diff options
Diffstat (limited to 'railties/lib/plugin')
| -rw-r--r-- | railties/lib/plugin/loader.rb | 95 | ||||
| -rw-r--r-- | railties/lib/plugin/locater.rb | 88 |
2 files changed, 183 insertions, 0 deletions
diff --git a/railties/lib/plugin/loader.rb b/railties/lib/plugin/loader.rb new file mode 100644 index 0000000000..c3116d84c5 --- /dev/null +++ b/railties/lib/plugin/loader.rb @@ -0,0 +1,95 @@ +module Rails + module Plugin + class Loader + include Comparable + attr_reader :initializer, :directory, :name + + class << self + def load(*args) + new(*args).load + end + end + + def initialize(initializer, directory) + @initializer = initializer + @directory = directory + @name = File.basename(directory) + end + + def load + return false if loaded? + report_nonexistant_or_empty_plugin! + add_to_load_path! + register_plugin_as_loaded + evaluate + true + end + + def loaded? + initializer.loaded_plugins.include?(name) + end + + def plugin_path? + File.directory?(directory) && (has_lib_directory? || has_init_file?) + end + + def enabled? + config.plugins.nil? || config.plugins.include?(name) + end + + private + def report_nonexistant_or_empty_plugin! + raise LoadError, "No such plugin: #{directory}" unless plugin_path? + end + + def lib_path + File.join(directory, 'lib') + end + + def init_path + File.join(directory, 'init.rb') + end + + def has_lib_directory? + File.directory?(lib_path) + end + + def has_init_file? + File.file?(init_path) + end + + def add_to_load_path! + # Add lib to load path *after* the application lib, to allow + # application libraries to override plugin libraries. + if has_lib_directory? + application_lib_index = $LOAD_PATH.index(application_library_path) || 0 + $LOAD_PATH.insert(application_lib_index + 1, lib_path) + Dependencies.load_paths << lib_path + Dependencies.load_once_paths << lib_path + end + end + + def application_library_path + File.join(RAILS_ROOT, 'lib') + end + + # Allow plugins to reference the current configuration object + def config + initializer.configuration + end + + def register_plugin_as_loaded + initializer.loaded_plugins << name + end + + # Evaluate in init.rb + def evaluate + silence_warnings { eval(IO.read(init_path), binding, init_path)} if has_init_file? + end + + def <=>(other_plugin_loader) + name <=> other_plugin_loader.name + end + end + end +end diff --git a/railties/lib/plugin/locater.rb b/railties/lib/plugin/locater.rb new file mode 100644 index 0000000000..4a7aa774ee --- /dev/null +++ b/railties/lib/plugin/locater.rb @@ -0,0 +1,88 @@ +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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