The class responsible for keeping track of all loaded plugins, such as filters ({Nanoc::Filter}), data sources ({Nanoc::DataSource}) and VCSes ({Nanoc::Extra::VCS}).
Returns the shared {PluginRegistry} instance, creating it if none exists yet.
@return [Nanoc::PluginRegistry] The shared plugin registry
# File lib/nanoc/base/plugin_registry.rb, line 95 def self.instance @instance ||= self.new end
Creates a new plugin registry. This should usually not be necessary; it is recommended to use the shared instance (obtained from {Nanoc::PluginRegistry.instance}).
# File lib/nanoc/base/plugin_registry.rb, line 102 def initialize @identifiers_to_classes = {} @classes_to_identifiers = {} end
Returns a list of all plugins. The returned list of plugins is an array with array elements in the following format:
{ :class => ..., :superclass => ..., :identifiers => ... }
@return [Array<Hash>] A list of all plugins in the format described
# File lib/nanoc/base/plugin_registry.rb, line 172 def all plugins = [] @identifiers_to_classes.each_pair do |superclass, submap| submap.each_pair do |identifier, klass| # Find existing plugin existing_plugin = plugins.find do |p| p[:class] == klass && p[:superclass] == superclass end if existing_plugin # Add identifier to existing plugin existing_plugin[:identifiers] << identifier existing_plugin[:identifiers] = existing_plugin[:identifiers].sort_by { |s| s.to_s } else # Create new plugin plugins << { :class => klass, :superclass => superclass, :identifiers => [ identifier ] } end end end plugins end
Finds the plugin that is a subclass of the given class and has the given name.
@param [Class] klass The class of the plugin to return
@param [Symbol] name The name of the plugin to return
@return [Class, nil] The plugin with the given name
# File lib/nanoc/base/plugin_registry.rb, line 149 def find(klass, name) @identifiers_to_classes[klass] ||= {} resolve(@identifiers_to_classes[klass][name.to_sym], klass) end
Returns all plugins of the given class.
@param [Class] klass The class of the plugin to return
@return [Enumerable<Class>] A collection of class plugins
# File lib/nanoc/base/plugin_registry.rb, line 159 def find_all(klass) @identifiers_to_classes[klass] ||= {} res = {} @identifiers_to_classes[klass].each_pair { |k,v| res[k] = resolve(v, k) } res end
@param [Class] superclass The superclass of the plugin. For example:
{Nanoc::Filter}, {Nanoc::Extra::VCS}.
@param [Class] klass The class to get the identifiers for.
@return [Array<Symbol>] An array of identifiers for the given class
# File lib/nanoc/base/plugin_registry.rb, line 137 def identifiers_of(superclass, klass) (@classes_to_identifiers[superclass] || {})[name_for_class(klass)] || [] end
@deprecated Use {Nanoc::PluginRegistry#find} instead
# File lib/nanoc/base/plugin_registry.rb, line 200 def named(name) find(self, name) end
Registers the given class as a plugin.
@param [Class] superclass The superclass of the plugin. For example:
{Nanoc::Filter}, {Nanoc::Extra::VCS}.
@param [Class, String] class_or_name The class to register. This can be
a string, in which case it will be automatically converted to a proper class at lookup. For example: `Nanoc::Filters::ERB`, `"Nanoc::Filters::Haml"`.
@param [Symbol] identifiers One or more symbols identifying the class.
For example: `:haml`, :`erb`.
@return [void]
# File lib/nanoc/base/plugin_registry.rb, line 121 def register(superclass, class_or_name, *identifiers) @identifiers_to_classes[superclass] ||= {} @classes_to_identifiers[superclass] ||= {} identifiers.each do |identifier| @identifiers_to_classes[superclass][identifier.to_sym] = class_or_name (@classes_to_identifiers[superclass][name_for_class(class_or_name)] ||= []) << identifier.to_sym end end
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