Mercurial > piecrust2

annotate piecrust/plugins/base.py @ 849:8f8bbb2e70e1

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templating: Template engines can now load extensions directly from plugins.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 27 Apr 2017 20:55:07 -0700
parents 7d83b9484b98
children 4850f8c21b6e 46025a1b5434
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848
7d83b9484b98 plugins: Add support for "ad-hoc" local plugins.
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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 self._plugins.append(plugin)
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121
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122 for plugin in self._plugins:
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123 plugin.initialize(self.app)
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124
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125 def _loadPlugin(self, plugin_name):
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126 mod_name = 'piecrust_%s' % plugin_name
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127 try:
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128 # Import from the current environment.
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129 mod = importlib.import_module(mod_name)
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130 except ImportError as ex:
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131 mod = None
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132
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133 if mod is None:
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134 # Import as a loose Python file from the plugins dir.
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135 pfile = os.path.join(self.app.plugins_dir, plugin_name + '.py')
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136 if os.path.isfile(pfile):
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137 spec = importlib.util.spec_from_file_location(plugin_name,
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138 pfile)
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139 mod = importlib.util.module_from_spec(spec)
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140 spec.loader.exec_module(mod)
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141 sys.modules[mod_name] = mod
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142
7d83b9484b98 plugins: Add support for "ad-hoc" local plugins.
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143 if mod is None:
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144 logger.error("Failed to load plugin '%s'." % plugin_name)
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145 logger.error(ex)
303
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146 return
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147
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148 plugin_class = getattr(mod, '__piecrust_plugin__', None)
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149 if plugin_class is None:
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150 logger.error("Plugin '%s' doesn't specify any "
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151 "`__piecrust_plugin__` class." % plugin_name)
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152 return
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153
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154 try:
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155 plugin = plugin_class()
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156 except Exception as ex:
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157 logger.error("Failed to create plugin '%s': %s" %
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158 (plugin_name, ex))
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159 return
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160
413
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161 return plugin
0
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parents:
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162
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163 def _getPluginComponents(self, name, *args,
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164 initialize=False,
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165 register_timer=False,
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166 register_timer_suffixes=None,
413
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167 order_key=None):
0
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168 if name in self._componentCache:
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169 return self._componentCache[name]
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170
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171 all_components = []
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172 for plugin in self.plugins:
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173 plugin_components = getattr(plugin, name)(*args)
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174 all_components += plugin_components
413
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175
0
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parents:
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176 if initialize:
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177 for comp in plugin_components:
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178 comp.initialize(self.app)
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179
413
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180 if register_timer:
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181 for comp in plugin_components:
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parents: 711
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182 if not register_timer_suffixes:
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parents: 711
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183 self.app.env.registerTimer(comp.__class__.__name__)
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parents: 711
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184 else:
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parents: 711
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185 for s in register_timer_suffixes:
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parents: 711
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186 self.app.env.registerTimer(
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Ludovic Chabant <ludovic@chabant.com>
parents: 711
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187 comp.__class__.__name__ + s)
413
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parents: 312
diff changeset
188
7
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 3
diff changeset
189 if order_key is not None:
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 3
diff changeset
190 all_components.sort(key=order_key)
0
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parents:
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191
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parents:
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192 self._componentCache[name] = all_components
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193 return all_components
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parents:
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194