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module Rails
module Plugin
class Locater
include Enumerable
attr_reader :initializer
def initialize(initializer)
@initializer = initializer
end
def plugins
if !explicit_plugin_loading_order?
# We don't care about which plugins get loaded or in what order they are loaded
# so we load 'em all in a reliable order
located_plugins.sort
elsif !registered_plugins.empty?
registered_plugins.inject([]) do |plugins, registered_plugin|
report_plugin_missing!(registered_plugin) unless plugin = locate_registered_plugin(registered_plugin)
plugins << plugin
end
else
[]
end
end
def each(&block)
plugins.each(&block)
end
def plugin_names
plugins.map {|plugin| plugin.name}
end
private
def locate_registered_plugin(registered_plugin)
located_plugins.detect {|plugin| plugin.name == registered_plugin }
end
def report_plugin_missing!(name)
raise LoadError, "Cannot find the plugin you registered called '#{name}'!"
end
def explicit_plugin_loading_order?
!registered_plugins.nil?
end
# The plugins that have been explicitly listed with config.plugins. If this list is nil
# then it means the client does not care which plugins or in what order they are loaded,
# so we load all in alphabetical order. If it is an empty array, we load no plugins, if it is
# non empty, we load the named plugins in the order specified.
def registered_plugins
initializer.configuration.plugins
end
def located_plugins
# We cache this as locate_plugins_under on the entire set of plugin directories could
# be potentially expensive
@located_plugins ||=
begin
initializer.configuration.plugin_paths.flatten.inject([]) do |plugins, path|
plugins.concat locate_plugins_under(path)
plugins
end.flatten
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?
plugins << plugin_loader if plugin_loader.enabled?
elsif File.directory?(path)
plugins.concat locate_plugins_under(path)
end
plugins
end
end
end
end
end
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