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module Rails
module Plugin
class Locator
include Enumerable
attr_reader :initializer
def initialize(initializer)
@initializer = initializer
end
def plugins
located_plugins.select(&:enabled?).sort
end
def each(&block)
plugins.each(&block)
end
def plugin_names
plugins.map(&:name)
end
private
def located_plugins
raise "The `located_plugins' method must be defined by concrete subclasses of #{self.class}"
end
end
class FileSystemLocator < Locator
private
def located_plugins
returning locate_plugins do |loaders|
ensure_all_registered_plugins_are_loaded!(loaders)
end
end
def locate_plugins
initializer.configuration.plugin_paths.flatten.inject([]) do |plugins, path|
plugins.concat locate_plugins_under(path)
plugins
end.flatten
end
def ensure_all_registered_plugins_are_loaded!(loaders)
registered_plugins = initializer.configuration.plugins
unless registered_plugins.nil? || registered_plugins.empty?
missing_plugins = registered_plugins - loaders.map(&:name)
unless missing_plugins.empty?
raise LoadError, "Could not locate the following plugins: #{missing_plugins.inspect}"
end
end
end
# This starts at the base path looking for directories that pass the plugin_path? test of the Plugin::Loader.
# Since plugins can be nested arbitrarily deep within an unspecified number of intermediary directories,
# this method runs recursively until it finds a plugin directory.
#
# e.g.
#
# locate_plugins_under('vendor/plugins/acts/acts_as_chunky_bacon')
# => 'acts_as_chunky_bacon'
def locate_plugins_under(base_path)
Dir.glob(File.join(base_path, '*')).inject([]) do |plugins, path|
plugin_loader = initializer.configuration.plugin_loader.new(initializer, path)
if plugin_loader.plugin_path? && plugin_loader.enabled?
plugins << plugin_loader
elsif File.directory?(path)
plugins.concat locate_plugins_under(path)
end
plugins
end
end
end
end
end
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