Mercurial > hg
annotate mercurial/exthelper.py @ 46645:7711853110b9
typing: add some type annotations to mercurial/util.py
Differential Revision: https://phab.mercurial-scm.org/D10127
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Sat, 06 Mar 2021 23:41:32 -0500 |
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1 # Copyright 2012 Logilab SA <contact@logilab.fr> |
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2 # Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
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3 # Octobus <contact@octobus.net> |
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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 ##################################################################### |
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9 ### Extension helper ### |
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10 ##################################################################### |
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11 |
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12 from __future__ import absolute_import |
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13 |
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14 from . import ( |
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15 commands, |
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16 error, |
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17 extensions, |
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18 pycompat, |
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19 registrar, |
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20 ) |
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21 |
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22 from hgdemandimport import tracing |
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23 |
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24 |
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25 class exthelper(object): |
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26 """Helper for modular extension setup |
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27 |
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28 A single helper should be instantiated for each module of an |
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29 extension, where a command or function needs to be wrapped, or a |
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30 command, extension hook, fileset, revset or template needs to be |
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31 registered. Helper methods are then used as decorators for |
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32 these various purposes. If an extension spans multiple modules, |
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33 all helper instances should be merged in the main module. |
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34 |
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35 All decorators return the original function and may be chained. |
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36 |
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37 Aside from the helper functions with examples below, several |
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38 registrar method aliases are available for adding commands, |
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39 configitems, filesets, revsets, and templates. Simply decorate |
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40 the appropriate methods, and assign the corresponding exthelper |
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41 variable to a module level variable of the extension. The |
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42 extension loading mechanism will handle the rest. |
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43 |
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44 example:: |
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45 |
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46 # ext.py |
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47 eh = exthelper.exthelper() |
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48 |
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49 # As needed: |
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50 cmdtable = eh.cmdtable |
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51 configtable = eh.configtable |
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52 filesetpredicate = eh.filesetpredicate |
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53 revsetpredicate = eh.revsetpredicate |
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54 templatekeyword = eh.templatekeyword |
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55 |
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56 @eh.command(b'mynewcommand', |
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57 [(b'r', b'rev', [], _(b'operate on these revisions'))], |
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58 _(b'-r REV...'), |
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59 helpcategory=command.CATEGORY_XXX) |
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60 def newcommand(ui, repo, *revs, **opts): |
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61 # implementation goes here |
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62 |
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63 eh.configitem(b'experimental', b'foo', |
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64 default=False, |
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65 ) |
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66 |
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67 @eh.filesetpredicate(b'lfs()') |
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68 def filesetbabar(mctx, x): |
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69 return mctx.predicate(...) |
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70 |
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71 @eh.revsetpredicate(b'hidden') |
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72 def revsetbabar(repo, subset, x): |
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73 args = revset.getargs(x, 0, 0, b'babar accept no argument') |
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74 return [r for r in subset if b'babar' in repo[r].description()] |
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75 |
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76 @eh.templatekeyword(b'babar') |
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77 def kwbabar(ctx): |
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78 return b'babar' |
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79 """ |
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80 |
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81 def __init__(self): |
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82 self._uipopulatecallables = [] |
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83 self._uicallables = [] |
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84 self._extcallables = [] |
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85 self._repocallables = [] |
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86 self._commandwrappers = [] |
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87 self._extcommandwrappers = [] |
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88 self._functionwrappers = [] |
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89 self.cmdtable = {} |
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90 self.command = registrar.command(self.cmdtable) |
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91 self.configtable = {} |
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92 self.configitem = registrar.configitem(self.configtable) |
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93 self.filesetpredicate = registrar.filesetpredicate() |
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94 self.revsetpredicate = registrar.revsetpredicate() |
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95 self.templatekeyword = registrar.templatekeyword() |
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96 |
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97 def merge(self, other): |
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98 self._uicallables.extend(other._uicallables) |
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99 self._uipopulatecallables.extend(other._uipopulatecallables) |
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100 self._extcallables.extend(other._extcallables) |
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101 self._repocallables.extend(other._repocallables) |
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102 self.filesetpredicate._merge(other.filesetpredicate) |
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103 self.revsetpredicate._merge(other.revsetpredicate) |
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104 self.templatekeyword._merge(other.templatekeyword) |
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105 self._commandwrappers.extend(other._commandwrappers) |
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106 self._extcommandwrappers.extend(other._extcommandwrappers) |
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107 self._functionwrappers.extend(other._functionwrappers) |
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108 self.cmdtable.update(other.cmdtable) |
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109 for section, items in pycompat.iteritems(other.configtable): |
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110 if section in self.configtable: |
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111 self.configtable[section].update(items) |
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112 else: |
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113 self.configtable[section] = items |
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114 |
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115 def finaluisetup(self, ui): |
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116 """Method to be used as the extension uisetup |
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117 |
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118 The following operations belong here: |
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119 |
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120 - Changes to ui.__class__ . The ui object that will be used to run the |
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121 command has not yet been created. Changes made here will affect ui |
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122 objects created after this, and in particular the ui that will be |
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123 passed to runcommand |
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124 - Command wraps (extensions.wrapcommand) |
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125 - Changes that need to be visible to other extensions: because |
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126 initialization occurs in phases (all extensions run uisetup, then all |
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127 run extsetup), a change made here will be visible to other extensions |
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128 during extsetup |
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129 - Monkeypatch or wrap function (extensions.wrapfunction) of dispatch |
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130 module members |
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131 - Setup of pre-* and post-* hooks |
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132 - pushkey setup |
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133 """ |
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134 for command, wrapper, opts in self._commandwrappers: |
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135 entry = extensions.wrapcommand(commands.table, command, wrapper) |
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136 if opts: |
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137 for opt in opts: |
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138 entry[1].append(opt) |
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139 for cont, funcname, wrapper in self._functionwrappers: |
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140 extensions.wrapfunction(cont, funcname, wrapper) |
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141 for c in self._uicallables: |
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142 with tracing.log('finaluisetup: %s', repr(c)): |
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143 c(ui) |
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144 |
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145 def finaluipopulate(self, ui): |
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146 """Method to be used as the extension uipopulate |
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147 |
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148 This is called once per ui instance to: |
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149 |
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150 - Set up additional ui members |
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151 - Update configuration by ``ui.setconfig()`` |
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152 - Extend the class dynamically |
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153 """ |
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154 for c in self._uipopulatecallables: |
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155 c(ui) |
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156 |
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157 def finalextsetup(self, ui): |
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158 """Method to be used as a the extension extsetup |
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159 |
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160 The following operations belong here: |
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161 |
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162 - Changes depending on the status of other extensions. (if |
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163 extensions.find(b'mq')) |
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164 - Add a global option to all commands |
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165 """ |
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166 knownexts = {} |
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167 |
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168 for ext, command, wrapper, opts in self._extcommandwrappers: |
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169 if ext not in knownexts: |
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170 try: |
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171 e = extensions.find(ext) |
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172 except KeyError: |
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173 # Extension isn't enabled, so don't bother trying to wrap |
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174 # it. |
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175 continue |
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176 knownexts[ext] = e.cmdtable |
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177 entry = extensions.wrapcommand(knownexts[ext], command, wrapper) |
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178 if opts: |
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179 for opt in opts: |
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180 entry[1].append(opt) |
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181 |
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182 for c in self._extcallables: |
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183 with tracing.log('finalextsetup: %s', repr(c)): |
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184 c(ui) |
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185 |
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186 def finalreposetup(self, ui, repo): |
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187 """Method to be used as the extension reposetup |
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188 |
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189 The following operations belong here: |
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190 |
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191 - All hooks but pre-* and post-* |
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192 - Modify configuration variables |
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193 - Changes to repo.__class__, repo.dirstate.__class__ |
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194 """ |
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195 for c in self._repocallables: |
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196 with tracing.log('finalreposetup: %s', repr(c)): |
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197 c(ui, repo) |
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198 |
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199 def uisetup(self, call): |
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200 """Decorated function will be executed during uisetup |
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201 |
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202 example:: |
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203 |
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204 @eh.uisetup |
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205 def setupbabar(ui): |
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206 print('this is uisetup!') |
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207 """ |
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208 self._uicallables.append(call) |
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209 return call |
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210 |
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211 def uipopulate(self, call): |
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212 """Decorated function will be executed during uipopulate |
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213 |
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214 example:: |
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215 |
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216 @eh.uipopulate |
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217 def setupfoo(ui): |
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218 print('this is uipopulate!') |
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219 """ |
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220 self._uipopulatecallables.append(call) |
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221 return call |
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222 |
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223 def extsetup(self, call): |
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224 """Decorated function will be executed during extsetup |
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225 |
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226 example:: |
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227 |
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228 @eh.extsetup |
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229 def setupcelestine(ui): |
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230 print('this is extsetup!') |
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231 """ |
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232 self._extcallables.append(call) |
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233 return call |
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234 |
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235 def reposetup(self, call): |
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236 """Decorated function will be executed during reposetup |
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237 |
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238 example:: |
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239 |
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240 @eh.reposetup |
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241 def setupzephir(ui, repo): |
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242 print('this is reposetup!') |
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243 """ |
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244 self._repocallables.append(call) |
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245 return call |
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246 |
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247 def wrapcommand(self, command, extension=None, opts=None): |
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248 """Decorated function is a command wrapper |
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249 |
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250 The name of the command must be given as the decorator argument. |
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251 The wrapping is installed during `uisetup`. |
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252 |
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253 If the second option `extension` argument is provided, the wrapping |
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254 will be applied in the extension commandtable. This argument must be a |
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255 string that will be searched using `extension.find` if not found and |
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256 Abort error is raised. If the wrapping applies to an extension, it is |
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257 installed during `extsetup`. |
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258 |
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259 example:: |
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260 |
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261 @eh.wrapcommand(b'summary') |
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262 def wrapsummary(orig, ui, repo, *args, **kwargs): |
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263 ui.note(b'Barry!') |
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264 return orig(ui, repo, *args, **kwargs) |
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265 |
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266 The `opts` argument allows specifying a list of tuples for additional |
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267 arguments for the command. See ``mercurial.fancyopts.fancyopts()`` for |
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268 the format of the tuple. |
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269 |
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270 """ |
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271 if opts is None: |
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272 opts = [] |
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273 else: |
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274 for opt in opts: |
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275 if not isinstance(opt, tuple): |
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276 raise error.ProgrammingError(b'opts must be list of tuples') |
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277 if len(opt) not in (4, 5): |
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278 msg = b'each opt tuple must contain 4 or 5 values' |
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279 raise error.ProgrammingError(msg) |
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280 |
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281 def dec(wrapper): |
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282 if extension is None: |
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283 self._commandwrappers.append((command, wrapper, opts)) |
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284 else: |
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285 self._extcommandwrappers.append( |
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286 (extension, command, wrapper, opts) |
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287 ) |
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288 return wrapper |
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289 |
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290 return dec |
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291 |
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292 def wrapfunction(self, container, funcname): |
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293 """Decorated function is a function wrapper |
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294 |
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295 This function takes two arguments, the container and the name of the |
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296 function to wrap. The wrapping is performed during `uisetup`. |
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297 (there is no extension support) |
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298 |
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299 example:: |
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300 |
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301 @eh.function(discovery, b'checkheads') |
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302 def wrapfunction(orig, *args, **kwargs): |
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303 ui.note(b'His head smashed in and his heart cut out') |
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304 return orig(*args, **kwargs) |
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305 """ |
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306 |
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307 def dec(wrapper): |
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308 self._functionwrappers.append((container, funcname, wrapper)) |
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309 return wrapper |
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310 |
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311 return dec |