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1 | 1 | # encoding: utf-8 |
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2 | 2 | """A class for managing IPython extensions. |
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3 | 3 | |
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4 | 4 | Authors: |
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5 | 5 | |
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6 | 6 | * Brian Granger |
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7 | 7 | """ |
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8 | 8 | |
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9 | 9 | #----------------------------------------------------------------------------- |
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10 | 10 | # Copyright (C) 2010-2011 The IPython Development Team |
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11 | 11 | # |
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12 | 12 | # Distributed under the terms of the BSD License. The full license is in |
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13 | 13 | # the file COPYING, distributed as part of this software. |
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14 | 14 | #----------------------------------------------------------------------------- |
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15 | 15 | |
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16 | 16 | #----------------------------------------------------------------------------- |
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17 | 17 | # Imports |
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18 | 18 | #----------------------------------------------------------------------------- |
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19 | 19 | |
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20 | 20 | import os |
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21 | 21 | from shutil import copyfile |
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22 | 22 | import sys |
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23 | 23 | from urllib import urlretrieve |
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24 | 24 | from urlparse import urlparse |
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25 | 25 | |
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26 | 26 | from IPython.config.configurable import Configurable |
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27 | 27 | from IPython.utils.traitlets import Instance |
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28 | 28 | |
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29 | 29 | #----------------------------------------------------------------------------- |
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30 | 30 | # Main class |
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31 | 31 | #----------------------------------------------------------------------------- |
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32 | 32 | |
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33 | 33 | class ExtensionManager(Configurable): |
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34 | 34 | """A class to manage IPython extensions. |
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35 | 35 | |
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36 | 36 | An IPython extension is an importable Python module that has |
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37 | 37 | a function with the signature:: |
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38 | 38 | |
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39 | 39 | def load_ipython_extension(ipython): |
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40 | 40 | # Do things with ipython |
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41 | 41 | |
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42 | 42 | This function is called after your extension is imported and the |
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43 | 43 | currently active :class:`InteractiveShell` instance is passed as |
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44 | 44 | the only argument. You can do anything you want with IPython at |
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45 | 45 | that point, including defining new magic and aliases, adding new |
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46 | 46 | components, etc. |
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47 | 47 | |
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48 | 48 | The :func:`load_ipython_extension` will be called again is you |
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49 | 49 | load or reload the extension again. It is up to the extension |
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50 | 50 | author to add code to manage that. |
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51 | 51 | |
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52 | 52 | You can put your extension modules anywhere you want, as long as |
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53 | 53 | they can be imported by Python's standard import mechanism. However, |
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54 | 54 | to make it easy to write extensions, you can also put your extensions |
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55 | 55 | in ``os.path.join(self.ipython_dir, 'extensions')``. This directory |
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56 | 56 | is added to ``sys.path`` automatically. |
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57 | 57 | """ |
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58 | 58 | |
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59 | 59 | shell = Instance('IPython.core.interactiveshell.InteractiveShellABC') |
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60 | 60 | |
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61 | 61 | def __init__(self, shell=None, config=None): |
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62 | 62 | super(ExtensionManager, self).__init__(shell=shell, config=config) |
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63 | 63 | self.shell.on_trait_change( |
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64 | 64 | self._on_ipython_dir_changed, 'ipython_dir' |
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65 | 65 | ) |
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66 | 66 | self.loaded = set() |
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67 | 67 | |
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68 | 68 | def __del__(self): |
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69 | 69 | self.shell.on_trait_change( |
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70 | 70 | self._on_ipython_dir_changed, 'ipython_dir', remove=True |
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71 | 71 | ) |
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72 | 72 | |
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73 | 73 | @property |
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74 | 74 | def ipython_extension_dir(self): |
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75 | 75 | return os.path.join(self.shell.ipython_dir, u'extensions') |
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76 | 76 | |
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77 | 77 | def _on_ipython_dir_changed(self): |
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78 | 78 | if not os.path.isdir(self.ipython_extension_dir): |
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79 | 79 | os.makedirs(self.ipython_extension_dir, mode = 0o777) |
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80 | 80 | |
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81 | 81 | def load_extension(self, module_str): |
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82 | 82 | """Load an IPython extension by its module name. |
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83 | 83 | |
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84 | 84 | If :func:`load_ipython_extension` returns anything, this function |
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85 | 85 | will return that object. |
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86 | 86 | """ |
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87 | 87 | from IPython.utils.syspathcontext import prepended_to_syspath |
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88 | 88 | |
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89 | 89 | if module_str not in sys.modules: |
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90 | 90 | with prepended_to_syspath(self.ipython_extension_dir): |
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91 | 91 | __import__(module_str) |
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92 | 92 | mod = sys.modules[module_str] |
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93 | 93 | if self._call_load_ipython_extension(mod): |
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94 | 94 | self.loaded.add(module_str) |
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95 | 95 | |
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96 | 96 | def unload_extension(self, module_str): |
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97 | 97 | """Unload an IPython extension by its module name. |
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98 | 98 | |
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99 | 99 | This function looks up the extension's name in ``sys.modules`` and |
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100 | 100 | simply calls ``mod.unload_ipython_extension(self)``. |
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101 | 101 | """ |
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102 | 102 | if module_str in sys.modules: |
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103 | 103 | mod = sys.modules[module_str] |
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104 | 104 | if self._call_unload_ipython_extension(mod): |
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105 | 105 | self.loaded.discard(module_str) |
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106 | 106 | |
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107 | 107 | def reload_extension(self, module_str): |
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108 | 108 | """Reload an IPython extension by calling reload. |
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109 | 109 | |
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110 | 110 | If the module has not been loaded before, |
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111 | 111 | :meth:`InteractiveShell.load_extension` is called. Otherwise |
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112 | 112 | :func:`reload` is called and then the :func:`load_ipython_extension` |
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113 | 113 | function of the module, if it exists is called. |
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114 | 114 | """ |
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115 | 115 | from IPython.utils.syspathcontext import prepended_to_syspath |
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116 | 116 | |
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117 | with prepended_to_syspath(self.ipython_extension_dir): | |
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118 | if module_str in sys.modules: | |
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119 |
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117 | if (module_str in self.loaded) and (module_str in sys.modules): | |
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118 | self.unload_extension(module_str) | |
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119 | mod = sys.modules[module_str] | |
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120 | with prepended_to_syspath(self.ipython_extension_dir): | |
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120 | 121 | reload(mod) |
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121 |
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122 | else: | |
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123 | self.load_extension(module_str) | |
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122 | if self._call_load_ipython_extension(mod): | |
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123 | self.loaded.add(module_str) | |
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124 | else: | |
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125 | self.load_extension(module_str) | |
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124 | 126 | |
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125 | 127 | def _call_load_ipython_extension(self, mod): |
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126 | 128 | if hasattr(mod, 'load_ipython_extension'): |
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127 | 129 | mod.load_ipython_extension(self.shell) |
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128 | 130 | return True |
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129 | 131 | |
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130 | 132 | def _call_unload_ipython_extension(self, mod): |
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131 | 133 | if hasattr(mod, 'unload_ipython_extension'): |
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132 | 134 | mod.unload_ipython_extension(self.shell) |
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133 | 135 | return True |
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134 | 136 | |
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135 | 137 | def install_extension(self, url, filename=None): |
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136 | 138 | """Download and install an IPython extension. |
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137 | 139 | |
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138 | 140 | If filename is given, the file will be so named (inside the extension |
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139 | 141 | directory). Otherwise, the name from the URL will be used. The file must |
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140 | 142 | have a .py or .zip extension; otherwise, a ValueError will be raised. |
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141 | 143 | |
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142 | 144 | Returns the full path to the installed file. |
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143 | 145 | """ |
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144 | 146 | # Ensure the extension directory exists |
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145 | 147 | if not os.path.isdir(self.ipython_extension_dir): |
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146 | 148 | os.makedirs(self.ipython_extension_dir, mode = 0o777) |
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147 | 149 | |
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148 | 150 | if os.path.isfile(url): |
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149 | 151 | src_filename = os.path.basename(url) |
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150 | 152 | copy = copyfile |
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151 | 153 | else: |
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152 | 154 | src_filename = urlparse(url).path.split('/')[-1] |
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153 | 155 | copy = urlretrieve |
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154 | 156 | |
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155 | 157 | if filename is None: |
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156 | 158 | filename = src_filename |
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157 | 159 | if os.path.splitext(filename)[1] not in ('.py', '.zip'): |
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158 | 160 | raise ValueError("The file must have a .py or .zip extension", filename) |
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159 | 161 | |
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160 | 162 | filename = os.path.join(self.ipython_extension_dir, filename) |
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161 | 163 | copy(url, filename) |
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162 | 164 | return filename |
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