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1 | # encoding: utf-8 |
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1 | # encoding: utf-8 | |
2 | """A class for managing IPython extensions. |
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2 | """A class for managing IPython extensions. | |
3 |
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3 | |||
4 | Authors: |
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4 | Authors: | |
5 |
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5 | |||
6 | * Brian Granger |
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6 | * Brian Granger | |
7 | """ |
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7 | """ | |
8 |
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8 | |||
9 | #----------------------------------------------------------------------------- |
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9 | #----------------------------------------------------------------------------- | |
10 | # Copyright (C) 2010-2011 The IPython Development Team |
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10 | # Copyright (C) 2010-2011 The IPython Development Team | |
11 | # |
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11 | # | |
12 | # Distributed under the terms of the BSD License. The full license is in |
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12 | # Distributed under the terms of the BSD License. The full license is in | |
13 | # the file COPYING, distributed as part of this software. |
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13 | # the file COPYING, distributed as part of this software. | |
14 | #----------------------------------------------------------------------------- |
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14 | #----------------------------------------------------------------------------- | |
15 |
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15 | |||
16 | #----------------------------------------------------------------------------- |
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16 | #----------------------------------------------------------------------------- | |
17 | # Imports |
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17 | # Imports | |
18 | #----------------------------------------------------------------------------- |
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18 | #----------------------------------------------------------------------------- | |
19 |
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19 | |||
20 | import os |
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20 | import os | |
21 | from shutil import copyfile |
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21 | from shutil import copyfile | |
22 | import sys |
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22 | import sys | |
23 | from urllib import urlretrieve |
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23 | from urllib import urlretrieve | |
24 | from urlparse import urlparse |
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24 | from urlparse import urlparse | |
25 |
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25 | |||
26 | from IPython.config.configurable import Configurable |
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26 | from IPython.config.configurable import Configurable | |
27 | from IPython.utils.traitlets import Instance |
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27 | from IPython.utils.traitlets import Instance | |
28 |
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28 | |||
29 | #----------------------------------------------------------------------------- |
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29 | #----------------------------------------------------------------------------- | |
30 | # Main class |
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30 | # Main class | |
31 | #----------------------------------------------------------------------------- |
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31 | #----------------------------------------------------------------------------- | |
32 |
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32 | |||
33 | class ExtensionManager(Configurable): |
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33 | class ExtensionManager(Configurable): | |
34 | """A class to manage IPython extensions. |
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34 | """A class to manage IPython extensions. | |
35 |
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35 | |||
36 | An IPython extension is an importable Python module that has |
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36 | An IPython extension is an importable Python module that has | |
37 | a function with the signature:: |
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37 | a function with the signature:: | |
38 |
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38 | |||
39 | def load_ipython_extension(ipython): |
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39 | def load_ipython_extension(ipython): | |
40 | # Do things with ipython |
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40 | # Do things with ipython | |
41 |
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41 | |||
42 | This function is called after your extension is imported and the |
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42 | This function is called after your extension is imported and the | |
43 | currently active :class:`InteractiveShell` instance is passed as |
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43 | currently active :class:`InteractiveShell` instance is passed as | |
44 | the only argument. You can do anything you want with IPython at |
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44 | the only argument. You can do anything you want with IPython at | |
45 | that point, including defining new magic and aliases, adding new |
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45 | that point, including defining new magic and aliases, adding new | |
46 | components, etc. |
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46 | components, etc. | |
47 |
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47 | |||
48 | The :func:`load_ipython_extension` will be called again is you |
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48 | The :func:`load_ipython_extension` will be called again is you | |
49 | load or reload the extension again. It is up to the extension |
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49 | load or reload the extension again. It is up to the extension | |
50 | author to add code to manage that. |
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50 | author to add code to manage that. | |
51 |
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51 | |||
52 | You can put your extension modules anywhere you want, as long as |
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52 | You can put your extension modules anywhere you want, as long as | |
53 | they can be imported by Python's standard import mechanism. However, |
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53 | they can be imported by Python's standard import mechanism. However, | |
54 | to make it easy to write extensions, you can also put your extensions |
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54 | to make it easy to write extensions, you can also put your extensions | |
55 | in ``os.path.join(self.ipython_dir, 'extensions')``. This directory |
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55 | in ``os.path.join(self.ipython_dir, 'extensions')``. This directory | |
56 | is added to ``sys.path`` automatically. |
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56 | is added to ``sys.path`` automatically. | |
57 | """ |
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57 | """ | |
58 |
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58 | |||
59 | shell = Instance('IPython.core.interactiveshell.InteractiveShellABC') |
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59 | shell = Instance('IPython.core.interactiveshell.InteractiveShellABC') | |
60 |
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60 | |||
61 | def __init__(self, shell=None, config=None): |
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61 | def __init__(self, shell=None, config=None): | |
62 | super(ExtensionManager, self).__init__(shell=shell, config=config) |
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62 | super(ExtensionManager, self).__init__(shell=shell, config=config) | |
63 | self.shell.on_trait_change( |
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63 | self.shell.on_trait_change( | |
64 | self._on_ipython_dir_changed, 'ipython_dir' |
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64 | self._on_ipython_dir_changed, 'ipython_dir' | |
65 | ) |
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65 | ) | |
66 |
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66 | |||
67 | def __del__(self): |
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67 | def __del__(self): | |
68 | self.shell.on_trait_change( |
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68 | self.shell.on_trait_change( | |
69 | self._on_ipython_dir_changed, 'ipython_dir', remove=True |
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69 | self._on_ipython_dir_changed, 'ipython_dir', remove=True | |
70 | ) |
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70 | ) | |
71 |
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71 | |||
72 | @property |
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72 | @property | |
73 | def ipython_extension_dir(self): |
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73 | def ipython_extension_dir(self): | |
74 | return os.path.join(self.shell.ipython_dir, u'extensions') |
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74 | return os.path.join(self.shell.ipython_dir, u'extensions') | |
75 |
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75 | |||
76 | def _on_ipython_dir_changed(self): |
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76 | def _on_ipython_dir_changed(self): | |
77 | if not os.path.isdir(self.ipython_extension_dir): |
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77 | if not os.path.isdir(self.ipython_extension_dir): | |
78 | os.makedirs(self.ipython_extension_dir, mode = 0777) |
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78 | os.makedirs(self.ipython_extension_dir, mode = 0777) | |
79 |
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79 | |||
80 | def load_extension(self, module_str): |
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80 | def load_extension(self, module_str): | |
81 | """Load an IPython extension by its module name. |
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81 | """Load an IPython extension by its module name. | |
82 |
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82 | |||
83 | If :func:`load_ipython_extension` returns anything, this function |
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83 | If :func:`load_ipython_extension` returns anything, this function | |
84 | will return that object. |
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84 | will return that object. | |
85 | """ |
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85 | """ | |
86 | from IPython.utils.syspathcontext import prepended_to_syspath |
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86 | from IPython.utils.syspathcontext import prepended_to_syspath | |
87 |
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87 | |||
88 | if module_str not in sys.modules: |
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88 | if module_str not in sys.modules: | |
89 | with prepended_to_syspath(self.ipython_extension_dir): |
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89 | with prepended_to_syspath(self.ipython_extension_dir): | |
90 | __import__(module_str) |
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90 | __import__(module_str) | |
91 | mod = sys.modules[module_str] |
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91 | mod = sys.modules[module_str] | |
92 | return self._call_load_ipython_extension(mod) |
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92 | return self._call_load_ipython_extension(mod) | |
93 |
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93 | |||
94 | def unload_extension(self, module_str): |
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94 | def unload_extension(self, module_str): | |
95 | """Unload an IPython extension by its module name. |
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95 | """Unload an IPython extension by its module name. | |
96 |
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96 | |||
97 | This function looks up the extension's name in ``sys.modules`` and |
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97 | This function looks up the extension's name in ``sys.modules`` and | |
98 | simply calls ``mod.unload_ipython_extension(self)``. |
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98 | simply calls ``mod.unload_ipython_extension(self)``. | |
99 | """ |
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99 | """ | |
100 | if module_str in sys.modules: |
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100 | if module_str in sys.modules: | |
101 | mod = sys.modules[module_str] |
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101 | mod = sys.modules[module_str] | |
102 | self._call_unload_ipython_extension(mod) |
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102 | self._call_unload_ipython_extension(mod) | |
103 |
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103 | |||
104 | def reload_extension(self, module_str): |
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104 | def reload_extension(self, module_str): | |
105 | """Reload an IPython extension by calling reload. |
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105 | """Reload an IPython extension by calling reload. | |
106 |
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106 | |||
107 | If the module has not been loaded before, |
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107 | If the module has not been loaded before, | |
108 | :meth:`InteractiveShell.load_extension` is called. Otherwise |
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108 | :meth:`InteractiveShell.load_extension` is called. Otherwise | |
109 | :func:`reload` is called and then the :func:`load_ipython_extension` |
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109 | :func:`reload` is called and then the :func:`load_ipython_extension` | |
110 | function of the module, if it exists is called. |
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110 | function of the module, if it exists is called. | |
111 | """ |
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111 | """ | |
112 | from IPython.utils.syspathcontext import prepended_to_syspath |
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112 | from IPython.utils.syspathcontext import prepended_to_syspath | |
113 |
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113 | |||
114 | with prepended_to_syspath(self.ipython_extension_dir): |
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114 | with prepended_to_syspath(self.ipython_extension_dir): | |
115 | if module_str in sys.modules: |
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115 | if module_str in sys.modules: | |
116 | mod = sys.modules[module_str] |
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116 | mod = sys.modules[module_str] | |
117 | reload(mod) |
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117 | reload(mod) | |
118 | self._call_load_ipython_extension(mod) |
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118 | self._call_load_ipython_extension(mod) | |
119 | else: |
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119 | else: | |
120 | self.load_extension(module_str) |
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120 | self.load_extension(module_str) | |
121 |
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121 | |||
122 | def _call_load_ipython_extension(self, mod): |
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122 | def _call_load_ipython_extension(self, mod): | |
123 | if hasattr(mod, 'load_ipython_extension'): |
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123 | if hasattr(mod, 'load_ipython_extension'): | |
124 | return mod.load_ipython_extension(self.shell) |
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124 | return mod.load_ipython_extension(self.shell) | |
125 |
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125 | |||
126 | def _call_unload_ipython_extension(self, mod): |
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126 | def _call_unload_ipython_extension(self, mod): | |
127 | if hasattr(mod, 'unload_ipython_extension'): |
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127 | if hasattr(mod, 'unload_ipython_extension'): | |
128 | return mod.unload_ipython_extension(self.shell) |
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128 | return mod.unload_ipython_extension(self.shell) | |
129 |
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129 | |||
130 | def install_extension(self, url, filename=None): |
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130 | def install_extension(self, url, filename=None): | |
131 | """Download and install an IPython extension. |
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131 | """Download and install an IPython extension. | |
132 |
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132 | |||
133 | If filename is given, the file will be so named (inside the extension |
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133 | If filename is given, the file will be so named (inside the extension | |
134 | directory). Otherwise, the name from the URL will be used. The file must |
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134 | directory). Otherwise, the name from the URL will be used. The file must | |
135 | have a .py or .zip extension; otherwise, a ValueError will be raised. |
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135 | have a .py or .zip extension; otherwise, a ValueError will be raised. | |
136 | """ |
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136 | """ | |
137 | # Ensure the extension directory exists |
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137 | # Ensure the extension directory exists | |
138 | if not os.path.isdir(self.ipython_extension_dir): |
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138 | if not os.path.isdir(self.ipython_extension_dir): | |
139 | os.makedirs(self.ipython_extension_dir, mode = 0777) |
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139 | os.makedirs(self.ipython_extension_dir, mode = 0777) | |
140 |
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140 | |||
141 | if os.path.isfile(url): |
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141 | if os.path.isfile(url): | |
142 | src_filename = os.path.basename(url) |
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142 | src_filename = os.path.basename(url) | |
143 | copy = copyfile |
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143 | copy = copyfile | |
144 | else: |
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144 | else: | |
145 | src_filename = urlparse(url).path.split('/')[-1] |
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145 | src_filename = urlparse(url).path.split('/')[-1] | |
146 | copy = urlretrieve |
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146 | copy = urlretrieve | |
147 |
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147 | |||
148 | if filename is None: |
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148 | if filename is None: | |
149 | filename = src_filename |
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149 | filename = src_filename | |
150 | if os.path.splitext(filename)[1] not in ('.py', '.zip'): |
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150 | if os.path.splitext(filename)[1] not in ('.py', '.zip'): | |
151 | raise ValueError("The file must have a .py or .zip extension", filename) |
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151 | raise ValueError("The file must have a .py or .zip extension", filename) | |
152 |
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152 | |||
153 | filename = os.path.join(self.ipython_extension_dir, filename) |
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153 | filename = os.path.join(self.ipython_extension_dir, filename) | |
154 |
return |
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154 | return copy(url, filename) |
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