Mercurial > hg
annotate mercurial/extensions.py @ 25364:de23a552fc23
extensions: show traceback on load failure if --traceback flag is set
Before this patch, there was no handy way to investigate the reason why
extension couldn't be loaded.
If ui.debug is set, tracebacks of both "hgext.foo" and "foo" are displayed
because the first ImportError could occur at very deep dependency module.
author | Yuya Nishihara <yuya@tcha.org> |
---|---|
date | Mon, 30 Mar 2015 16:23:35 +0900 |
parents | e6e7d1cce04d |
children | 328739ea70c3 |
rev | line source |
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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 if ui.debugflag: |
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89 ui.traceback() |
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90 mod = importh(name) |
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91 _extensions[shortname] = mod |
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92 _order.append(shortname) |
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93 for fn in _aftercallbacks.get(shortname, []): |
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94 fn(loaded=True) |
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95 return mod |
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96 |
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97 def loadall(ui): |
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98 result = ui.configitems("extensions") |
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99 newindex = len(_order) |
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100 for (name, path) in result: |
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101 if path: |
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102 if path[0] == '!': |
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103 continue |
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104 try: |
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105 load(ui, name, path) |
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106 except KeyboardInterrupt: |
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107 raise |
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108 except Exception, inst: |
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109 if path: |
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110 ui.warn(_("*** failed to import extension %s from %s: %s\n") |
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111 % (name, path, inst)) |
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112 else: |
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113 ui.warn(_("*** failed to import extension %s: %s\n") |
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114 % (name, inst)) |
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115 ui.traceback() |
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116 |
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117 for name in _order[newindex:]: |
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118 uisetup = getattr(_extensions[name], 'uisetup', None) |
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119 if uisetup: |
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120 uisetup(ui) |
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121 |
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122 for name in _order[newindex:]: |
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123 extsetup = getattr(_extensions[name], 'extsetup', None) |
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124 if extsetup: |
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125 try: |
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126 extsetup(ui) |
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127 except TypeError: |
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128 if extsetup.func_code.co_argcount != 0: |
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129 raise |
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130 extsetup() # old extsetup with no ui argument |
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131 |
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132 # Call aftercallbacks that were never met. |
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133 for shortname in _aftercallbacks: |
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134 if shortname in _extensions: |
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135 continue |
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136 |
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137 for fn in _aftercallbacks[shortname]: |
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138 fn(loaded=False) |
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139 |
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140 # loadall() is called multiple times and lingering _aftercallbacks |
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141 # entries could result in double execution. See issue4646. |
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142 _aftercallbacks.clear() |
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143 |
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144 def afterloaded(extension, callback): |
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145 '''Run the specified function after a named extension is loaded. |
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146 |
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147 If the named extension is already loaded, the callback will be called |
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148 immediately. |
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149 |
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150 If the named extension never loads, the callback will be called after |
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151 all extensions have been loaded. |
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152 |
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153 The callback receives the named argument ``loaded``, which is a boolean |
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154 indicating whether the dependent extension actually loaded. |
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155 ''' |
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156 |
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157 if extension in _extensions: |
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158 callback(loaded=True) |
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159 else: |
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160 _aftercallbacks.setdefault(extension, []).append(callback) |
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161 |
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162 def bind(func, *args): |
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163 '''Partial function application |
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164 |
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165 Returns a new function that is the partial application of args and kwargs |
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166 to func. For example, |
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167 |
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168 f(1, 2, bar=3) === bind(f, 1)(2, bar=3)''' |
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169 assert callable(func) |
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170 def closure(*a, **kw): |
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171 return func(*(args + a), **kw) |
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172 return closure |
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173 |
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174 def wrapcommand(table, command, wrapper, synopsis=None, docstring=None): |
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175 '''Wrap the command named `command' in table |
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176 |
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177 Replace command in the command table with wrapper. The wrapped command will |
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178 be inserted into the command table specified by the table argument. |
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179 |
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180 The wrapper will be called like |
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181 |
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182 wrapper(orig, *args, **kwargs) |
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183 |
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184 where orig is the original (wrapped) function, and *args, **kwargs |
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185 are the arguments passed to it. |
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186 |
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187 Optionally append to the command synopsis and docstring, used for help. |
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188 For example, if your extension wraps the ``bookmarks`` command to add the |
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189 flags ``--remote`` and ``--all`` you might call this function like so: |
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190 |
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191 synopsis = ' [-a] [--remote]' |
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192 docstring = """ |
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193 |
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194 The ``remotenames`` extension adds the ``--remote`` and ``--all`` (``-a``) |
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195 flags to the bookmarks command. Either flag will show the remote bookmarks |
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196 known to the repository; ``--remote`` will also supress the output of the |
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197 local bookmarks. |
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198 """ |
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199 |
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200 extensions.wrapcommand(commands.table, 'bookmarks', exbookmarks, |
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201 synopsis, docstring) |
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202 ''' |
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203 assert callable(wrapper) |
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204 aliases, entry = cmdutil.findcmd(command, table) |
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205 for alias, e in table.iteritems(): |
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206 if e is entry: |
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207 key = alias |
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208 break |
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209 |
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210 origfn = entry[0] |
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211 wrap = bind(util.checksignature(wrapper), util.checksignature(origfn)) |
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212 |
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213 wrap.__module__ = getattr(origfn, '__module__') |
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214 |
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215 doc = getattr(origfn, '__doc__') |
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216 if docstring is not None: |
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217 doc += docstring |
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218 wrap.__doc__ = doc |
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219 |
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220 newentry = list(entry) |
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221 newentry[0] = wrap |
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222 if synopsis is not None: |
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223 newentry[2] += synopsis |
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224 table[key] = tuple(newentry) |
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225 return entry |
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226 |
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227 def wrapfunction(container, funcname, wrapper): |
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228 '''Wrap the function named funcname in container |
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229 |
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230 Replace the funcname member in the given container with the specified |
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231 wrapper. The container is typically a module, class, or instance. |
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232 |
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233 The wrapper will be called like |
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234 |
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235 wrapper(orig, *args, **kwargs) |
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236 |
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237 where orig is the original (wrapped) function, and *args, **kwargs |
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238 are the arguments passed to it. |
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239 |
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240 Wrapping methods of the repository object is not recommended since |
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241 it conflicts with extensions that extend the repository by |
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242 subclassing. All extensions that need to extend methods of |
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243 localrepository should use this subclassing trick: namely, |
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244 reposetup() should look like |
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245 |
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246 def reposetup(ui, repo): |
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247 class myrepo(repo.__class__): |
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248 def whatever(self, *args, **kwargs): |
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249 [...extension stuff...] |
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250 super(myrepo, self).whatever(*args, **kwargs) |
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251 [...extension stuff...] |
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252 |
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253 repo.__class__ = myrepo |
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254 |
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255 In general, combining wrapfunction() with subclassing does not |
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256 work. Since you cannot control what other extensions are loaded by |
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257 your end users, you should play nicely with others by using the |
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258 subclass trick. |
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259 ''' |
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260 assert callable(wrapper) |
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261 |
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262 origfn = getattr(container, funcname) |
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263 assert callable(origfn) |
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264 setattr(container, funcname, bind(wrapper, origfn)) |
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265 return origfn |
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266 |
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267 def _disabledpaths(strip_init=False): |
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268 '''find paths of disabled extensions. returns a dict of {name: path} |
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269 removes /__init__.py from packages if strip_init is True''' |
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270 import hgext |
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271 extpath = os.path.dirname(os.path.abspath(hgext.__file__)) |
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272 try: # might not be a filesystem path |
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273 files = os.listdir(extpath) |
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274 except OSError: |
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275 return {} |
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276 |
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277 exts = {} |
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278 for e in files: |
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279 if e.endswith('.py'): |
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280 name = e.rsplit('.', 1)[0] |
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281 path = os.path.join(extpath, e) |
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282 else: |
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283 name = e |
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284 path = os.path.join(extpath, e, '__init__.py') |
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285 if not os.path.exists(path): |
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286 continue |
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287 if strip_init: |
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288 path = os.path.dirname(path) |
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289 if name in exts or name in _order or name == '__init__': |
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290 continue |
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291 exts[name] = path |
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292 return exts |
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293 |
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294 def _moduledoc(file): |
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295 '''return the top-level python documentation for the given file |
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296 |
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297 Loosely inspired by pydoc.source_synopsis(), but rewritten to |
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298 handle triple quotes and to return the whole text instead of just |
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299 the synopsis''' |
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300 result = [] |
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301 |
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302 line = file.readline() |
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303 while line[:1] == '#' or not line.strip(): |
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304 line = file.readline() |
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305 if not line: |
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306 break |
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307 |
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308 start = line[:3] |
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309 if start == '"""' or start == "'''": |
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310 line = line[3:] |
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311 while line: |
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312 if line.rstrip().endswith(start): |
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313 line = line.split(start)[0] |
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314 if line: |
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315 result.append(line) |
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316 break |
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317 elif not line: |
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318 return None # unmatched delimiter |
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319 result.append(line) |
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320 line = file.readline() |
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321 else: |
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322 return None |
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323 |
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324 return ''.join(result) |
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325 |
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326 def _disabledhelp(path): |
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327 '''retrieve help synopsis of a disabled extension (without importing)''' |
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328 try: |
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329 file = open(path) |
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330 except IOError: |
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331 return |
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332 else: |
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333 doc = _moduledoc(file) |
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334 file.close() |
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335 |
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336 if doc: # extracting localized synopsis |
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337 return gettext(doc).splitlines()[0] |
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338 else: |
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339 return _('(no help text available)') |
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340 |
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341 def disabled(): |
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342 '''find disabled extensions from hgext. returns a dict of {name: desc}''' |
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343 try: |
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344 from hgext import __index__ |
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345 return dict((name, gettext(desc)) |
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346 for name, desc in __index__.docs.iteritems() |
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347 if name not in _order) |
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348 except (ImportError, AttributeError): |
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349 pass |
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350 |
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351 paths = _disabledpaths() |
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352 if not paths: |
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353 return {} |
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354 |
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355 exts = {} |
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356 for name, path in paths.iteritems(): |
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357 doc = _disabledhelp(path) |
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358 if doc: |
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359 exts[name] = doc |
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360 |
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361 return exts |
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362 |
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363 def disabledext(name): |
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364 '''find a specific disabled extension from hgext. returns desc''' |
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365 try: |
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366 from hgext import __index__ |
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367 if name in _order: # enabled |
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368 return |
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369 else: |
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370 return gettext(__index__.docs.get(name)) |
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371 except (ImportError, AttributeError): |
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372 pass |
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373 |
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374 paths = _disabledpaths() |
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375 if name in paths: |
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376 return _disabledhelp(paths[name]) |
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377 |
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378 def disabledcmd(ui, cmd, strict=False): |
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379 '''import disabled extensions until cmd is found. |
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380 returns (cmdname, extname, module)''' |
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381 |
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382 paths = _disabledpaths(strip_init=True) |
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383 if not paths: |
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384 raise error.UnknownCommand(cmd) |
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385 |
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386 def findcmd(cmd, name, path): |
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387 try: |
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388 mod = loadpath(path, 'hgext.%s' % name) |
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389 except Exception: |
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390 return |
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391 try: |
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392 aliases, entry = cmdutil.findcmd(cmd, |
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393 getattr(mod, 'cmdtable', {}), strict) |
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394 except (error.AmbiguousCommand, error.UnknownCommand): |
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395 return |
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396 except Exception: |
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397 ui.warn(_('warning: error finding commands in %s\n') % path) |
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398 ui.traceback() |
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399 return |
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400 for c in aliases: |
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401 if c.startswith(cmd): |
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402 cmd = c |
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403 break |
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404 else: |
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405 cmd = aliases[0] |
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406 return (cmd, name, mod) |
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407 |
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408 ext = None |
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409 # first, search for an extension with the same name as the command |
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410 path = paths.pop(cmd, None) |
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411 if path: |
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412 ext = findcmd(cmd, cmd, path) |
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413 if not ext: |
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414 # otherwise, interrogate each extension until there's a match |
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415 for name, path in paths.iteritems(): |
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416 ext = findcmd(cmd, name, path) |
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417 if ext: |
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418 break |
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419 if ext and 'DEPRECATED' not in ext.__doc__: |
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420 return ext |
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421 |
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422 raise error.UnknownCommand(cmd) |
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423 |
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424 def enabled(shortname=True): |
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425 '''return a dict of {name: desc} of extensions''' |
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426 exts = {} |
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427 for ename, ext in extensions(): |
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428 doc = (gettext(ext.__doc__) or _('(no help text available)')) |
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429 if shortname: |
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430 ename = ename.split('.')[-1] |
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431 exts[ename] = doc.splitlines()[0].strip() |
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432 |
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433 return exts |
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434 |
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435 def moduleversion(module): |
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436 '''return version information from given module as a string''' |
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437 if (util.safehasattr(module, 'getversion') |
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438 and callable(module.getversion)): |
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439 version = module.getversion() |
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440 elif util.safehasattr(module, '__version__'): |
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441 version = module.__version__ |
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442 else: |
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443 version = '' |
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444 if isinstance(version, (list, tuple)): |
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445 version = '.'.join(str(o) for o in version) |
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446 return version |