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annotate piecrust/plugins/base.py @ 999:46025a1b5434

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plugins: Support multiple customizable plugins directories. Also add support for specifying the theme directory in some customizable paths.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 21 Nov 2017 09:54:56 -0800
parents 8f8bbb2e70e1
children 2e5c5d33d62c
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rev   line source
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1 import os.path
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2 import sys
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3 import logging
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4 import importlib
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5 import importlib.util
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6
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7
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8 logger = logging.getLogger(__name__)
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9
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10
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11 class PieCrustPlugin(object):
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12 def getFormatters(self):
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13 return []
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14
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15 def getTemplateEngines(self):
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16 return []
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17
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18 def getTemplateEngineExtensions(self, engine_name):
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19 return []
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20
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21 def getDataProviders(self):
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22 return []
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23
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24 def getProcessors(self):
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25 return []
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26
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27 def getImporters(self):
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28 return []
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29
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30 def getCommands(self):
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31 return []
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32
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33 def getCommandExtensions(self):
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34 return []
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35
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36 def getBakerAssistants(self):
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37 return []
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38
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39 def getSources(self):
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40 return []
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41
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42 def getPageGenerators(self):
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43 return []
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44
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45 def getPublishers(self):
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46 return []
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47
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48 def initialize(self, app):
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49 pass
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50
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51
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52 class PluginLoader(object):
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53 def __init__(self, app):
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54 self.app = app
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55 self._plugins = None
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56 self._componentCache = {}
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57
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58 @property
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59 def plugins(self):
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60 self._ensureLoaded()
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61 return self._plugins
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62
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63 def getFormatters(self):
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64 return self._getPluginComponents(
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65 'getFormatters',
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66 initialize=True, register_timer=True,
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67 order_key=lambda f: f.priority)
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68
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69 def getTemplateEngines(self):
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70 return self._getPluginComponents(
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71 'getTemplateEngines',
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72 initialize=True, register_timer=True,
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73 register_timer_suffixes=['_segment', '_layout'])
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74
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75 def getTemplateEngineExtensions(self, engine_name):
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76 return self._getPluginComponents('getTemplateEngineExtensions',
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77 engine_name)
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78
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79 def getDataProviders(self):
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80 return self._getPluginComponents('getDataProviders')
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81
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82 def getProcessors(self):
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83 return self._getPluginComponents(
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84 'getProcessors',
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85 initialize=True, register_timer=True,
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86 order_key=lambda p: p.priority)
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87
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88 def getImporters(self):
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89 return self._getPluginComponents('getImporters')
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90
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91 def getCommands(self):
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92 return self._getPluginComponents('getCommands')
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93
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94 def getCommandExtensions(self):
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95 return self._getPluginComponents('getCommandExtensions')
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96
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97 def getBakerAssistants(self):
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98 return self._getPluginComponents('getBakerAssistants')
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99
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100 def getSources(self):
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101 return self._getPluginComponents('getSources')
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102
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103 def getPageGenerators(self):
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104 return self._getPluginComponents('getPageGenerators')
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105
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106 def getPublishers(self):
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107 return self._getPluginComponents('getPublishers')
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108
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109 def _ensureLoaded(self):
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110 if self._plugins is not None:
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111 return
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112
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113 from piecrust.plugins.builtin import BuiltInPlugin
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114 self._plugins = [BuiltInPlugin()]
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115
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116 to_install = self.app.config.get('site/plugins')
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117 if to_install:
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118 for name in to_install:
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119 plugin = self._loadPlugin(name)
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120 if plugin is not None:
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121 self._plugins.append(plugin)
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122
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123 for plugin in self._plugins:
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124 plugin.initialize(self.app)
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125
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126 def _loadPlugin(self, plugin_name):
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127 mod_name = 'piecrust_%s' % plugin_name
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128 try:
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129 # Import from the current environment.
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130 mod = importlib.import_module(mod_name)
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131 except ImportError as ex:
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132 mod = None
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133
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134 if mod is None:
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135 # Import as a loose Python file from the plugins dirs.
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136 for plugins_dir in self.app.plugins_dirs:
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137 pfile = os.path.join(plugins_dir, plugin_name + '.py')
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138 if os.path.isfile(pfile):
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139 spec = importlib.util.spec_from_file_location(plugin_name,
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140 pfile)
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141 mod = importlib.util.module_from_spec(spec)
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142 spec.loader.exec_module(mod)
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143 sys.modules[mod_name] = mod
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144 break
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145
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146 if mod is None:
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147 logger.error("Failed to load plugin '%s'." % plugin_name)
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148 logger.error("Looking in: %s" % self.app.plugins_dirs)
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149 return
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150
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151 plugin_class = getattr(mod, '__piecrust_plugin__', None)
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152 if plugin_class is None:
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153 logger.error("Plugin '%s' doesn't specify any "
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154 "`__piecrust_plugin__` class." % plugin_name)
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155 return
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156
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157 try:
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158 plugin = plugin_class()
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159 except Exception as ex:
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160 logger.error("Failed to create plugin '%s': %s" %
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161 (plugin_name, ex))
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162 return
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163
413
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164 return plugin
0
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165
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166 def _getPluginComponents(self, name, *args,
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167 initialize=False,
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168 register_timer=False,
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169 register_timer_suffixes=None,
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170 order_key=None):
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171 if name in self._componentCache:
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172 return self._componentCache[name]
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173
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174 all_components = []
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175 for plugin in self.plugins:
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176 plugin_components = getattr(plugin, name)(*args)
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177 all_components += plugin_components
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178
0
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179 if initialize:
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180 for comp in plugin_components:
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181 comp.initialize(self.app)
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182
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183 if register_timer:
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184 for comp in plugin_components:
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185 if not register_timer_suffixes:
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186 self.app.env.registerTimer(comp.__class__.__name__)
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187 else:
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188 for s in register_timer_suffixes:
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189 self.app.env.registerTimer(
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190 comp.__class__.__name__ + s)
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191
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192 if order_key is not None:
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193 all_components.sort(key=order_key)
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194
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195 self._componentCache[name] = all_components
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196 return all_components
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197