Mercurial > piecrust2

annotate piecrust/plugins/base.py @ 1139:cd5267cd23ef

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cm: Update npm modules.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 20 May 2018 22:37:38 -0700
parents 8af2ea1f5c34
children
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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
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6
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7 logger = logging.getLogger(__name__)
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8
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9
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10 class PieCrustPlugin(object):
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11 def getFormatters(self):
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12 return []
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13
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14 def getTemplateEngines(self):
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15 return []
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16
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17 def getTemplateEngineExtensions(self, engine_name):
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18 return []
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19
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20 def getDataProviders(self):
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21 return []
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22
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23 def getProcessors(self):
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24 return []
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25
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26 def getImporters(self):
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27 return []
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28
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29 def getCommands(self):
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30 return []
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31
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32 def getCommandExtensions(self):
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33 return []
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34
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35 def getBakerAssistants(self):
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36 return []
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37
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38 def getSources(self):
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39 return []
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40
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41 def getPipelines(self):
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42 return []
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43
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44 def getPublishers(self):
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45 return []
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46
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47 def getTaskRunners(self):
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48 return []
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49
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50 def initialize(self, app):
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51 pass
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52
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53
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54 class PluginLoader(object):
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55 def __init__(self, app):
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56 self.app = app
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57 self._plugins = None
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58 self._componentCache = {}
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59
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60 @property
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61 def plugins(self):
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62 self._ensureLoaded()
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63 return self._plugins
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64
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65 def getFormatters(self):
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66 return self._getPluginComponents(
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67 'getFormatters',
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68 initialize=True, register_timer=True,
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69 order_key=lambda f: f.priority)
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70
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71 def getTemplateEngines(self):
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72 return self._getPluginComponents(
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73 'getTemplateEngines',
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74 initialize=True, register_timer=True,
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75 register_timer_suffixes=['_segment', '_layout'])
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76
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77 def getTemplateEngineExtensions(self, engine_name):
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78 return self._getPluginComponents('getTemplateEngineExtensions',
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79 engine_name)
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80
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81 def getDataProviders(self):
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82 return self._getPluginComponents('getDataProviders')
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83
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84 def getProcessors(self):
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85 return self._getPluginComponents(
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86 'getProcessors',
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87 initialize=True, register_timer=True,
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88 order_key=lambda p: p.priority)
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89
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90 def getImporters(self):
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91 return self._getPluginComponents('getImporters')
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92
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93 def getCommands(self):
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94 return self._getPluginComponents('getCommands')
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95
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96 def getCommandExtensions(self):
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97 return self._getPluginComponents('getCommandExtensions')
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98
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99 def getBakerAssistants(self):
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100 return self._getPluginComponents('getBakerAssistants')
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101
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102 def getSources(self):
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103 return self._getPluginComponents('getSources')
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104
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105 def getPipelines(self):
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106 return self._getPluginComponents('getPipelines')
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107
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108 def getPublishers(self):
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109 return self._getPluginComponents('getPublishers')
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110
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111 def getTaskRunners(self):
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112 return self._getPluginComponents('getTaskRunners')
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113
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114 def _ensureLoaded(self):
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115 if self._plugins is not None:
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116 return
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117
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118 from piecrust.plugins.builtin import BuiltInPlugin
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119 self._plugins = [BuiltInPlugin()]
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120
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121 to_install = self.app.config.get('site/plugins')
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122 if to_install:
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123 for name in to_install:
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124 plugin = self._loadPlugin(name)
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125 if plugin is not None:
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126 self._plugins.append(plugin)
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127
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128 for plugin in self._plugins:
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129 plugin.initialize(self.app)
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130
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131 def _loadPlugin(self, plugin_name):
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132 mod_name = 'piecrust_%s' % plugin_name
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133 try:
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134 # Import from the current environment.
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135 mod = importlib.import_module(mod_name)
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136 except ImportError as ex:
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137 mod = None
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138
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139 if mod is None:
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140 # Import as a loose Python file from the plugins dir.
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141 for plugins_dir in self.app.plugins_dirs:
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142 pfile = os.path.join(plugins_dir, plugin_name + '.py')
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143 if os.path.isfile(pfile):
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144 if sys.version_info[1] >= 5:
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145 # Python 3.5+
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146 from importlib.util import (spec_from_file_location,
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147 module_from_spec)
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148 spec = spec_from_file_location(plugin_name, pfile)
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149 mod = module_from_spec(spec)
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150 spec.loader.exec_module(mod)
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151 sys.modules[mod_name] = mod
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152 else:
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153 # Python 3.4, 3.3.
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154 from importlib.machinery import SourceFileLoader
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155 mod = SourceFileLoader(
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156 plugin_name, pfile).load_module()
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157 sys.modules[mod_name] = mod
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158
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159 if mod is None:
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160 logger.error("Failed to load plugin '%s'." % plugin_name)
303
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161 return
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162
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163 plugin_class = getattr(mod, '__piecrust_plugin__', None)
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164 if plugin_class is None:
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165 logger.error("Plugin '%s' doesn't specify any "
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166 "`__piecrust_plugin__` class." % plugin_name)
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167 return
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168
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169 try:
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170 plugin = plugin_class()
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171 except Exception as ex:
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172 logger.error("Failed to create plugin '%s': %s" %
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173 (plugin_name, ex))
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174 return
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175
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176 return plugin
0
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177
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178 def _getPluginComponents(self, name, *args,
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179 initialize=False,
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180 register_timer=False,
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181 register_timer_suffixes=None,
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182 order_key=None):
0
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183 if name in self._componentCache:
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184 return self._componentCache[name]
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185
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186 all_components = []
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187 for plugin in self.plugins:
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188 plugin_components = getattr(plugin, name)(*args)
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189 # Make sure it's a list in case it was an iterator.
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190 plugin_components = list(plugin_components)
0
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191 all_components += plugin_components
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192
0
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193 if initialize:
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194 for comp in plugin_components:
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195 comp.initialize(self.app)
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196
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197 if register_timer:
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198 for comp in plugin_components:
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199 if not register_timer_suffixes:
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200 self.app.env.stats.registerTimer(
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201 comp.__class__.__name__)
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202 else:
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203 for s in register_timer_suffixes:
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204 self.app.env.stats.registerTimer(
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205 comp.__class__.__name__ + s)
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diff changeset
206
7
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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diff changeset
207 if order_key is not None:
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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diff changeset
208 all_components.sort(key=order_key)
0
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209
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210 self._componentCache[name] = all_components
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211 return all_components
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212