require File.dirname(__FILE__) + '/options' require File.dirname(__FILE__) + '/manifest' require File.dirname(__FILE__) + '/spec' require File.dirname(__FILE__) + '/generated_attribute' # Rails::Generator is a code generation platform tailored for the Rails # web application framework. Generators are easily invoked within Rails # applications to add and remove components such as models and controllers. # New generators are easy to create and may be distributed as RubyGems or # tarballs for inclusion system-wide, per-user, or per-application. # # Generators may subclass other generators to provide variations that # require little or no new logic but replace the template files. # The postback generator is an example: it subclasses the scaffold # generator and just replaces the code templates with its own. # # Now go forth and multiply^Wgenerate. module Rails module Generator class GeneratorError < StandardError; end class UsageError < GeneratorError; end # The base code generator is bare-bones. It sets up the source and # destination paths and tells the logger whether to keep its trap shut. # You're probably looking for NamedBase, a subclass meant for generating # "named" components such as models, controllers, and mailers. # # Generators create a manifest of the actions they perform then hand # the manifest to a command which replay the actions to do the heavy # lifting. Create, destroy, and list commands are included. Since a # single manifest may be used by any command, creating new generators is # as simple as writing some code templates and declaring what you'd like # to do with them. # # The manifest method must be implemented by subclasses, returning a # Rails::Generator::Manifest. The record method is provided as a # convenience for manifest creation. Example: # class EliteGenerator < Rails::Generator::Base # def manifest # record do |m| # m.do(some) # m.things(in) { here } # end # end # end class Base include Options # Declare default options for the generator. These options # are inherited to subclasses. default_options :collision => :ask, :quiet => false # A logger instance available everywhere in the generator. cattr_accessor :logger # Every generator that is dynamically looked up is tagged with a # Spec describing where it was found. class_inheritable_accessor :spec attr_reader :source_root, :destination_root, :args def initialize(runtime_args, runtime_options = {}) @args = runtime_args parse!(@args, runtime_options) # Derive source and destination paths. @source_root = options[:source] || File.join(spec.path, 'templates') if options[:destination] @destination_root = options[:destination] elsif defined? ::RAILS_ROOT @destination_root = ::RAILS_ROOT end # Silence the logger if requested. logger.quiet = options[:quiet] # Raise usage error if help is requested. usage if options[:help] end # Generators must provide a manifest. Use the record method to create # a new manifest and record your generator's actions. def manifest raise NotImplementedError, "No manifest for '#{spec.name}' generator." end # Return the full path from the source root for the given path. # Example for source_root = '/source': # source_path('some/path.rb') == '/source/some/path.rb' # # The given path may include a colon ':' character to indicate that # the file belongs to another generator. This notation allows any # generator to borrow files from another. Example: # source_path('model:fixture.yml') = '/model/source/path/fixture.yml' def source_path(relative_source) # Check whether we're referring to another generator's file. name, path = relative_source.split(':', 2) # If not, return the full path to our source file. if path.nil? File.join(source_root, name) # Otherwise, ask our referral for the file. else # FIXME: this is broken, though almost always true. Others' # source_root are not necessarily the templates dir. File.join(self.class.lookup(name).path, 'templates', path) end end # Return the full path from the destination root for the given path. # Example for destination_root = '/dest': # destination_path('some/path.rb') == '/dest/some/path.rb' def destination_path(relative_destination) File.join(destination_root, relative_destination) end protected # Convenience method for generator subclasses to record a manifest. def record Rails::Generator::Manifest.new(self) { |m| yield m } end # Override with your own usage banner. def banner "Usage: #{$0} #{spec.name} [options]" end # Read USAGE from file in generator base path. def usage_message File.read(File.join(spec.path, 'USAGE')) rescue '' end end # The base generator for named components: models, controllers, mailers, # etc. The target name is taken as the first argument and inflected to # singular, plural, class, file, and table forms for your convenience. # The remaining arguments are aliased to actions for controller and # mailer convenience. # # If no name is provided, the generator raises a usage error with content # optionally read from the USAGE file in the generator's base path. # # See Rails::Generator::Base for a discussion of Manifests and Commands. class NamedBase < Base attr_reader :name, :class_name, :singular_name, :plural_name, :table_name attr_reader :class_path, :file_path, :class_nesting, :class_nesting_depth alias_method :file_name, :singular_name alias_method :actions, :args def initialize(runtime_args, runtime_options = {}) super # Name argument is required. usage if runtime_args.empty? @args = runtime_args.dup base_name = @args.shift assign_names!(base_name) end protected # Override with your own usage banner. def banner "Usage: #{$0} #{spec.name} #{spec.name.camelize}Name [options]" end def attributes @attributes ||= @args.collect do |attribute| Rails::Generator::GeneratedAttribute.new(*attribute.split(":")) end end private def assign_names!(name) @name = name base_name, @class_path, @file_path, @class_nesting, @class_nesting_depth = extract_modules(@name) @class_name_without_nesting, @singular_name, @plural_name = inflect_names(base_name) @table_name = ActiveRecord::Base.pluralize_table_names ? plural_name : singular_name if @class_nesting.empty? @class_name = @class_name_without_nesting else @table_name = @class_nesting.underscore << "_" << @table_name @class_name = "#{@class_nesting}::#{@class_name_without_nesting}" end end # Extract modules from filesystem-style or ruby-style path: # good/fun/stuff # Good::Fun::Stuff # produce the same results. def extract_modules(name) modules = name.include?('/') ? name.split('/') : name.split('::') name = modules.pop path = modules.map { |m| m.underscore } file_path = (path + [name.underscore]).join('/') nesting = modules.map { |m| m.camelize }.join('::') [name, path, file_path, nesting, modules.size] end def inflect_names(name) camel = name.camelize under = camel.underscore plural = under.pluralize [camel, under, plural] end end end end