require 'thor' require 'rails/generators/actions' module Rails module Generators class Error < Thor::Error end class Base < Thor::Group include Thor::Actions include Rails::Generators::Actions add_runtime_options! # Automatically sets the source root based on the class name. # def self.source_root @_rails_source_root ||= begin if base_name && generator_name File.expand_path(File.join("../../generators", base_name, generator_name, 'templates'), File.dirname(__FILE__)) end end end # Tries to get the description from a USAGE file one folder above the source # root otherwise uses a default description. # def self.desc(description=nil) return super if description usage = File.expand_path(File.join(source_root, "..", "USAGE")) @desc ||= if File.exist?(usage) File.read(usage) else "Description:\n Create #{base_name.humanize.downcase} files for #{generator_name} generator." end end # Convenience method to get the namespace from the class name. It's the # same as Thor default except that the Generator at the end of the class # is removed. # def self.namespace(name=nil) return super if name @namespace ||= super.sub(/_generator$/, '').sub(/:generators:/, ':') end # Invoke a generator based on the value supplied by the user to the # given option named "name". A class option is created when this method # is invoked and you can set a hash to customize it. # # ==== Examples # # module Rails::Generators # class ControllerGenerator < Base # hook_for :test_framework, :aliases => "-t" # end # end # # The example above will create a test framework option and will invoke # a generator based on the user supplied value. # # For example, if the user invoke the controller generator as: # # ruby script/generate controller Account --test-framework=test_unit # # The controller generator will then try to invoke the following generators: # # "rails:test_unit", "test_unit:controller", "test_unit" # # Notice that "rails:generators:test_unit" could be loaded as well, what # Rails looks for is the first and last parts of the namespace. This is what # allows any test framework to hook into Rails as long as it provides any # of the hooks above. # # ==== Options # # The first and last part used to find the generator to be invoked are # guessed based on class invokes hook_for, as noticed in the example above. # This can be customized with two options: :base and :as. # # Let's suppose you are creating a generator that needs to invoke the # controller generator from test unit. Your first attempt is: # # class AwesomeGenerator < Rails::Generators::Base # hook_for :test_framework # end # # The lookup in this case for test_unit as input is: # # "test_unit:awesome", "test_unit" # # Which is not the desired the lookup. You can change it by providing the # :as option: # # class AwesomeGenerator < Rails::Generators::Base # hook_for :test_framework, :as => :controller # end # # And now it will lookup at: # # "test_unit:controller", "test_unit" # # Similarly, if you want it to also lookup in the rails namespace, you just # need to provide the :base value: # # class AwesomeGenerator < Rails::Generators::Base # hook_for :test_framework, :in => :rails, :as => :controller # end # # And the lookup is exactly the same as previously: # # "rails:test_unit", "test_unit:controller", "test_unit" # # ==== Switches # # All hooks come with switches for user interface. If the user don't want # to use any test framework, he can do: # # ruby script/generate controller Account --skip-test-framework # # Or similarly: # # ruby script/generate controller Account --no-test-framework # # ==== Boolean hooks # # In some cases, you want to provide a boolean hook. For example, webrat # developers might want to have webrat available on controller generator. # This can be achieved as: # # Rails::Generators::ControllerGenerator.hook_for :webrat, :type => :boolean # # Then, if you want, webrat to be invoked, just supply: # # ruby script/generate controller Account --webrat # # The hooks lookup is similar as above: # # "rails:generators:webrat", "webrat:generators:controller", "webrat" # # ==== Custom invocations # # You can also supply a block to hook_for to customize how the hook is # going to be invoked. The block receives two arguments, an instance # of the current class and the klass to be invoked. # # For example, in the resource generator, the controller should be invoked # with a pluralized class name. But by default it is invoked with the same # name as the resource generator, which is singular. To change this, we # can give a block to customize how the controller can be invoked. # # hook_for :resource_controller do |instance, controller| # instance.invoke controller, [ instance.name.pluralize ] # end # def self.hook_for(*names, &block) options = names.extract_options! in_base = options.delete(:in) || base_name as_hook = options.delete(:as) || generator_name names.each do |name| defaults = if options[:type] == :boolean { } elsif [true, false].include?(default_value_for_option(name, options)) { :banner => "" } else { :desc => "#{name.to_s.humanize} to be invoked", :banner => "NAME" } end unless class_options.key?(name) class_option(name, defaults.merge!(options)) end hooks[name] = [ in_base, as_hook ] invoke_from_option(name, options, &block) end end # Remove a previously added hook. # # ==== Examples # # remove_hook_for :orm # def self.remove_hook_for(*names) remove_invocation(*names) names.each do |name| hooks.delete(name) end end # Make class option aware of Rails::Generators.options and Rails::Generators.aliases. # def self.class_option(name, options={}) #:nodoc: options[:desc] = "Indicates when to generate #{name.to_s.humanize.downcase}" unless options.key?(:desc) options[:aliases] = default_aliases_for_option(name, options) options[:default] = default_value_for_option(name, options) super(name, options) end # Cache source root and add lib/generators/base/generator/templates to # source paths. # def self.inherited(base) #:nodoc: super # Cache source root, we need to do this, since __FILE__ is a relative value # and can point to wrong directions when inside an specified directory. base.source_root if base.name && base.name !~ /Base$/ Rails::Generators.subclasses << base if defined?(Rails.root) && Rails.root path = File.expand_path(File.join(Rails.root, 'lib', 'templates')) if base.name.include?('::') base.source_paths << File.join(path, base.base_name, base.generator_name) else base.source_paths << File.join(path, base.generator_name) end end end end protected # Check whether the given class names are already taken by user # application or Ruby on Rails. # def class_collisions(*class_names) #:nodoc: return unless behavior == :invoke class_names.flatten.each do |class_name| class_name = class_name.to_s next if class_name.strip.empty? # Split the class from its module nesting nesting = class_name.split('::') last_name = nesting.pop # Hack to limit const_defined? to non-inherited on 1.9 extra = [] extra << false unless Object.method(:const_defined?).arity == 1 # Extract the last Module in the nesting last = nesting.inject(Object) do |last, nest| break unless last.const_defined?(nest, *extra) last.const_get(nest) end if last && last.const_defined?(last_name.camelize, *extra) raise Error, "The name '#{class_name}' is either already used in your application " << "or reserved by Ruby on Rails. Please choose an alternative and run " << "this generator again." end end end # Use Rails default banner. # def self.banner "#{$0} #{generator_name} #{self.arguments.map{ |a| a.usage }.join(' ')} [options]" end # Sets the base_name taking into account the current class namespace. # def self.base_name @base_name ||= begin if base = name.to_s.split('::').first base.underscore end end end # Removes the namespaces and get the generator name. For example, # Rails::Generators::MetalGenerator will return "metal" as generator name. # def self.generator_name @generator_name ||= begin if generator = name.to_s.split('::').last generator.sub!(/Generator$/, '') generator.underscore end end end # Return the default value for the option name given doing a lookup in # Rails::Generators.options. # def self.default_value_for_option(name, options) default_for_option(Rails::Generators.options, name, options, options[:default]) end # Return default aliases for the option name given doing a lookup in # Rails::Generators.aliases. # def self.default_aliases_for_option(name, options) default_for_option(Rails::Generators.aliases, name, options, options[:aliases]) end # Return default for the option name given doing a lookup in config. # def self.default_for_option(config, name, options, default) if generator_name and c = config[generator_name.to_sym] and c.key?(name) c[name] elsif base_name and c = config[base_name.to_sym] and c.key?(name) c[name] elsif config[:rails].key?(name) config[:rails][name] else default end end # Keep hooks configuration that are used on prepare_for_invocation. # def self.hooks #:nodoc: @hooks ||= from_superclass(:hooks, {}) end # Prepare class invocation to search on Rails namespace if a previous # added hook is being used. # def self.prepare_for_invocation(name, value) #:nodoc: return super unless value.is_a?(String) || value.is_a?(Symbol) if value && constants = self.hooks[name] value = name if TrueClass === value Rails::Generators.find_by_namespace(value, *constants) elsif klass = Rails::Generators.find_by_namespace(value) klass else super end end # Small macro to add ruby as an option to the generator with proper # default value plus an instance helper method called shebang. # def self.add_shebang_option! class_option :ruby, :type => :string, :aliases => "-r", :default => Thor::Util.ruby_command, :desc => "Path to the Ruby binary of your choice", :banner => "PATH" no_tasks { define_method :shebang do @shebang ||= begin command = if options[:ruby] == Thor::Util.ruby_command "/usr/bin/env #{File.basename(Thor::Util.ruby_command)}" else options[:ruby] end "#!#{command}" end end } end end end end