Mercurial > hg
annotate mercurial/extensions.py @ 27637:b502138f5faa
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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 from __future__ import absolute_import |
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9 |
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10 import imp |
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11 import os |
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12 |
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13 from .i18n import ( |
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14 _, |
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15 gettext, |
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16 ) |
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17 |
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18 from . import ( |
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19 cmdutil, |
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20 error, |
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21 util, |
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22 ) |
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23 |
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24 _extensions = {} |
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25 _aftercallbacks = {} |
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26 _order = [] |
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27 _builtin = set(['hbisect', 'bookmarks', 'parentrevspec', 'progress', 'interhg', |
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28 'inotify']) |
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29 |
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30 def extensions(ui=None): |
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31 if ui: |
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32 def enabled(name): |
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33 for format in ['%s', 'hgext.%s']: |
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34 conf = ui.config('extensions', format % name) |
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35 if conf is not None and not conf.startswith('!'): |
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36 return True |
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37 else: |
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38 enabled = lambda name: True |
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39 for name in _order: |
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40 module = _extensions[name] |
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41 if module and enabled(name): |
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42 yield name, module |
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43 |
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44 def find(name): |
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45 '''return module with given extension name''' |
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46 mod = None |
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47 try: |
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48 mod = _extensions[name] |
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49 except KeyError: |
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50 for k, v in _extensions.iteritems(): |
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51 if k.endswith('.' + name) or k.endswith('/' + name): |
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52 mod = v |
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53 break |
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54 if not mod: |
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55 raise KeyError(name) |
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56 return mod |
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57 |
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58 def loadpath(path, module_name): |
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59 module_name = module_name.replace('.', '_') |
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60 path = util.normpath(util.expandpath(path)) |
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61 if os.path.isdir(path): |
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62 # module/__init__.py style |
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63 d, f = os.path.split(path) |
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64 fd, fpath, desc = imp.find_module(f, [d]) |
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65 return imp.load_module(module_name, fd, fpath, desc) |
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66 else: |
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67 try: |
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68 return imp.load_source(module_name, path) |
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69 except IOError as exc: |
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70 if not exc.filename: |
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71 exc.filename = path # python does not fill this |
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72 raise |
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73 |
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74 def load(ui, name, path): |
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75 if name.startswith('hgext.') or name.startswith('hgext/'): |
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76 shortname = name[6:] |
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77 else: |
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78 shortname = name |
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79 if shortname in _builtin: |
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80 return None |
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81 if shortname in _extensions: |
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82 return _extensions[shortname] |
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83 _extensions[shortname] = None |
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84 if path: |
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85 # the module will be loaded in sys.modules |
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86 # choose an unique name so that it doesn't |
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87 # conflicts with other modules |
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88 mod = loadpath(path, 'hgext.%s' % name) |
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89 else: |
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90 def importh(name): |
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91 mod = __import__(name) |
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92 components = name.split('.') |
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93 for comp in components[1:]: |
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94 mod = getattr(mod, comp) |
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95 return mod |
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96 try: |
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97 mod = importh("hgext.%s" % name) |
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98 except ImportError as err: |
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99 ui.debug('could not import hgext.%s (%s): trying %s\n' |
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100 % (name, err, name)) |
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101 if ui.debugflag: |
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102 ui.traceback() |
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103 mod = importh(name) |
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104 |
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105 # Before we do anything with the extension, check against minimum stated |
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106 # compatibility. This gives extension authors a mechanism to have their |
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107 # extensions short circuit when loaded with a known incompatible version |
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108 # of Mercurial. |
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109 minver = getattr(mod, 'minimumhgversion', None) |
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110 if minver and util.versiontuple(minver, 2) > util.versiontuple(n=2): |
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111 ui.warn(_('(third party extension %s requires version %s or newer ' |
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112 'of Mercurial; disabling)\n') % (shortname, minver)) |
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113 return |
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114 |
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115 _extensions[shortname] = mod |
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116 _order.append(shortname) |
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117 for fn in _aftercallbacks.get(shortname, []): |
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118 fn(loaded=True) |
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119 return mod |
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120 |
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122 result = ui.configitems("extensions") |
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123 newindex = len(_order) |
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124 for (name, path) in result: |
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125 if path: |
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126 if path[0] == '!': |
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127 continue |
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128 try: |
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129 load(ui, name, path) |
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130 except KeyboardInterrupt: |
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131 raise |
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132 except Exception as inst: |
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133 if path: |
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134 ui.warn(_("*** failed to import extension %s from %s: %s\n") |
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135 % (name, path, inst)) |
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136 else: |
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137 ui.warn(_("*** failed to import extension %s: %s\n") |
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138 % (name, inst)) |
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139 ui.traceback() |
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140 |
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141 for name in _order[newindex:]: |
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142 uisetup = getattr(_extensions[name], 'uisetup', None) |
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143 if uisetup: |
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144 uisetup(ui) |
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145 |
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146 for name in _order[newindex:]: |
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147 extsetup = getattr(_extensions[name], 'extsetup', None) |
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148 if extsetup: |
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149 try: |
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150 extsetup(ui) |
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151 except TypeError: |
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152 if extsetup.func_code.co_argcount != 0: |
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153 raise |
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154 extsetup() # old extsetup with no ui argument |
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155 |
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156 # Call aftercallbacks that were never met. |
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157 for shortname in _aftercallbacks: |
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158 if shortname in _extensions: |
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159 continue |
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160 |
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161 for fn in _aftercallbacks[shortname]: |
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162 fn(loaded=False) |
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163 |
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164 # loadall() is called multiple times and lingering _aftercallbacks |
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165 # entries could result in double execution. See issue4646. |
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166 _aftercallbacks.clear() |
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167 |
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168 def afterloaded(extension, callback): |
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169 '''Run the specified function after a named extension is loaded. |
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170 |
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171 If the named extension is already loaded, the callback will be called |
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172 immediately. |
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173 |
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174 If the named extension never loads, the callback will be called after |
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175 all extensions have been loaded. |
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176 |
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177 The callback receives the named argument ``loaded``, which is a boolean |
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178 indicating whether the dependent extension actually loaded. |
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179 ''' |
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180 |
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181 if extension in _extensions: |
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182 callback(loaded=True) |
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183 else: |
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184 _aftercallbacks.setdefault(extension, []).append(callback) |
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185 |
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186 def bind(func, *args): |
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187 '''Partial function application |
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188 |
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189 Returns a new function that is the partial application of args and kwargs |
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190 to func. For example, |
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191 |
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192 f(1, 2, bar=3) === bind(f, 1)(2, bar=3)''' |
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193 assert callable(func) |
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194 def closure(*a, **kw): |
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195 return func(*(args + a), **kw) |
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196 return closure |
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197 |
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198 def wrapcommand(table, command, wrapper, synopsis=None, docstring=None): |
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199 '''Wrap the command named `command' in table |
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200 |
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201 Replace command in the command table with wrapper. The wrapped command will |
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202 be inserted into the command table specified by the table argument. |
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203 |
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204 The wrapper will be called like |
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205 |
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206 wrapper(orig, *args, **kwargs) |
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207 |
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208 where orig is the original (wrapped) function, and *args, **kwargs |
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209 are the arguments passed to it. |
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210 |
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211 Optionally append to the command synopsis and docstring, used for help. |
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212 For example, if your extension wraps the ``bookmarks`` command to add the |
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213 flags ``--remote`` and ``--all`` you might call this function like so: |
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214 |
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215 synopsis = ' [-a] [--remote]' |
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216 docstring = """ |
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217 |
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218 The ``remotenames`` extension adds the ``--remote`` and ``--all`` (``-a``) |
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219 flags to the bookmarks command. Either flag will show the remote bookmarks |
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220 known to the repository; ``--remote`` will also suppress the output of the |
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221 local bookmarks. |
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222 """ |
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223 |
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224 extensions.wrapcommand(commands.table, 'bookmarks', exbookmarks, |
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225 synopsis, docstring) |
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226 ''' |
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227 assert callable(wrapper) |
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228 aliases, entry = cmdutil.findcmd(command, table) |
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229 for alias, e in table.iteritems(): |
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230 if e is entry: |
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231 key = alias |
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232 break |
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233 |
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234 origfn = entry[0] |
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235 wrap = bind(util.checksignature(wrapper), util.checksignature(origfn)) |
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236 |
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237 wrap.__module__ = getattr(origfn, '__module__') |
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238 |
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239 doc = getattr(origfn, '__doc__') |
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240 if docstring is not None: |
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241 doc += docstring |
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242 wrap.__doc__ = doc |
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243 |
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244 newentry = list(entry) |
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245 newentry[0] = wrap |
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246 if synopsis is not None: |
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247 newentry[2] += synopsis |
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248 table[key] = tuple(newentry) |
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249 return entry |
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250 |
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251 def wrapfunction(container, funcname, wrapper): |
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252 '''Wrap the function named funcname in container |
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253 |
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254 Replace the funcname member in the given container with the specified |
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255 wrapper. The container is typically a module, class, or instance. |
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256 |
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257 The wrapper will be called like |
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258 |
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259 wrapper(orig, *args, **kwargs) |
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260 |
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261 where orig is the original (wrapped) function, and *args, **kwargs |
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262 are the arguments passed to it. |
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263 |
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264 Wrapping methods of the repository object is not recommended since |
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265 it conflicts with extensions that extend the repository by |
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266 subclassing. All extensions that need to extend methods of |
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267 localrepository should use this subclassing trick: namely, |
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268 reposetup() should look like |
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269 |
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270 def reposetup(ui, repo): |
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271 class myrepo(repo.__class__): |
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272 def whatever(self, *args, **kwargs): |
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273 [...extension stuff...] |
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274 super(myrepo, self).whatever(*args, **kwargs) |
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275 [...extension stuff...] |
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276 |
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277 repo.__class__ = myrepo |
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278 |
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279 In general, combining wrapfunction() with subclassing does not |
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280 work. Since you cannot control what other extensions are loaded by |
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281 your end users, you should play nicely with others by using the |
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282 subclass trick. |
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283 ''' |
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284 assert callable(wrapper) |
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285 |
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286 origfn = getattr(container, funcname) |
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287 assert callable(origfn) |
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288 setattr(container, funcname, bind(wrapper, origfn)) |
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289 return origfn |
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290 |
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291 def _disabledpaths(strip_init=False): |
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292 '''find paths of disabled extensions. returns a dict of {name: path} |
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293 removes /__init__.py from packages if strip_init is True''' |
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294 import hgext |
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295 extpath = os.path.dirname(os.path.abspath(hgext.__file__)) |
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296 try: # might not be a filesystem path |
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297 files = os.listdir(extpath) |
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298 except OSError: |
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299 return {} |
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300 |
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301 exts = {} |
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302 for e in files: |
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303 if e.endswith('.py'): |
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304 name = e.rsplit('.', 1)[0] |
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305 path = os.path.join(extpath, e) |
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306 else: |
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307 name = e |
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308 path = os.path.join(extpath, e, '__init__.py') |
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309 if not os.path.exists(path): |
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310 continue |
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311 if strip_init: |
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312 path = os.path.dirname(path) |
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313 if name in exts or name in _order or name == '__init__': |
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314 continue |
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315 exts[name] = path |
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316 return exts |
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317 |
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318 def _moduledoc(file): |
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319 '''return the top-level python documentation for the given file |
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320 |
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321 Loosely inspired by pydoc.source_synopsis(), but rewritten to |
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322 handle triple quotes and to return the whole text instead of just |
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323 the synopsis''' |
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324 result = [] |
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325 |
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326 line = file.readline() |
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327 while line[:1] == '#' or not line.strip(): |
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328 line = file.readline() |
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329 if not line: |
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330 break |
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331 |
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332 start = line[:3] |
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333 if start == '"""' or start == "'''": |
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334 line = line[3:] |
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335 while line: |
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336 if line.rstrip().endswith(start): |
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337 line = line.split(start)[0] |
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338 if line: |
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339 result.append(line) |
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340 break |
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341 elif not line: |
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342 return None # unmatched delimiter |
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343 result.append(line) |
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344 line = file.readline() |
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345 else: |
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346 return None |
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347 |
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348 return ''.join(result) |
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349 |
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350 def _disabledhelp(path): |
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351 '''retrieve help synopsis of a disabled extension (without importing)''' |
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352 try: |
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353 file = open(path) |
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354 except IOError: |
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355 return |
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356 else: |
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357 doc = _moduledoc(file) |
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358 file.close() |
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359 |
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360 if doc: # extracting localized synopsis |
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361 return gettext(doc).splitlines()[0] |
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362 else: |
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363 return _('(no help text available)') |
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364 |
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365 def disabled(): |
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366 '''find disabled extensions from hgext. returns a dict of {name: desc}''' |
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367 try: |
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368 from hgext import __index__ |
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369 return dict((name, gettext(desc)) |
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370 for name, desc in __index__.docs.iteritems() |
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371 if name not in _order) |
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372 except (ImportError, AttributeError): |
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373 pass |
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374 |
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375 paths = _disabledpaths() |
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376 if not paths: |
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377 return {} |
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378 |
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379 exts = {} |
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380 for name, path in paths.iteritems(): |
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381 doc = _disabledhelp(path) |
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382 if doc: |
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383 exts[name] = doc |
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384 |
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385 return exts |
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386 |
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387 def disabledext(name): |
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388 '''find a specific disabled extension from hgext. returns desc''' |
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389 try: |
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390 from hgext import __index__ |
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391 if name in _order: # enabled |
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392 return |
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393 else: |
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394 return gettext(__index__.docs.get(name)) |
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395 except (ImportError, AttributeError): |
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396 pass |
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397 |
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398 paths = _disabledpaths() |
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399 if name in paths: |
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400 return _disabledhelp(paths[name]) |
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401 |
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402 def disabledcmd(ui, cmd, strict=False): |
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403 '''import disabled extensions until cmd is found. |
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404 returns (cmdname, extname, module)''' |
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405 |
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406 paths = _disabledpaths(strip_init=True) |
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407 if not paths: |
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408 raise error.UnknownCommand(cmd) |
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409 |
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410 def findcmd(cmd, name, path): |
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411 try: |
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412 mod = loadpath(path, 'hgext.%s' % name) |
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413 except Exception: |
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414 return |
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415 try: |
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416 aliases, entry = cmdutil.findcmd(cmd, |
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417 getattr(mod, 'cmdtable', {}), strict) |
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418 except (error.AmbiguousCommand, error.UnknownCommand): |
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419 return |
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420 except Exception: |
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421 ui.warn(_('warning: error finding commands in %s\n') % path) |
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422 ui.traceback() |
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423 return |
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424 for c in aliases: |
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425 if c.startswith(cmd): |
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426 cmd = c |
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427 break |
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428 else: |
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429 cmd = aliases[0] |
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430 return (cmd, name, mod) |
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431 |
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432 ext = None |
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433 # first, search for an extension with the same name as the command |
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434 path = paths.pop(cmd, None) |
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435 if path: |
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436 ext = findcmd(cmd, cmd, path) |
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437 if not ext: |
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438 # otherwise, interrogate each extension until there's a match |
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439 for name, path in paths.iteritems(): |
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440 ext = findcmd(cmd, name, path) |
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441 if ext: |
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442 break |
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443 if ext and 'DEPRECATED' not in ext.__doc__: |
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444 return ext |
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445 |
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446 raise error.UnknownCommand(cmd) |
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447 |
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448 def enabled(shortname=True): |
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449 '''return a dict of {name: desc} of extensions''' |
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450 exts = {} |
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451 for ename, ext in extensions(): |
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452 doc = (gettext(ext.__doc__) or _('(no help text available)')) |
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453 if shortname: |
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|
454 ename = ename.split('.')[-1] |
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for calls expecting bool args, pass bool instead of int
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455 exts[ename] = doc.splitlines()[0].strip() |
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456 |
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457 return exts |
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diff
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|
458 |
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459 def moduleversion(module): |
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460 '''return version information from given module as a string''' |
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461 if (util.safehasattr(module, 'getversion') |
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462 and callable(module.getversion)): |
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diff
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|
463 version = module.getversion() |
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|
464 elif util.safehasattr(module, '__version__'): |
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|
465 version = module.__version__ |
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|
466 else: |
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diff
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|
467 version = '' |
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|
468 if isinstance(version, (list, tuple)): |
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|
469 version = '.'.join(str(o) for o in version) |
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470 return version |