Improve coding standards

lib/producer/core/cli.rb

@@ -1,10 +1,10 @@
 module Producer
   module Core
     class CLI
-      attr_reader :arguments
-
       USAGE = "Usage: #{File.basename $0} recipe_file"
 
+      attr_reader :arguments
+
       def initialize(arguments, stdout = $stdout)
         @stdout     = stdout
         @arguments  = arguments

lib/producer/core/recipe.rb

@@ -1,12 +1,14 @@
 module Producer
   module Core
     class Recipe
-      attr_accessor :tasks
-
-      def self.evaluate_from_file(filepath, env)
-        DSL.evaluate(File.read(filepath), env)
+      class << self
+        def evaluate_from_file(filepath, env)
+          DSL.evaluate(File.read(filepath), env)
+        end
       end
 
+      attr_accessor :tasks
+
       def initialize(tasks = [])
         @tasks = tasks
       end

lib/producer/core/recipe/dsl.rb

@@ -2,13 +2,15 @@ module Producer
   module Core
     class Recipe
       class DSL
-        attr_reader :tasks
-
-        def self.evaluate(code, env)
-          dsl = new(code).evaluate(env)
-          Recipe.new(dsl.tasks)
+        class << self
+          def evaluate(code, env)
+            dsl = new(code).evaluate(env)
+            Recipe.new(dsl.tasks)
+          end
         end
 
+        attr_reader :tasks
+
         def initialize(code = nil, &block)
           @code   = code
           @block  = block

lib/producer/core/task.rb

@@ -1,12 +1,14 @@
 module Producer
   module Core
     class Task
-      attr_reader :name, :actions, :condition
-
-      def self.evaluate(name, env, &block)
-        DSL.evaluate(name, env, &block)
+      class << self
+        def evaluate(name, env, &block)
+          DSL.evaluate(name, env, &block)
+        end
       end
 
+      attr_reader :name, :actions, :condition
+
       def initialize(name, actions = [], condition = true)
         @name       = name
         @actions    = actions