Initial command structure.

railties/lib/rails/cli.rb

@@ -7,9 +7,11 @@ Rails::AppLoader.exec_app
 require "rails/ruby_version_check"
 Signal.trap("INT") { puts; exit(1) }
 
+require "rails/command"
+
 if ARGV.first == "plugin"
   ARGV.shift
-  require "rails/commands/plugin"
+  Rails::Command.invoke :plugin, ARGV
 else
-  require "rails/commands/application"
+  Rails::Command.invoke :application, ARGV
 end

railties/lib/rails/command.rb

@@ -0,0 +1,96 @@
+require "active_support"
+require "active_support/core_ext/enumerable"
+require "active_support/core_ext/object/blank"
+require "active_support/core_ext/hash/transform_values"
+
+require "thor"
+
+module Rails
+  module Command
+    autoload :Behavior, "rails/command/behavior"
+    autoload :Base, "rails/command/base"
+
+    include Behavior
+
+    class << self
+      def hidden_commands # :nodoc:
+        @hidden_commands ||= []
+      end
+
+      def environment
+        ENV["RAILS_ENV"] || ENV["RACK_ENV"] || "development"
+      end
+
+      # Receives a namespace, arguments and the behavior to invoke the command.
+      def invoke(namespace, args = [], **config)
+        namespace = namespace.to_s
+        namespace = "help" if namespace.blank? || Thor::HELP_MAPPINGS.include?(namespace)
+        namespace = "version" if %w( -v --version ).include? namespace
+
+        if command = find_by_namespace(namespace)
+          command.perform(namespace, args, config)
+        else
+          find_by_namespace("rake").perform(namespace, args, config)
+        end
+      end
+
+      # Rails finds namespaces similar to thor, it only adds one rule:
+      #
+      # Command names must end with "_command.rb". This is required because Rails
+      # looks in load paths and loads the command just before it's going to be used.
+      #
+      #   find_by_namespace :webrat, :rails, :integration
+      #
+      # Will search for the following commands:
+      #
+      #   "rails:webrat", "webrat:integration", "webrat"
+      #
+      # Notice that "rails:commands:webrat" could be loaded as well, what
+      # Rails looks for is the first and last parts of the namespace.
+      def find_by_namespace(name) # :nodoc:
+        lookups = [ name, "rails:#{name}" ]
+
+        lookup(lookups)
+
+        namespaces = subclasses.index_by(&:namespace)
+        namespaces[(lookups & namespaces.keys).first]
+      end
+
+      # Returns the root of the Rails engine or app running the command.
+      def root
+        if defined?(ENGINE_ROOT)
+          Pathname.new(ENGINE_ROOT)
+        elsif defined?(APP_PATH)
+          Pathname.new(File.expand_path("../..", APP_PATH))
+        end
+      end
+
+      def print_commands # :nodoc:
+        sorted_groups.each { |b, n| print_list(b, n) }
+      end
+
+      def sorted_groups # :nodoc:
+        lookup!
+
+        groups = (subclasses - hidden_commands).group_by { |c| c.namespace.split(":").first }
+        groups.transform_values! { |commands| commands.flat_map(&:printing_commands).sort }
+
+        rails = groups.delete("rails")
+        [[ "rails", rails ]] + groups.sort.to_a
+      end
+
+      protected
+        def command_type
+          @command_type ||= "command"
+        end
+
+        def lookup_paths
+          @lookup_paths ||= %w( rails/commands commands )
+        end
+
+        def file_lookup_paths
+          @file_lookup_paths ||= [ "{#{lookup_paths.join(',')}}", "**", "*_command.rb" ]
+        end
+    end
+  end
+end

railties/lib/rails/command/actions.rb

@@ -0,0 +1,18 @@
+module Rails
+  module Command
+    module Actions
+      private
+        # Change to the application's path if there is no config.ru file in current directory.
+        # This allows us to run `rails server` from other directories, but still get
+        # the main config.ru and properly set the tmp directory.
+        def set_application_directory!
+          Dir.chdir(File.expand_path("../../", APP_PATH)) unless File.exist?(File.expand_path("config.ru"))
+        end
+
+        def require_application_and_environment!
+          require APP_PATH
+          Rails.application.require_environment!
+        end
+    end
+  end
+end

railties/lib/rails/command/base.rb

@@ -0,0 +1,130 @@
+require "thor"
+require "erb"
+
+require "active_support/core_ext/string/filters"
+require "active_support/core_ext/string/inflections"
+
+require "rails/command/actions"
+
+module Rails
+  module Command
+    class Base < Thor
+      class Error < Thor::Error # :nodoc:
+      end
+
+      include Actions
+
+      class << self
+        # Tries to get the description from a USAGE file one folder above the command
+        # root.
+        def desc(usage = nil, description = nil)
+          if usage
+            super
+          else
+            @desc ||= ERB.new(File.read(usage_path)).result(binding) if usage_path
+          end
+        end
+
+        # Convenience method to get the namespace from the class name. It's the
+        # same as Thor default except that the Command at the end of the class
+        # is removed.
+        def namespace(name = nil)
+          if name
+            super
+          else
+            @namespace ||= super.chomp("_command").sub(/:command:/, ":")
+          end
+        end
+
+        # Convenience method to hide this command from the available ones when
+        # running rails command.
+        def hide_command!
+          Rails::Command.hidden_commands << self
+        end
+
+        def inherited(base) #:nodoc:
+          super
+
+          if base.name && base.name !~ /Base$/
+            Rails::Command.subclasses << base
+          end
+        end
+
+        def perform(command, args, config) # :nodoc:
+          command = nil if Thor::HELP_MAPPINGS.include?(args.first)
+
+          dispatch(command, args.dup, nil, config)
+        end
+
+        def printing_commands
+          namespace.sub(/^rails:/, "")
+        end
+
+        def executable
+          "bin/rails #{command_name}"
+        end
+
+        # Use Rails' default banner.
+        def banner(*)
+          "#{executable} #{arguments.map(&:usage).join(' ')} [options]".squish!
+        end
+
+        # Sets the base_name taking into account the current class namespace.
+        #
+        #   Rails::Command::TestCommand.base_name # => 'rails'
+        def base_name
+          @base_name ||= begin
+            if base = name.to_s.split("::").first
+              base.underscore
+            end
+          end
+        end
+
+        # Return command name without namespaces.
+        #
+        #   Rails::Command::TestCommand.command_name # => 'test'
+        def command_name
+          @command_name ||= begin
+            if command = name.to_s.split("::").last
+              command.chomp!("Command")
+              command.underscore
+            end
+          end
+        end
+
+        # Path to lookup a USAGE description in a file.
+        def usage_path
+          if default_command_root
+            path = File.join(default_command_root, "USAGE")
+            path if File.exist?(path)
+          end
+        end
+
+        # Default file root to place extra files a command might need, placed
+        # one folder above the command file.
+        #
+        # For a `Rails::Command::TestCommand` placed in `rails/command/test_command.rb`
+        # would return `rails/test`.
+        def default_command_root
+          path = File.expand_path(File.join(base_name, command_name), __dir__)
+          path if File.exist?(path)
+        end
+
+        private
+          # Allow the command method to be called perform.
+          def create_command(meth)
+            if meth == "perform"
+              alias_method command_name, meth
+            else
+              # Prevent exception about command without usage.
+              # Some commands define their documentation differently.
+              @usage ||= ""
+              @desc  ||= ""
+
+              super
+            end
+          end
+      end
+    end
+  end
+end

railties/lib/rails/command/behavior.rb

@@ -0,0 +1,123 @@
+require "active_support"
+
+module Rails
+  module Command
+    module Behavior #:nodoc:
+      extend ActiveSupport::Concern
+
+      class_methods do
+        # Remove the color from output.
+        def no_color!
+          Thor::Base.shell = Thor::Shell::Basic
+        end
+
+        # Track all command subclasses.
+        def subclasses
+          @subclasses ||= []
+        end
+
+        protected
+
+          # This code is based directly on the Text gem implementation.
+          # Copyright (c) 2006-2013 Paul Battley, Michael Neumann, Tim Fletcher.
+          #
+          # Returns a value representing the "cost" of transforming str1 into str2
+          def levenshtein_distance(str1, str2)
+            s = str1
+            t = str2
+            n = s.length
+            m = t.length
+
+            return m if (0 == n)
+            return n if (0 == m)
+
+            d = (0..m).to_a
+            x = nil
+
+            # avoid duplicating an enumerable object in the loop
+            str2_codepoint_enumerable = str2.each_codepoint
+
+            str1.each_codepoint.with_index do |char1, i|
+              e = i+1
+
+              str2_codepoint_enumerable.with_index do |char2, j|
+                cost = (char1 == char2) ? 0 : 1
+                x = [
+                     d[j+1] + 1, # insertion
+                     e + 1,      # deletion
+                     d[j] + cost # substitution
+                    ].min
+                d[j] = e
+                e = x
+              end
+
+              d[m] = x
+            end
+
+            x
+          end
+
+          # Prints a list of generators.
+          def print_list(base, namespaces) #:nodoc:
+            return if namespaces.empty?
+            puts "#{base.camelize}:"
+
+            namespaces.each do |namespace|
+              puts("  #{namespace}")
+            end
+
+            puts
+          end
+
+          # Receives namespaces in an array and tries to find matching generators
+          # in the load path.
+          def lookup(namespaces) #:nodoc:
+            paths = namespaces_to_paths(namespaces)
+
+            paths.each do |raw_path|
+              lookup_paths.each do |base|
+                path = "#{base}/#{raw_path}_#{command_type}"
+
+                begin
+                  require path
+                  return
+                rescue LoadError => e
+                  raise unless e.message =~ /#{Regexp.escape(path)}$/
+                rescue Exception => e
+                  warn "[WARNING] Could not load #{command_type} #{path.inspect}. Error: #{e.message}.\n#{e.backtrace.join("\n")}"
+                end
+              end
+            end
+          end
+
+          # This will try to load any command in the load path to show in help.
+          def lookup! #:nodoc:
+            $LOAD_PATH.each do |base|
+              Dir[File.join(base, *file_lookup_paths)].each do |path|
+                begin
+                  path = path.sub("#{base}/", "")
+                  require path
+                rescue Exception
+                  # No problem
+                end
+              end
+            end
+          end
+
+          # Convert namespaces to paths by replacing ":" for "/" and adding
+          # an extra lookup. For example, "rails:model" should be searched
+          # in both: "rails/model/model_generator" and "rails/model_generator".
+          def namespaces_to_paths(namespaces) #:nodoc:
+            paths = []
+            namespaces.each do |namespace|
+              pieces = namespace.split(":")
+              paths << pieces.dup.push(pieces.last).join("/")
+              paths << pieces.join("/")
+            end
+            paths.uniq!
+            paths
+          end
+      end
+    end
+  end
+end

railties/lib/rails/command/environment_argument.rb

@@ -0,0 +1,32 @@
+require "active_support"
+
+module Rails
+  module Command
+    module EnvironmentArgument #:nodoc:
+      extend ActiveSupport::Concern
+
+      included do
+        argument :environment, optional: true, banner: "environment"
+      end
+
+      private
+        def extract_environment_option_from_argument
+          if environment
+            self.options = options.merge(environment: acceptable_environment(environment))
+          end
+        end
+
+        def acceptable_environment(env = nil)
+          if available_environments.include? env
+            env
+          else
+            %w(production development test).detect { |e| e =~ /^#{env}/ } || env
+          end
+        end
+
+        def available_environments
+          Dir["config/environments/*.rb"].map { |fname| File.basename(fname, ".*") }
+        end
+    end
+  end
+end

railties/lib/rails/commands.rb

@@ -1,4 +1,4 @@
-ARGV << "--help" if ARGV.empty?
+require "rails/command"
 
 aliases = {
   "g"  => "generate",
@@ -13,6 +13,4 @@ aliases = {
 command = ARGV.shift
 command = aliases[command] || command
 
-require "rails/commands/commands_tasks"
-
-Rails::CommandsTasks.new(ARGV).run_command!(command)
+Rails::Command.invoke command, ARGV

railties/lib/rails/commands/application/application_command.rb

@@ -0,0 +1,29 @@
+require "rails/generators"
+require "rails/generators/rails/app/app_generator"
+
+module Rails
+  module Generators
+    class AppGenerator # :nodoc:
+      # We want to exit on failure to be kind to other libraries
+      # This is only when accessing via CLI
+      def self.exit_on_failure?
+        true
+      end
+    end
+  end
+
+  module Command
+    class ApplicationCommand < Base
+      hide_command!
+
+      def help
+        perform # Punt help output to the generator.
+      end
+
+      def perform(*args)
+        Rails::Generators::AppGenerator.start \
+          Rails::Generators::ARGVScrubber.new(args).prepare!
+      end
+    end
+  end
+end

railties/lib/rails/commands/console/console_command.rb

@@ -0,0 +1,89 @@
+require "irb"
+require "irb/completion"
+
+require "rails/command/environment_argument"
+
+module Rails
+  class Console
+    module BacktraceCleaner
+      def filter_backtrace(bt)
+        if result = super
+          Rails.backtrace_cleaner.filter([result]).first
+        end
+      end
+    end
+
+    def self.start(*args)
+      new(*args).start
+    end
+
+    attr_reader :options, :app, :console
+
+    def initialize(app, options = {})
+      @app     = app
+      @options = options
+
+      app.sandbox = sandbox?
+      app.load_console
+
+      @console = app.config.console || IRB
+
+      if @console == IRB
+        IRB::WorkSpace.prepend(BacktraceCleaner)
+      end
+    end
+
+    def sandbox?
+      options[:sandbox]
+    end
+
+    def environment
+      options[:environment]
+    end
+    alias_method :environment?, :environment
+
+    def set_environment!
+      Rails.env = environment
+    end
+
+    def start
+      set_environment! if environment?
+
+      if sandbox?
+        puts "Loading #{Rails.env} environment in sandbox (Rails #{Rails.version})"
+        puts "Any modifications you make will be rolled back on exit"
+      else
+        puts "Loading #{Rails.env} environment (Rails #{Rails.version})"
+      end
+
+      if defined?(console::ExtendCommandBundle)
+        console::ExtendCommandBundle.include(Rails::ConsoleMethods)
+      end
+      console.start
+    end
+  end
+
+  module Command
+    class ConsoleCommand < Base
+      include EnvironmentArgument
+
+      class_option :sandbox, aliases: "-s", type: :boolean, default: false,
+        desc: "Rollback database modifications on exit."
+
+      class_option :environment, aliases: "-e", type: :string, default: Rails::Command.environment,
+        desc: "Specifies the environment to run this console under (test/development/production)."
+
+      def perform
+        extract_environment_option_from_argument
+
+        # RAILS_ENV needs to be set before config/application is required.
+        ENV["RAILS_ENV"] = options[:environment]
+
+        ARGV.clear # Clear ARGV so IRB doesn't freak.
+
+        require_application_and_environment!
+        Rails::Console.start(Rails.application, options)
+      end
+    end
+  end
+end

railties/lib/rails/commands/dbconsole/dbconsole_command.rb

@@ -0,0 +1,160 @@
+require "erb"
+require "yaml"
+
+require "rails/command/environment_argument"
+
+module Rails
+  class DBConsole
+    attr_reader :arguments
+
+    def self.start(*args)
+      new(*args).start
+    end
+
+    def initialize(arguments = ARGV, options = {})
+      @arguments, @options = arguments, options
+    end
+
+    def start
+      ENV["RAILS_ENV"] = @options[:environment] || environment
+
+      case config["adapter"]
+      when /^(jdbc)?mysql/
+        args = {
+          "host"      => "--host",
+          "port"      => "--port",
+          "socket"    => "--socket",
+          "username"  => "--user",
+          "encoding"  => "--default-character-set",
+          "sslca"     => "--ssl-ca",
+          "sslcert"   => "--ssl-cert",
+          "sslcapath" => "--ssl-capath",
+          "sslcipher" => "--ssl-cipher",
+          "sslkey"    => "--ssl-key"
+        }.map { |opt, arg| "#{arg}=#{config[opt]}" if config[opt] }.compact
+
+        if config["password"] && @options["include_password"]
+          args << "--password=#{config['password']}"
+        elsif config["password"] && !config["password"].to_s.empty?
+          args << "-p"
+        end
+
+        args << config["database"]
+
+        find_cmd_and_exec(["mysql", "mysql5"], *args)
+
+      when /^postgres|^postgis/
+        ENV["PGUSER"]     = config["username"] if config["username"]
+        ENV["PGHOST"]     = config["host"] if config["host"]
+        ENV["PGPORT"]     = config["port"].to_s if config["port"]
+        ENV["PGPASSWORD"] = config["password"].to_s if config["password"] && @options["include_password"]
+        find_cmd_and_exec("psql", config["database"])
+
+      when "sqlite3"
+        args = []
+
+        args << "-#{@options['mode']}" if @options["mode"]
+        args << "-header" if @options["header"]
+        args << File.expand_path(config["database"], Rails.respond_to?(:root) ? Rails.root : nil)
+
+        find_cmd_and_exec("sqlite3", *args)
+
+      when "oracle", "oracle_enhanced"
+        logon = ""
+
+        if config["username"]
+          logon = config["username"]
+          logon << "/#{config['password']}" if config["password"] && @options["include_password"]
+          logon << "@#{config['database']}" if config["database"]
+        end
+
+        find_cmd_and_exec("sqlplus", logon)
+
+      when "sqlserver"
+        args = []
+
+        args += ["-D", "#{config['database']}"] if config["database"]
+        args += ["-U", "#{config['username']}"] if config["username"]
+        args += ["-P", "#{config['password']}"] if config["password"]
+
+        if config["host"]
+          host_arg = "#{config['host']}"
+          host_arg << ":#{config['port']}" if config["port"]
+          args += ["-S", host_arg]
+        end
+
+        find_cmd_and_exec("sqsh", *args)
+
+      else
+        abort "Unknown command-line client for #{config['database']}."
+      end
+    end
+
+    def config
+      @config ||= begin
+        if configurations[environment].blank?
+          raise ActiveRecord::AdapterNotSpecified, "'#{environment}' database is not configured. Available configuration: #{configurations.inspect}"
+        else
+          configurations[environment]
+        end
+      end
+    end
+
+    def environment
+      Rails.respond_to?(:env) ? Rails.env : Rails::Command.environment
+    end
+
+    protected
+      def configurations
+        require APP_PATH
+        ActiveRecord::Base.configurations = Rails.application.config.database_configuration
+        ActiveRecord::Base.configurations
+      end
+
+      def find_cmd_and_exec(commands, *args)
+        commands = Array(commands)
+
+        dirs_on_path = ENV["PATH"].to_s.split(File::PATH_SEPARATOR)
+        unless (ext = RbConfig::CONFIG["EXEEXT"]).empty?
+          commands = commands.map { |cmd| "#{cmd}#{ext}" }
+        end
+
+        full_path_command = nil
+        found = commands.detect do |cmd|
+          dirs_on_path.detect do |path|
+            full_path_command = File.join(path, cmd)
+            File.file?(full_path_command) && File.executable?(full_path_command)
+          end
+        end
+
+        if found
+          exec full_path_command, *args
+        else
+          abort("Couldn't find database client: #{commands.join(', ')}. Check your $PATH and try again.")
+        end
+      end
+  end
+
+  module Command
+    class DbconsoleCommand < Base
+      include EnvironmentArgument
+
+      class_option :include_password, aliases: "-p", type: :boolean,
+        desc: "Automatically provide the password from database.yml"
+
+      class_option :mode, enum: %w( html list line column ), type: :string,
+        desc: "Automatically put the sqlite3 database in the specified mode (html, list, line, column)."
+
+      class_option :header, type: :string
+
+      class_option :environment, aliases: "-e", type: :string, default: Rails::Command.environment,
+        desc: "Specifies the environment to run this console under (test/development/production)."
+
+      def perform
+        extract_environment_option_from_argument
+
+        Rails::DBConsole.start(args, options)
+      end
+    end
+  end
+end

railties/lib/rails/commands/destroy/destroy_command.rb

@@ -0,0 +1,21 @@
+require "rails/generators"
+
+module Rails
+  module Command
+    class DestroyCommand < Base
+      def help # :nodoc:
+        Rails::Generators.help self.class.command_name
+      end
+
+      def perform(*)
+        generator = args.shift
+        return help unless generator
+
+        require_application_and_environment!
+        Rails.application.load_generators
+
+        Rails::Generators.invoke generator, args, behavior: :revoke, destination_root: Rails.root
+      end
+    end
+  end
+end

railties/lib/rails/commands/generate/generate_command.rb

@@ -0,0 +1,21 @@
+require "rails/generators"
+
+module Rails
+  module Command
+    class GenerateCommand < Base
+      def help # :nodoc:
+        Rails::Generators.help self.class.command_name
+      end
+
+      def perform(*)
+        generator = args.shift
+        return help unless generator
+
+        require_application_and_environment!
+        load_generators
+
+        Rails::Generators.invoke generator, args, behavior: :invoke, destination_root: Rails::Command.root
+      end
+    end
+  end
+end

railties/lib/rails/commands/help/USAGE

@@ -0,0 +1,16 @@
+Usage: bin/rails COMMAND [args] [options]
+
+The most common rails commands are:
+ generate    Generate new code (short-cut alias: "g")
+ console     Start the Rails console (short-cut alias: "c")
+ server      Start the Rails server (short-cut alias: "s")
+ test        Run tests (short-cut alias: "t")
+ dbconsole   Start a console for the database specified in config/database.yml
+             (short-cut alias: "db")
+ new         Create a new Rails application. "rails new my_app" creates a
+             new application called MyApp in "./my_app"
+
+All commands can be run with -h (or --help) for more information.
+
+In addition to those commands, there are:
+

railties/lib/rails/commands/help/help_command.rb

@@ -0,0 +1,13 @@
+module Rails
+  module Command
+    class HelpCommand < Base
+      hide_command!
+
+      def help(*)
+        puts self.class.desc
+
+        Rails::Command.print_commands
+      end
+    end
+  end
+end

railties/lib/rails/commands/new/new_command.rb

@@ -0,0 +1,15 @@
+module Rails
+  module Command
+    class NewCommand < Base
+      def help
+        Rails::Command.invoke :application, [ "--help" ]
+      end
+
+      def perform(*)
+        puts "Can't initialize a new Rails application within the directory of another, please change to a non-Rails directory first.\n"
+        puts "Type 'rails' for help."
+        exit 1
+      end
+    end
+  end
+end

railties/lib/rails/commands/plugin/plugin_command.rb

@@ -0,0 +1,43 @@
+module Rails
+  module Command
+    class PluginCommand < Base
+      hide_command!
+
+      def help
+        run_plugin_generator %w( --help )
+      end
+
+      def self.banner(*) # :nodoc:
+        "#{executable} new [options]"
+      end
+
+      class_option :rc, type: :boolean, default: File.join("~", ".railsrc"),
+        desc: "Initialize the plugin command with previous defaults. Uses .railsrc in your home directory by default."
+
+      class_option :no_rc, desc: "Skip evaluating .railsrc."
+
+      def perform(type = nil, *plugin_args)
+        plugin_args << "--help" unless type == "new"
+
+        unless options.key?("no_rc") # Thor's not so indifferent access hash.
+          railsrc = File.expand_path(options[:rc])
+
+          if File.exist?(railsrc)
+            extra_args = File.read(railsrc).split(/\n+/).flat_map(&:split)
+            puts "Using #{extra_args.join(" ")} from #{railsrc}"
+            plugin_args.insert(1, *extra_args)
+          end
+        end
+
+        run_plugin_generator plugin_args
+      end
+
+      private
+        def run_plugin_generator(plugin_args)
+          require "rails/generators"
+          require "rails/generators/rails/plugin/plugin_generator"
+          Rails::Generators::PluginGenerator.start plugin_args
+        end
+    end
+  end
+end

railties/lib/rails/commands/rake/rake_command.rb

@@ -0,0 +1,49 @@
+module Rails
+  module Command
+    class RakeCommand < Base
+      namespace "rake"
+
+      class << self
+        def printing_commands
+          formatted_rake_tasks.map(&:first)
+        end
+
+        def perform(task, *)
+          require_rake
+
+          ARGV.unshift(task) # Prepend the task, so Rake knows how to run it.
+
+          Rake.application.standard_exception_handling do
+            Rake.application.init("rails")
+            Rake.application.load_rakefile
+            Rake.application.top_level
+          end
+        end
+
+        private
+          def rake_tasks
+            require_rake
+
+            return @rake_tasks if defined?(@rake_tasks)
+
+            ActiveSupport::Deprecation.silence do
+              Rails::Command.require_application_and_environment!
+            end
+
+            Rake::TaskManager.record_task_metadata = true
+            Rake.application.instance_variable_set(:@name, "rails")
+            Rails.application.load_tasks
+            @rake_tasks = Rake.application.tasks.select(&:comment)
+          end
+
+          def formatted_rake_tasks
+            rake_tasks.map { |t| [ t.name_with_args, t.comment ] }
+          end
+
+          def require_rake
+            require "rake" # Defer booting Rake until we know it's needed.
+          end
+      end
+    end
+  end
+end

railties/lib/rails/commands/runner/USAGE

@@ -0,0 +1,17 @@
+Examples:
+
+Run `puts Rails.env` after loading the app:
+
+  <%= executable %> 'puts Rails.env'
+
+Run the Ruby file located at `path/to/filename.rb` after loading the app:
+
+  <%= executable %> path/to/filename.rb
+
+<% if RbConfig::CONFIG['host_os'] !~ /mswin|mingw/ %>
+You can also use the runner command as a shebang line for your executables:
+
+  #!/usr/bin/env <%= File.expand_path(executable) %>
+
+  Product.all.each { |p| p.price *= 2 ; p.save! }
+<% end %>

railties/lib/rails/commands/runner/runner_command.rb

@@ -0,0 +1,45 @@
+module Rails
+  module Command
+    class RunnerCommand < Base
+      class_option :environment, aliases: "-e", type: :string,
+        default: Rails::Command.environment.dup,
+        desc: "The environment for the runner to operate under (test/development/production)"
+
+      def help
+        super
+        puts self.class.desc
+      end
+
+      def self.banner(*)
+        "#{super} [<'Some.ruby(code)'> | <filename.rb>]"
+      end
+
+      def perform(code_or_file = nil)
+        unless code_or_file
+          help
+          exit 1
+        end
+
+        ENV["RAILS_ENV"] = options[:environment]
+
+        require_application_and_environment!
+        Rails.application.load_runner
+
+        if File.exist?(code_or_file)
+          $0 = code_or_file
+          Kernel.load code_or_file
+        else
+          begin
+            eval(code_or_file, binding, __FILE__, __LINE__)
+          rescue SyntaxError, NameError => error
+            $stderr.puts "Please specify a valid ruby command or the path of a script to run."
+            $stderr.puts "Run '#{self.class.executable} -h' for help."
+            $stderr.puts
+            $stderr.puts error
+            exit 1
+          end
+        end
+      end
+    end
+  end
+end

railties/lib/rails/commands/server/server_command.rb

@@ -0,0 +1,159 @@
+require "fileutils"
+require "optparse"
+require "action_dispatch"
+require "rails"
+require "rails/dev_caching"
+
+module Rails
+  class Server < ::Rack::Server
+    class Options
+      DEFAULT_PID_PATH = File.expand_path("tmp/pids/server.pid").freeze
+
+      def parse!(args)
+        args, options = args.dup, {}
+
+        option_parser(options).parse! args
+
+        options[:log_stdout] = options[:daemonize].blank? && (options[:environment] || Rails.env) == "development"
+        options[:server]     = args.shift
+        options
+      end
+
+      def option_parser(options) # :nodoc:
+        OptionParser.new do |opts|
+          opts.banner = "Usage: rails server [mongrel, thin etc] [options]"
+
+          opts.separator ""
+          opts.separator "Options:"
+
+          opts.on("-p", "--port=port", Integer,
+                  "Runs Rails on the specified port.", "Default: 3000") { |v| options[:Port] = v }
+          opts.on("-b", "--binding=IP", String,
+                  "Binds Rails to the specified IP.", "Default: localhost") { |v| options[:Host] = v }
+          opts.on("-c", "--config=file", String,
+                  "Uses a custom rackup configuration.") { |v| options[:config] = v }
+          opts.on("-d", "--daemon", "Runs server as a Daemon.") { options[:daemonize] = true }
+          opts.on("-e", "--environment=name", String,
+                  "Specifies the environment to run this server under (test/development/production).",
+                  "Default: development") { |v| options[:environment] = v }
+          opts.on("-P", "--pid=pid", String,
+                  "Specifies the PID file.",
+                  "Default: tmp/pids/server.pid") { |v| options[:pid] = v }
+          opts.on("-C", "--[no-]dev-caching",
+                  "Specifies whether to perform caching in development.",
+                  "true or false") { |v| options[:caching] = v }
+
+          opts.separator ""
+
+          opts.on("-h", "--help", "Shows this help message.") { puts opts; exit }
+        end
+      end
+    end
+
+    def initialize(*)
+      super
+      set_environment
+    end
+
+    # TODO: this is no longer required but we keep it for the moment to support older config.ru files.
+    def app
+      @app ||= begin
+        app = super
+        app.respond_to?(:to_app) ? app.to_app : app
+      end
+    end
+
+    def opt_parser
+      Options.new
+    end
+
+    def set_environment
+      ENV["RAILS_ENV"] ||= options[:environment]
+    end
+
+    def start
+      print_boot_information
+      trap(:INT) { exit }
+      create_tmp_directories
+      setup_dev_caching
+      log_to_stdout if options[:log_stdout]
+
+      super
+    ensure
+      # The '-h' option calls exit before @options is set.
+      # If we call 'options' with it unset, we get double help banners.
+      puts "Exiting" unless @options && options[:daemonize]
+    end
+
+    def middleware
+      Hash.new([])
+    end
+
+    def default_options
+      super.merge(        Port:               ENV.fetch("PORT", 3000).to_i,
+        DoNotReverseLookup: true,
+        environment:        (ENV["RAILS_ENV"] || ENV["RACK_ENV"] || "development").dup,
+        daemonize:          false,
+        caching:            nil,
+        pid:                Options::DEFAULT_PID_PATH,
+        restart_cmd:        restart_command)
+    end
+
+    private
+
+      def setup_dev_caching
+        if options[:environment] == "development"
+          Rails::DevCaching.enable_by_argument(options[:caching])
+        end
+      end
+
+      def print_boot_information
+        url = "#{options[:SSLEnable] ? 'https' : 'http'}://#{options[:Host]}:#{options[:Port]}"
+        puts "=> Booting #{ActiveSupport::Inflector.demodulize(server)}"
+        puts "=> Rails #{Rails.version} application starting in #{Rails.env} on #{url}"
+        puts "=> Run `rails server -h` for more startup options"
+      end
+
+      def create_tmp_directories
+        %w(cache pids sockets).each do |dir_to_make|
+          FileUtils.mkdir_p(File.join(Rails.root, "tmp", dir_to_make))
+        end
+      end
+
+      def log_to_stdout
+        wrapped_app # touch the app so the logger is set up
+
+        console = ActiveSupport::Logger.new(STDOUT)
+        console.formatter = Rails.logger.formatter
+        console.level = Rails.logger.level
+
+        unless ActiveSupport::Logger.logger_outputs_to?(Rails.logger, STDOUT)
+          Rails.logger.extend(ActiveSupport::Logger.broadcast(console))
+        end
+      end
+
+      def restart_command
+        "bin/rails server #{ARGV.join(' ')}"
+      end
+  end
+
+  module Command
+    class ServerCommand < Base
+      def help # :nodoc:
+        puts Rails::Server::Options.new.option_parser(Hash.new)
+      end
+
+      def perform
+        set_application_directory!
+
+        Rails::Server.new.tap do |server|
+          # Require application after server sets environment to propagate
+          # the --environment option.
+          require APP_PATH
+          Dir.chdir(Rails.application.root)
+          server.start
+        end
+      end
+    end
+  end
+end

railties/lib/rails/commands/test/test_command.rb

@@ -0,0 +1,18 @@
+require "rails/command"
+require "rails/test_unit/minitest_plugin"
+
+module Rails
+  module Command
+    class TestCommand < Base
+      def help # :nodoc:
+        perform # Hand over help printing to minitest.
+      end
+
+      def perform(*)
+        $LOAD_PATH << Rails::Command.root.join("test")
+
+        exit Minitest.run(ARGV)
+      end
+    end
+  end
+end

railties/lib/rails/commands/version/version_command.rb

@@ -0,0 +1,9 @@
+module Rails
+  module Command
+    class VersionCommand < Base
+      def perform
+        Rails::Command.invoke :application, [ "--version" ]
+      end
+    end
+  end
+end

railties/lib/rails/generators.rb

@@ -2,6 +2,7 @@ activesupport_path = File.expand_path("../../../../activesupport/lib", __FILE__)
 $:.unshift(activesupport_path) if File.directory?(activesupport_path) && !$:.include?(activesupport_path)
 
 require "thor/group"
+require "rails/command"
 
 require "active_support"
 require "active_support/core_ext/object/blank"
@@ -13,6 +14,8 @@ require "active_support/core_ext/string/inflections"
 
 module Rails
   module Generators
+    include Rails::Command::Behavior
+
     autoload :Actions,         "rails/generators/actions"
     autoload :ActiveModel,     "rails/generators/active_model"
     autoload :Base,            "rails/generators/base"
@@ -127,67 +130,6 @@ module Rails
       Thor::Base.shell = Thor::Shell::Basic
     end
 
-    # Track all generators subclasses.
-    def self.subclasses
-      @subclasses ||= []
-    end
-
-    # Rails finds namespaces similar to thor, it only adds one rule:
-    #
-    # Generators names must end with "_generator.rb". This is required because Rails
-    # looks in load paths and loads the generator just before it's going to be used.
-    #
-    #   find_by_namespace :webrat, :rails, :integration
-    #
-    # Will search for the following generators:
-    #
-    #   "rails:webrat", "webrat:integration", "webrat"
-    #
-    # Notice that "rails:generators:webrat" could be loaded as well, what
-    # Rails looks for is the first and last parts of the namespace.
-    def self.find_by_namespace(name, base=nil, context=nil) #:nodoc:
-      lookups = []
-      lookups << "#{base}:#{name}"    if base
-      lookups << "#{name}:#{context}" if context
-
-      unless base || context
-        unless name.to_s.include?(?:)
-          lookups << "#{name}:#{name}"
-          lookups << "rails:#{name}"
-        end
-        lookups << "#{name}"
-      end
-
-      lookup(lookups)
-
-      namespaces = Hash[subclasses.map { |klass| [klass.namespace, klass] }]
-
-      lookups.each do |namespace|
-        klass = namespaces[namespace]
-        return klass if klass
-      end
-
-      invoke_fallbacks_for(name, base) || invoke_fallbacks_for(context, name)
-    end
-
-    # Receives a namespace, arguments and the behavior to invoke the generator.
-    # It's used as the default entry point for generate, destroy and update
-    # commands.
-    def self.invoke(namespace, args=ARGV, config={})
-      names = namespace.to_s.split(":")
-      if klass = find_by_namespace(names.pop, names.any? && names.join(":"))
-        args << "--help" if args.empty? && klass.arguments.any?(&:required?)
-        klass.start(args, config)
-      else
-        options     = sorted_groups.flat_map(&:last)
-        suggestions = options.sort_by { |suggested| levenshtein_distance(namespace.to_s, suggested) }.first(3)
-        msg =  "Could not find generator '#{namespace}'. "
-        msg << "Maybe you meant #{ suggestions.map { |s| "'#{s}'" }.to_sentence(last_word_connector: " or ", locale: :en) }\n"
-        msg << "Run `rails generate --help` for more options."
-        puts msg
-      end
-    end
-
     # Returns an array of generator namespaces that are hidden.
     # Generator namespaces may be hidden for a variety of reasons.
     # Some are aliased such as "rails:migration" and can be
@@ -260,11 +202,13 @@ module Rails
     def self.sorted_groups
       namespaces = public_namespaces
       namespaces.sort!
+
       groups = Hash.new { |h,k| h[k] = [] }
       namespaces.each do |namespace|
         base = namespace.split(":").first
         groups[base] << namespace
       end
+
       rails = groups.delete("rails")
       rails.map! { |n| n.sub(/^rails:/, "") }
       rails.delete("app")
@@ -275,61 +219,66 @@ module Rails
       [[ "rails", rails ]] + groups.sort.to_a
     end
 
-    protected
-
-      # This code is based directly on the Text gem implementation.
-      # Copyright (c) 2006-2013 Paul Battley, Michael Neumann, Tim Fletcher.
+    # Rails finds namespaces similar to thor, it only adds one rule:
     #
-      # Returns a value representing the "cost" of transforming str1 into str2
-      def self.levenshtein_distance(str1, str2)
-        s = str1
-        t = str2
-        n = s.length
-        m = t.length
+    # Generators names must end with "_generator.rb". This is required because Rails
+    # looks in load paths and loads the generator just before it's going to be used.
+    #
+    #   find_by_namespace :webrat, :rails, :integration
+    #
+    # Will search for the following generators:
+    #
+    #   "rails:webrat", "webrat:integration", "webrat"
+    #
+    # Notice that "rails:generators:webrat" could be loaded as well, what
+    # Rails looks for is the first and last parts of the namespace.
+    def self.find_by_namespace(name, base = nil, context = nil) #:nodoc:
+      lookups = []
+      lookups << "#{base}:#{name}"    if base
+      lookups << "#{name}:#{context}" if context
 
-        return m if (0 == n)
-        return n if (0 == m)
-
-        d = (0..m).to_a
-        x = nil
-
-        # avoid duplicating an enumerable object in the loop
-        str2_codepoint_enumerable = str2.each_codepoint
-
-        str1.each_codepoint.with_index do |char1, i|
-          e = i+1
-
-          str2_codepoint_enumerable.with_index do |char2, j|
-            cost = (char1 == char2) ? 0 : 1
-            x = [
-                 d[j+1] + 1, # insertion
-                 e + 1,      # deletion
-                 d[j] + cost # substitution
-                ].min
-            d[j] = e
-            e = x
+      unless base || context
+        unless name.to_s.include?(?:)
+          lookups << "#{name}:#{name}"
+          lookups << "rails:#{name}"
+        end
+        lookups << "#{name}"
       end
 
-          d[m] = x
+      lookup(lookups)
+
+      namespaces = Hash[subclasses.map { |klass| [klass.namespace, klass] }]
+      lookups.each do |namespace|
+
+        klass = namespaces[namespace]
+        return klass if klass
       end
 
-        x
+      invoke_fallbacks_for(name, base) || invoke_fallbacks_for(context, name)
     end
 
-      # Prints a list of generators.
-      def self.print_list(base, namespaces) #:nodoc:
-        namespaces = namespaces.reject do |n|
-          hidden_namespaces.include?(n)
+    # Receives a namespace, arguments and the behavior to invoke the generator.
+    # It's used as the default entry point for generate, destroy and update
+    # commands.
+    def self.invoke(namespace, args=ARGV, config={})
+      names = namespace.to_s.split(":")
+      if klass = find_by_namespace(names.pop, names.any? && names.join(":"))
+        args << "--help" if args.empty? && klass.arguments.any?(&:required?)
+        klass.start(args, config)
+      else
+        options     = sorted_groups.flat_map(&:last)
+        suggestions = options.sort_by { |suggested| levenshtein_distance(namespace.to_s, suggested) }.first(3)
+        msg =  "Could not find generator '#{namespace}'. "
+        msg << "Maybe you meant #{ suggestions.map { |s| "'#{s}'" }.to_sentence(last_word_connector: " or ", locale: :en) }\n"
+        msg << "Run `rails generate --help` for more options."
+        puts msg
+      end
     end
 
-        return if namespaces.empty?
-        puts "#{base.camelize}:"
-
-        namespaces.each do |namespace|
-          puts("  #{namespace}")
-        end
-
-        puts
+    protected
+      def self.print_list(base, namespaces)
+        namespaces = namespaces.reject { |n| hidden_namespaces.include?(n) }
+        super
       end
 
       # Try fallbacks for the given base.
@@ -348,53 +297,16 @@ module Rails
         nil
       end
 
-      # Receives namespaces in an array and tries to find matching generators
-      # in the load path.
-      def self.lookup(namespaces) #:nodoc:
-        paths = namespaces_to_paths(namespaces)
-
-        paths.each do |raw_path|
-          ["rails/generators", "generators"].each do |base|
-            path = "#{base}/#{raw_path}_generator"
-
-            begin
-              require path
-              return
-            rescue LoadError => e
-              raise unless e.message =~ /#{Regexp.escape(path)}$/
-            rescue Exception => e
-              warn "[WARNING] Could not load generator #{path.inspect}. Error: #{e.message}.\n#{e.backtrace.join("\n")}"
-            end
-          end
-        end
+      def self.command_type
+        @command_type ||= "generator"
       end
 
-      # This will try to load any generator in the load path to show in help.
-      def self.lookup! #:nodoc:
-        $LOAD_PATH.each do |base|
-          Dir[File.join(base, "{rails/generators,generators}", "**", "*_generator.rb")].each do |path|
-            begin
-              path = path.sub("#{base}/", "")
-              require path
-            rescue Exception
-              # No problem
-            end
-          end
-        end
+      def self.lookup_paths
+        @lookup_paths ||= %w( rails/generators generators )
       end
 
-      # Convert namespaces to paths by replacing ":" for "/" and adding
-      # an extra lookup. For example, "rails:model" should be searched
-      # in both: "rails/model/model_generator" and "rails/model_generator".
-      def self.namespaces_to_paths(namespaces) #:nodoc:
-        paths = []
-        namespaces.each do |namespace|
-          pieces = namespace.split(":")
-          paths << pieces.dup.push(pieces.last).join("/")
-          paths << pieces.join("/")
-        end
-        paths.uniq!
-        paths
+      def self.file_lookup_paths
+        @file_lookup_paths ||= [ "{#{lookup_paths.join(',')}}", "**", "*_generator.rb" ]
       end
   end
 end

railties/lib/rails/test_unit/minitest_plugin.rb

@@ -1,4 +1,5 @@
 require "active_support/core_ext/module/attribute_accessors"
+require "active_support/core_ext/hash/keys"
 require "rails/test_unit/reporter"
 require "rails/test_unit/test_requirer"
 require "shellwords"

railties/test/application/runner_test.rb

@@ -82,7 +82,7 @@ module ApplicationTests
     def test_runner_detects_bad_script_name
       output = Dir.chdir(app_path) { `bin/rails runner "iuiqwiourowe" 2>&1` }
       assert_not $?.success?
-      assert_match "undefined local variable or method `iuiqwiourowe' for main:Object", output
+      assert_match "undefined local variable or method `iuiqwiourowe' for", output
     end
 
     def test_environment_with_rails_env