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annotate mercurial/exthelper.py @ 41069:0358cca1dccf

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exthelper: reintroduce the ability to register revsets I think this is what Yuya and Boris agreed on.[1] This happens *after* the extsetup phase now (and after the _aftercallback notifications). But this is trivial, mergeable between exthelper instances, and doesn't need to have the extension name supplied when registering. The test needed updating so that extsetup() takes a `ui` argument, as exthelper isn't trying to be backward compatible with 1.3.1. [1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2018-December/125888.html
author Matt Harbison <matt_harbison@yahoo.com>
date Thu, 27 Dec 2018 21:26:17 -0500
parents 7250cbaabde0
children 70ca0e846d25
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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 registrar,
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19 )
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20
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21 class exthelper(object):
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22 """Helper for modular extension setup
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23
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24 A single helper should be instantiated for each extension. Helper
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25 methods are then used as decorators for various purpose.
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26
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27 All decorators return the original function and may be chained.
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28 """
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29
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30 def __init__(self):
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31 self._uipopulatecallables = []
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32 self._uicallables = []
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33 self._extcallables = []
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34 self._repocallables = []
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35 self._commandwrappers = []
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36 self._extcommandwrappers = []
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37 self._functionwrappers = []
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38 self._duckpunchers = []
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39 self.cmdtable = {}
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40 self.command = registrar.command(self.cmdtable)
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41 self.configtable = {}
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42 self.configitem = registrar.configitem(self.configtable)
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43 self.revsetpredicate = registrar.revsetpredicate()
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44
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45 def merge(self, other):
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46 self._uicallables.extend(other._uicallables)
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47 self._uipopulatecallables.extend(other._uipopulatecallables)
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48 self._extcallables.extend(other._extcallables)
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49 self._repocallables.extend(other._repocallables)
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50 self.revsetpredicate._table.update(other.revsetpredicate._table)
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51 self._commandwrappers.extend(other._commandwrappers)
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52 self._extcommandwrappers.extend(other._extcommandwrappers)
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53 self._functionwrappers.extend(other._functionwrappers)
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54 self._duckpunchers.extend(other._duckpunchers)
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55 self.cmdtable.update(other.cmdtable)
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56 for section, items in other.configtable.iteritems():
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57 if section in self.configtable:
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58 self.configtable[section].update(items)
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59 else:
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60 self.configtable[section] = items
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61
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62 def finaluisetup(self, ui):
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63 """Method to be used as the extension uisetup
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64
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65 The following operations belong here:
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66
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67 - Changes to ui.__class__ . The ui object that will be used to run the
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68 command has not yet been created. Changes made here will affect ui
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69 objects created after this, and in particular the ui that will be
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70 passed to runcommand
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71 - Command wraps (extensions.wrapcommand)
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72 - Changes that need to be visible to other extensions: because
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73 initialization occurs in phases (all extensions run uisetup, then all
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74 run extsetup), a change made here will be visible to other extensions
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75 during extsetup
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76 - Monkeypatch or wrap function (extensions.wrapfunction) of dispatch
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77 module members
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78 - Setup of pre-* and post-* hooks
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79 - pushkey setup
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80 """
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81 for cont, funcname, func in self._duckpunchers:
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82 setattr(cont, funcname, func)
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83 for command, wrapper, opts in self._commandwrappers:
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84 entry = extensions.wrapcommand(commands.table, command, wrapper)
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85 if opts:
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86 for opt in opts:
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87 entry[1].append(opt)
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88 for cont, funcname, wrapper in self._functionwrappers:
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89 extensions.wrapfunction(cont, funcname, wrapper)
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90 for c in self._uicallables:
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91 c(ui)
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92
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93 def finaluipopulate(self, ui):
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94 """Method to be used as the extension uipopulate
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95
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96 This is called once per ui instance to:
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97
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98 - Set up additional ui members
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99 - Update configuration by ``ui.setconfig()``
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100 - Extend the class dynamically
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101 """
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102 for c in self._uipopulatecallables:
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103 c(ui)
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104
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105 def finalextsetup(self, ui):
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106 """Method to be used as a the extension extsetup
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107
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108 The following operations belong here:
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109
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110 - Changes depending on the status of other extensions. (if
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111 extensions.find('mq'))
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112 - Add a global option to all commands
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113 """
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114 knownexts = {}
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115
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116 for ext, command, wrapper, opts in self._extcommandwrappers:
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117 if ext not in knownexts:
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118 try:
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119 e = extensions.find(ext)
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120 except KeyError:
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121 # Extension isn't enabled, so don't bother trying to wrap
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122 # it.
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123 continue
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124 knownexts[ext] = e.cmdtable
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125 entry = extensions.wrapcommand(knownexts[ext], command, wrapper)
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126 if opts:
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127 for opt in opts:
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128 entry[1].append(opt)
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129
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130 for c in self._extcallables:
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131 c(ui)
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132
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133 def finalreposetup(self, ui, repo):
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134 """Method to be used as the extension reposetup
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135
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136 The following operations belong here:
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137
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138 - All hooks but pre-* and post-*
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139 - Modify configuration variables
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140 - Changes to repo.__class__, repo.dirstate.__class__
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141 """
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142 for c in self._repocallables:
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143 c(ui, repo)
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144
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145 def uisetup(self, call):
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146 """Decorated function will be executed during uisetup
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147
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148 example::
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149
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150 @eh.uisetup
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151 def setupbabar(ui):
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152 print 'this is uisetup!'
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153 """
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154 self._uicallables.append(call)
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155 return call
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156
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157 def uipopulate(self, call):
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158 """Decorated function will be executed during uipopulate
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159
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160 example::
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161
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162 @eh.uipopulate
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163 def setupfoo(ui):
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164 print 'this is uipopulate!'
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165 """
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166 self._uipopulatecallables.append(call)
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167 return call
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168
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169 def extsetup(self, call):
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170 """Decorated function will be executed during extsetup
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171
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172 example::
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173
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174 @eh.extsetup
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175 def setupcelestine(ui):
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176 print 'this is extsetup!'
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177 """
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178 self._extcallables.append(call)
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179 return call
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180
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181 def reposetup(self, call):
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182 """Decorated function will be executed during reposetup
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183
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184 example::
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185
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186 @eh.reposetup
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187 def setupzephir(ui, repo):
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188 print 'this is reposetup!'
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189 """
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190 self._repocallables.append(call)
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191 return call
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192
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193 def wrapcommand(self, command, extension=None, opts=None):
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194 """Decorated function is a command wrapper
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195
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196 The name of the command must be given as the decorator argument.
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197 The wrapping is installed during `uisetup`.
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198
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199 If the second option `extension` argument is provided, the wrapping
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200 will be applied in the extension commandtable. This argument must be a
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201 string that will be searched using `extension.find` if not found and
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202 Abort error is raised. If the wrapping applies to an extension, it is
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203 installed during `extsetup`.
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204
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205 example::
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206
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207 @eh.wrapcommand('summary')
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208 def wrapsummary(orig, ui, repo, *args, **kwargs):
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209 ui.note('Barry!')
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210 return orig(ui, repo, *args, **kwargs)
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211
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212 The `opts` argument allows specifying a list of tuples for additional
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213 arguments for the command. See ``mercurial.fancyopts.fancyopts()`` for
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214 the format of the tuple.
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215
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216 """
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217 if opts is None:
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218 opts = []
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219 else:
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220 for opt in opts:
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221 if not isinstance(opt, tuple):
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222 raise error.ProgrammingError('opts must be list of tuples')
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223 if len(opt) not in (4, 5):
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224 msg = 'each opt tuple must contain 4 or 5 values'
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225 raise error.ProgrammingError(msg)
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226
41047
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227 def dec(wrapper):
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228 if extension is None:
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229 self._commandwrappers.append((command, wrapper, opts))
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230 else:
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231 self._extcommandwrappers.append((extension, command, wrapper,
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232 opts))
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233 return wrapper
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234 return dec
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235
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236 def wrapfunction(self, container, funcname):
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237 """Decorated function is a function wrapper
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238
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239 This function takes two arguments, the container and the name of the
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240 function to wrap. The wrapping is performed during `uisetup`.
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241 (there is no extension support)
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242
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243 example::
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244
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245 @eh.function(discovery, 'checkheads')
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246 def wrapfunction(orig, *args, **kwargs):
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247 ui.note('His head smashed in and his heart cut out')
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248 return orig(*args, **kwargs)
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249 """
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250 def dec(wrapper):
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251 self._functionwrappers.append((container, funcname, wrapper))
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252 return wrapper
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253 return dec
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254
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255 def addattr(self, container, funcname):
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256 """Decorated function is to be added to the container
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257
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258 This function takes two arguments, the container and the name of the
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259 function to wrap. The wrapping is performed during `uisetup`.
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260
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261 Adding attributes to a container like this is discouraged, because the
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262 container modification is visible even in repositories that do not
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263 have the extension loaded. Therefore, care must be taken that the
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264 function doesn't make assumptions that the extension was loaded for the
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265 current repository. For `ui` and `repo` instances, a better option is
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266 to subclass the instance in `uipopulate` and `reposetup` respectively.
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267
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268 https://www.mercurial-scm.org/wiki/WritingExtensions
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269
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270 example::
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271
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272 @eh.addattr(context.changectx, 'babar')
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273 def babar(ctx):
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274 return 'babar' in ctx.description
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275 """
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276 def dec(func):
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277 self._duckpunchers.append((container, funcname, func))
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278 return func
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279 return dec