Mercurial > hg
annotate mercurial/extensions.py @ 32078:bf5e13e38390 stable
pager: use less as a fallback on Unix
This seems reasonable choice per discussion, and the default-default of Git.
See also the inline-comment for why.
https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-April/097042.html
author | Yuya Nishihara <yuya@tcha.org> |
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date | Fri, 28 Apr 2017 20:51:14 +0900 |
parents | 6419cd243017 |
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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 inspect |
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12 import os |
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13 |
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14 from .i18n import ( |
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15 _, |
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16 gettext, |
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17 ) |
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18 |
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19 from . import ( |
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20 cmdutil, |
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21 encoding, |
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22 error, |
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23 pycompat, |
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24 util, |
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25 ) |
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26 |
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27 _extensions = {} |
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28 _disabledextensions = {} |
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29 _aftercallbacks = {} |
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30 _order = [] |
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31 _builtin = set(['hbisect', 'bookmarks', 'parentrevspec', 'progress', 'interhg', |
29162 | 32 'inotify', 'hgcia']) |
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33 |
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34 def extensions(ui=None): |
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35 if ui: |
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36 def enabled(name): |
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37 for format in ['%s', 'hgext.%s']: |
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38 conf = ui.config('extensions', format % name) |
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39 if conf is not None and not conf.startswith('!'): |
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40 return True |
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41 else: |
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42 enabled = lambda name: True |
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43 for name in _order: |
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44 module = _extensions[name] |
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45 if module and enabled(name): |
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46 yield name, module |
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47 |
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48 def find(name): |
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49 '''return module with given extension name''' |
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50 mod = None |
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51 try: |
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52 mod = _extensions[name] |
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53 except KeyError: |
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54 for k, v in _extensions.iteritems(): |
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55 if k.endswith('.' + name) or k.endswith('/' + name): |
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56 mod = v |
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57 break |
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58 if not mod: |
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59 raise KeyError(name) |
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60 return mod |
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61 |
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62 def loadpath(path, module_name): |
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63 module_name = module_name.replace('.', '_') |
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64 path = util.normpath(util.expandpath(path)) |
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65 module_name = pycompat.fsdecode(module_name) |
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66 path = pycompat.fsdecode(path) |
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67 if os.path.isdir(path): |
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68 # module/__init__.py style |
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69 d, f = os.path.split(path) |
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70 fd, fpath, desc = imp.find_module(f, [d]) |
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71 return imp.load_module(module_name, fd, fpath, desc) |
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72 else: |
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73 try: |
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74 return imp.load_source(module_name, path) |
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75 except IOError as exc: |
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76 if not exc.filename: |
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77 exc.filename = path # python does not fill this |
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78 raise |
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79 |
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80 def _importh(name): |
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81 """import and return the <name> module""" |
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82 mod = __import__(pycompat.sysstr(name)) |
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83 components = name.split('.') |
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84 for comp in components[1:]: |
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85 mod = getattr(mod, comp) |
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86 return mod |
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87 |
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88 def _importext(name, path=None, reportfunc=None): |
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89 if path: |
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90 # the module will be loaded in sys.modules |
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91 # choose an unique name so that it doesn't |
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92 # conflicts with other modules |
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93 mod = loadpath(path, 'hgext.%s' % name) |
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94 else: |
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95 try: |
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96 mod = _importh("hgext.%s" % name) |
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97 except ImportError as err: |
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98 if reportfunc: |
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99 reportfunc(err, "hgext.%s" % name, "hgext3rd.%s" % name) |
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100 try: |
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101 mod = _importh("hgext3rd.%s" % name) |
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102 except ImportError as err: |
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103 if reportfunc: |
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104 reportfunc(err, "hgext3rd.%s" % name, name) |
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105 mod = _importh(name) |
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106 return mod |
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107 |
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108 def _forbytes(inst): |
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109 """Portably format an import error into a form suitable for |
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110 %-formatting into bytestrings.""" |
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111 return encoding.strtolocal(str(inst)) |
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112 |
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113 def _reportimporterror(ui, err, failed, next): |
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114 # note: this ui.debug happens before --debug is processed, |
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115 # Use --config ui.debug=1 to see them. |
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116 ui.debug('could not import %s (%s): trying %s\n' |
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117 % (failed, _forbytes(err), next)) |
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118 if ui.debugflag: |
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119 ui.traceback() |
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120 |
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121 def load(ui, name, path): |
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122 if name.startswith('hgext.') or name.startswith('hgext/'): |
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123 shortname = name[6:] |
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124 else: |
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125 shortname = name |
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126 if shortname in _builtin: |
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127 return None |
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128 if shortname in _extensions: |
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129 return _extensions[shortname] |
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130 _extensions[shortname] = None |
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131 mod = _importext(name, path, bind(_reportimporterror, ui)) |
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132 |
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133 # Before we do anything with the extension, check against minimum stated |
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134 # compatibility. This gives extension authors a mechanism to have their |
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135 # extensions short circuit when loaded with a known incompatible version |
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136 # of Mercurial. |
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137 minver = getattr(mod, 'minimumhgversion', None) |
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138 if minver and util.versiontuple(minver, 2) > util.versiontuple(n=2): |
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139 ui.warn(_('(third party extension %s requires version %s or newer ' |
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140 'of Mercurial; disabling)\n') % (shortname, minver)) |
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141 return |
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142 |
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143 _extensions[shortname] = mod |
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144 _order.append(shortname) |
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145 for fn in _aftercallbacks.get(shortname, []): |
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146 fn(loaded=True) |
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147 return mod |
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148 |
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149 def _runuisetup(name, ui): |
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150 uisetup = getattr(_extensions[name], 'uisetup', None) |
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151 if uisetup: |
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152 uisetup(ui) |
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153 |
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154 def _runextsetup(name, ui): |
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155 extsetup = getattr(_extensions[name], 'extsetup', None) |
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156 if extsetup: |
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157 try: |
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158 extsetup(ui) |
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159 except TypeError: |
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160 if inspect.getargspec(extsetup).args: |
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161 raise |
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162 extsetup() # old extsetup with no ui argument |
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163 |
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164 def loadall(ui): |
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165 result = ui.configitems("extensions") |
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166 newindex = len(_order) |
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167 for (name, path) in result: |
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168 if path: |
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169 if path[0:1] == '!': |
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170 _disabledextensions[name] = path[1:] |
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171 continue |
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172 try: |
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173 load(ui, name, path) |
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174 except KeyboardInterrupt: |
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175 raise |
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176 except Exception as inst: |
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177 inst = _forbytes(inst) |
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178 if path: |
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179 ui.warn(_("*** failed to import extension %s from %s: %s\n") |
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180 % (name, path, inst)) |
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181 else: |
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182 ui.warn(_("*** failed to import extension %s: %s\n") |
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183 % (name, inst)) |
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184 ui.traceback() |
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185 |
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186 for name in _order[newindex:]: |
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187 _runuisetup(name, ui) |
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188 |
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189 for name in _order[newindex:]: |
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190 _runextsetup(name, ui) |
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191 |
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192 # Call aftercallbacks that were never met. |
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193 for shortname in _aftercallbacks: |
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194 if shortname in _extensions: |
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195 continue |
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196 |
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197 for fn in _aftercallbacks[shortname]: |
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198 fn(loaded=False) |
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199 |
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200 # loadall() is called multiple times and lingering _aftercallbacks |
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201 # entries could result in double execution. See issue4646. |
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202 _aftercallbacks.clear() |
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203 |
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204 def afterloaded(extension, callback): |
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205 '''Run the specified function after a named extension is loaded. |
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206 |
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207 If the named extension is already loaded, the callback will be called |
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208 immediately. |
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209 |
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210 If the named extension never loads, the callback will be called after |
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211 all extensions have been loaded. |
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212 |
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213 The callback receives the named argument ``loaded``, which is a boolean |
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214 indicating whether the dependent extension actually loaded. |
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215 ''' |
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216 |
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217 if extension in _extensions: |
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218 callback(loaded=True) |
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219 else: |
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220 _aftercallbacks.setdefault(extension, []).append(callback) |
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221 |
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222 def bind(func, *args): |
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223 '''Partial function application |
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224 |
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225 Returns a new function that is the partial application of args and kwargs |
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226 to func. For example, |
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227 |
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228 f(1, 2, bar=3) === bind(f, 1)(2, bar=3)''' |
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229 assert callable(func) |
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230 def closure(*a, **kw): |
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231 return func(*(args + a), **kw) |
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232 return closure |
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233 |
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234 def _updatewrapper(wrap, origfn, unboundwrapper): |
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235 '''Copy and add some useful attributes to wrapper''' |
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236 wrap.__module__ = getattr(origfn, '__module__') |
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237 wrap.__doc__ = getattr(origfn, '__doc__') |
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238 wrap.__dict__.update(getattr(origfn, '__dict__', {})) |
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239 wrap._origfunc = origfn |
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240 wrap._unboundwrapper = unboundwrapper |
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241 |
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242 def wrapcommand(table, command, wrapper, synopsis=None, docstring=None): |
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243 '''Wrap the command named `command' in table |
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244 |
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245 Replace command in the command table with wrapper. The wrapped command will |
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246 be inserted into the command table specified by the table argument. |
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247 |
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248 The wrapper will be called like |
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249 |
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250 wrapper(orig, *args, **kwargs) |
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251 |
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252 where orig is the original (wrapped) function, and *args, **kwargs |
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253 are the arguments passed to it. |
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254 |
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255 Optionally append to the command synopsis and docstring, used for help. |
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256 For example, if your extension wraps the ``bookmarks`` command to add the |
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257 flags ``--remote`` and ``--all`` you might call this function like so: |
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258 |
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259 synopsis = ' [-a] [--remote]' |
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260 docstring = """ |
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261 |
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262 The ``remotenames`` extension adds the ``--remote`` and ``--all`` (``-a``) |
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263 flags to the bookmarks command. Either flag will show the remote bookmarks |
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264 known to the repository; ``--remote`` will also suppress the output of the |
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265 local bookmarks. |
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266 """ |
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267 |
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268 extensions.wrapcommand(commands.table, 'bookmarks', exbookmarks, |
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269 synopsis, docstring) |
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270 ''' |
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271 assert callable(wrapper) |
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272 aliases, entry = cmdutil.findcmd(command, table) |
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273 for alias, e in table.iteritems(): |
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274 if e is entry: |
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275 key = alias |
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276 break |
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277 |
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278 origfn = entry[0] |
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279 wrap = bind(util.checksignature(wrapper), util.checksignature(origfn)) |
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280 _updatewrapper(wrap, origfn, wrapper) |
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281 if docstring is not None: |
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282 wrap.__doc__ += docstring |
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283 |
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284 newentry = list(entry) |
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285 newentry[0] = wrap |
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286 if synopsis is not None: |
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287 newentry[2] += synopsis |
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288 table[key] = tuple(newentry) |
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289 return entry |
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290 |
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291 def wrapfunction(container, funcname, wrapper): |
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292 '''Wrap the function named funcname in container |
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293 |
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294 Replace the funcname member in the given container with the specified |
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295 wrapper. The container is typically a module, class, or instance. |
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296 |
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297 The wrapper will be called like |
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298 |
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299 wrapper(orig, *args, **kwargs) |
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300 |
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301 where orig is the original (wrapped) function, and *args, **kwargs |
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302 are the arguments passed to it. |
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303 |
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304 Wrapping methods of the repository object is not recommended since |
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305 it conflicts with extensions that extend the repository by |
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306 subclassing. All extensions that need to extend methods of |
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307 localrepository should use this subclassing trick: namely, |
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308 reposetup() should look like |
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309 |
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310 def reposetup(ui, repo): |
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311 class myrepo(repo.__class__): |
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312 def whatever(self, *args, **kwargs): |
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313 [...extension stuff...] |
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314 super(myrepo, self).whatever(*args, **kwargs) |
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315 [...extension stuff...] |
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316 |
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317 repo.__class__ = myrepo |
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318 |
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319 In general, combining wrapfunction() with subclassing does not |
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320 work. Since you cannot control what other extensions are loaded by |
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321 your end users, you should play nicely with others by using the |
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322 subclass trick. |
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323 ''' |
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324 assert callable(wrapper) |
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325 |
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326 origfn = getattr(container, funcname) |
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327 assert callable(origfn) |
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328 wrap = bind(wrapper, origfn) |
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329 _updatewrapper(wrap, origfn, wrapper) |
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330 setattr(container, funcname, wrap) |
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331 return origfn |
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332 |
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333 def unwrapfunction(container, funcname, wrapper=None): |
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334 '''undo wrapfunction |
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335 |
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336 If wrappers is None, undo the last wrap. Otherwise removes the wrapper |
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337 from the chain of wrappers. |
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338 |
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339 Return the removed wrapper. |
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340 Raise IndexError if wrapper is None and nothing to unwrap; ValueError if |
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341 wrapper is not None but is not found in the wrapper chain. |
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342 ''' |
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343 chain = getwrapperchain(container, funcname) |
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344 origfn = chain.pop() |
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345 if wrapper is None: |
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346 wrapper = chain[0] |
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347 chain.remove(wrapper) |
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348 setattr(container, funcname, origfn) |
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349 for w in reversed(chain): |
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350 wrapfunction(container, funcname, w) |
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351 return wrapper |
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352 |
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353 def getwrapperchain(container, funcname): |
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354 '''get a chain of wrappers of a function |
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355 |
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356 Return a list of functions: [newest wrapper, ..., oldest wrapper, origfunc] |
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357 |
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358 The wrapper functions are the ones passed to wrapfunction, whose first |
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359 argument is origfunc. |
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360 ''' |
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361 result = [] |
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362 fn = getattr(container, funcname) |
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363 while fn: |
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364 assert callable(fn) |
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365 result.append(getattr(fn, '_unboundwrapper', fn)) |
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366 fn = getattr(fn, '_origfunc', None) |
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367 return result |
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368 |
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369 def _disabledpaths(strip_init=False): |
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370 '''find paths of disabled extensions. returns a dict of {name: path} |
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371 removes /__init__.py from packages if strip_init is True''' |
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372 import hgext |
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373 extpath = os.path.dirname( |
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374 os.path.abspath(pycompat.fsencode(hgext.__file__))) |
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375 try: # might not be a filesystem path |
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376 files = os.listdir(extpath) |
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377 except OSError: |
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378 return {} |
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379 |
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380 exts = {} |
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381 for e in files: |
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382 if e.endswith('.py'): |
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383 name = e.rsplit('.', 1)[0] |
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384 path = os.path.join(extpath, e) |
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385 else: |
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386 name = e |
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387 path = os.path.join(extpath, e, '__init__.py') |
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388 if not os.path.exists(path): |
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389 continue |
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390 if strip_init: |
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391 path = os.path.dirname(path) |
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392 if name in exts or name in _order or name == '__init__': |
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393 continue |
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394 exts[name] = path |
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help: show content for explicitly disabled extension (issue5228)
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395 exts.update(_disabledextensions) |
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396 return exts |
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397 |
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398 def _moduledoc(file): |
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399 '''return the top-level python documentation for the given file |
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400 |
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401 Loosely inspired by pydoc.source_synopsis(), but rewritten to |
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402 handle triple quotes and to return the whole text instead of just |
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|
403 the synopsis''' |
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|
404 result = [] |
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|
405 |
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|
406 line = file.readline() |
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407 while line[:1] == '#' or not line.strip(): |
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408 line = file.readline() |
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409 if not line: |
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|
410 break |
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|
411 |
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|
412 start = line[:3] |
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413 if start == '"""' or start == "'''": |
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414 line = line[3:] |
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415 while line: |
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|
416 if line.rstrip().endswith(start): |
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417 line = line.split(start)[0] |
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418 if line: |
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|
419 result.append(line) |
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|
420 break |
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|
421 elif not line: |
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|
422 return None # unmatched delimiter |
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|
423 result.append(line) |
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|
424 line = file.readline() |
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|
425 else: |
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changeset
|
426 return None |
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changeset
|
427 |
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|
428 return ''.join(result) |
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|
429 |
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|
430 def _disabledhelp(path): |
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|
431 '''retrieve help synopsis of a disabled extension (without importing)''' |
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432 try: |
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|
433 file = open(path) |
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|
434 except IOError: |
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|
435 return |
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diff
changeset
|
436 else: |
14318
1f46be4689ed
help: consolidate topic hooks in help.py
Matt Mackall <mpm@selenic.com>
parents:
14317
diff
changeset
|
437 doc = _moduledoc(file) |
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|
438 file.close() |
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|
439 |
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changeset
|
440 if doc: # extracting localized synopsis |
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help: show help for disabled extensions (issue5228)
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diff
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|
441 return gettext(doc) |
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|
442 else: |
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|
443 return _('(no help text available)') |
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|
444 |
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|
445 def disabled(): |
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cd31a1cc1521
extensions: update doc of enabled() and disabled() according to d5b525697ddb
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diff
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|
446 '''find disabled extensions from hgext. returns a dict of {name: desc}''' |
14539
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|
447 try: |
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|
448 from hgext import __index__ |
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|
449 return dict((name, gettext(desc)) |
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|
450 for name, desc in __index__.docs.iteritems() |
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changeset
|
451 if name not in _order) |
21229
54d7657d7d1e
setup.py, make: avoid problems with outdated, existing hgext/__index__.py*
Thomas Arendsen Hein <thomas@intevation.de>
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changeset
|
452 except (ImportError, AttributeError): |
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|
453 pass |
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|
454 |
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|
455 paths = _disabledpaths() |
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changeset
|
456 if not paths: |
16709
9eca39a91964
extensions.disabled: return {} instead of None no extensions are disabled
Augie Fackler <raf@durin42.com>
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16667
diff
changeset
|
457 return {} |
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|
458 |
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changeset
|
459 exts = {} |
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extensions: refactor disabled()
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changeset
|
460 for name, path in paths.iteritems(): |
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changeset
|
461 doc = _disabledhelp(path) |
14316
d5b525697ddb
extensions: drop maxlength from enabled and disabled
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14079
diff
changeset
|
462 if doc: |
30306
5581b294f3c6
help: show help for disabled extensions (issue5228)
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parents:
30058
diff
changeset
|
463 exts[name] = doc.splitlines()[0] |
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extensions: move extensions listing functions from mercurial.help
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|
464 |
14316
d5b525697ddb
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diff
changeset
|
465 return exts |
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|
466 |
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|
467 def disabledext(name): |
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|
468 '''find a specific disabled extension from hgext. returns desc''' |
14539
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diff
changeset
|
469 try: |
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changeset
|
470 from hgext import __index__ |
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|
471 if name in _order: # enabled |
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|
472 return |
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|
473 else: |
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|
474 return gettext(__index__.docs.get(name)) |
21229
54d7657d7d1e
setup.py, make: avoid problems with outdated, existing hgext/__index__.py*
Thomas Arendsen Hein <thomas@intevation.de>
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20645
diff
changeset
|
475 except (ImportError, AttributeError): |
14539
558ec14ba6be
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|
476 pass |
558ec14ba6be
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Yuya Nishihara <yuya@tcha.org>
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diff
changeset
|
477 |
10364
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changeset
|
478 paths = _disabledpaths() |
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Brodie Rao <me+hg@dackz.net>
parents:
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479 if name in paths: |
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480 return _disabledhelp(paths[name]) |
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481 |
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482 def disabledcmd(ui, cmd, strict=False): |
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483 '''import disabled extensions until cmd is found. |
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484 returns (cmdname, extname, module)''' |
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485 |
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486 paths = _disabledpaths(strip_init=True) |
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487 if not paths: |
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488 raise error.UnknownCommand(cmd) |
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489 |
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490 def findcmd(cmd, name, path): |
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491 try: |
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492 mod = loadpath(path, 'hgext.%s' % name) |
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493 except Exception: |
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494 return |
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495 try: |
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496 aliases, entry = cmdutil.findcmd(cmd, |
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497 getattr(mod, 'cmdtable', {}), strict) |
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498 except (error.AmbiguousCommand, error.UnknownCommand): |
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499 return |
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500 except Exception: |
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501 ui.warn(_('warning: error finding commands in %s\n') % path) |
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502 ui.traceback() |
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503 return |
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504 for c in aliases: |
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505 if c.startswith(cmd): |
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506 cmd = c |
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507 break |
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508 else: |
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509 cmd = aliases[0] |
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510 return (cmd, name, mod) |
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511 |
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512 ext = None |
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513 # first, search for an extension with the same name as the command |
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514 path = paths.pop(cmd, None) |
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515 if path: |
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516 ext = findcmd(cmd, cmd, path) |
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517 if not ext: |
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518 # otherwise, interrogate each extension until there's a match |
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519 for name, path in paths.iteritems(): |
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520 ext = findcmd(cmd, name, path) |
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521 if ext: |
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522 break |
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523 if ext and 'DEPRECATED' not in ext.__doc__: |
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524 return ext |
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525 |
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526 raise error.UnknownCommand(cmd) |
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527 |
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528 def enabled(shortname=True): |
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529 '''return a dict of {name: desc} of extensions''' |
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530 exts = {} |
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531 for ename, ext in extensions(): |
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532 doc = (gettext(ext.__doc__) or _('(no help text available)')) |
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533 if shortname: |
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534 ename = ename.split('.')[-1] |
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535 exts[ename] = doc.splitlines()[0].strip() |
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536 |
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537 return exts |
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538 |
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539 def notloaded(): |
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540 '''return short names of extensions that failed to load''' |
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541 return [name for name, mod in _extensions.iteritems() if mod is None] |
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542 |
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543 def moduleversion(module): |
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544 '''return version information from given module as a string''' |
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545 if (util.safehasattr(module, 'getversion') |
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546 and callable(module.getversion)): |
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547 version = module.getversion() |
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548 elif util.safehasattr(module, '__version__'): |
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549 version = module.__version__ |
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550 else: |
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551 version = '' |
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552 if isinstance(version, (list, tuple)): |
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553 version = '.'.join(str(o) for o in version) |
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554 return version |
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555 |
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556 def ismoduleinternal(module): |
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557 exttestedwith = getattr(module, 'testedwith', None) |
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558 return exttestedwith == "ships-with-hg-core" |