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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 | # Copyright (c) IPython Development Team. |
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5 | 5 | # Distributed under the terms of the Modified BSD License. |
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6 | 6 | |
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7 | 7 | import os |
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8 | 8 | import os.path |
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9 | 9 | import sys |
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10 | 10 | from importlib import import_module, reload |
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11 | 11 | |
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12 | 12 | from traitlets.config.configurable import Configurable |
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13 | 13 | from IPython.utils.path import ensure_dir_exists |
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14 | 14 | from traitlets import Instance |
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15 | 15 | |
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16 | 16 | |
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17 | 17 | #----------------------------------------------------------------------------- |
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18 | 18 | # Main class |
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19 | 19 | #----------------------------------------------------------------------------- |
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20 | 20 | |
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21 | 21 | BUILTINS_EXTS = {"storemagic": False, "autoreload": False} |
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22 | 22 | |
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23 | 23 | |
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24 | 24 | class ExtensionManager(Configurable): |
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25 | 25 | """A class to manage IPython extensions. |
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26 | 26 | |
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27 | 27 | An IPython extension is an importable Python module that has |
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28 | 28 | a function with the signature:: |
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29 | 29 | |
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30 | 30 | def load_ipython_extension(ipython): |
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31 | 31 | # Do things with ipython |
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32 | 32 | |
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33 | 33 | This function is called after your extension is imported and the |
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34 | 34 | currently active :class:`InteractiveShell` instance is passed as |
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35 | 35 | the only argument. You can do anything you want with IPython at |
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36 | 36 | that point, including defining new magic and aliases, adding new |
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37 | 37 | components, etc. |
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38 | 38 | |
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39 | 39 | You can also optionally define an :func:`unload_ipython_extension(ipython)` |
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40 | 40 | function, which will be called if the user unloads or reloads the extension. |
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41 | 41 | The extension manager will only call :func:`load_ipython_extension` again |
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42 | 42 | if the extension is reloaded. |
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43 | 43 | |
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44 | 44 | You can put your extension modules anywhere you want, as long as |
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45 |
they can be imported by Python's standard import mechanism. |
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46 | to make it easy to write extensions, you can also put your extensions | |
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47 | in ``os.path.join(self.ipython_dir, 'extensions')``. This directory | |
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48 | is added to ``sys.path`` automatically. | |
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45 | they can be imported by Python's standard import mechanism. | |
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49 | 46 | """ |
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50 | 47 | |
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51 | 48 | shell = Instance('IPython.core.interactiveshell.InteractiveShellABC', allow_none=True) |
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52 | 49 | |
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53 | 50 | def __init__(self, shell=None, **kwargs): |
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54 | 51 | super(ExtensionManager, self).__init__(shell=shell, **kwargs) |
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55 | self.shell.observe( | |
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56 | self._on_ipython_dir_changed, names=('ipython_dir',) | |
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57 | ) | |
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58 | 52 | self.loaded = set() |
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59 | 53 | |
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60 | @property | |
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61 | def ipython_extension_dir(self): | |
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62 | return os.path.join(self.shell.ipython_dir, u'extensions') | |
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63 | ||
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64 | def _on_ipython_dir_changed(self, change): | |
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65 | ensure_dir_exists(self.ipython_extension_dir) | |
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66 | ||
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67 | 54 | def load_extension(self, module_str: str): |
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68 | 55 | """Load an IPython extension by its module name. |
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69 | 56 | |
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70 | 57 | Returns the string "already loaded" if the extension is already loaded, |
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71 | 58 | "no load function" if the module doesn't have a load_ipython_extension |
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72 | 59 | function, or None if it succeeded. |
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73 | 60 | """ |
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74 | 61 | try: |
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75 | 62 | return self._load_extension(module_str) |
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76 | 63 | except ModuleNotFoundError: |
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77 | 64 | if module_str in BUILTINS_EXTS: |
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78 | 65 | BUILTINS_EXTS[module_str] = True |
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79 | 66 | return self._load_extension("IPython.extensions." + module_str) |
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80 | 67 | raise |
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81 | 68 | |
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82 | 69 | def _load_extension(self, module_str: str): |
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83 | 70 | if module_str in self.loaded: |
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84 | 71 | return "already loaded" |
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85 | 72 | |
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86 | 73 | assert self.shell is not None |
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87 | 74 | |
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88 | 75 | with self.shell.builtin_trap: |
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89 | 76 | if module_str not in sys.modules: |
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90 | 77 | mod = import_module(module_str) |
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91 | 78 | mod = sys.modules[module_str] |
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92 | 79 | if self._call_load_ipython_extension(mod): |
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93 | 80 | self.loaded.add(module_str) |
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94 | 81 | else: |
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95 | 82 | return "no load function" |
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96 | 83 | |
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97 | 84 | def unload_extension(self, module_str: str): |
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98 | 85 | """Unload an IPython extension by its module name. |
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99 | 86 | |
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100 | 87 | This function looks up the extension's name in ``sys.modules`` and |
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101 | 88 | simply calls ``mod.unload_ipython_extension(self)``. |
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102 | 89 | |
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103 | 90 | Returns the string "no unload function" if the extension doesn't define |
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104 | 91 | a function to unload itself, "not loaded" if the extension isn't loaded, |
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105 | 92 | otherwise None. |
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106 | 93 | """ |
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107 | 94 | if BUILTINS_EXTS.get(module_str, False) is True: |
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108 | 95 | module_str = "IPython.extensions." + module_str |
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109 | 96 | if module_str not in self.loaded: |
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110 | 97 | return "not loaded" |
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111 | 98 | |
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112 | 99 | if module_str in sys.modules: |
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113 | 100 | mod = sys.modules[module_str] |
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114 | 101 | if self._call_unload_ipython_extension(mod): |
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115 | 102 | self.loaded.discard(module_str) |
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116 | 103 | else: |
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117 | 104 | return "no unload function" |
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118 | 105 | |
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119 | 106 | def reload_extension(self, module_str: str): |
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120 | 107 | """Reload an IPython extension by calling reload. |
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121 | 108 | |
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122 | 109 | If the module has not been loaded before, |
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123 | 110 | :meth:`InteractiveShell.load_extension` is called. Otherwise |
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124 | 111 | :func:`reload` is called and then the :func:`load_ipython_extension` |
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125 | 112 | function of the module, if it exists is called. |
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126 | 113 | """ |
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127 | from IPython.utils.syspathcontext import prepended_to_syspath | |
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128 | 114 | |
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129 | 115 | if BUILTINS_EXTS.get(module_str, False) is True: |
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130 | 116 | module_str = "IPython.extensions." + module_str |
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131 | 117 | |
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132 | 118 | if (module_str in self.loaded) and (module_str in sys.modules): |
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133 | 119 | self.unload_extension(module_str) |
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134 | 120 | mod = sys.modules[module_str] |
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135 | with prepended_to_syspath(self.ipython_extension_dir): | |
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136 | reload(mod) | |
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121 | reload(mod) | |
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137 | 122 | if self._call_load_ipython_extension(mod): |
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138 | 123 | self.loaded.add(module_str) |
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139 | 124 | else: |
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140 | 125 | self.load_extension(module_str) |
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141 | 126 | |
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142 | 127 | def _call_load_ipython_extension(self, mod): |
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143 | 128 | if hasattr(mod, 'load_ipython_extension'): |
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144 | 129 | mod.load_ipython_extension(self.shell) |
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145 | 130 | return True |
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146 | 131 | |
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147 | 132 | def _call_unload_ipython_extension(self, mod): |
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148 | 133 | if hasattr(mod, 'unload_ipython_extension'): |
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149 | 134 | mod.unload_ipython_extension(self.shell) |
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150 | 135 | return True |
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