Mercurial > hg
annotate mercurial/demandimport.py @ 24066:afdf5f6ab37a
pager: set an attribute on ui indicating that a pager is active
A subsequent patch will teach the color extension to do different things
depending on whether a pager is active. This patch leaves a breadcrumb
on the ui instance to allow it do that that.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Fri, 06 Feb 2015 12:07:56 -0800 |
parents | 2205d00b6d2b |
children | 2e7804110b14 |
rev | line source |
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1 # demandimport.py - global demand-loading of modules for Mercurial |
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2 # |
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3 # Copyright 2006, 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 ''' |
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9 demandimport - automatic demandloading of modules |
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10 |
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11 To enable this module, do: |
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12 |
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13 import demandimport; demandimport.enable() |
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14 |
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15 Imports of the following forms will be demand-loaded: |
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16 |
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17 import a, b.c |
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18 import a.b as c |
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19 from a import b,c # a will be loaded immediately |
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20 |
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21 These imports will not be delayed: |
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22 |
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23 from a import * |
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24 b = __import__(a) |
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25 ''' |
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26 |
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27 import __builtin__, os, sys |
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28 _origimport = __import__ |
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29 |
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30 nothing = object() |
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31 |
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32 try: |
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33 # Python 3 doesn't have relative imports nor level -1. |
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34 level = -1 |
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35 if sys.version_info[0] >= 3: |
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36 level = 0 |
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37 _origimport(__builtin__.__name__, {}, {}, None, level) |
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38 except TypeError: # no level argument |
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39 def _import(name, globals, locals, fromlist, level): |
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40 "call _origimport with no level argument" |
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41 return _origimport(name, globals, locals, fromlist) |
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42 else: |
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43 _import = _origimport |
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44 |
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45 def _hgextimport(importfunc, name, globals, *args): |
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46 try: |
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47 return importfunc(name, globals, *args) |
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48 except ImportError: |
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49 if not globals: |
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50 raise |
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51 # extensions are loaded with "hgext_" prefix |
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52 hgextname = 'hgext_%s' % name |
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53 nameroot = hgextname.split('.', 1)[0] |
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54 contextroot = globals.get('__name__', '').split('.', 1)[0] |
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55 if nameroot != contextroot: |
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56 raise |
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57 # retry to import with "hgext_" prefix |
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58 return importfunc(hgextname, globals, *args) |
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59 |
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60 class _demandmod(object): |
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61 """module demand-loader and proxy""" |
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62 def __init__(self, name, globals, locals, level=level): |
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63 if '.' in name: |
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64 head, rest = name.split('.', 1) |
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65 after = [rest] |
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66 else: |
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67 head = name |
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68 after = [] |
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69 object.__setattr__(self, "_data", |
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70 (head, globals, locals, after, level)) |
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71 object.__setattr__(self, "_module", None) |
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72 def _extend(self, name): |
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73 """add to the list of submodules to load""" |
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74 self._data[3].append(name) |
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75 def _load(self): |
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76 if not self._module: |
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77 head, globals, locals, after, level = self._data |
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78 mod = _hgextimport(_import, head, globals, locals, None, level) |
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79 # load submodules |
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80 def subload(mod, p): |
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81 h, t = p, None |
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82 if '.' in p: |
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83 h, t = p.split('.', 1) |
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84 if getattr(mod, h, nothing) is nothing: |
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85 setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__)) |
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86 elif t: |
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87 subload(getattr(mod, h), t) |
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88 |
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89 for x in after: |
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90 subload(mod, x) |
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91 |
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92 # are we in the locals dictionary still? |
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93 if locals and locals.get(head) == self: |
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94 locals[head] = mod |
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95 object.__setattr__(self, "_module", mod) |
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96 |
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97 def __repr__(self): |
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98 if self._module: |
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99 return "<proxied module '%s'>" % self._data[0] |
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100 return "<unloaded module '%s'>" % self._data[0] |
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101 def __call__(self, *args, **kwargs): |
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102 raise TypeError("%s object is not callable" % repr(self)) |
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103 def __getattribute__(self, attr): |
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104 if attr in ('_data', '_extend', '_load', '_module'): |
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105 return object.__getattribute__(self, attr) |
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106 self._load() |
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107 return getattr(self._module, attr) |
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108 def __setattr__(self, attr, val): |
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109 self._load() |
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110 setattr(self._module, attr, val) |
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111 |
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112 def _demandimport(name, globals=None, locals=None, fromlist=None, level=level): |
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113 if not locals or name in ignore or fromlist == ('*',): |
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114 # these cases we can't really delay |
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115 return _hgextimport(_import, name, globals, locals, fromlist, level) |
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116 elif not fromlist: |
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117 # import a [as b] |
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118 if '.' in name: # a.b |
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119 base, rest = name.split('.', 1) |
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120 # email.__init__ loading email.mime |
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121 if globals and globals.get('__name__', None) == base: |
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122 return _import(name, globals, locals, fromlist, level) |
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123 # if a is already demand-loaded, add b to its submodule list |
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124 if base in locals: |
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125 if isinstance(locals[base], _demandmod): |
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126 locals[base]._extend(rest) |
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127 return locals[base] |
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128 return _demandmod(name, globals, locals, level) |
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129 else: |
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130 if level != -1: |
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131 # from . import b,c,d or from .a import b,c,d |
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132 return _origimport(name, globals, locals, fromlist, level) |
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133 # from a import b,c,d |
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134 mod = _hgextimport(_origimport, name, globals, locals) |
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135 # recurse down the module chain |
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136 for comp in name.split('.')[1:]: |
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137 if getattr(mod, comp, nothing) is nothing: |
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138 setattr(mod, comp, _demandmod(comp, mod.__dict__, mod.__dict__)) |
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139 mod = getattr(mod, comp) |
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140 for x in fromlist: |
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141 # set requested submodules for demand load |
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142 if getattr(mod, x, nothing) is nothing: |
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143 setattr(mod, x, _demandmod(x, mod.__dict__, locals)) |
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144 return mod |
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145 |
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146 ignore = [ |
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147 '_hashlib', |
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148 '_xmlplus', |
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149 'fcntl', |
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150 'win32com.gen_py', |
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151 '_winreg', # 2.7 mimetypes needs immediate ImportError |
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152 'pythoncom', |
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153 # imported by tarfile, not available under Windows |
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154 'pwd', |
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155 'grp', |
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156 # imported by profile, itself imported by hotshot.stats, |
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157 # not available under Windows |
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158 'resource', |
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160 'gtk', | |
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161 # setuptools' pkg_resources.py expects "from __main__ import x" to |
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162 # raise ImportError if x not defined |
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163 '__main__', |
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164 '_ssl', # conditional imports in the stdlib, issue1964 |
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165 'rfc822', |
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166 'mimetools', |
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167 # setuptools 8 expects this module to explode early when not on windows |
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168 'distutils.msvc9compiler' |
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169 ] |
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170 |
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171 def isenabled(): |
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172 return __builtin__.__import__ == _demandimport |
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173 |
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174 def enable(): |
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175 "enable global demand-loading of modules" |
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176 if os.environ.get('HGDEMANDIMPORT') != 'disable': |
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177 __builtin__.__import__ = _demandimport |
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178 |
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179 def disable(): |
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180 "disable global demand-loading of modules" |
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181 __builtin__.__import__ = _origimport |