Mercurial > piecrust2

annotate piecrust/plugins/base.py @ 746:0fdf1e43bf92

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data: Make the blog provider give usable data to the year archive routes.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 05 Jun 2016 00:01:40 -0700
parents ab5c6a8ae90a
children bf9f4e55f751
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5dbab01daaba plugins: First pass for a working plugin loader functionality.
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diff changeset
1 import logging
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2 import importlib
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3
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4
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5 logger = logging.getLogger(__name__)
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7
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8 class PieCrustPlugin(object):
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9 def getFormatters(self):
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10 return []
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11
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12 def getTemplateEngines(self):
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13 return []
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14
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15 def getDataProviders(self):
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16 return []
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17
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18 def getProcessors(self):
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19 return []
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20
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21 def getImporters(self):
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22 return []
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23
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24 def getCommands(self):
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25 return []
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26
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27 def getCommandExtensions(self):
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28 return []
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29
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30 def getBakerAssistants(self):
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31 return []
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32
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33 def getSources(self):
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34 return []
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35
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36 def getPageGenerators(self):
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37 return []
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38
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39 def getPublishers(self):
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40 return []
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41
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42 def initialize(self, app):
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43 pass
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44
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45
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46 class PluginLoader(object):
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47 def __init__(self, app):
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48 self.app = app
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49 self._plugins = None
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50 self._componentCache = {}
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51
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52 @property
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53 def plugins(self):
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54 self._ensureLoaded()
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55 return self._plugins
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56
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57 def getFormatters(self):
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58 return self._getPluginComponents(
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59 'getFormatters',
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60 initialize=True, register_timer=True,
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61 order_key=lambda f: f.priority)
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62
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63 def getTemplateEngines(self):
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64 return self._getPluginComponents(
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65 'getTemplateEngines',
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66 initialize=True, register_timer=True)
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67
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68 def getDataProviders(self):
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69 return self._getPluginComponents('getDataProviders')
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70
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71 def getProcessors(self):
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72 return self._getPluginComponents(
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73 'getProcessors',
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74 initialize=True, register_timer=True,
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75 order_key=lambda p: p.priority)
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76
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77 def getImporters(self):
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78 return self._getPluginComponents('getImporters')
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79
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80 def getCommands(self):
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81 return self._getPluginComponents('getCommands')
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82
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83 def getCommandExtensions(self):
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84 return self._getPluginComponents('getCommandExtensions')
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85
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86 def getBakerAssistants(self):
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87 return self._getPluginComponents('getBakerAssistants')
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88
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89 def getSources(self):
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90 return self._getPluginComponents('getSources')
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91
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92 def getPageGenerators(self):
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93 return self._getPluginComponents('getPageGenerators')
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94
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95 def getPublishers(self):
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96 return self._getPluginComponents('getPublishers')
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97
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98 def _ensureLoaded(self):
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99 if self._plugins is not None:
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100 return
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101
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102 from piecrust.plugins.builtin import BuiltInPlugin
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103 self._plugins = [BuiltInPlugin()]
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104
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105 to_install = self.app.config.get('site/plugins')
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106 if to_install:
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107 for name in to_install:
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108 plugin = self._loadPlugin(name)
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109 self._plugins.append(plugin)
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110
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111 for plugin in self._plugins:
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112 plugin.initialize(self.app)
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113
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114 def _loadPlugin(self, plugin_name):
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115 try:
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116 mod = importlib.import_module('piecrust_' + plugin_name)
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117 except ImportError as ex:
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118 logger.error("Failed to load plugin '%s'." % plugin_name)
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119 logger.error(ex)
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120 return
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121
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122 plugin_class = getattr(mod, '__piecrust_plugin__', None)
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123 if plugin_class is None:
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124 logger.error("Plugin '%s' doesn't specify any "
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125 "`__piecrust_plugin__` class." % plugin_name)
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126 return
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127
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128 try:
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129 plugin = plugin_class()
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130 except Exception as ex:
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131 logger.error("Failed to create plugin '%s': %s" %
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132 (plugin_name, ex))
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133 return
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134
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135 return plugin
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136
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137 def _getPluginComponents(self, name, *,
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138 initialize=False, register_timer=False,
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139 order_key=None):
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140 if name in self._componentCache:
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141 return self._componentCache[name]
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142
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143 all_components = []
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144 for plugin in self.plugins:
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145 plugin_components = getattr(plugin, name)()
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146 all_components += plugin_components
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147
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148 if initialize:
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149 for comp in plugin_components:
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150 comp.initialize(self.app)
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151
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152 if register_timer:
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153 for comp in plugin_components:
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154 self.app.env.registerTimer(comp.__class__.__name__)
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155
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343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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156 if order_key is not None:
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157 all_components.sort(key=order_key)
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158
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159 self._componentCache[name] = all_components
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160 return all_components
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161