Mercurial > hg
annotate mercurial/extensions.py @ 16371:4417eb761ba8
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author | Matt Mackall <mpm@selenic.com> |
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date | Fri, 06 Apr 2012 15:16:30 -0500 |
parents | 56da00994067 |
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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 _order = [] |
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14 _ignore = ['hbisect', 'bookmarks', 'parentrevspec'] |
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15 |
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16 def extensions(): |
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17 for name in _order: |
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18 module = _extensions[name] |
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19 if module: |
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20 yield name, module |
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21 |
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22 def find(name): |
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23 '''return module with given extension name''' |
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24 mod = None |
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25 try: |
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26 mod = _extensions[name] |
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27 except KeyError: |
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28 for k, v in _extensions.iteritems(): |
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29 if k.endswith('.' + name) or k.endswith('/' + name): |
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30 mod = v |
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31 break |
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32 if not mod: |
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33 raise KeyError(name) |
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34 return mod |
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35 |
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36 def loadpath(path, module_name): |
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37 module_name = module_name.replace('.', '_') |
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38 path = util.expandpath(path) |
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39 if os.path.isdir(path): |
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40 # module/__init__.py style |
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41 d, f = os.path.split(path.rstrip('/')) |
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42 fd, fpath, desc = imp.find_module(f, [d]) |
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43 return imp.load_module(module_name, fd, fpath, desc) |
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44 else: |
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45 return imp.load_source(module_name, path) |
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46 |
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47 def load(ui, name, path): |
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48 # unused ui argument kept for backwards compatibility |
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49 if name.startswith('hgext.') or name.startswith('hgext/'): |
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50 shortname = name[6:] |
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51 else: |
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52 shortname = name |
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53 if shortname in _ignore: |
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54 return None |
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55 if shortname in _extensions: |
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56 return _extensions[shortname] |
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57 _extensions[shortname] = None |
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58 if path: |
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59 # the module will be loaded in sys.modules |
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60 # choose an unique name so that it doesn't |
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61 # conflicts with other modules |
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62 mod = loadpath(path, 'hgext.%s' % name) |
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63 else: |
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64 def importh(name): |
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65 mod = __import__(name) |
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66 components = name.split('.') |
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67 for comp in components[1:]: |
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68 mod = getattr(mod, comp) |
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69 return mod |
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70 try: |
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71 mod = importh("hgext.%s" % name) |
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72 except ImportError, err: |
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73 ui.debug('could not import hgext.%s (%s): trying %s\n' |
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74 % (name, err, name)) |
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75 mod = importh(name) |
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76 _extensions[shortname] = mod |
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77 _order.append(shortname) |
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78 return mod |
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79 |
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80 def loadall(ui): |
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81 result = ui.configitems("extensions") |
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82 newindex = len(_order) |
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83 for (name, path) in result: |
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84 if path: |
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85 if path[0] == '!': |
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86 continue |
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87 try: |
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88 load(ui, name, path) |
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89 except KeyboardInterrupt: |
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90 raise |
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91 except Exception, inst: |
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92 if path: |
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93 ui.warn(_("*** failed to import extension %s from %s: %s\n") |
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94 % (name, path, inst)) |
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95 else: |
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96 ui.warn(_("*** failed to import extension %s: %s\n") |
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97 % (name, inst)) |
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98 if ui.traceback(): |
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99 return 1 |
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100 |
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101 for name in _order[newindex:]: |
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102 uisetup = getattr(_extensions[name], 'uisetup', None) |
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103 if uisetup: |
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104 uisetup(ui) |
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105 |
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106 for name in _order[newindex:]: |
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107 extsetup = getattr(_extensions[name], 'extsetup', None) |
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108 if extsetup: |
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109 try: |
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110 extsetup(ui) |
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111 except TypeError: |
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112 if extsetup.func_code.co_argcount != 0: |
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113 raise |
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114 extsetup() # old extsetup with no ui argument |
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115 |
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116 def wrapcommand(table, command, wrapper): |
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117 '''Wrap the command named `command' in table |
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118 |
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119 Replace command in the command table with wrapper. The wrapped command will |
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120 be inserted into the command table specified by the table argument. |
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121 |
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122 The wrapper will be called like |
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123 |
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124 wrapper(orig, *args, **kwargs) |
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125 |
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126 where orig is the original (wrapped) function, and *args, **kwargs |
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127 are the arguments passed to it. |
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128 ''' |
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129 assert util.safehasattr(wrapper, '__call__') |
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130 aliases, entry = cmdutil.findcmd(command, table) |
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131 for alias, e in table.iteritems(): |
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132 if e is entry: |
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133 key = alias |
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134 break |
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135 |
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136 origfn = entry[0] |
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137 def wrap(*args, **kwargs): |
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138 return util.checksignature(wrapper)( |
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139 util.checksignature(origfn), *args, **kwargs) |
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140 |
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141 wrap.__doc__ = getattr(origfn, '__doc__') |
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142 wrap.__module__ = getattr(origfn, '__module__') |
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143 |
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144 newentry = list(entry) |
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145 newentry[0] = wrap |
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146 table[key] = tuple(newentry) |
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147 return entry |
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148 |
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149 def wrapfunction(container, funcname, wrapper): |
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150 '''Wrap the function named funcname in container |
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151 |
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152 Replace the funcname member in the given container with the specified |
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153 wrapper. The container is typically a module, class, or instance. |
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154 |
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155 The wrapper will be called like |
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156 |
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157 wrapper(orig, *args, **kwargs) |
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158 |
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159 where orig is the original (wrapped) function, and *args, **kwargs |
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160 are the arguments passed to it. |
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161 |
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162 Wrapping methods of the repository object is not recommended since |
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163 it conflicts with extensions that extend the repository by |
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164 subclassing. All extensions that need to extend methods of |
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165 localrepository should use this subclassing trick: namely, |
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166 reposetup() should look like |
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167 |
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168 def reposetup(ui, repo): |
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169 class myrepo(repo.__class__): |
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170 def whatever(self, *args, **kwargs): |
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171 [...extension stuff...] |
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172 super(myrepo, self).whatever(*args, **kwargs) |
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173 [...extension stuff...] |
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174 |
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175 repo.__class__ = myrepo |
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176 |
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177 In general, combining wrapfunction() with subclassing does not |
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178 work. Since you cannot control what other extensions are loaded by |
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179 your end users, you should play nicely with others by using the |
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180 subclass trick. |
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181 ''' |
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182 assert util.safehasattr(wrapper, '__call__') |
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183 def wrap(*args, **kwargs): |
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184 return wrapper(origfn, *args, **kwargs) |
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185 |
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186 origfn = getattr(container, funcname) |
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187 assert util.safehasattr(origfn, '__call__') |
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188 setattr(container, funcname, wrap) |
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189 return origfn |
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190 |
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191 def _disabledpaths(strip_init=False): |
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192 '''find paths of disabled extensions. returns a dict of {name: path} |
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193 removes /__init__.py from packages if strip_init is True''' |
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194 import hgext |
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195 extpath = os.path.dirname(os.path.abspath(hgext.__file__)) |
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196 try: # might not be a filesystem path |
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197 files = os.listdir(extpath) |
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198 except OSError: |
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199 return {} |
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200 |
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201 exts = {} |
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202 for e in files: |
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203 if e.endswith('.py'): |
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204 name = e.rsplit('.', 1)[0] |
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205 path = os.path.join(extpath, e) |
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206 else: |
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207 name = e |
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208 path = os.path.join(extpath, e, '__init__.py') |
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209 if not os.path.exists(path): |
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210 continue |
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211 if strip_init: |
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212 path = os.path.dirname(path) |
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213 if name in exts or name in _order or name == '__init__': |
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214 continue |
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215 exts[name] = path |
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216 return exts |
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217 |
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218 def _moduledoc(file): |
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219 '''return the top-level python documentation for the given file |
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220 |
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221 Loosely inspired by pydoc.source_synopsis(), but rewritten to |
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222 handle triple quotes and to return the whole text instead of just |
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223 the synopsis''' |
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224 result = [] |
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225 |
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226 line = file.readline() |
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227 while line[:1] == '#' or not line.strip(): |
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228 line = file.readline() |
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229 if not line: |
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230 break |
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231 |
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232 start = line[:3] |
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233 if start == '"""' or start == "'''": |
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234 line = line[3:] |
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235 while line: |
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236 if line.rstrip().endswith(start): |
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237 line = line.split(start)[0] |
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238 if line: |
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239 result.append(line) |
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240 break |
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241 elif not line: |
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242 return None # unmatched delimiter |
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243 result.append(line) |
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244 line = file.readline() |
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245 else: |
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246 return None |
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247 |
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248 return ''.join(result) |
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249 |
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250 def _disabledhelp(path): |
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251 '''retrieve help synopsis of a disabled extension (without importing)''' |
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252 try: |
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253 file = open(path) |
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254 except IOError: |
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255 return |
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256 else: |
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257 doc = _moduledoc(file) |
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258 file.close() |
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259 |
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260 if doc: # extracting localized synopsis |
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261 return gettext(doc).splitlines()[0] |
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262 else: |
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263 return _('(no help text available)') |
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264 |
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265 def disabled(): |
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266 '''find disabled extensions from hgext. returns a dict of {name: desc}''' |
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267 try: |
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268 from hgext import __index__ |
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269 return dict((name, gettext(desc)) |
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270 for name, desc in __index__.docs.iteritems() |
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271 if name not in _order) |
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272 except ImportError: |
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273 pass |
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274 |
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275 paths = _disabledpaths() |
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276 if not paths: |
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277 return None |
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278 |
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279 exts = {} |
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280 for name, path in paths.iteritems(): |
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281 doc = _disabledhelp(path) |
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282 if doc: |
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283 exts[name] = doc |
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284 |
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285 return exts |
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286 |
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287 def disabledext(name): |
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288 '''find a specific disabled extension from hgext. returns desc''' |
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289 try: |
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290 from hgext import __index__ |
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291 if name in _order: # enabled |
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292 return |
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293 else: |
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294 return gettext(__index__.docs.get(name)) |
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295 except ImportError: |
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296 pass |
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297 |
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298 paths = _disabledpaths() |
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299 if name in paths: |
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300 return _disabledhelp(paths[name]) |
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301 |
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302 def disabledcmd(ui, cmd, strict=False): |
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303 '''import disabled extensions until cmd is found. |
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304 returns (cmdname, extname, doc)''' |
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305 |
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306 paths = _disabledpaths(strip_init=True) |
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307 if not paths: |
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308 raise error.UnknownCommand(cmd) |
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309 |
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310 def findcmd(cmd, name, path): |
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311 try: |
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312 mod = loadpath(path, 'hgext.%s' % name) |
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313 except Exception: |
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314 return |
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315 try: |
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316 aliases, entry = cmdutil.findcmd(cmd, |
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317 getattr(mod, 'cmdtable', {}), strict) |
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318 except (error.AmbiguousCommand, error.UnknownCommand): |
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319 return |
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320 except Exception: |
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321 ui.warn(_('warning: error finding commands in %s\n') % path) |
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322 ui.traceback() |
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323 return |
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324 for c in aliases: |
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325 if c.startswith(cmd): |
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326 cmd = c |
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327 break |
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328 else: |
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329 cmd = aliases[0] |
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330 return (cmd, name, mod) |
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331 |
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332 # first, search for an extension with the same name as the command |
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333 path = paths.pop(cmd, None) |
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334 if path: |
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335 ext = findcmd(cmd, cmd, path) |
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336 if ext: |
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337 return ext |
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338 |
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339 # otherwise, interrogate each extension until there's a match |
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340 for name, path in paths.iteritems(): |
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341 ext = findcmd(cmd, name, path) |
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342 if ext: |
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343 return ext |
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344 |
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345 raise error.UnknownCommand(cmd) |
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346 |
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347 def enabled(): |
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348 '''return a dict of {name: desc} of extensions''' |
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349 exts = {} |
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350 for ename, ext in extensions(): |
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351 doc = (gettext(ext.__doc__) or _('(no help text available)')) |
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352 ename = ename.split('.')[-1] |
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353 exts[ename] = doc.splitlines()[0].strip() |
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354 |
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355 return exts |