Mercurial > hg
annotate mercurial/registrar.py @ 47072:4c041c71ec01
revlog: introduce an explicit tracking of what the revlog is about
Since the dawn of time, people have been forced to rely to lossy introspection
of the index filename to determine what the purpose and role of the revlog they
encounter is. This is hacky, error prone, inflexible, abstraction-leaky,
<insert-your-own-complaints-here>.
In f63299ee7e4d Raphaël introduced a new attribute to track this information:
`revlog_kind`. However it is initialized in an odd place and various instances
end up not having it set. In addition is only tracking some of the information
we end up having to introspect in various pieces of code.
So we add a new attribute that holds more data and is more strictly enforced.
This work is done in collaboration with Raphaël.
The `revlog_kind` one will be removed/adapted in the next changeset. We expect
to be able to clean up various existing piece of code and to simplify coming
work around the newer revlog format.
Differential Revision: https://phab.mercurial-scm.org/D10352
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 06 Apr 2021 05:20:24 +0200 |
parents | c1bb02738f96 |
children | 6000f5b25c9b |
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 configitems, |
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12 error, |
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13 pycompat, |
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14 util, |
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15 ) |
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16 |
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17 # unlike the other registered items, config options are neither functions or |
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18 # classes. Registering the option is just small function call. |
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19 # |
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20 # We still add the official API to the registrar module for consistency with |
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21 # the other items extensions want might to register. |
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22 configitem = configitems.getitemregister |
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23 |
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24 |
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25 class _funcregistrarbase(object): |
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26 """Base of decorator to register a function for specific purpose |
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27 |
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28 This decorator stores decorated functions into own dict 'table'. |
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29 |
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30 The least derived class can be defined by overriding 'formatdoc', |
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31 for example:: |
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32 |
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33 class keyword(_funcregistrarbase): |
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34 _docformat = ":%s: %s" |
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35 |
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36 This should be used as below: |
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37 |
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38 keyword = registrar.keyword() |
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39 |
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40 @keyword(b'bar') |
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41 def barfunc(*args, **kwargs): |
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42 '''Explanation of bar keyword .... |
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43 ''' |
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44 pass |
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45 |
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46 In this case: |
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47 |
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48 - 'barfunc' is stored as 'bar' in '_table' of an instance 'keyword' above |
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49 - 'barfunc.__doc__' becomes ":bar: Explanation of bar keyword" |
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50 """ |
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51 |
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52 def __init__(self, table=None): |
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53 if table is None: |
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54 self._table = {} |
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55 else: |
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56 self._table = table |
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57 |
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58 def __call__(self, decl, *args, **kwargs): |
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59 return lambda func: self._doregister(func, decl, *args, **kwargs) |
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60 |
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61 def _doregister(self, func, decl, *args, **kwargs): |
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62 name = self._getname(decl) |
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63 |
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64 if name in self._table: |
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65 msg = b'duplicate registration for name: "%s"' % name |
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66 raise error.ProgrammingError(msg) |
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67 |
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68 if func.__doc__ and not util.safehasattr(func, '_origdoc'): |
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69 func._origdoc = func.__doc__.strip() |
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70 doc = pycompat.sysbytes(func._origdoc) |
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71 func.__doc__ = pycompat.sysstr(self._formatdoc(decl, doc)) |
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72 |
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73 self._table[name] = func |
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74 self._extrasetup(name, func, *args, **kwargs) |
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75 |
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76 return func |
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77 |
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78 def _merge(self, registrarbase): |
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79 """Merge the entries of the given registrar object into this one. |
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80 |
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81 The other registrar object must not contain any entries already in the |
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82 current one, or a ProgrammmingError is raised. Additionally, the types |
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83 of the two registrars must match. |
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84 """ |
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85 if not isinstance(registrarbase, type(self)): |
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86 msg = b"cannot merge different types of registrar" |
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87 raise error.ProgrammingError(msg) |
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88 |
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89 dups = set(registrarbase._table).intersection(self._table) |
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90 |
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91 if dups: |
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92 msg = b'duplicate registration for names: "%s"' % b'", "'.join(dups) |
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93 raise error.ProgrammingError(msg) |
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94 |
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95 self._table.update(registrarbase._table) |
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96 |
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97 def _parsefuncdecl(self, decl): |
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98 """Parse function declaration and return the name of function in it""" |
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99 i = decl.find(b'(') |
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100 if i >= 0: |
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101 return decl[:i] |
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102 else: |
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103 return decl |
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104 |
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105 def _getname(self, decl): |
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106 """Return the name of the registered function from decl |
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107 |
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108 Derived class should override this, if it allows more |
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109 descriptive 'decl' string than just a name. |
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110 """ |
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111 return decl |
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112 |
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113 _docformat = None |
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114 |
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115 def _formatdoc(self, decl, doc): |
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116 """Return formatted document of the registered function for help |
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117 |
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118 'doc' is '__doc__.strip()' of the registered function. |
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119 """ |
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120 return self._docformat % (decl, doc) |
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121 |
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122 def _extrasetup(self, name, func): |
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123 """Execute extra setup for registered function, if needed""" |
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124 |
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125 |
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126 class command(_funcregistrarbase): |
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127 """Decorator to register a command function to table |
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128 |
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129 This class receives a command table as its argument. The table should |
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130 be a dict. |
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131 |
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132 The created object can be used as a decorator for adding commands to |
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133 that command table. This accepts multiple arguments to define a command. |
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134 |
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135 The first argument is the command name (as bytes). |
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136 |
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137 The `options` keyword argument is an iterable of tuples defining command |
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138 arguments. See ``mercurial.fancyopts.fancyopts()`` for the format of each |
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139 tuple. |
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140 |
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141 The `synopsis` argument defines a short, one line summary of how to use the |
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142 command. This shows up in the help output. |
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143 |
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144 There are three arguments that control what repository (if any) is found |
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145 and passed to the decorated function: `norepo`, `optionalrepo`, and |
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146 `inferrepo`. |
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147 |
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148 The `norepo` argument defines whether the command does not require a |
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149 local repository. Most commands operate against a repository, thus the |
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150 default is False. When True, no repository will be passed. |
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151 |
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152 The `optionalrepo` argument defines whether the command optionally requires |
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153 a local repository. If no repository can be found, None will be passed |
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154 to the decorated function. |
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155 |
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156 The `inferrepo` argument defines whether to try to find a repository from |
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157 the command line arguments. If True, arguments will be examined for |
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158 potential repository locations. See ``findrepo()``. If a repository is |
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159 found, it will be used and passed to the decorated function. |
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160 |
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161 The `intents` argument defines a set of intended actions or capabilities |
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162 the command is taking. These intents can be used to affect the construction |
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163 of the repository object passed to the command. For example, commands |
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164 declaring that they are read-only could receive a repository that doesn't |
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165 have any methods allowing repository mutation. Other intents could be used |
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166 to prevent the command from running if the requested intent could not be |
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167 fulfilled. |
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168 |
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169 If `helpcategory` is set (usually to one of the constants in the help |
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170 module), the command will be displayed under that category in the help's |
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171 list of commands. |
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172 |
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173 The following intents are defined: |
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174 |
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175 readonly |
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176 The command is read-only |
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177 |
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178 The signature of the decorated function looks like this: |
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179 def cmd(ui[, repo] [, <args>] [, <options>]) |
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180 |
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181 `repo` is required if `norepo` is False. |
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182 `<args>` are positional args (or `*args`) arguments, of non-option |
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183 arguments from the command line. |
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184 `<options>` are keyword arguments (or `**options`) of option arguments |
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185 from the command line. |
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186 |
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187 See the WritingExtensions and MercurialApi documentation for more exhaustive |
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188 descriptions and examples. |
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189 """ |
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190 |
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191 # Command categories for grouping them in help output. |
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192 # These can also be specified for aliases, like: |
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193 # [alias] |
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194 # myalias = something |
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195 # myalias:category = repo |
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196 CATEGORY_REPO_CREATION = b'repo' |
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197 CATEGORY_REMOTE_REPO_MANAGEMENT = b'remote' |
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198 CATEGORY_COMMITTING = b'commit' |
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199 CATEGORY_CHANGE_MANAGEMENT = b'management' |
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200 CATEGORY_CHANGE_ORGANIZATION = b'organization' |
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201 CATEGORY_FILE_CONTENTS = b'files' |
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202 CATEGORY_CHANGE_NAVIGATION = b'navigation' |
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203 CATEGORY_WORKING_DIRECTORY = b'wdir' |
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204 CATEGORY_IMPORT_EXPORT = b'import' |
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205 CATEGORY_MAINTENANCE = b'maintenance' |
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206 CATEGORY_HELP = b'help' |
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207 CATEGORY_MISC = b'misc' |
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208 CATEGORY_NONE = b'none' |
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209 |
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210 def _doregister( |
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211 self, |
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212 func, |
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213 name, |
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214 options=(), |
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215 synopsis=None, |
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216 norepo=False, |
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217 optionalrepo=False, |
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218 inferrepo=False, |
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219 intents=None, |
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220 helpcategory=None, |
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221 helpbasic=False, |
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222 ): |
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223 func.norepo = norepo |
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224 func.optionalrepo = optionalrepo |
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225 func.inferrepo = inferrepo |
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226 func.intents = intents or set() |
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227 func.helpcategory = helpcategory |
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228 func.helpbasic = helpbasic |
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229 if synopsis: |
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230 self._table[name] = func, list(options), synopsis |
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231 else: |
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232 self._table[name] = func, list(options) |
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233 return func |
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234 |
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235 def rename(self, old, new): |
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236 """rename a command. Used to add aliases, debugstrip -> |
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237 debugstrip|strip |
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238 """ |
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239 self._table[new] = self._table.pop(old) |
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240 |
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241 |
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242 INTENT_READONLY = b'readonly' |
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243 |
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244 |
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245 class revsetpredicate(_funcregistrarbase): |
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246 """Decorator to register revset predicate |
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247 |
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248 Usage:: |
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249 |
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250 revsetpredicate = registrar.revsetpredicate() |
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251 |
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252 @revsetpredicate(b'mypredicate(arg1, arg2[, arg3])') |
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253 def mypredicatefunc(repo, subset, x): |
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254 '''Explanation of this revset predicate .... |
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255 ''' |
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256 pass |
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257 |
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258 The first string argument is used also in online help. |
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259 |
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260 Optional argument 'safe' indicates whether a predicate is safe for |
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261 DoS attack (False by default). |
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262 |
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263 Optional argument 'takeorder' indicates whether a predicate function |
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264 takes ordering policy as the last argument. |
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265 |
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266 Optional argument 'weight' indicates the estimated run-time cost, useful |
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267 for static optimization, default is 1. Higher weight means more expensive. |
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268 Usually, revsets that are fast and return only one revision has a weight of |
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269 0.5 (ex. a symbol); revsets with O(changelog) complexity and read only the |
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270 changelog have weight 10 (ex. author); revsets reading manifest deltas have |
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271 weight 30 (ex. adds); revset reading manifest contents have weight 100 |
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272 (ex. contains). Note: those values are flexible. If the revset has a |
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273 same big-O time complexity as 'contains', but with a smaller constant, it |
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274 might have a weight of 90. |
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275 |
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276 'revsetpredicate' instance in example above can be used to |
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277 decorate multiple functions. |
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278 |
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279 Decorated functions are registered automatically at loading |
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280 extension, if an instance named as 'revsetpredicate' is used for |
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281 decorating in extension. |
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282 |
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283 Otherwise, explicit 'revset.loadpredicate()' is needed. |
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284 """ |
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285 |
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286 _getname = _funcregistrarbase._parsefuncdecl |
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287 _docformat = b"``%s``\n %s" |
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288 |
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289 def _extrasetup(self, name, func, safe=False, takeorder=False, weight=1): |
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290 func._safe = safe |
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291 func._takeorder = takeorder |
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292 func._weight = weight |
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293 |
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294 |
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295 class filesetpredicate(_funcregistrarbase): |
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296 """Decorator to register fileset predicate |
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297 |
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298 Usage:: |
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299 |
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300 filesetpredicate = registrar.filesetpredicate() |
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301 |
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302 @filesetpredicate(b'mypredicate()') |
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303 def mypredicatefunc(mctx, x): |
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304 '''Explanation of this fileset predicate .... |
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305 ''' |
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306 pass |
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307 |
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308 The first string argument is used also in online help. |
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309 |
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310 Optional argument 'callstatus' indicates whether a predicate |
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311 implies 'matchctx.status()' at runtime or not (False, by |
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312 default). |
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313 |
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314 Optional argument 'weight' indicates the estimated run-time cost, useful |
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315 for static optimization, default is 1. Higher weight means more expensive. |
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316 There are predefined weights in the 'filesetlang' module. |
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317 |
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318 ====== ============================================================= |
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319 Weight Description and examples |
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320 ====== ============================================================= |
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321 0.5 basic match patterns (e.g. a symbol) |
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322 10 computing status (e.g. added()) or accessing a few files |
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323 30 reading file content for each (e.g. grep()) |
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324 50 scanning working directory (ignored()) |
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325 ====== ============================================================= |
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326 |
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327 'filesetpredicate' instance in example above can be used to |
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328 decorate multiple functions. |
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329 |
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330 Decorated functions are registered automatically at loading |
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331 extension, if an instance named as 'filesetpredicate' is used for |
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332 decorating in extension. |
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333 |
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334 Otherwise, explicit 'fileset.loadpredicate()' is needed. |
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335 """ |
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336 |
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337 _getname = _funcregistrarbase._parsefuncdecl |
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338 _docformat = b"``%s``\n %s" |
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339 |
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340 def _extrasetup(self, name, func, callstatus=False, weight=1): |
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341 func._callstatus = callstatus |
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342 func._weight = weight |
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343 |
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344 |
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345 class _templateregistrarbase(_funcregistrarbase): |
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346 """Base of decorator to register functions as template specific one""" |
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347 |
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348 _docformat = b":%s: %s" |
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349 |
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350 |
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351 class templatekeyword(_templateregistrarbase): |
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352 """Decorator to register template keyword |
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353 |
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354 Usage:: |
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355 |
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356 templatekeyword = registrar.templatekeyword() |
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357 |
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358 # new API (since Mercurial 4.6) |
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359 @templatekeyword(b'mykeyword', requires={b'repo', b'ctx'}) |
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360 def mykeywordfunc(context, mapping): |
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361 '''Explanation of this template keyword .... |
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362 ''' |
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363 pass |
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364 |
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365 The first string argument is used also in online help. |
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366 |
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367 Optional argument 'requires' should be a collection of resource names |
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368 which the template keyword depends on. |
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369 |
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370 'templatekeyword' instance in example above can be used to |
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371 decorate multiple functions. |
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372 |
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373 Decorated functions are registered automatically at loading |
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374 extension, if an instance named as 'templatekeyword' is used for |
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375 decorating in extension. |
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376 |
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377 Otherwise, explicit 'templatekw.loadkeyword()' is needed. |
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378 """ |
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379 |
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380 def _extrasetup(self, name, func, requires=()): |
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381 func._requires = requires |
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382 |
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383 |
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384 class templatefilter(_templateregistrarbase): |
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385 """Decorator to register template filer |
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386 |
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387 Usage:: |
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388 |
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389 templatefilter = registrar.templatefilter() |
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390 |
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391 @templatefilter(b'myfilter', intype=bytes) |
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392 def myfilterfunc(text): |
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393 '''Explanation of this template filter .... |
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394 ''' |
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395 pass |
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396 |
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397 The first string argument is used also in online help. |
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398 |
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399 Optional argument 'intype' defines the type of the input argument, |
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400 which should be (bytes, int, templateutil.date, or None for any.) |
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401 |
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402 'templatefilter' instance in example above can be used to |
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403 decorate multiple functions. |
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404 |
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405 Decorated functions are registered automatically at loading |
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406 extension, if an instance named as 'templatefilter' is used for |
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407 decorating in extension. |
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408 |
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409 Otherwise, explicit 'templatefilters.loadkeyword()' is needed. |
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410 """ |
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411 |
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412 def _extrasetup(self, name, func, intype=None): |
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413 func._intype = intype |
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414 |
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415 |
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416 class templatefunc(_templateregistrarbase): |
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417 """Decorator to register template function |
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418 |
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419 Usage:: |
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420 |
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421 templatefunc = registrar.templatefunc() |
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422 |
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423 @templatefunc(b'myfunc(arg1, arg2[, arg3])', argspec=b'arg1 arg2 arg3', |
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424 requires={b'ctx'}) |
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425 def myfuncfunc(context, mapping, args): |
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426 '''Explanation of this template function .... |
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427 ''' |
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428 pass |
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429 |
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430 The first string argument is used also in online help. |
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431 |
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432 If optional 'argspec' is defined, the function will receive 'args' as |
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433 a dict of named arguments. Otherwise 'args' is a list of positional |
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434 arguments. |
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435 |
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436 Optional argument 'requires' should be a collection of resource names |
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437 which the template function depends on. |
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438 |
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439 'templatefunc' instance in example above can be used to |
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440 decorate multiple functions. |
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441 |
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442 Decorated functions are registered automatically at loading |
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443 extension, if an instance named as 'templatefunc' is used for |
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444 decorating in extension. |
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445 |
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446 Otherwise, explicit 'templatefuncs.loadfunction()' is needed. |
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447 """ |
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448 |
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449 _getname = _funcregistrarbase._parsefuncdecl |
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450 |
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451 def _extrasetup(self, name, func, argspec=None, requires=()): |
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452 func._argspec = argspec |
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453 func._requires = requires |
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454 |
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455 |
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456 class internalmerge(_funcregistrarbase): |
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457 """Decorator to register in-process merge tool |
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458 |
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459 Usage:: |
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460 |
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461 internalmerge = registrar.internalmerge() |
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462 |
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463 @internalmerge(b'mymerge', internalmerge.mergeonly, |
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464 onfailure=None, precheck=None, |
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465 binary=False, symlink=False): |
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466 def mymergefunc(repo, mynode, orig, fcd, fco, fca, |
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467 toolconf, files, labels=None): |
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468 '''Explanation of this internal merge tool .... |
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469 ''' |
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470 return 1, False # means "conflicted", "no deletion needed" |
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471 |
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472 The first string argument is used to compose actual merge tool name, |
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473 ":name" and "internal:name" (the latter is historical one). |
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474 |
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475 The second argument is one of merge types below: |
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476 |
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477 ========== ======== ======== ========= |
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478 merge type precheck premerge fullmerge |
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479 ========== ======== ======== ========= |
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480 nomerge x x x |
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481 mergeonly o x o |
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482 fullmerge o o o |
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483 ========== ======== ======== ========= |
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484 |
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485 Optional argument 'onfailure' is the format of warning message |
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486 to be used at failure of merging (target filename is specified |
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487 at formatting). Or, None or so, if warning message should be |
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488 suppressed. |
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489 |
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490 Optional argument 'precheck' is the function to be used |
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491 before actual invocation of internal merge tool itself. |
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492 It takes as same arguments as internal merge tool does, other than |
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493 'files' and 'labels'. If it returns false value, merging is aborted |
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494 immediately (and file is marked as "unresolved"). |
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495 |
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496 Optional argument 'binary' is a binary files capability of internal |
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497 merge tool. 'nomerge' merge type implies binary=True. |
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498 |
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499 Optional argument 'symlink' is a symlinks capability of inetrnal |
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500 merge function. 'nomerge' merge type implies symlink=True. |
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501 |
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502 'internalmerge' instance in example above can be used to |
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503 decorate multiple functions. |
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504 |
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505 Decorated functions are registered automatically at loading |
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506 extension, if an instance named as 'internalmerge' is used for |
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507 decorating in extension. |
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508 |
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509 Otherwise, explicit 'filemerge.loadinternalmerge()' is needed. |
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510 """ |
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511 |
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512 _docformat = b"``:%s``\n %s" |
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513 |
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514 # merge type definitions: |
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515 nomerge = None |
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516 mergeonly = b'mergeonly' # just the full merge, no premerge |
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517 fullmerge = b'fullmerge' # both premerge and merge |
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518 |
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519 def _extrasetup( |
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520 self, |
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521 name, |
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522 func, |
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523 mergetype, |
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524 onfailure=None, |
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525 precheck=None, |
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526 binary=False, |
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527 symlink=False, |
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528 ): |
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529 func.mergetype = mergetype |
50c44dee741a
filemerge: move decorator definition for internal merge tools to registrar
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
33132
diff
changeset
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530 func.onfailure = onfailure |
50c44dee741a
filemerge: move decorator definition for internal merge tools to registrar
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
33132
diff
changeset
|
531 func.precheck = precheck |
39122
5d3b58472660
filemerge: set actual capabilities of internal merge tools
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
38930
diff
changeset
|
532 |
5d3b58472660
filemerge: set actual capabilities of internal merge tools
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
38930
diff
changeset
|
533 binarycap = binary or mergetype == self.nomerge |
5d3b58472660
filemerge: set actual capabilities of internal merge tools
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
38930
diff
changeset
|
534 symlinkcap = symlink or mergetype == self.nomerge |
5d3b58472660
filemerge: set actual capabilities of internal merge tools
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
38930
diff
changeset
|
535 |
5d3b58472660
filemerge: set actual capabilities of internal merge tools
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
38930
diff
changeset
|
536 # actual capabilities, which this internal merge tool has |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
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537 func.capabilities = {b"binary": binarycap, b"symlink": symlinkcap} |