioned, rangeslist = [rangeslist[0]], rangeslist[1:] |
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327 for a, b in rangeslist: |
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328 c, d = unioned[-1] |
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329 if a > d + 1: |
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330 unioned.append((a, b)) |
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331 else: |
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332 unioned[-1] = (c, max(b, d)) |
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333 return unioned |
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334 |
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335 def difflineranges(content1, content2): |
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336 """Return list of line number ranges in content2 that differ from content1. |
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337 |
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338 Line numbers are 1-based. The numbers are the first and last line contained |
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339 in the range. Single-line ranges have the same line number for the first and |
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340 last line. Excludes any empty ranges that result from lines that are only |
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341 present in content1. Relies on mdiff's idea of where the line endings are in |
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342 the string. |
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343 |
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344 >>> from mercurial import pycompat |
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345 >>> lines = lambda s: b'\\n'.join([c for c in pycompat.iterbytestr(s)]) |
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346 >>> difflineranges2 = lambda a, b: difflineranges(lines(a), lines(b)) |
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347 >>> difflineranges2(b'', b'') |
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348 [] |
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349 >>> difflineranges2(b'a', b'') |
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350 [] |
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351 >>> difflineranges2(b'', b'A') |
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352 [(1, 1)] |
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353 >>> difflineranges2(b'a', b'a') |
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354 [] |
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355 >>> difflineranges2(b'a', b'A') |
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356 [(1, 1)] |
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357 >>> difflineranges2(b'ab', b'') |
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358 [] |
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359 >>> difflineranges2(b'', b'AB') |
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360 [(1, 2)] |
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361 >>> difflineranges2(b'abc', b'ac') |
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362 [] |
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363 >>> difflineranges2(b'ab', b'aCb') |
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364 [(2, 2)] |
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365 >>> difflineranges2(b'abc', b'aBc') |
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366 [(2, 2)] |
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367 >>> difflineranges2(b'ab', b'AB') |
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368 [(1, 2)] |
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369 >>> difflineranges2(b'abcde', b'aBcDe') |
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370 [(2, 2), (4, 4)] |
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371 >>> difflineranges2(b'abcde', b'aBCDe') |
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372 [(2, 4)] |
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373 """ |
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374 ranges = [] |
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375 for lines, kind in mdiff.allblocks(content1, content2): |
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376 firstline, lastline = lines[2:4] |
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377 if kind == '!' and firstline != lastline: |
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378 ranges.append((firstline + 1, lastline)) |
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379 return ranges |
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380 |
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381 def getbasectxs(repo, opts, revstofix): |
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382 """Returns a map of the base contexts for each revision |
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383 |
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384 The base contexts determine which lines are considered modified when we |
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385 attempt to fix just the modified lines in a file. |
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386 """ |
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387 # The --base flag overrides the usual logic, and we give every revision |
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388 # exactly the set of baserevs that the user specified. |
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389 if opts.get('base'): |
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390 baserevs = set(scmutil.revrange(repo, opts.get('base'))) |
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391 if not baserevs: |
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392 baserevs = {nullrev} |
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393 basectxs = {repo[rev] for rev in baserevs} |
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394 return {rev: basectxs for rev in revstofix} |
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395 |
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396 # Proceed in topological order so that we can easily determine each |
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397 # revision's baserevs by looking at its parents and their baserevs. |
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398 basectxs = collections.defaultdict(set) |
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399 for rev in sorted(revstofix): |
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400 ctx = repo[rev] |
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401 for pctx in ctx.parents(): |
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402 if pctx.rev() in basectxs: |
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403 basectxs[rev].update(basectxs[pctx.rev()]) |
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404 else: |
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405 basectxs[rev].add(pctx) |
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406 return basectxs |
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407 |
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408 def fixfile(ui, opts, fixers, fixctx, path, basectxs): |
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409 """Run any configured fixers that should affect the file in this context |
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410 |
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411 Returns the file content that results from applying the fixers in some order |
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412 starting with the file's content in the fixctx. Fixers that support line |
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413 ranges will affect lines that have changed relative to any of the basectxs |
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414 (i.e. they will only avoid lines that are common to all basectxs). |
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415 """ |
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416 newdata = fixctx[path].data() |
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417 for fixername, fixer in fixers.iteritems(): |
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418 if fixer.affects(opts, fixctx, path): |
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419 ranges = lineranges(opts, path, basectxs, fixctx, newdata) |
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420 command = fixer.command(ui, path, ranges) |
37183
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421 if command is None: |
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422 continue |
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423 ui.debug('subprocess: %s\n' % (command,)) |
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424 proc = subprocess.Popen( |
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425 command, |
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426 shell=True, |
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427 cwd='/', |
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428 stdin=subprocess.PIPE, |
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429 stdout=subprocess.PIPE, |
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430 stderr=subprocess.PIPE) |
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431 newerdata, stderr = proc.communicate(newdata) |
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432 if stderr: |
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433 showstderr(ui, fixctx.rev(), fixername, stderr) |
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434 else: |
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435 newdata = newerdata |
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436 return newdata |
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437 |
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438 def showstderr(ui, rev, fixername, stderr): |
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439 """Writes the lines of the stderr string as warnings on the ui |
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440 |
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441 Uses the revision number and fixername to give more context to each line of |
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442 the error message. Doesn't include file names, since those take up a lot of |
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443 space and would tend to be included in the error message if they were |
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444 relevant. |
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445 """ |
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446 for line in re.split('[\r\n]+', stderr): |
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447 if line: |
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448 ui.warn(('[')) |
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449 if rev is None: |
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450 ui.warn(_('wdir'), label='evolve.rev') |
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451 else: |
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452 ui.warn((str(rev)), label='evolve.rev') |
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453 ui.warn(('] %s: %s\n') % (fixername, line)) |
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454 |
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455 def writeworkingdir(repo, ctx, filedata, replacements): |
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456 """Write new content to the working copy and check out the new p1 if any |
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457 |
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458 We check out a new revision if and only if we fixed something in both the |
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459 working directory and its parent revision. This avoids the need for a full |
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460 update/merge, and means that the working directory simply isn't affected |
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461 unless the --working-dir flag is given. |
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462 |
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463 Directly updates the dirstate for the affected files. |
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464 """ |
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465 for path, data in filedata.iteritems(): |
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466 fctx = ctx[path] |
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467 fctx.write(data, fctx.flags()) |
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468 if repo.dirstate[path] == 'n': |
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469 repo.dirstate.normallookup(path) |
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470 |
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471 oldparentnodes = repo.dirstate.parents() |
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472 newparentnodes = [replacements.get(n, n) for n in oldparentnodes] |
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473 if newparentnodes != oldparentnodes: |
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474 repo.setparents(*newparentnodes) |
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475 |
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476 def replacerev(ui, repo, ctx, filedata, replacements): |
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477 """Commit a new revision like the given one, but with file content changes |
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478 |
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479 "ctx" is the original revision to be replaced by a modified one. |
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480 |
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481 "filedata" is a dict that maps paths to their new file content. All other |
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482 paths will be recreated from the original revision without changes. |
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483 "filedata" may contain paths that didn't exist in the original revision; |
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484 they will be added. |
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485 |
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486 "replacements" is a dict that maps a single node to a single node, and it is |
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487 updated to indicate the original revision is replaced by the newly created |
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488 one. No entry is added if the replacement's node already exists. |
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489 |
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490 The new revision has the same parents as the old one, unless those parents |
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491 have already been replaced, in which case those replacements are the parents |
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492 of this new revision. Thus, if revisions are replaced in topological order, |
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493 there is no need to rebase them into the original topology later. |
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494 """ |
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495 |
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496 p1rev, p2rev = repo.changelog.parentrevs(ctx.rev()) |
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497 p1ctx, p2ctx = repo[p1rev], repo[p2rev] |
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498 newp1node = replacements.get(p1ctx.node(), p1ctx.node()) |
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499 newp2node = replacements.get(p2ctx.node(), p2ctx.node()) |
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500 |
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501 def filectxfn(repo, memctx, path): |
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502 if path not in ctx: |
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503 return None |
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504 fctx = ctx[path] |
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505 copied = fctx.renamed() |
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506 if copied: |
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507 copied = copied[0] |
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508 return context.memfilectx( |
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509 repo, |
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510 memctx, |
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511 path=fctx.path(), |
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512 data=filedata.get(path, fctx.data()), |
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513 islink=fctx.islink(), |
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514 isexec=fctx.isexec(), |
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515 copied=copied) |
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516 |
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517 memctx = context.memctx( |
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518 repo, |
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519 parents=(newp1node, newp2node), |
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520 text=ctx.description(), |
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521 files=set(ctx.files()) | set(filedata.keys()), |
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522 filectxfn=filectxfn, |
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523 user=ctx.user(), |
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524 date=ctx.date(), |
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525 extra=ctx.extra(), |
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526 branch=ctx.branch(), |
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527 editor=None) |
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528 sucnode = memctx.commit() |
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529 prenode = ctx.node() |
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530 if prenode == sucnode: |
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531 ui.debug('node %s already existed\n' % (ctx.hex())) |
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532 else: |
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533 replacements[ctx.node()] = sucnode |
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534 |
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535 def getfixers(ui): |
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536 """Returns a map of configured fixer tools indexed by their names |
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537 |
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538 Each value is a Fixer object with methods that implement the behavior of the |
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539 fixer's config suboptions. Does not validate the config values. |
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540 """ |
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541 result = {} |
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542 for name in fixernames(ui): |
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543 result[name] = Fixer() |
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544 attrs = ui.configsuboptions('fix', name)[1] |
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545 for key in FIXER_ATTRS: |
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546 setattr(result[name], pycompat.sysstr('_' + key), |
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547 attrs.get(key, '')) |
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548 return result |
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549 |
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550 def fixernames(ui): |
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551 """Returns the names of [fix] config options that have suboptions""" |
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552 names = set() |
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553 for k, v in ui.configitems('fix'): |
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554 if ':' in k: |
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555 names.add(k.split(':', 1)[0]) |
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556 return names |
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557 |
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558 class Fixer(object): |
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559 """Wraps the raw config values for a fixer with methods""" |
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560 |
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561 def affects(self, opts, fixctx, path): |
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562 """Should this fixer run on the file at the given path and context?""" |
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563 return scmutil.match(fixctx, [self._fileset], opts)(path) |
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564 |
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565 def command(self, ui, path, ranges): |
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566 """A shell command to use to invoke this fixer on the given file/lines |
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567 |
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568 May return None if there is no appropriate command to run for the given |
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569 parameters. |
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570 """ |
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571 expand = cmdutil.rendercommandtemplate |
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572 parts = [expand(ui, self._command, |
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573 {'rootpath': path, 'basename': os.path.basename(path)})] |
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574 if self._linerange: |
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575 if not ranges: |
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576 # No line ranges to fix, so don't run the fixer. |
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577 return None |
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578 for first, last in ranges: |
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579 parts.append(expand(ui, self._linerange, |
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580 {'first': first, 'last': last})) |
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581 return ' '.join(parts) |