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annotate hgext3rd/evolve/exthelper.py @ 2041:3b6550261614

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exthelper: extract into its own submodule That code is fairly independant, we extract it into its own extensions to clarify the code
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
date Sat, 04 Mar 2017 01:21:43 +0100
parents hgext3rd/evolve/__init__.py@dd7e092a854a
children 206a7b864c05
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1 #####################################################################
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2 ### Extension helper ###
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3 #####################################################################
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4
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5 from mercurial import (
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6 commands,
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7 extensions,
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8 revset,
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9 templatekw,
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10 )
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11
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12 class exthelper(object):
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13 """Helper for modular extension setup
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14
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15 A single helper should be instantiated for each extension. Helper
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16 methods are then used as decorators for various purpose.
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17
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18 All decorators return the original function and may be chained.
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19 """
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20
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21 def __init__(self):
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22 self._uicallables = []
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23 self._extcallables = []
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24 self._repocallables = []
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25 self._revsetsymbols = []
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26 self._templatekws = []
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27 self._commandwrappers = []
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28 self._extcommandwrappers = []
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29 self._functionwrappers = []
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30 self._duckpunchers = []
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31
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32 def final_uisetup(self, ui):
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33 """Method to be used as the extension uisetup
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34
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35 The following operations belong here:
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36
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37 - Changes to ui.__class__ . The ui object that will be used to run the
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38 command has not yet been created. Changes made here will affect ui
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39 objects created after this, and in particular the ui that will be
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40 passed to runcommand
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41 - Command wraps (extensions.wrapcommand)
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42 - Changes that need to be visible to other extensions: because
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43 initialization occurs in phases (all extensions run uisetup, then all
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44 run extsetup), a change made here will be visible to other extensions
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45 during extsetup
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46 - Monkeypatch or wrap function (extensions.wrapfunction) of dispatch
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47 module members
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48 - Setup of pre-* and post-* hooks
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49 - pushkey setup
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50 """
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51 for cont, funcname, func in self._duckpunchers:
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52 setattr(cont, funcname, func)
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53 for command, wrapper, opts in self._commandwrappers:
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54 entry = extensions.wrapcommand(commands.table, command, wrapper)
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55 if opts:
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56 for short, long, val, msg in opts:
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57 entry[1].append((short, long, val, msg))
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58 for cont, funcname, wrapper in self._functionwrappers:
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59 extensions.wrapfunction(cont, funcname, wrapper)
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60 for c in self._uicallables:
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61 c(ui)
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62
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63 def final_extsetup(self, ui):
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64 """Method to be used as a the extension extsetup
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65
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66 The following operations belong here:
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67
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68 - Changes depending on the status of other extensions. (if
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69 extensions.find('mq'))
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70 - Add a global option to all commands
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71 - Register revset functions
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72 """
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73 knownexts = {}
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74 for name, symbol in self._revsetsymbols:
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75 revset.symbols[name] = symbol
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76 for name, kw in self._templatekws:
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77 templatekw.keywords[name] = kw
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78 for ext, command, wrapper, opts in self._extcommandwrappers:
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79 if ext not in knownexts:
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80 try:
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81 e = extensions.find(ext)
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82 except KeyError:
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83 # Extension isn't enabled, so don't bother trying to wrap
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84 # it.
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85 continue
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86 knownexts[ext] = e.cmdtable
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87 entry = extensions.wrapcommand(knownexts[ext], command, wrapper)
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88 if opts:
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89 for short, long, val, msg in opts:
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90 entry[1].append((short, long, val, msg))
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91
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92 for c in self._extcallables:
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93 c(ui)
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94
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95 def final_reposetup(self, ui, repo):
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96 """Method to be used as the extension reposetup
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97
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98 The following operations belong here:
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99
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100 - All hooks but pre-* and post-*
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101 - Modify configuration variables
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102 - Changes to repo.__class__, repo.dirstate.__class__
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103 """
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104 for c in self._repocallables:
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105 c(ui, repo)
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106
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107 def uisetup(self, call):
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108 """Decorated function will be executed during uisetup
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109
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110 example::
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111
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112 @eh.uisetup
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113 def setupbabar(ui):
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114 print 'this is uisetup!'
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115 """
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116 self._uicallables.append(call)
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117 return call
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118
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119 def extsetup(self, call):
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120 """Decorated function will be executed during extsetup
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121
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122 example::
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123
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124 @eh.extsetup
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125 def setupcelestine(ui):
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126 print 'this is extsetup!'
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127 """
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128 self._extcallables.append(call)
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129 return call
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130
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131 def reposetup(self, call):
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132 """Decorated function will be executed during reposetup
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133
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134 example::
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135
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136 @eh.reposetup
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137 def setupzephir(ui, repo):
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138 print 'this is reposetup!'
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139 """
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140 self._repocallables.append(call)
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141 return call
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142
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143 def revset(self, symbolname):
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144 """Decorated function is a revset symbol
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145
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146 The name of the symbol must be given as the decorator argument.
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147 The symbol is added during `extsetup`.
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148
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149 example::
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150
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151 @eh.revset('hidden')
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152 def revsetbabar(repo, subset, x):
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153 args = revset.getargs(x, 0, 0, 'babar accept no argument')
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154 return [r for r in subset if 'babar' in repo[r].description()]
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155 """
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156 def dec(symbol):
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157 self._revsetsymbols.append((symbolname, symbol))
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158 return symbol
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159 return dec
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160
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161 def templatekw(self, keywordname):
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162 """Decorated function is a template keyword
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163
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164 The name of the keyword must be given as the decorator argument.
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165 The symbol is added during `extsetup`.
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166
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167 example::
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168
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169 @eh.templatekw('babar')
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170 def kwbabar(ctx):
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171 return 'babar'
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172 """
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173 def dec(keyword):
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174 self._templatekws.append((keywordname, keyword))
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175 return keyword
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176 return dec
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177
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178 def wrapcommand(self, command, extension=None, opts=[]):
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179 """Decorated function is a command wrapper
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180
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181 The name of the command must be given as the decorator argument.
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182 The wrapping is installed during `uisetup`.
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183
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184 If the second option `extension` argument is provided, the wrapping
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185 will be applied in the extension commandtable. This argument must be a
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186 string that will be searched using `extension.find` if not found and
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187 Abort error is raised. If the wrapping applies to an extension, it is
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188 installed during `extsetup`.
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189
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190 example::
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191
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192 @eh.wrapcommand('summary')
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193 def wrapsummary(orig, ui, repo, *args, **kwargs):
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194 ui.note('Barry!')
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195 return orig(ui, repo, *args, **kwargs)
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196
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197 The `opts` argument allows specifying additional arguments for the
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198 command.
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199
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200 """
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201 def dec(wrapper):
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202 if extension is None:
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203 self._commandwrappers.append((command, wrapper, opts))
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204 else:
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205 self._extcommandwrappers.append((extension, command, wrapper,
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206 opts))
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207 return wrapper
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208 return dec
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209
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210 def wrapfunction(self, container, funcname):
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211 """Decorated function is a function wrapper
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212
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213 This function takes two arguments, the container and the name of the
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214 function to wrap. The wrapping is performed during `uisetup`.
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215 (there is no extension support)
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216
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217 example::
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218
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219 @eh.function(discovery, 'checkheads')
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220 def wrapfunction(orig, *args, **kwargs):
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221 ui.note('His head smashed in and his heart cut out')
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222 return orig(*args, **kwargs)
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223 """
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224 def dec(wrapper):
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225 self._functionwrappers.append((container, funcname, wrapper))
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226 return wrapper
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227 return dec
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228
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229 def addattr(self, container, funcname):
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230 """Decorated function is to be added to the container
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231
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232 This function takes two arguments, the container and the name of the
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233 function to wrap. The wrapping is performed during `uisetup`.
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234
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235 example::
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236
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237 @eh.function(context.changectx, 'babar')
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238 def babar(ctx):
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239 return 'babar' in ctx.description
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240 """
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241 def dec(func):
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242 self._duckpunchers.append((container, funcname, func))
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243 return func
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244 return dec