Mercurial > hg
annotate mercurial/extensions.py @ 24145:28af978c8f13
extensions: indicate loaded for an immediately called afterload callback
Otherwise, there's no way to tell between the immediate callback when it is
already loaded, and when the extension is not loaded at all.
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Sat, 21 Feb 2015 00:40:18 -0500 |
parents | 042d95beeee8 |
children | fb6cb1b82f4f |
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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 def afterloaded(extension, callback): |
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138 '''Run the specified function after a named extension is loaded. |
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139 |
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140 If the named extension is already loaded, the callback will be called |
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141 immediately. |
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142 |
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143 If the named extension never loads, the callback will be called after |
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144 all extensions have been loaded. |
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145 |
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146 The callback receives the named argument ``loaded``, which is a boolean |
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147 indicating whether the dependent extension actually loaded. |
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148 ''' |
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149 |
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150 if extension in _extensions: |
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151 callback(loaded=True) |
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152 else: |
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153 _aftercallbacks.setdefault(extension, []).append(callback) |
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154 |
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155 def wrapcommand(table, command, wrapper, synopsis=None, docstring=None): |
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156 '''Wrap the command named `command' in table |
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157 |
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158 Replace command in the command table with wrapper. The wrapped command will |
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159 be inserted into the command table specified by the table argument. |
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160 |
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161 The wrapper will be called like |
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162 |
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163 wrapper(orig, *args, **kwargs) |
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164 |
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165 where orig is the original (wrapped) function, and *args, **kwargs |
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166 are the arguments passed to it. |
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167 |
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168 Optionally append to the command synopsis and docstring, used for help. |
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169 For example, if your extension wraps the ``bookmarks`` command to add the |
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170 flags ``--remote`` and ``--all`` you might call this function like so: |
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171 |
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172 synopsis = ' [-a] [--remote]' |
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173 docstring = """ |
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174 |
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175 The ``remotenames`` extension adds the ``--remote`` and ``--all`` (``-a``) |
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176 flags to the bookmarks command. Either flag will show the remote bookmarks |
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177 known to the repository; ``--remote`` will also supress the output of the |
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178 local bookmarks. |
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179 """ |
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180 |
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181 extensions.wrapcommand(commands.table, 'bookmarks', exbookmarks, |
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182 synopsis, docstring) |
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183 ''' |
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184 assert callable(wrapper) |
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185 aliases, entry = cmdutil.findcmd(command, table) |
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186 for alias, e in table.iteritems(): |
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187 if e is entry: |
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188 key = alias |
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189 break |
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190 |
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191 origfn = entry[0] |
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192 def wrap(*args, **kwargs): |
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193 return util.checksignature(wrapper)( |
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194 util.checksignature(origfn), *args, **kwargs) |
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195 |
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196 wrap.__module__ = getattr(origfn, '__module__') |
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197 |
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198 doc = getattr(origfn, '__doc__') |
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199 if docstring is not None: |
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200 doc += docstring |
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201 wrap.__doc__ = doc |
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202 |
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203 newentry = list(entry) |
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204 newentry[0] = wrap |
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205 if synopsis is not None: |
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206 newentry[2] += synopsis |
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207 table[key] = tuple(newentry) |
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208 return entry |
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209 |
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210 def wrapfunction(container, funcname, wrapper): |
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211 '''Wrap the function named funcname in container |
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212 |
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213 Replace the funcname member in the given container with the specified |
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214 wrapper. The container is typically a module, class, or instance. |
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215 |
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216 The wrapper will be called like |
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217 |
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218 wrapper(orig, *args, **kwargs) |
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219 |
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220 where orig is the original (wrapped) function, and *args, **kwargs |
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221 are the arguments passed to it. |
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222 |
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223 Wrapping methods of the repository object is not recommended since |
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224 it conflicts with extensions that extend the repository by |
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225 subclassing. All extensions that need to extend methods of |
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226 localrepository should use this subclassing trick: namely, |
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227 reposetup() should look like |
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228 |
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229 def reposetup(ui, repo): |
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230 class myrepo(repo.__class__): |
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231 def whatever(self, *args, **kwargs): |
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232 [...extension stuff...] |
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233 super(myrepo, self).whatever(*args, **kwargs) |
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234 [...extension stuff...] |
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235 |
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236 repo.__class__ = myrepo |
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237 |
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238 In general, combining wrapfunction() with subclassing does not |
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239 work. Since you cannot control what other extensions are loaded by |
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240 your end users, you should play nicely with others by using the |
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241 subclass trick. |
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242 ''' |
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243 assert callable(wrapper) |
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244 def wrap(*args, **kwargs): |
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245 return wrapper(origfn, *args, **kwargs) |
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246 |
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247 origfn = getattr(container, funcname) |
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248 assert callable(origfn) |
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249 setattr(container, funcname, wrap) |
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250 return origfn |
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251 |
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252 def _disabledpaths(strip_init=False): |
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253 '''find paths of disabled extensions. returns a dict of {name: path} |
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254 removes /__init__.py from packages if strip_init is True''' |
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255 import hgext |
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256 extpath = os.path.dirname(os.path.abspath(hgext.__file__)) |
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257 try: # might not be a filesystem path |
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258 files = os.listdir(extpath) |
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259 except OSError: |
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260 return {} |
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261 |
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262 exts = {} |
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263 for e in files: |
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264 if e.endswith('.py'): |
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265 name = e.rsplit('.', 1)[0] |
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266 path = os.path.join(extpath, e) |
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267 else: |
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268 name = e |
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269 path = os.path.join(extpath, e, '__init__.py') |
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270 if not os.path.exists(path): |
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271 continue |
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272 if strip_init: |
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273 path = os.path.dirname(path) |
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274 if name in exts or name in _order or name == '__init__': |
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275 continue |
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276 exts[name] = path |
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277 return exts |
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278 |
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279 def _moduledoc(file): |
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280 '''return the top-level python documentation for the given file |
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281 |
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282 Loosely inspired by pydoc.source_synopsis(), but rewritten to |
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283 handle triple quotes and to return the whole text instead of just |
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284 the synopsis''' |
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285 result = [] |
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286 |
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287 line = file.readline() |
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288 while line[:1] == '#' or not line.strip(): |
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289 line = file.readline() |
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290 if not line: |
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291 break |
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292 |
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293 start = line[:3] |
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294 if start == '"""' or start == "'''": |
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295 line = line[3:] |
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296 while line: |
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297 if line.rstrip().endswith(start): |
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298 line = line.split(start)[0] |
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299 if line: |
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300 result.append(line) |
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301 break |
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302 elif not line: |
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303 return None # unmatched delimiter |
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304 result.append(line) |
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305 line = file.readline() |
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306 else: |
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307 return None |
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308 |
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309 return ''.join(result) |
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310 |
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311 def _disabledhelp(path): |
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312 '''retrieve help synopsis of a disabled extension (without importing)''' |
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313 try: |
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314 file = open(path) |
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315 except IOError: |
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316 return |
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317 else: |
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318 doc = _moduledoc(file) |
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319 file.close() |
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320 |
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321 if doc: # extracting localized synopsis |
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322 return gettext(doc).splitlines()[0] |
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323 else: |
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324 return _('(no help text available)') |
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325 |
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326 def disabled(): |
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327 '''find disabled extensions from hgext. returns a dict of {name: desc}''' |
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328 try: |
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329 from hgext import __index__ |
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330 return dict((name, gettext(desc)) |
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331 for name, desc in __index__.docs.iteritems() |
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332 if name not in _order) |
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333 except (ImportError, AttributeError): |
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334 pass |
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335 |
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336 paths = _disabledpaths() |
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337 if not paths: |
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338 return {} |
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339 |
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340 exts = {} |
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341 for name, path in paths.iteritems(): |
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342 doc = _disabledhelp(path) |
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343 if doc: |
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344 exts[name] = doc |
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345 |
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346 return exts |
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347 |
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348 def disabledext(name): |
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349 '''find a specific disabled extension from hgext. returns desc''' |
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350 try: |
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351 from hgext import __index__ |
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352 if name in _order: # enabled |
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353 return |
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354 else: |
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355 return gettext(__index__.docs.get(name)) |
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356 except (ImportError, AttributeError): |
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357 pass |
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358 |
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359 paths = _disabledpaths() |
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360 if name in paths: |
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361 return _disabledhelp(paths[name]) |
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362 |
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363 def disabledcmd(ui, cmd, strict=False): |
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364 '''import disabled extensions until cmd is found. |
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365 returns (cmdname, extname, module)''' |
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366 |
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367 paths = _disabledpaths(strip_init=True) |
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368 if not paths: |
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369 raise error.UnknownCommand(cmd) |
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370 |
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371 def findcmd(cmd, name, path): |
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372 try: |
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373 mod = loadpath(path, 'hgext.%s' % name) |
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374 except Exception: |
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375 return |
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376 try: |
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377 aliases, entry = cmdutil.findcmd(cmd, |
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378 getattr(mod, 'cmdtable', {}), strict) |
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379 except (error.AmbiguousCommand, error.UnknownCommand): |
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380 return |
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381 except Exception: |
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382 ui.warn(_('warning: error finding commands in %s\n') % path) |
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383 ui.traceback() |
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384 return |
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385 for c in aliases: |
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386 if c.startswith(cmd): |
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387 cmd = c |
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388 break |
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389 else: |
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390 cmd = aliases[0] |
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391 return (cmd, name, mod) |
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392 |
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393 ext = None |
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394 # first, search for an extension with the same name as the command |
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395 path = paths.pop(cmd, None) |
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396 if path: |
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397 ext = findcmd(cmd, cmd, path) |
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398 if not ext: |
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399 # otherwise, interrogate each extension until there's a match |
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400 for name, path in paths.iteritems(): |
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401 ext = findcmd(cmd, name, path) |
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402 if ext: |
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403 break |
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404 if ext and 'DEPRECATED' not in ext.__doc__: |
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405 return ext |
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406 |
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407 raise error.UnknownCommand(cmd) |
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408 |
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409 def enabled(shortname=True): |
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410 '''return a dict of {name: desc} of extensions''' |
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411 exts = {} |
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412 for ename, ext in extensions(): |
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413 doc = (gettext(ext.__doc__) or _('(no help text available)')) |
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414 if shortname: |
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415 ename = ename.split('.')[-1] |
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416 exts[ename] = doc.splitlines()[0].strip() |
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417 |
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418 return exts |
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419 |
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420 def moduleversion(module): |
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421 '''return version information from given module as a string''' |
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422 if (util.safehasattr(module, 'getversion') |
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423 and callable(module.getversion)): |
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424 version = module.getversion() |
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425 elif util.safehasattr(module, '__version__'): |
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426 version = module.__version__ |
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427 else: |
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428 version = '' |
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429 if isinstance(version, (list, tuple)): |
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430 version = '.'.join(str(o) for o in version) |
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431 return version |