Mercurial > hg
annotate mercurial/registrar.py @ 32078:bf5e13e38390 stable
pager: use less as a fallback on Unix
This seems reasonable choice per discussion, and the default-default of Git.
See also the inline-comment for why.
https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-April/097042.html
author | Yuya Nishihara <yuya@tcha.org> |
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date | Fri, 28 Apr 2017 20:51:14 +0900 |
parents | bdda942f4b9c |
children | 46ba2cdda476 |
rev | line source |
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1 # registrar.py - utilities to register function for specific purpose |
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2 # |
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3 # Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others |
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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 from __future__ import absolute_import |
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9 |
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10 from . import ( |
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11 error, |
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12 pycompat, |
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13 util, |
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14 ) |
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15 |
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16 class _funcregistrarbase(object): |
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17 """Base of decorator to register a function for specific purpose |
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18 |
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19 This decorator stores decorated functions into own dict 'table'. |
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20 |
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21 The least derived class can be defined by overriding 'formatdoc', |
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22 for example:: |
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23 |
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24 class keyword(_funcregistrarbase): |
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25 _docformat = ":%s: %s" |
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26 |
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27 This should be used as below: |
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28 |
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29 keyword = registrar.keyword() |
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30 |
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31 @keyword('bar') |
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32 def barfunc(*args, **kwargs): |
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33 '''Explanation of bar keyword .... |
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34 ''' |
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35 pass |
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36 |
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37 In this case: |
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38 |
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39 - 'barfunc' is stored as 'bar' in '_table' of an instance 'keyword' above |
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40 - 'barfunc.__doc__' becomes ":bar: Explanation of bar keyword" |
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41 """ |
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42 def __init__(self, table=None): |
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43 if table is None: |
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44 self._table = {} |
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45 else: |
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46 self._table = table |
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47 |
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48 def __call__(self, decl, *args, **kwargs): |
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49 return lambda func: self._doregister(func, decl, *args, **kwargs) |
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50 |
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51 def _doregister(self, func, decl, *args, **kwargs): |
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52 name = self._getname(decl) |
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53 |
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54 if name in self._table: |
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55 msg = 'duplicate registration for name: "%s"' % name |
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56 raise error.ProgrammingError(msg) |
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57 |
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58 if func.__doc__ and not util.safehasattr(func, '_origdoc'): |
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59 doc = pycompat.sysbytes(func.__doc__).strip() |
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60 func._origdoc = doc |
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61 func.__doc__ = pycompat.sysstr(self._formatdoc(decl, doc)) |
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62 |
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63 self._table[name] = func |
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64 self._extrasetup(name, func, *args, **kwargs) |
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65 |
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66 return func |
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67 |
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68 def _parsefuncdecl(self, decl): |
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69 """Parse function declaration and return the name of function in it |
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70 """ |
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71 i = decl.find('(') |
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72 if i >= 0: |
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73 return decl[:i] |
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74 else: |
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75 return decl |
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76 |
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77 def _getname(self, decl): |
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78 """Return the name of the registered function from decl |
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79 |
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80 Derived class should override this, if it allows more |
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81 descriptive 'decl' string than just a name. |
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82 """ |
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83 return decl |
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84 |
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85 _docformat = None |
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86 |
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87 def _formatdoc(self, decl, doc): |
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88 """Return formatted document of the registered function for help |
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89 |
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90 'doc' is '__doc__.strip()' of the registered function. |
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91 """ |
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92 return self._docformat % (decl, doc) |
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93 |
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94 def _extrasetup(self, name, func): |
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95 """Execute exra setup for registered function, if needed |
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96 """ |
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97 pass |
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98 |
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99 class revsetpredicate(_funcregistrarbase): |
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100 """Decorator to register revset predicate |
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101 |
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102 Usage:: |
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103 |
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104 revsetpredicate = registrar.revsetpredicate() |
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105 |
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106 @revsetpredicate('mypredicate(arg1, arg2[, arg3])') |
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107 def mypredicatefunc(repo, subset, x): |
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108 '''Explanation of this revset predicate .... |
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109 ''' |
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110 pass |
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111 |
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112 The first string argument is used also in online help. |
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113 |
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114 Optional argument 'safe' indicates whether a predicate is safe for |
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115 DoS attack (False by default). |
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116 |
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117 Optional argument 'takeorder' indicates whether a predicate function |
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118 takes ordering policy as the last argument. |
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119 |
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120 'revsetpredicate' instance in example above can be used to |
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121 decorate multiple functions. |
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122 |
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123 Decorated functions are registered automatically at loading |
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124 extension, if an instance named as 'revsetpredicate' is used for |
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125 decorating in extension. |
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126 |
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127 Otherwise, explicit 'revset.loadpredicate()' is needed. |
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128 """ |
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129 _getname = _funcregistrarbase._parsefuncdecl |
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130 _docformat = "``%s``\n %s" |
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131 |
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132 def _extrasetup(self, name, func, safe=False, takeorder=False): |
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133 func._safe = safe |
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134 func._takeorder = takeorder |
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135 |
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136 class filesetpredicate(_funcregistrarbase): |
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137 """Decorator to register fileset predicate |
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138 |
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139 Usage:: |
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140 |
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141 filesetpredicate = registrar.filesetpredicate() |
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142 |
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143 @filesetpredicate('mypredicate()') |
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144 def mypredicatefunc(mctx, x): |
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145 '''Explanation of this fileset predicate .... |
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146 ''' |
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147 pass |
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148 |
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149 The first string argument is used also in online help. |
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150 |
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151 Optional argument 'callstatus' indicates whether a predicate |
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152 implies 'matchctx.status()' at runtime or not (False, by |
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153 default). |
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154 |
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155 Optional argument 'callexisting' indicates whether a predicate |
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156 implies 'matchctx.existing()' at runtime or not (False, by |
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157 default). |
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158 |
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159 'filesetpredicate' instance in example above can be used to |
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160 decorate multiple functions. |
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161 |
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162 Decorated functions are registered automatically at loading |
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163 extension, if an instance named as 'filesetpredicate' is used for |
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164 decorating in extension. |
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165 |
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166 Otherwise, explicit 'fileset.loadpredicate()' is needed. |
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167 """ |
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168 _getname = _funcregistrarbase._parsefuncdecl |
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169 _docformat = "``%s``\n %s" |
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170 |
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171 def _extrasetup(self, name, func, callstatus=False, callexisting=False): |
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172 func._callstatus = callstatus |
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173 func._callexisting = callexisting |
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174 |
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175 class _templateregistrarbase(_funcregistrarbase): |
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176 """Base of decorator to register functions as template specific one |
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177 """ |
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178 _docformat = ":%s: %s" |
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179 |
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180 class templatekeyword(_templateregistrarbase): |
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181 """Decorator to register template keyword |
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182 |
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183 Usage:: |
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184 |
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185 templatekeyword = registrar.templatekeyword() |
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186 |
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187 @templatekeyword('mykeyword') |
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188 def mykeywordfunc(repo, ctx, templ, cache, revcache, **args): |
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189 '''Explanation of this template keyword .... |
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190 ''' |
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191 pass |
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192 |
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193 The first string argument is used also in online help. |
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194 |
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195 'templatekeyword' instance in example above can be used to |
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196 decorate multiple functions. |
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197 |
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198 Decorated functions are registered automatically at loading |
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199 extension, if an instance named as 'templatekeyword' is used for |
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200 decorating in extension. |
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201 |
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202 Otherwise, explicit 'templatekw.loadkeyword()' is needed. |
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203 """ |
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204 |
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205 class templatefilter(_templateregistrarbase): |
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206 """Decorator to register template filer |
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207 |
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208 Usage:: |
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209 |
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210 templatefilter = registrar.templatefilter() |
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211 |
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212 @templatefilter('myfilter') |
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213 def myfilterfunc(text): |
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214 '''Explanation of this template filter .... |
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215 ''' |
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216 pass |
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217 |
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218 The first string argument is used also in online help. |
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219 |
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220 'templatefilter' instance in example above can be used to |
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221 decorate multiple functions. |
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222 |
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223 Decorated functions are registered automatically at loading |
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224 extension, if an instance named as 'templatefilter' is used for |
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225 decorating in extension. |
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226 |
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227 Otherwise, explicit 'templatefilters.loadkeyword()' is needed. |
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228 """ |
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229 |
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230 class templatefunc(_templateregistrarbase): |
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231 """Decorator to register template function |
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232 |
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233 Usage:: |
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234 |
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235 templatefunc = registrar.templatefunc() |
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236 |
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237 @templatefunc('myfunc(arg1, arg2[, arg3])', argspec='arg1 arg2 arg3') |
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238 def myfuncfunc(context, mapping, args): |
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239 '''Explanation of this template function .... |
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240 ''' |
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241 pass |
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242 |
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243 The first string argument is used also in online help. |
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244 |
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245 If optional 'argspec' is defined, the function will receive 'args' as |
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246 a dict of named arguments. Otherwise 'args' is a list of positional |
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247 arguments. |
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248 |
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249 'templatefunc' instance in example above can be used to |
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250 decorate multiple functions. |
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251 |
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252 Decorated functions are registered automatically at loading |
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253 extension, if an instance named as 'templatefunc' is used for |
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254 decorating in extension. |
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255 |
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256 Otherwise, explicit 'templater.loadfunction()' is needed. |
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257 """ |
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258 _getname = _funcregistrarbase._parsefuncdecl |
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259 |
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260 def _extrasetup(self, name, func, argspec=None): |
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261 func._argspec = argspec |