Mercurial > hg
annotate mercurial/extensions.py @ 12044:bcc7139521b7
bundlerepo: remove duplication of bundle decompressors
author | Matt Mackall <mpm@selenic.com> |
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date | Wed, 25 Aug 2010 16:55:54 -0500 |
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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, help, 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 _order = [] |
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14 |
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15 def extensions(): |
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16 for name in _order: |
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17 module = _extensions[name] |
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18 if module: |
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19 yield name, module |
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20 |
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21 def find(name): |
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22 '''return module with given extension name''' |
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23 try: |
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24 return _extensions[name] |
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25 except KeyError: |
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26 for k, v in _extensions.iteritems(): |
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27 if k.endswith('.' + name) or k.endswith('/' + name): |
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28 return v |
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29 raise KeyError(name) |
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30 |
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31 def loadpath(path, module_name): |
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32 module_name = module_name.replace('.', '_') |
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33 path = util.expandpath(path) |
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34 if os.path.isdir(path): |
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35 # module/__init__.py style |
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36 d, f = os.path.split(path.rstrip('/')) |
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37 fd, fpath, desc = imp.find_module(f, [d]) |
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38 return imp.load_module(module_name, fd, fpath, desc) |
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39 else: |
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40 return imp.load_source(module_name, path) |
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41 |
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42 def load(ui, name, path): |
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43 # unused ui argument kept for backwards compatibility |
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44 if name.startswith('hgext.') or name.startswith('hgext/'): |
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45 shortname = name[6:] |
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46 else: |
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47 shortname = name |
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48 if shortname in _extensions: |
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49 return |
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50 _extensions[shortname] = None |
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51 if path: |
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52 # the module will be loaded in sys.modules |
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53 # choose an unique name so that it doesn't |
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54 # conflicts with other modules |
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55 mod = loadpath(path, 'hgext.%s' % name) |
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56 else: |
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57 def importh(name): |
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58 mod = __import__(name) |
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59 components = name.split('.') |
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60 for comp in components[1:]: |
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61 mod = getattr(mod, comp) |
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62 return mod |
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63 try: |
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64 mod = importh("hgext.%s" % name) |
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65 except ImportError: |
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66 mod = importh(name) |
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67 _extensions[shortname] = mod |
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68 _order.append(shortname) |
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69 |
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70 def loadall(ui): |
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71 result = ui.configitems("extensions") |
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72 newindex = len(_order) |
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73 for (name, path) in result: |
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74 if path: |
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75 if path[0] == '!': |
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76 continue |
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77 try: |
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78 load(ui, name, path) |
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79 except KeyboardInterrupt: |
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80 raise |
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81 except Exception, inst: |
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82 if path: |
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83 ui.warn(_("*** failed to import extension %s from %s: %s\n") |
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84 % (name, path, inst)) |
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85 else: |
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86 ui.warn(_("*** failed to import extension %s: %s\n") |
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87 % (name, inst)) |
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88 if ui.traceback(): |
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89 return 1 |
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90 |
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91 for name in _order[newindex:]: |
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92 uisetup = getattr(_extensions[name], 'uisetup', None) |
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93 if uisetup: |
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94 uisetup(ui) |
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95 |
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96 for name in _order[newindex:]: |
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97 extsetup = getattr(_extensions[name], 'extsetup', None) |
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98 if extsetup: |
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99 try: |
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100 extsetup(ui) |
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101 except TypeError: |
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102 if extsetup.func_code.co_argcount != 0: |
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103 raise |
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104 extsetup() # old extsetup with no ui argument |
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105 |
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106 def wrapcommand(table, command, wrapper): |
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107 '''Wrap the command named `command' in table |
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108 |
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109 Replace command in the command table with wrapper. The wrapped command will |
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110 be inserted into the command table specified by the table argument. |
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111 |
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112 The wrapper will be called like |
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113 |
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114 wrapper(orig, *args, **kwargs) |
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115 |
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116 where orig is the original (wrapped) function, and *args, **kwargs |
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117 are the arguments passed to it. |
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118 ''' |
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119 assert hasattr(wrapper, '__call__') |
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120 aliases, entry = cmdutil.findcmd(command, table) |
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121 for alias, e in table.iteritems(): |
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122 if e is entry: |
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123 key = alias |
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124 break |
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125 |
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126 origfn = entry[0] |
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127 def wrap(*args, **kwargs): |
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128 return util.checksignature(wrapper)( |
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129 util.checksignature(origfn), *args, **kwargs) |
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130 |
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131 wrap.__doc__ = getattr(origfn, '__doc__') |
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132 wrap.__module__ = getattr(origfn, '__module__') |
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133 |
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134 newentry = list(entry) |
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135 newentry[0] = wrap |
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136 table[key] = tuple(newentry) |
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137 return entry |
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138 |
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139 def wrapfunction(container, funcname, wrapper): |
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140 '''Wrap the function named funcname in container |
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141 |
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142 Replace the funcname member in the given container with the specified |
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143 wrapper. The container is typically a module, class, or instance. |
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144 |
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145 The wrapper will be called like |
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146 |
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147 wrapper(orig, *args, **kwargs) |
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148 |
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149 where orig is the original (wrapped) function, and *args, **kwargs |
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150 are the arguments passed to it. |
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151 |
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152 Wrapping methods of the repository object is not recommended since |
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153 it conflicts with extensions that extend the repository by |
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154 subclassing. All extensions that need to extend methods of |
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155 localrepository should use this subclassing trick: namely, |
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156 reposetup() should look like |
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157 |
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158 def reposetup(ui, repo): |
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159 class myrepo(repo.__class__): |
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160 def whatever(self, *args, **kwargs): |
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161 [...extension stuff...] |
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162 super(myrepo, self).whatever(*args, **kwargs) |
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163 [...extension stuff...] |
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164 |
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165 repo.__class__ = myrepo |
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166 |
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167 In general, combining wrapfunction() with subclassing does not |
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168 work. Since you cannot control what other extensions are loaded by |
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169 your end users, you should play nicely with others by using the |
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170 subclass trick. |
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171 ''' |
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172 assert hasattr(wrapper, '__call__') |
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173 def wrap(*args, **kwargs): |
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174 return wrapper(origfn, *args, **kwargs) |
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175 |
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176 origfn = getattr(container, funcname) |
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177 assert hasattr(origfn, '__call__') |
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178 setattr(container, funcname, wrap) |
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179 return origfn |
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180 |
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181 def _disabledpaths(strip_init=False): |
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182 '''find paths of disabled extensions. returns a dict of {name: path} |
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183 removes /__init__.py from packages if strip_init is True''' |
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184 import hgext |
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185 extpath = os.path.dirname(os.path.abspath(hgext.__file__)) |
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186 try: # might not be a filesystem path |
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187 files = os.listdir(extpath) |
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188 except OSError: |
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189 return {} |
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190 |
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191 exts = {} |
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192 for e in files: |
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193 if e.endswith('.py'): |
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194 name = e.rsplit('.', 1)[0] |
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195 path = os.path.join(extpath, e) |
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196 else: |
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197 name = e |
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198 path = os.path.join(extpath, e, '__init__.py') |
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199 if not os.path.exists(path): |
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200 continue |
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201 if strip_init: |
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202 path = os.path.dirname(path) |
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203 if name in exts or name in _order or name == '__init__': |
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204 continue |
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205 exts[name] = path |
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206 return exts |
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207 |
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208 def _disabledhelp(path): |
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209 '''retrieve help synopsis of a disabled extension (without importing)''' |
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210 try: |
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211 file = open(path) |
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212 except IOError: |
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213 return |
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214 else: |
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215 doc = help.moduledoc(file) |
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216 file.close() |
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217 |
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218 if doc: # extracting localized synopsis |
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219 return gettext(doc).splitlines()[0] |
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220 else: |
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221 return _('(no help text available)') |
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222 |
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223 def disabled(): |
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224 '''find disabled extensions from hgext |
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225 returns a dict of {name: desc}, and the max name length''' |
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226 |
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227 paths = _disabledpaths() |
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228 if not paths: |
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229 return None, 0 |
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230 |
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231 exts = {} |
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232 maxlength = 0 |
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233 for name, path in paths.iteritems(): |
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234 doc = _disabledhelp(path) |
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235 if not doc: |
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236 continue |
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237 |
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238 exts[name] = doc |
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239 if len(name) > maxlength: |
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240 maxlength = len(name) |
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241 |
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242 return exts, maxlength |
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243 |
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244 def disabledext(name): |
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245 '''find a specific disabled extension from hgext. returns desc''' |
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246 paths = _disabledpaths() |
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247 if name in paths: |
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248 return _disabledhelp(paths[name]) |
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249 |
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250 def disabledcmd(cmd, strict=False): |
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251 '''import disabled extensions until cmd is found. |
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252 returns (cmdname, extname, doc)''' |
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253 |
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254 paths = _disabledpaths(strip_init=True) |
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255 if not paths: |
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256 raise error.UnknownCommand(cmd) |
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257 |
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258 def findcmd(cmd, name, path): |
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259 try: |
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260 mod = loadpath(path, 'hgext.%s' % name) |
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261 except Exception: |
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262 return |
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263 try: |
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264 aliases, entry = cmdutil.findcmd(cmd, |
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265 getattr(mod, 'cmdtable', {}), strict) |
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266 except (error.AmbiguousCommand, error.UnknownCommand): |
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267 return |
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268 for c in aliases: |
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269 if c.startswith(cmd): |
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270 cmd = c |
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271 break |
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272 else: |
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273 cmd = aliases[0] |
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274 return (cmd, name, mod) |
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275 |
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276 # first, search for an extension with the same name as the command |
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277 path = paths.pop(cmd, None) |
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278 if path: |
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279 ext = findcmd(cmd, cmd, path) |
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280 if ext: |
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281 return ext |
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282 |
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283 # otherwise, interrogate each extension until there's a match |
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284 for name, path in paths.iteritems(): |
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285 ext = findcmd(cmd, name, path) |
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286 if ext: |
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287 return ext |
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288 |
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289 raise error.UnknownCommand(cmd) |
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290 |
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291 def enabled(): |
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292 '''return a dict of {name: desc} of extensions, and the max name length''' |
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293 exts = {} |
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294 maxlength = 0 |
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295 for ename, ext in extensions(): |
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296 doc = (gettext(ext.__doc__) or _('(no help text available)')) |
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297 ename = ename.split('.')[-1] |
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298 maxlength = max(len(ename), maxlength) |
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299 exts[ename] = doc.splitlines()[0].strip() |
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300 |
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301 return exts, maxlength |