diff options
Diffstat (limited to 'railties/lib/plugin/loader.rb')
-rw-r--r-- | railties/lib/plugin/loader.rb | 95 |
1 files changed, 95 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 |