Mercurial > hg
annotate mercurial/extensions.py @ 25201:59d794154e8d
pager: drop python 2.4 hack around subprocess
Farewell, we do not need you anymore.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Mon, 18 May 2015 16:20:12 -0500 |
parents | e6e7d1cce04d |
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1 # extensions.py - extension handling for mercurial |
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2 # |
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 import imp, os |
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9 import util, cmdutil, error |
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10 from i18n import _, gettext |
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11 |
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12 _extensions = {} |
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13 _aftercallbacks = {} |
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14 _order = [] |
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15 _ignore = ['hbisect', 'bookmarks', 'parentrevspec', 'interhg', 'inotify'] |
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16 |
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17 def extensions(ui=None): |
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18 if ui: |
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19 def enabled(name): |
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20 for format in ['%s', 'hgext.%s']: |
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21 conf = ui.config('extensions', format % name) |
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22 if conf is not None and not conf.startswith('!'): |
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23 return True |
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24 else: |
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25 enabled = lambda name: True |
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26 for name in _order: |
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27 module = _extensions[name] |
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28 if module and enabled(name): |
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29 yield name, module |
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30 |
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31 def find(name): |
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32 '''return module with given extension name''' |
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33 mod = None |
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34 try: |
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35 mod = _extensions[name] |
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36 except KeyError: |
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37 for k, v in _extensions.iteritems(): |
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38 if k.endswith('.' + name) or k.endswith('/' + name): |
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39 mod = v |
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40 break |
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41 if not mod: |
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42 raise KeyError(name) |
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43 return mod |
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44 |
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45 def loadpath(path, module_name): |
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46 module_name = module_name.replace('.', '_') |
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47 path = util.normpath(util.expandpath(path)) |
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48 if os.path.isdir(path): |
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49 # module/__init__.py style |
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50 d, f = os.path.split(path) |
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51 fd, fpath, desc = imp.find_module(f, [d]) |
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52 return imp.load_module(module_name, fd, fpath, desc) |
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53 else: |
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54 try: |
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55 return imp.load_source(module_name, path) |
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56 except IOError, exc: |
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57 if not exc.filename: |
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58 exc.filename = path # python does not fill this |
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59 raise |
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60 |
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61 def load(ui, name, path): |
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62 if name.startswith('hgext.') or name.startswith('hgext/'): |
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63 shortname = name[6:] |
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64 else: |
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65 shortname = name |
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66 if shortname in _ignore: |
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67 return None |
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68 if shortname in _extensions: |
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69 return _extensions[shortname] |
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70 _extensions[shortname] = None |
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71 if path: |
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72 # the module will be loaded in sys.modules |
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73 # choose an unique name so that it doesn't |
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74 # conflicts with other modules |
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75 mod = loadpath(path, 'hgext.%s' % name) |
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76 else: |
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77 def importh(name): |
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78 mod = __import__(name) |
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79 components = name.split('.') |
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80 for comp in components[1:]: |
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81 mod = getattr(mod, comp) |
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82 return mod |
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83 try: |
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84 mod = importh("hgext.%s" % name) |
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85 except ImportError, err: |
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86 ui.debug('could not import hgext.%s (%s): trying %s\n' |
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87 % (name, err, name)) |
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88 mod = importh(name) |
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89 _extensions[shortname] = mod |
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90 _order.append(shortname) |
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91 for fn in _aftercallbacks.get(shortname, []): |
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92 fn(loaded=True) |
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93 return mod |
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94 |
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95 def loadall(ui): |
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96 result = ui.configitems("extensions") |
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97 newindex = len(_order) |
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98 for (name, path) in result: |
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99 if path: |
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100 if path[0] == '!': |
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101 continue |
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102 try: |
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103 load(ui, name, path) |
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104 except KeyboardInterrupt: |
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105 raise |
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106 except Exception, inst: |
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107 if path: |
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108 ui.warn(_("*** failed to import extension %s from %s: %s\n") |
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109 % (name, path, inst)) |
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110 else: |
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111 ui.warn(_("*** failed to import extension %s: %s\n") |
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112 % (name, inst)) |
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113 |
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114 for name in _order[newindex:]: |
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115 uisetup = getattr(_extensions[name], 'uisetup', None) |
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116 if uisetup: |
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117 uisetup(ui) |
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118 |
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119 for name in _order[newindex:]: |
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120 extsetup = getattr(_extensions[name], 'extsetup', None) |
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121 if extsetup: |
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122 try: |
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123 extsetup(ui) |
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124 except TypeError: |
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125 if extsetup.func_code.co_argcount != 0: |
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126 raise |
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127 extsetup() # old extsetup with no ui argument |
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128 |
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129 # Call aftercallbacks that were never met. |
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130 for shortname in _aftercallbacks: |
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131 if shortname in _extensions: |
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132 continue |
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133 |
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134 for fn in _aftercallbacks[shortname]: |
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135 fn(loaded=False) |
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136 |
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137 # loadall() is called multiple times and lingering _aftercallbacks |
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138 # entries could result in double execution. See issue4646. |
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139 _aftercallbacks.clear() |
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140 |
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141 def afterloaded(extension, callback): |
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142 '''Run the specified function after a named extension is loaded. |
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143 |
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144 If the named extension is already loaded, the callback will be called |
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145 immediately. |
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146 |
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147 If the named extension never loads, the callback will be called after |
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148 all extensions have been loaded. |
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149 |
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150 The callback receives the named argument ``loaded``, which is a boolean |
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151 indicating whether the dependent extension actually loaded. |
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152 ''' |
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153 |
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154 if extension in _extensions: |
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155 callback(loaded=True) |
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156 else: |
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157 _aftercallbacks.setdefault(extension, []).append(callback) |
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158 |
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159 def bind(func, *args): |
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160 '''Partial function application |
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161 |
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162 Returns a new function that is the partial application of args and kwargs |
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163 to func. For example, |
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164 |
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165 f(1, 2, bar=3) === bind(f, 1)(2, bar=3)''' |
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166 assert callable(func) |
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167 def closure(*a, **kw): |
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168 return func(*(args + a), **kw) |
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169 return closure |
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170 |
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171 def wrapcommand(table, command, wrapper, synopsis=None, docstring=None): |
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172 '''Wrap the command named `command' in table |
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173 |
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174 Replace command in the command table with wrapper. The wrapped command will |
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175 be inserted into the command table specified by the table argument. |
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176 |
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177 The wrapper will be called like |
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178 |
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179 wrapper(orig, *args, **kwargs) |
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180 |
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181 where orig is the original (wrapped) function, and *args, **kwargs |
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182 are the arguments passed to it. |
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183 |
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184 Optionally append to the command synopsis and docstring, used for help. |
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185 For example, if your extension wraps the ``bookmarks`` command to add the |
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186 flags ``--remote`` and ``--all`` you might call this function like so: |
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187 |
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188 synopsis = ' [-a] [--remote]' |
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189 docstring = """ |
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190 |
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191 The ``remotenames`` extension adds the ``--remote`` and ``--all`` (``-a``) |
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192 flags to the bookmarks command. Either flag will show the remote bookmarks |
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193 known to the repository; ``--remote`` will also supress the output of the |
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194 local bookmarks. |
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195 """ |
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196 |
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197 extensions.wrapcommand(commands.table, 'bookmarks', exbookmarks, |
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198 synopsis, docstring) |
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199 ''' |
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200 assert callable(wrapper) |
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201 aliases, entry = cmdutil.findcmd(command, table) |
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202 for alias, e in table.iteritems(): |
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203 if e is entry: |
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204 key = alias |
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205 break |
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206 |
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207 origfn = entry[0] |
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208 wrap = bind(util.checksignature(wrapper), util.checksignature(origfn)) |
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209 |
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210 wrap.__module__ = getattr(origfn, '__module__') |
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211 |
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212 doc = getattr(origfn, '__doc__') |
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213 if docstring is not None: |
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214 doc += docstring |
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215 wrap.__doc__ = doc |
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216 |
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217 newentry = list(entry) |
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218 newentry[0] = wrap |
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219 if synopsis is not None: |
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220 newentry[2] += synopsis |
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221 table[key] = tuple(newentry) |
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222 return entry |
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223 |
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224 def wrapfunction(container, funcname, wrapper): |
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225 '''Wrap the function named funcname in container |
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226 |
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227 Replace the funcname member in the given container with the specified |
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228 wrapper. The container is typically a module, class, or instance. |
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229 |
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230 The wrapper will be called like |
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231 |
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232 wrapper(orig, *args, **kwargs) |
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233 |
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234 where orig is the original (wrapped) function, and *args, **kwargs |
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235 are the arguments passed to it. |
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236 |
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237 Wrapping methods of the repository object is not recommended since |
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238 it conflicts with extensions that extend the repository by |
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239 subclassing. All extensions that need to extend methods of |
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240 localrepository should use this subclassing trick: namely, |
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241 reposetup() should look like |
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242 |
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243 def reposetup(ui, repo): |
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244 class myrepo(repo.__class__): |
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245 def whatever(self, *args, **kwargs): |
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246 [...extension stuff...] |
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247 super(myrepo, self).whatever(*args, **kwargs) |
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248 [...extension stuff...] |
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249 |
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250 repo.__class__ = myrepo |
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251 |
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252 In general, combining wrapfunction() with subclassing does not |
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253 work. Since you cannot control what other extensions are loaded by |
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254 your end users, you should play nicely with others by using the |
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255 subclass trick. |
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256 ''' |
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257 assert callable(wrapper) |
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258 |
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259 origfn = getattr(container, funcname) |
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260 assert callable(origfn) |
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261 setattr(container, funcname, bind(wrapper, origfn)) |
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262 return origfn |
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263 |
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264 def _disabledpaths(strip_init=False): |
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265 '''find paths of disabled extensions. returns a dict of {name: path} |
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266 removes /__init__.py from packages if strip_init is True''' |
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267 import hgext |
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268 extpath = os.path.dirname(os.path.abspath(hgext.__file__)) |
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269 try: # might not be a filesystem path |
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270 files = os.listdir(extpath) |
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271 except OSError: |
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272 return {} |
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273 |
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274 exts = {} |
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275 for e in files: |
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276 if e.endswith('.py'): |
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277 name = e.rsplit('.', 1)[0] |
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278 path = os.path.join(extpath, e) |
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279 else: |
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280 name = e |
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281 path = os.path.join(extpath, e, '__init__.py') |
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282 if not os.path.exists(path): |
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283 continue |
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284 if strip_init: |
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285 path = os.path.dirname(path) |
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286 if name in exts or name in _order or name == '__init__': |
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287 continue |
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288 exts[name] = path |
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289 return exts |
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290 |
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291 def _moduledoc(file): |
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292 '''return the top-level python documentation for the given file |
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293 |
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294 Loosely inspired by pydoc.source_synopsis(), but rewritten to |
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295 handle triple quotes and to return the whole text instead of just |
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296 the synopsis''' |
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297 result = [] |
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298 |
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299 line = file.readline() |
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300 while line[:1] == '#' or not line.strip(): |
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301 line = file.readline() |
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302 if not line: |
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303 break |
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304 |
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305 start = line[:3] |
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306 if start == '"""' or start == "'''": |
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307 line = line[3:] |
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308 while line: |
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309 if line.rstrip().endswith(start): |
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310 line = line.split(start)[0] |
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311 if line: |
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312 result.append(line) |
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313 break |
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314 elif not line: |
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315 return None # unmatched delimiter |
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316 result.append(line) |
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317 line = file.readline() |
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318 else: |
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319 return None |
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320 |
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321 return ''.join(result) |
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322 |
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323 def _disabledhelp(path): |
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324 '''retrieve help synopsis of a disabled extension (without importing)''' |
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325 try: |
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326 file = open(path) |
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327 except IOError: |
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328 return |
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329 else: |
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330 doc = _moduledoc(file) |
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331 file.close() |
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332 |
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333 if doc: # extracting localized synopsis |
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334 return gettext(doc).splitlines()[0] |
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335 else: |
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336 return _('(no help text available)') |
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337 |
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338 def disabled(): |
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339 '''find disabled extensions from hgext. returns a dict of {name: desc}''' |
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340 try: |
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341 from hgext import __index__ |
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342 return dict((name, gettext(desc)) |
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343 for name, desc in __index__.docs.iteritems() |
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344 if name not in _order) |
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345 except (ImportError, AttributeError): |
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346 pass |
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347 |
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348 paths = _disabledpaths() |
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349 if not paths: |
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350 return {} |
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351 |
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352 exts = {} |
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353 for name, path in paths.iteritems(): |
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354 doc = _disabledhelp(path) |
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355 if doc: |
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356 exts[name] = doc |
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357 |
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358 return exts |
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359 |
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360 def disabledext(name): |
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361 '''find a specific disabled extension from hgext. returns desc''' |
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362 try: |
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363 from hgext import __index__ |
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364 if name in _order: # enabled |
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365 return |
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366 else: |
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367 return gettext(__index__.docs.get(name)) |
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368 except (ImportError, AttributeError): |
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369 pass |
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370 |
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371 paths = _disabledpaths() |
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372 if name in paths: |
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373 return _disabledhelp(paths[name]) |
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374 |
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375 def disabledcmd(ui, cmd, strict=False): |
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376 '''import disabled extensions until cmd is found. |
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377 returns (cmdname, extname, module)''' |
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378 |
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379 paths = _disabledpaths(strip_init=True) |
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380 if not paths: |
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381 raise error.UnknownCommand(cmd) |
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382 |
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383 def findcmd(cmd, name, path): |
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384 try: |
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385 mod = loadpath(path, 'hgext.%s' % name) |
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386 except Exception: |
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387 return |
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388 try: |
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389 aliases, entry = cmdutil.findcmd(cmd, |
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390 getattr(mod, 'cmdtable', {}), strict) |
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391 except (error.AmbiguousCommand, error.UnknownCommand): |
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392 return |
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393 except Exception: |
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394 ui.warn(_('warning: error finding commands in %s\n') % path) |
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395 ui.traceback() |
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396 return |
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397 for c in aliases: |
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398 if c.startswith(cmd): |
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399 cmd = c |
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400 break |
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401 else: |
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402 cmd = aliases[0] |
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403 return (cmd, name, mod) |
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404 |
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405 ext = None |
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406 # first, search for an extension with the same name as the command |
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407 path = paths.pop(cmd, None) |
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408 if path: |
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409 ext = findcmd(cmd, cmd, path) |
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410 if not ext: |
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411 # otherwise, interrogate each extension until there's a match |
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412 for name, path in paths.iteritems(): |
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413 ext = findcmd(cmd, name, path) |
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414 if ext: |
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415 break |
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416 if ext and 'DEPRECATED' not in ext.__doc__: |
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417 return ext |
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418 |
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419 raise error.UnknownCommand(cmd) |
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420 |
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421 def enabled(shortname=True): |
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422 '''return a dict of {name: desc} of extensions''' |
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423 exts = {} |
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424 for ename, ext in extensions(): |
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425 doc = (gettext(ext.__doc__) or _('(no help text available)')) |
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426 if shortname: |
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427 ename = ename.split('.')[-1] |
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428 exts[ename] = doc.splitlines()[0].strip() |
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429 |
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430 return exts |
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431 |
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432 def moduleversion(module): |
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433 '''return version information from given module as a string''' |
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434 if (util.safehasattr(module, 'getversion') |
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435 and callable(module.getversion)): |
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436 version = module.getversion() |
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437 elif util.safehasattr(module, '__version__'): |
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438 version = module.__version__ |
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439 else: |
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440 version = '' |
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441 if isinstance(version, (list, tuple)): |
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442 version = '.'.join(str(o) for o in version) |
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443 return version |