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annotate hgext3rd/evolve/exthelper.py @ 2043:c64300906a32

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exthelper: move command declaration into the exthelper This is necessary to allow sub module to declare commands too.
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
date Sat, 04 Mar 2017 03:37:32 +0100
parents 206a7b864c05
children d31ad31e456b
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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 cmdutil,
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7 commands,
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8 extensions,
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9 revset,
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10 templatekw,
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11 )
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12
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13 class exthelper(object):
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14 """Helper for modular extension setup
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15
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16 A single helper should be instantiated for each extension. Helper
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17 methods are then used as decorators for various purpose.
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18
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19 All decorators return the original function and may be chained.
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20 """
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21
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22 def __init__(self):
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23 self._uicallables = []
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24 self._extcallables = []
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25 self._repocallables = []
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26 self._revsetsymbols = []
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27 self._templatekws = []
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28 self._commandwrappers = []
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29 self._extcommandwrappers = []
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30 self._functionwrappers = []
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31 self._duckpunchers = []
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32 self.cmdtable = {}
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33 self.command = cmdutil.command(self.cmdtable)
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34
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35 def merge(self, other):
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36 """merge the data collected by another exthelper into this one"""
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37 self._uicallables.extend(other._uicallables)
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38 self._extcallables.extend(other._extcallables)
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39 self._repocallables.extend(other._repocallables)
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40 self._revsetsymbols.extend(other._revsetsymbols)
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41 self._templatekws.extend(other._templatekws)
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42 self._commandwrappers.extend(other._commandwrappers)
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43 self._extcommandwrappers.extend(other._extcommandwrappers)
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44 self._functionwrappers.extend(other._functionwrappers)
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45 self._duckpunchers.extend(other._duckpunchers)
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46 self.cmdtable.update(other.cmdtable)
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47
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48 def final_uisetup(self, ui):
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49 """Method to be used as the extension uisetup
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50
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51 The following operations belong here:
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52
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53 - Changes to ui.__class__ . The ui object that will be used to run the
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54 command has not yet been created. Changes made here will affect ui
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55 objects created after this, and in particular the ui that will be
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56 passed to runcommand
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57 - Command wraps (extensions.wrapcommand)
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58 - Changes that need to be visible to other extensions: because
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59 initialization occurs in phases (all extensions run uisetup, then all
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60 run extsetup), a change made here will be visible to other extensions
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61 during extsetup
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62 - Monkeypatch or wrap function (extensions.wrapfunction) of dispatch
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63 module members
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64 - Setup of pre-* and post-* hooks
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65 - pushkey setup
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66 """
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67 for cont, funcname, func in self._duckpunchers:
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68 setattr(cont, funcname, func)
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69 for command, wrapper, opts in self._commandwrappers:
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70 entry = extensions.wrapcommand(commands.table, command, wrapper)
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71 if opts:
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72 for short, long, val, msg in opts:
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73 entry[1].append((short, long, val, msg))
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74 for cont, funcname, wrapper in self._functionwrappers:
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75 extensions.wrapfunction(cont, funcname, wrapper)
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76 for c in self._uicallables:
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77 c(ui)
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78
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79 def final_extsetup(self, ui):
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80 """Method to be used as a the extension extsetup
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81
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82 The following operations belong here:
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83
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84 - Changes depending on the status of other extensions. (if
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85 extensions.find('mq'))
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86 - Add a global option to all commands
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87 - Register revset functions
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88 """
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89 knownexts = {}
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90 for name, symbol in self._revsetsymbols:
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91 revset.symbols[name] = symbol
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92 for name, kw in self._templatekws:
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93 templatekw.keywords[name] = kw
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94 for ext, command, wrapper, opts in self._extcommandwrappers:
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95 if ext not in knownexts:
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96 try:
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97 e = extensions.find(ext)
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98 except KeyError:
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99 # Extension isn't enabled, so don't bother trying to wrap
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100 # it.
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101 continue
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102 knownexts[ext] = e.cmdtable
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103 entry = extensions.wrapcommand(knownexts[ext], command, wrapper)
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104 if opts:
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105 for short, long, val, msg in opts:
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106 entry[1].append((short, long, val, msg))
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107
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108 for c in self._extcallables:
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109 c(ui)
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110
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111 def final_reposetup(self, ui, repo):
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112 """Method to be used as the extension reposetup
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113
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114 The following operations belong here:
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115
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116 - All hooks but pre-* and post-*
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117 - Modify configuration variables
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118 - Changes to repo.__class__, repo.dirstate.__class__
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119 """
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120 for c in self._repocallables:
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121 c(ui, repo)
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122
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123 def uisetup(self, call):
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124 """Decorated function will be executed during uisetup
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125
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126 example::
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127
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128 @eh.uisetup
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129 def setupbabar(ui):
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130 print 'this is uisetup!'
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131 """
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132 self._uicallables.append(call)
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133 return call
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134
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135 def extsetup(self, call):
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136 """Decorated function will be executed during extsetup
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137
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138 example::
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139
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140 @eh.extsetup
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141 def setupcelestine(ui):
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142 print 'this is extsetup!'
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143 """
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144 self._extcallables.append(call)
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145 return call
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146
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147 def reposetup(self, call):
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148 """Decorated function will be executed during reposetup
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149
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150 example::
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151
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152 @eh.reposetup
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153 def setupzephir(ui, repo):
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154 print 'this is reposetup!'
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155 """
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156 self._repocallables.append(call)
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157 return call
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158
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159 def revset(self, symbolname):
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160 """Decorated function is a revset symbol
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161
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162 The name of the symbol must be given as the decorator argument.
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163 The symbol is added during `extsetup`.
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164
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165 example::
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166
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167 @eh.revset('hidden')
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168 def revsetbabar(repo, subset, x):
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169 args = revset.getargs(x, 0, 0, 'babar accept no argument')
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170 return [r for r in subset if 'babar' in repo[r].description()]
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171 """
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172 def dec(symbol):
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173 self._revsetsymbols.append((symbolname, symbol))
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174 return symbol
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175 return dec
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176
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177 def templatekw(self, keywordname):
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178 """Decorated function is a template keyword
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179
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180 The name of the keyword must be given as the decorator argument.
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181 The symbol is added during `extsetup`.
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182
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183 example::
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184
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185 @eh.templatekw('babar')
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186 def kwbabar(ctx):
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187 return 'babar'
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188 """
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189 def dec(keyword):
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190 self._templatekws.append((keywordname, keyword))
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191 return keyword
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192 return dec
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193
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194 def wrapcommand(self, command, extension=None, opts=[]):
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195 """Decorated function is a command wrapper
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196
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197 The name of the command must be given as the decorator argument.
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198 The wrapping is installed during `uisetup`.
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199
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200 If the second option `extension` argument is provided, the wrapping
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201 will be applied in the extension commandtable. This argument must be a
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202 string that will be searched using `extension.find` if not found and
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203 Abort error is raised. If the wrapping applies to an extension, it is
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204 installed during `extsetup`.
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205
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206 example::
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207
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208 @eh.wrapcommand('summary')
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209 def wrapsummary(orig, ui, repo, *args, **kwargs):
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210 ui.note('Barry!')
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211 return orig(ui, repo, *args, **kwargs)
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212
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213 The `opts` argument allows specifying additional arguments for the
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214 command.
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215
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216 """
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217 def dec(wrapper):
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218 if extension is None:
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219 self._commandwrappers.append((command, wrapper, opts))
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220 else:
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221 self._extcommandwrappers.append((extension, command, wrapper,
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222 opts))
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223 return wrapper
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224 return dec
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225
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226 def wrapfunction(self, container, funcname):
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227 """Decorated function is a function wrapper
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228
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229 This function takes two arguments, the container and the name of the
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230 function to wrap. The wrapping is performed during `uisetup`.
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231 (there is no extension support)
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232
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233 example::
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234
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235 @eh.function(discovery, 'checkheads')
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236 def wrapfunction(orig, *args, **kwargs):
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237 ui.note('His head smashed in and his heart cut out')
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238 return orig(*args, **kwargs)
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239 """
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240 def dec(wrapper):
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241 self._functionwrappers.append((container, funcname, wrapper))
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242 return wrapper
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243 return dec
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244
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245 def addattr(self, container, funcname):
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246 """Decorated function is to be added to the container
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247
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248 This function takes two arguments, the container and the name of the
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249 function to wrap. The wrapping is performed during `uisetup`.
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250
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251 example::
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252
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253 @eh.function(context.changectx, 'babar')
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254 def babar(ctx):
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255 return 'babar' in ctx.description
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256 """
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257 def dec(func):
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258 self._duckpunchers.append((container, funcname, func))
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259 return func
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260 return dec