From 2105efbf51f2cc3888d4eefceae5b93d038c000c Mon Sep 17 00:00:00 2001
From: James Cox <james@imaj.es>
Date: Tue, 22 Jan 2019 11:01:43 -0500
Subject: [PATCH] New approach for awesomeprint -- this uses a factory pattern
 to register formatters as they go. wip.

---
 .gitignore                                    |   1 +
 .rspec                                        |   1 +
 .travis.yml                                   |   4 +-
 CHANGELOG.md                                  |   2 +
 awesome_print.gemspec                         |   2 +
 lib/awesome_print.rb                          |  36 ++---
 lib/awesome_print/colorize.rb                 |   2 +
 lib/awesome_print/ext/ostruct.rb              |  27 ----
 lib/awesome_print/formatter.rb                | 137 ++++--------------
 .../formatters/array_formatter.rb             |  17 ++-
 .../formatters/base_formatter.rb              |  65 ++-------
 .../formatters/bigdecimal_formatter.rb        |  19 +++
 .../formatters/class_formatter.rb             |  11 +-
 lib/awesome_print/formatters/dir_formatter.rb |  10 +-
 .../formatters/fallback_formatter.rb          |  51 +++++++
 .../formatters/false_class_formatter.rb       |  15 ++
 .../formatters/file_formatter.rb              |  10 +-
 .../formatters/hash_formatter.rb              |  17 ++-
 .../formatters/integer_formatter.rb           |  11 ++
 .../formatters/method_formatter.rb            |  11 +-
 .../formatters/nil_class_formatter.rb         |  19 +++
 .../formatters/object_formatter.rb            |  16 +-
 lib/awesome_print/formatters/open_struct.rb   |  19 +++
 .../formatters/rational_formatter.rb          |  11 ++
 .../formatters/simple_formatter.rb            |  14 +-
 .../formatters/string_formatter.rb            |  11 ++
 .../formatters/struct_formatter.rb            |  16 +-
 .../formatters/symbol_formatter.rb            |  18 +++
 .../formatters/true_class_formatter.rb        |  15 ++
 lib/awesome_print/inspector.rb                |  17 +--
 lib/awesome_print/limiter.rb                  |  63 ++++++++
 lib/awesome_print/registrar.rb                |  20 +++
 spec/ext/ostruct_spec.rb                      |   1 +
 spec/formats_spec.rb                          |   2 +-
 spec/spec_helper.rb                           |   2 +
 35 files changed, 418 insertions(+), 275 deletions(-)
 delete mode 100644 lib/awesome_print/ext/ostruct.rb
 create mode 100644 lib/awesome_print/formatters/bigdecimal_formatter.rb
 create mode 100644 lib/awesome_print/formatters/fallback_formatter.rb
 create mode 100644 lib/awesome_print/formatters/false_class_formatter.rb
 create mode 100644 lib/awesome_print/formatters/integer_formatter.rb
 create mode 100644 lib/awesome_print/formatters/nil_class_formatter.rb
 create mode 100644 lib/awesome_print/formatters/open_struct.rb
 create mode 100644 lib/awesome_print/formatters/rational_formatter.rb
 create mode 100644 lib/awesome_print/formatters/string_formatter.rb
 create mode 100644 lib/awesome_print/formatters/symbol_formatter.rb
 create mode 100644 lib/awesome_print/formatters/true_class_formatter.rb
 create mode 100644 lib/awesome_print/limiter.rb
 create mode 100644 lib/awesome_print/registrar.rb

diff --git a/.gitignore b/.gitignore
index 9a3813e..5ac8425 100644
--- a/.gitignore
+++ b/.gitignore
@@ -33,3 +33,4 @@ Gemfile.lock
 # PROJECT::RBENV
 .ruby-gemset
 .awesome-print/
+.byebug_history
diff --git a/.rspec b/.rspec
index 4e1e0d2..b7afd2d 100644
--- a/.rspec
+++ b/.rspec
@@ -1 +1,2 @@
+--format Fuubar
 --color
diff --git a/.travis.yml b/.travis.yml
index 5d9a377..c662e7c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,8 +24,8 @@ matrix:
   include:
     - rvm: ruby-head
       env: RUBYOPT="--enable-frozen-string-literal"
-  # allow_failures:
-  #   - rvm: ruby-head
+  allow_failures:
+    - rvm: ruby-head
 
 addons:
   code_climate:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 597aff8..6a68462 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,6 @@
 ## master (unreleased)
+
+## 2.0.0
   - Fixes spec suite to properly work via travis, gets a clean build [@imajes, others]
   - Adds support for ActiveModel::Errors [@dshinzie] - [#301]
   - removes use of `strip_heredoc` from specs as it's a rails dep [@kstephens] - [#303]
diff --git a/awesome_print.gemspec b/awesome_print.gemspec
index 25cce46..735a7ea 100644
--- a/awesome_print.gemspec
+++ b/awesome_print.gemspec
@@ -24,7 +24,9 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
 
   s.add_development_dependency 'rspec',  '>= 3.0.0'
+  s.add_development_dependency 'fuubar'
   s.add_development_dependency 'appraisal'
+  s.add_development_dependency 'byebug'
   s.add_development_dependency 'fakefs', '>= 0.2.1'
   s.add_development_dependency 'sqlite3'
   s.add_development_dependency 'nokogiri', '>= 1.6.5'
diff --git a/lib/awesome_print.rb b/lib/awesome_print.rb
index 06358a6..eeaa7a4 100644
--- a/lib/awesome_print.rb
+++ b/lib/awesome_print.rb
@@ -15,27 +15,29 @@ unless defined?(AwesomePrint::Inspector)
   require 'awesome_print/custom_defaults'
   require 'awesome_print/inspector'
   require 'awesome_print/formatter'
+  Dir["./lib/awesome_print/formatters/**/*.rb"].each { |f| require f }
+
   require 'awesome_print/version'
   require 'awesome_print/core_ext/logger' if defined?(Logger)
   #
   # Load the following under normal circumstances as well as in Rails
   # console when required from ~/.irbrc or ~/.pryrc.
   #
-  require 'awesome_print/ext/active_record'  if defined?(ActiveRecord)  || AwesomePrint.rails_console?
-  require 'awesome_print/ext/active_support' if defined?(ActiveSupport) || AwesomePrint.rails_console?
-  #
-  # Load remaining extensions.
-  #
-  if defined?(ActiveSupport.on_load)
-    ActiveSupport.on_load(:action_view) do
-      require 'awesome_print/ext/action_view'
-    end
-  end
-  require 'awesome_print/ext/mongo_mapper'   if defined?(MongoMapper)
-  require 'awesome_print/ext/mongoid'        if defined?(Mongoid)
-  require 'awesome_print/ext/nokogiri'       if defined?(Nokogiri)
-  require 'awesome_print/ext/nobrainer'      if defined?(NoBrainer)
-  require 'awesome_print/ext/ripple'         if defined?(Ripple)
-  require 'awesome_print/ext/sequel'         if defined?(Sequel)
-  require 'awesome_print/ext/ostruct'        if defined?(OpenStruct)
+  # require 'awesome_print/ext/active_record'  if defined?(ActiveRecord)  || AwesomePrint.rails_console?
+  # require 'awesome_print/ext/active_support' if defined?(ActiveSupport) || AwesomePrint.rails_console?
+  # #
+  # # Load remaining extensions.
+  # #
+  # if defined?(ActiveSupport.on_load)
+  #   ActiveSupport.on_load(:action_view) do
+  #     require 'awesome_print/ext/action_view'
+  #   end
+  # end
+  # require 'awesome_print/ext/mongo_mapper'   if defined?(MongoMapper)
+  # require 'awesome_print/ext/mongoid'        if defined?(Mongoid)
+  # require 'awesome_print/ext/nokogiri'       if defined?(Nokogiri)
+  # require 'awesome_print/ext/nobrainer'      if defined?(NoBrainer)
+  # require 'awesome_print/ext/ripple'         if defined?(Ripple)
+  # require 'awesome_print/ext/sequel'         if defined?(Sequel)
+  # require 'awesome_print/ext/ostruct'        if defined?(OpenStruct)
 end
diff --git a/lib/awesome_print/colorize.rb b/lib/awesome_print/colorize.rb
index f9adaf1..70e3335 100644
--- a/lib/awesome_print/colorize.rb
+++ b/lib/awesome_print/colorize.rb
@@ -6,6 +6,8 @@ module AwesomePrint
     # Pick the color and apply it to the given string as necessary.
     #------------------------------------------------------------------------------
     def colorize(str, type)
+      puts "[COLORIZING] - using #{options[:color][type]} for #{type}"
+
       str = CGI.escapeHTML(str) if options[:html]
       if options[:plain] || !options[:color][type] || !inspector.colorize?
         str
diff --git a/lib/awesome_print/ext/ostruct.rb b/lib/awesome_print/ext/ostruct.rb
deleted file mode 100644
index 0d89819..0000000
--- a/lib/awesome_print/ext/ostruct.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-# Copyright (c) 2010-2016 Michael Dvorkin and contributors
-#
-# Awesome Print is freely distributable under the terms of MIT license.
-# See LICENSE file or http://www.opensource.org/licenses/mit-license.php
-#------------------------------------------------------------------------------
-module AwesomePrint
-  module OpenStruct
-    def self.included(base)
-      base.send :alias_method, :cast_without_ostruct, :cast
-      base.send :alias_method, :cast, :cast_with_ostruct
-    end
-
-    def cast_with_ostruct(object, type)
-      cast = cast_without_ostruct(object, type)
-      if (defined?(::OpenStruct)) && (object.is_a?(::OpenStruct))
-        cast = :open_struct_instance
-      end
-      cast
-    end
-
-    def awesome_open_struct_instance(object)
-      "#{object.class} #{awesome_hash(object.marshal_dump)}"
-    end
-  end
-end
-
-AwesomePrint::Formatter.send(:include, AwesomePrint::OpenStruct)
diff --git a/lib/awesome_print/formatter.rb b/lib/awesome_print/formatter.rb
index 5090138..49cae34 100644
--- a/lib/awesome_print/formatter.rb
+++ b/lib/awesome_print/formatter.rb
@@ -1,126 +1,53 @@
-# Copyright (c) 2010-2016 Michael Dvorkin and contributors
-#
-# Awesome Print is freely distributable under the terms of MIT license.
-# See LICENSE file or http://www.opensource.org/licenses/mit-license.php
-#------------------------------------------------------------------------------
-require 'awesome_print/formatters'
+require_relative 'colorize'
 
 module AwesomePrint
   class Formatter
+
     include Colorize
 
     attr_reader :inspector, :options
 
-    CORE_FORMATTERS = [:array, :bigdecimal, :class, :dir, :file, :hash, :method, :rational, :set, :struct, :unboundmethod]
+    # Acts as a class ivar
+    @registered_formatters = {}
+
+    # make it accessible
+    def self.registered_formatters
+      @registered_formatters
+    end
+
+    # register a new formatter..
+    #------------------------------------------------------------------------------
+    def self.register(formatter)
+      @registered_formatters[formatter.formatted_object_type.to_sym] = formatter
+    end
 
     def initialize(inspector)
-      @inspector   = inspector
-      @options     = inspector.options
+      @inspector = inspector
+      @options   = inspector.options
     end
 
+
     # Main entry point to format an object.
+    # type is determined by Inspector#printable
     #------------------------------------------------------------------------------
     def format(object, type = nil)
-      core_class = cast(object, type)
-      awesome = if core_class != :self
-        send(:"awesome_#{core_class}", object) # Core formatters.
+      puts "[FORMAT] #{type.to_s.red} >>> #{object}"
+
+      format_with = active_formatter(type)
+      puts "[ACTIVE] using > #{format_with.to_s.blueish} < to format"
+
+      if format_with && format_with.send(:formattable?, object)
+        format_with.new(@inspector).format(object)
       else
-        awesome_self(object, type) # Catch all that falls back to object.inspect.
-      end
-      awesome
-    end
-
-    # Hook this when adding custom formatters. Check out lib/awesome_print/ext
-    # directory for custom formatters that ship with awesome_print.
-    #------------------------------------------------------------------------------
-    def cast(object, type)
-      CORE_FORMATTERS.include?(type) ? type : :self
-    end
-
-    private
-
-    # Catch all method to format an arbitrary object.
-    #------------------------------------------------------------------------------
-    def awesome_self(object, type)
-      if @options[:raw] && object.instance_variables.any?
-        awesome_object(object)
-      elsif (hash = convert_to_hash(object))
-        awesome_hash(hash)
-      else
-        awesome_simple(object.inspect.to_s, type, @inspector)
+        puts "[FALLBACK] well darn, we're just gonna have to fb"
+        # in this case, formatter is missing or fails format test
+        AwesomePrint::Formatters::FallbackFormatter.new(@inspector).format(object)
       end
     end
 
-    def awesome_bigdecimal(n)
-      o = n.to_s('F')
-      type = :bigdecimal
-      awesome_simple(o, type, @inspector)
-    end
-
-    def awesome_rational(n)
-      o = n.to_s
-      type = :rational
-      awesome_simple(o, type, @inspector)
-    end
-
-    def awesome_simple(o, type, inspector = @inspector)
-      AwesomePrint::Formatters::SimpleFormatter.new(o, type, inspector).format
-    end
-
-    def awesome_array(a)
-      Formatters::ArrayFormatter.new(a, @inspector).format
-    end
-
-    def awesome_set(s)
-      Formatters::ArrayFormatter.new(s.to_a, @inspector).format
-    end
-
-    def awesome_hash(h)
-      Formatters::HashFormatter.new(h, @inspector).format
-    end
-
-    def awesome_object(o)
-      Formatters::ObjectFormatter.new(o, @inspector).format
-    end
-
-    def awesome_struct(s)
-      Formatters::StructFormatter.new(s, @inspector).format
-    end
-
-    def awesome_method(m)
-      Formatters::MethodFormatter.new(m, @inspector).format
-    end
-    alias :awesome_unboundmethod :awesome_method
-
-    def awesome_class(c)
-      Formatters::ClassFormatter.new(c, @inspector).format
-    end
-
-    def awesome_file(f)
-      Formatters::FileFormatter.new(f, @inspector).format
-    end
-
-    def awesome_dir(d)
-      Formatters::DirFormatter.new(d, @inspector).format
-    end
-
-    # Utility methods.
-    #------------------------------------------------------------------------------
-    def convert_to_hash(object)
-      if !object.respond_to?(:to_hash)
-        return nil
-      end
-
-      if object.method(:to_hash).arity != 0
-        return nil
-      end
-
-      hash = object.to_hash
-      if !hash.respond_to?(:keys) || !hash.respond_to?('[]')
-        return nil
-      end
-
-      return hash
+    def active_formatter(type)
+      self.class.registered_formatters[type]
     end
   end
 end
+
diff --git a/lib/awesome_print/formatters/array_formatter.rb b/lib/awesome_print/formatters/array_formatter.rb
index 3340a77..5381594 100644
--- a/lib/awesome_print/formatters/array_formatter.rb
+++ b/lib/awesome_print/formatters/array_formatter.rb
@@ -3,16 +3,19 @@ require_relative 'base_formatter'
 module AwesomePrint
   module Formatters
     class ArrayFormatter < BaseFormatter
-      attr_reader :array, :inspector, :options
 
-      def initialize(array, inspector)
-        @array = array
-        @inspector = inspector
-        @options = inspector.options
+      formatter_for :array
+
+      def self.formattable?(object)
+        object.is_a?(Array)
       end
 
-      def format
-        if array.length.zero?
+      attr_reader :array
+
+      def format(object)
+        @array = object
+
+        if object.length.zero?
           '[]'
         elsif methods_array?
           methods_array
diff --git a/lib/awesome_print/formatters/base_formatter.rb b/lib/awesome_print/formatters/base_formatter.rb
index c7f71c6..61897a1 100644
--- a/lib/awesome_print/formatters/base_formatter.rb
+++ b/lib/awesome_print/formatters/base_formatter.rb
@@ -1,68 +1,26 @@
 require_relative '../colorize'
+require_relative '../limiter'
+require_relative '../registrar'
 
 module AwesomePrint
   module Formatters
     class BaseFormatter
+
       include Colorize
+      include Registrar
+      include Limiter
 
-      DEFAULT_LIMIT_SIZE = 7
+      attr_reader :object, :inspector, :options
 
-      # To support limited output, for example:
-      #
-      # ap ('a'..'z').to_a, :limit => 3
-      # [
-      #     [ 0] "a",
-      #     [ 1] .. [24],
-      #     [25] "z"
-      # ]
-      #
-      # ap (1..100).to_a, :limit => true # Default limit is 7.
-      # [
-      #     [ 0] 1,
-      #     [ 1] 2,
-      #     [ 2] 3,
-      #     [ 3] .. [96],
-      #     [97] 98,
-      #     [98] 99,
-      #     [99] 100
-      # ]
-      #------------------------------------------------------------------------------
-      def should_be_limited?
-        options[:limit] or (options[:limit].is_a?(Integer) and options[:limit] > 0)
+      def initialize(inspector)
+        @inspector = inspector
+        @options = inspector.options
       end
 
-      def get_limit_size
-        case options[:limit]
-        when true
-          DEFAULT_LIMIT_SIZE
-        else
-          options[:limit]
-        end
+      def format(object)
+        raise NotImplementedError
       end
 
-      def limited(data, width, is_hash = false)
-        limit = get_limit_size
-        if data.length <= limit
-          data
-        else
-          # Calculate how many elements to be displayed above and below the separator.
-          head = limit / 2
-          tail = head - (limit - 1) % 2
-
-          # Add the proper elements to the temp array and format the separator.
-          temp = data[0, head] + [nil] + data[-tail, tail]
-
-          temp[head] = if is_hash
-                         "#{indent}#{data[head].strip} .. #{data[data.length - tail - 1].strip}"
-                       else
-                         "#{indent}[#{head.to_s.rjust(width)}] .. [#{data.length - tail - 1}]"
-                       end
-
-          temp
-        end
-      end
-
-
       def method_tuple(method)
         if method.respond_to?(:parameters) # Ruby 1.9.2+
           # See http://readruby.chengguangnan.com/methods#method-objects-parameters
@@ -104,6 +62,7 @@ module AwesomePrint
 
       #
       # Indentation related methods
+      # FIXME: move to Indentator?...
       #-----------------------------------------
       def indentation
         inspector.current_indentation
diff --git a/lib/awesome_print/formatters/bigdecimal_formatter.rb b/lib/awesome_print/formatters/bigdecimal_formatter.rb
new file mode 100644
index 0000000..a626b93
--- /dev/null
+++ b/lib/awesome_print/formatters/bigdecimal_formatter.rb
@@ -0,0 +1,19 @@
+require_relative 'base_formatter'
+
+module AwesomePrint
+  module Formatters
+    class BigdecimalFormatter < BaseFormatter
+
+      formatter_for :bigdecimal
+
+      def self.formattable?(object)
+        true
+      end
+
+      def format(object)
+        colorize(object.to_s('F'), self.class.formatted_object_type)
+      end
+
+    end
+  end
+end
diff --git a/lib/awesome_print/formatters/class_formatter.rb b/lib/awesome_print/formatters/class_formatter.rb
index d5082ea..417aced 100644
--- a/lib/awesome_print/formatters/class_formatter.rb
+++ b/lib/awesome_print/formatters/class_formatter.rb
@@ -4,16 +4,15 @@ module AwesomePrint
   module Formatters
     class ClassFormatter < BaseFormatter
 
-      attr_reader :klass, :inspector, :options
+      formatter_for :class
 
-      def initialize(klass, inspector)
-        @klass = klass
-        @inspector = inspector
-        @options = inspector.options
+      def self.formattable?(object)
+        object.is_a?(Class)
       end
 
-      def format
+      def format(klass)
         superclass = klass.superclass
+
         if superclass
           colorize("#{klass.inspect} < #{superclass}", :class)
         else
diff --git a/lib/awesome_print/formatters/dir_formatter.rb b/lib/awesome_print/formatters/dir_formatter.rb
index 0b1bc7b..69bff1d 100644
--- a/lib/awesome_print/formatters/dir_formatter.rb
+++ b/lib/awesome_print/formatters/dir_formatter.rb
@@ -5,15 +5,13 @@ module AwesomePrint
   module Formatters
     class DirFormatter < BaseFormatter
 
-      attr_reader :dir, :inspector, :options
+      formatter_for :dir
 
-      def initialize(dir, inspector)
-        @dir = dir
-        @inspector = inspector
-        @options = inspector.options
+      def self.formattable?(object)
+        object.is_a?(Dir)
       end
 
-      def format
+      def format(dir)
         ls = `ls -alF #{dir.path.shellescape}`
         colorize(ls.empty? ? dir.inspect : "#{dir.inspect}\n#{ls.chop}", :dir)
       end
diff --git a/lib/awesome_print/formatters/fallback_formatter.rb b/lib/awesome_print/formatters/fallback_formatter.rb
new file mode 100644
index 0000000..083e298
--- /dev/null
+++ b/lib/awesome_print/formatters/fallback_formatter.rb
@@ -0,0 +1,51 @@
+require_relative 'base_formatter'
+
+# this handles some fallback logic to route things we don't know what they are
+
+module AwesomePrint
+  module Formatters
+    class FallbackFormatter < BaseFormatter
+
+      formatter_for :self
+
+      def self.formattable?(object)
+        true
+      end
+
+      def format(object)
+        if @options[:raw] && object.instance_variables.any?
+          Formatters::ObjectFormatter.new(@inspector).format(object)
+        elsif (hash = convert_to_hash(object))
+          Formatters::HashFormatter.new(@inspector).format(hash)
+        else
+          Formatters::SimpleFormatter.new(@inspector).format(object.inspect.to_s)
+        end
+      end
+
+
+      private
+
+      # Utility methods.
+      #------------------------------------------------------------------------------
+      # FIXME: this could be super fixed.
+      #
+      def convert_to_hash(object)
+        if !object.respond_to?(:to_hash)
+          return nil
+        end
+
+        if object.method(:to_hash).arity != 0
+          return nil
+        end
+
+        hash = object.to_hash
+        if !hash.respond_to?(:keys) || !hash.respond_to?('[]')
+          return nil
+        end
+
+        return hash
+      end
+
+    end
+  end
+end
diff --git a/lib/awesome_print/formatters/false_class_formatter.rb b/lib/awesome_print/formatters/false_class_formatter.rb
new file mode 100644
index 0000000..f069cf4
--- /dev/null
+++ b/lib/awesome_print/formatters/false_class_formatter.rb
@@ -0,0 +1,15 @@
+require_relative 'simple_formatter'
+
+module AwesomePrint
+  module Formatters
+    class FalseClassFormatter < SimpleFormatter
+
+      formatter_for :falseclass
+
+      def self.formattable?(object)
+        object == false
+      end
+
+    end
+  end
+end
diff --git a/lib/awesome_print/formatters/file_formatter.rb b/lib/awesome_print/formatters/file_formatter.rb
index 68c59da..10d97e4 100644
--- a/lib/awesome_print/formatters/file_formatter.rb
+++ b/lib/awesome_print/formatters/file_formatter.rb
@@ -5,15 +5,13 @@ module AwesomePrint
   module Formatters
     class FileFormatter < BaseFormatter
 
-      attr_reader :file, :inspector, :options
+      formatter_for :file
 
-      def initialize(file, inspector)
-        @file = file
-        @inspector = inspector
-        @options = inspector.options
+      def self.formattable?(object)
+        object.is_a?(File)
       end
 
-      def format
+      def format(file)
         ls = File.directory?(file) ? `ls -adlF #{file.path.shellescape}` : `ls -alF #{file.path.shellescape}`
         colorize(ls.empty? ? file.inspect : "#{file.inspect}\n#{ls.chop}", :file)
       end
diff --git a/lib/awesome_print/formatters/hash_formatter.rb b/lib/awesome_print/formatters/hash_formatter.rb
index c29bb63..9228cf0 100644
--- a/lib/awesome_print/formatters/hash_formatter.rb
+++ b/lib/awesome_print/formatters/hash_formatter.rb
@@ -3,15 +3,20 @@ require_relative 'base_formatter'
 module AwesomePrint
   module Formatters
     class HashFormatter < BaseFormatter
-      attr_reader :hash, :inspector, :options
 
-      def initialize(hash, inspector)
-        @hash = hash
-        @inspector = inspector
-        @options = inspector.options
+      attr_reader :hash
+
+      formatter_for :hash
+
+      def self.formattable?(object)
+        object.is_a?(Hash)
       end
 
-      def format
+      # INSTANCE METHODS BELOW
+
+      def format(hash)
+        @hash = hash
+
         if hash.empty?
           empty_hash
         elsif multiline_hash?
diff --git a/lib/awesome_print/formatters/integer_formatter.rb b/lib/awesome_print/formatters/integer_formatter.rb
new file mode 100644
index 0000000..b69cef1
--- /dev/null
+++ b/lib/awesome_print/formatters/integer_formatter.rb
@@ -0,0 +1,11 @@
+require_relative 'simple_formatter'
+
+module AwesomePrint
+  module Formatters
+    class IntegerFormatter < SimpleFormatter
+
+      formatter_for :integer
+
+    end
+  end
+end
diff --git a/lib/awesome_print/formatters/method_formatter.rb b/lib/awesome_print/formatters/method_formatter.rb
index 26c398d..a61312f 100644
--- a/lib/awesome_print/formatters/method_formatter.rb
+++ b/lib/awesome_print/formatters/method_formatter.rb
@@ -4,15 +4,14 @@ module AwesomePrint
   module Formatters
     class MethodFormatter < BaseFormatter
 
-      attr_reader :method, :inspector, :options
+      formatter_for :method
 
-      def initialize(method, inspector)
-        @method = method
-        @inspector = inspector
-        @options = inspector.options
+      def self.formattable?(object)
+        puts "formattable? for METHOD..."
+        true
       end
 
-      def format
+      def format(method)
         name, args, owner = method_tuple(method)
 
         "#{colorize(owner, :class)}##{colorize(name, :method)}#{colorize(args, :args)}"
diff --git a/lib/awesome_print/formatters/nil_class_formatter.rb b/lib/awesome_print/formatters/nil_class_formatter.rb
new file mode 100644
index 0000000..5abf5cf
--- /dev/null
+++ b/lib/awesome_print/formatters/nil_class_formatter.rb
@@ -0,0 +1,19 @@
+require_relative 'simple_formatter'
+
+module AwesomePrint
+  module Formatters
+    class NilClassFormatter < SimpleFormatter
+
+      formatter_for :nilclass
+
+      def self.formattable?(object)
+        object == nil
+      end
+
+      def format(object)
+        colorize('nil', self.class.formatted_object_type)
+      end
+
+    end
+  end
+end
diff --git a/lib/awesome_print/formatters/object_formatter.rb b/lib/awesome_print/formatters/object_formatter.rb
index 49334f7..0b0b344 100644
--- a/lib/awesome_print/formatters/object_formatter.rb
+++ b/lib/awesome_print/formatters/object_formatter.rb
@@ -4,16 +4,18 @@ module AwesomePrint
   module Formatters
     class ObjectFormatter < BaseFormatter
 
-      attr_reader :object, :variables, :inspector, :options
+      formatter_for :object
 
-      def initialize(object, inspector)
-        @object = object
-        @variables = object.instance_variables
-        @inspector = inspector
-        @options = inspector.options
+      def self.formattable?(object)
+        object.is_a?(Object)
       end
 
-      def format
+      attr_reader :variables
+
+      def format(object)
+        @object = object
+        @variables = object.instance_variables
+
         vars = variables.map do |var|
           property = var.to_s[1..-1].to_sym # to_s because of some monkey patching done by Puppet.
           accessor = if object.respond_to?(:"#{property}=")
diff --git a/lib/awesome_print/formatters/open_struct.rb b/lib/awesome_print/formatters/open_struct.rb
new file mode 100644
index 0000000..6d9674c
--- /dev/null
+++ b/lib/awesome_print/formatters/open_struct.rb
@@ -0,0 +1,19 @@
+require_relative 'base_formatter'
+
+module AwesomePrint
+  module Formatters
+    class OpenStruct < BaseFormatter
+
+      formatter_for :openstruct
+
+      def self.formattable?(object)
+        defined?(::OpenStruct) && object.is_a?(::OpenStruct)
+      end
+
+      def format(object)
+        "#{object.class} #{HashFormatter.new(inspector).format(object.marshal_dump)}"
+      end
+
+    end
+  end
+end
diff --git a/lib/awesome_print/formatters/rational_formatter.rb b/lib/awesome_print/formatters/rational_formatter.rb
new file mode 100644
index 0000000..c91e632
--- /dev/null
+++ b/lib/awesome_print/formatters/rational_formatter.rb
@@ -0,0 +1,11 @@
+require_relative 'simple_formatter'
+
+module AwesomePrint
+  module Formatters
+    class RationalFormatter < SimpleFormatter
+
+      formatter_for :rational
+
+    end
+  end
+end
diff --git a/lib/awesome_print/formatters/simple_formatter.rb b/lib/awesome_print/formatters/simple_formatter.rb
index bdd274f..04d403e 100644
--- a/lib/awesome_print/formatters/simple_formatter.rb
+++ b/lib/awesome_print/formatters/simple_formatter.rb
@@ -4,18 +4,16 @@ module AwesomePrint
   module Formatters
     class SimpleFormatter < BaseFormatter
 
-      attr_reader :string, :type, :inspector, :options
+      formatter_for :simple
 
-      def initialize(string, type, inspector)
-        @string = string
-        @type = type
-        @inspector = inspector
-        @options = inspector.options
+      def self.formattable?(object)
+        object.respond_to?(:to_s)
       end
 
-      def format
-        colorize(string, type)
+      def format(object)
+        colorize(object.to_s, self.class.formatted_object_type)
       end
+
     end
   end
 end
diff --git a/lib/awesome_print/formatters/string_formatter.rb b/lib/awesome_print/formatters/string_formatter.rb
new file mode 100644
index 0000000..7beaf62
--- /dev/null
+++ b/lib/awesome_print/formatters/string_formatter.rb
@@ -0,0 +1,11 @@
+require_relative 'simple_formatter'
+
+module AwesomePrint
+  module Formatters
+    class StringFormatter < SimpleFormatter
+
+      formatter_for :string
+
+    end
+  end
+end
diff --git a/lib/awesome_print/formatters/struct_formatter.rb b/lib/awesome_print/formatters/struct_formatter.rb
index 18bebaa..66ecf4f 100644
--- a/lib/awesome_print/formatters/struct_formatter.rb
+++ b/lib/awesome_print/formatters/struct_formatter.rb
@@ -4,16 +4,18 @@ module AwesomePrint
   module Formatters
     class StructFormatter < BaseFormatter
 
-      attr_reader :struct, :variables, :inspector, :options
+      formatter_for :struct
 
-      def initialize(struct, inspector)
-        @struct = struct
-        @variables = struct.members
-        @inspector = inspector
-        @options = inspector.options
+      def self.formattable?(object)
+        object.is_a?(Struct)
       end
 
-      def format
+      attr_reader :struct, :variables
+
+      def format(struct)
+        @struct = struct
+        @variables = struct.members
+
         vars = variables.map do |var|
           property = var.to_s[1..-1].to_sym # to_s because of some monkey patching done by Puppet.
           accessor = if struct.respond_to?(:"#{property}=")
diff --git a/lib/awesome_print/formatters/symbol_formatter.rb b/lib/awesome_print/formatters/symbol_formatter.rb
new file mode 100644
index 0000000..c97561b
--- /dev/null
+++ b/lib/awesome_print/formatters/symbol_formatter.rb
@@ -0,0 +1,18 @@
+require_relative 'simple_formatter'
+
+module AwesomePrint
+  module Formatters
+    class SymbolFormatter < SimpleFormatter
+
+      formatter_for :symbol
+
+      def self.formattable?(object)
+        object.respond_to?(:to_s)
+      end
+
+      def format(object)
+        colorize(object.to_s, self.class.formatted_object_type)
+      end
+    end
+  end
+end
diff --git a/lib/awesome_print/formatters/true_class_formatter.rb b/lib/awesome_print/formatters/true_class_formatter.rb
new file mode 100644
index 0000000..de46697
--- /dev/null
+++ b/lib/awesome_print/formatters/true_class_formatter.rb
@@ -0,0 +1,15 @@
+require_relative 'simple_formatter'
+
+module AwesomePrint
+  module Formatters
+    class TrueClassFormatter < SimpleFormatter
+
+      formatter_for :trueclass
+
+      def self.formattable?(object)
+        object == true
+      end
+
+    end
+  end
+end
diff --git a/lib/awesome_print/inspector.rb b/lib/awesome_print/inspector.rb
index 3c3fe11..a98b2d7 100644
--- a/lib/awesome_print/inspector.rb
+++ b/lib/awesome_print/inspector.rb
@@ -42,6 +42,7 @@ module AwesomePrint
           rational:   :blue,
           string:     :yellowish,
           struct:     :pale,
+          openstruct: :pale,
           symbol:     :cyanish,
           time:       :greenish,
           trueclass:  :green,
@@ -106,9 +107,10 @@ module AwesomePrint
     #---------------------------------------------------------------------------
     def nested(object)
       case printable(object)
-      when :array  then @formatter.colorize('[...]', :array)
-      when :hash   then @formatter.colorize('{...}', :hash)
-      when :struct then @formatter.colorize('{...}', :struct)
+      when :array   then @formatter.colorize('[...]', :array)
+      when :hash    then @formatter.colorize('{...}', :hash)
+      when :struct  then @formatter.colorize('{...}', :struct)
+      when :openstruct then @formatter.colorize('{...}', :openstruct)
       else @formatter.colorize("...#{object.class}...", :class)
       end
     end
@@ -123,14 +125,7 @@ module AwesomePrint
     # base class.
     #---------------------------------------------------------------------------
     def printable(object)
-      case object
-      when Array  then :array
-      when Hash   then :hash
-      when File   then :file
-      when Dir    then :dir
-      when Struct then :struct
-      else object.class.to_s.gsub(/:+/, '_').downcase.to_sym
-      end
+      object.class.to_s.gsub(/:+/, '_').downcase.to_sym
     end
 
     # Update @options by first merging the :color hash and then the remaining
diff --git a/lib/awesome_print/limiter.rb b/lib/awesome_print/limiter.rb
new file mode 100644
index 0000000..4c609b1
--- /dev/null
+++ b/lib/awesome_print/limiter.rb
@@ -0,0 +1,63 @@
+module AwesomePrint
+  module Limiter
+
+      DEFAULT_LIMIT_SIZE = 7
+
+      # To support limited output, for example:
+      #
+      # ap ('a'..'z').to_a, :limit => 3
+      # [
+      #     [ 0] "a",
+      #     [ 1] .. [24],
+      #     [25] "z"
+      # ]
+      #
+      # ap (1..100).to_a, :limit => true # Default limit is 7.
+      # [
+      #     [ 0] 1,
+      #     [ 1] 2,
+      #     [ 2] 3,
+      #     [ 3] .. [96],
+      #     [97] 98,
+      #     [98] 99,
+      #     [99] 100
+      # ]
+      #------------------------------------------------------------------------------
+      def should_be_limited?
+        options[:limit] or (options[:limit].is_a?(Integer) and options[:limit] > 0)
+      end
+
+      def get_limit_size
+        case options[:limit]
+        when true
+          DEFAULT_LIMIT_SIZE
+        else
+          options[:limit]
+        end
+      end
+
+      def limited(data, width, is_hash = false)
+        limit = get_limit_size
+        if data.length <= limit
+          data
+        else
+          # Calculate how many elements to be displayed above and below the separator.
+          head = limit / 2
+          tail = head - (limit - 1) % 2
+
+          # Add the proper elements to the temp array and format the separator.
+          temp = data[0, head] + [nil] + data[-tail, tail]
+
+          temp[head] = if is_hash
+                         "#{indent}#{data[head].strip} .. #{data[data.length - tail - 1].strip}"
+                       else
+                         "#{indent}[#{head.to_s.rjust(width)}] .. [#{data.length - tail - 1}]"
+                       end
+
+          temp
+        end
+      end
+
+
+  end
+end
diff --git a/lib/awesome_print/registrar.rb b/lib/awesome_print/registrar.rb
new file mode 100644
index 0000000..a63475e
--- /dev/null
+++ b/lib/awesome_print/registrar.rb
@@ -0,0 +1,20 @@
+module AwesomePrint
+  module Registrar
+
+    def self.included(base)
+      base.send(:extend, ClassMethods)
+    end
+
+    module ClassMethods
+
+      attr_accessor :formatted_object_type
+
+      def formatter_for(type)
+        self.formatted_object_type = type
+
+        AwesomePrint::Formatter.register(self)
+      end
+    end
+
+  end
+end
diff --git a/spec/ext/ostruct_spec.rb b/spec/ext/ostruct_spec.rb
index 55a4d33..27884ac 100644
--- a/spec/ext/ostruct_spec.rb
+++ b/spec/ext/ostruct_spec.rb
@@ -1,4 +1,5 @@
 require 'spec_helper'
+require 'ostruct'
 
 RSpec.describe 'AwesomePrint Ostruct extension' do
   before do
diff --git a/spec/formats_spec.rb b/spec/formats_spec.rb
index 9427b44..2f755e9 100644
--- a/spec/formats_spec.rb
+++ b/spec/formats_spec.rb
@@ -119,7 +119,7 @@ EOS
 EOS
     end
 
-    it 'colored single line' do
+    it 'colored single line', focus: true do
       expect(@arr.ai(multiline: false)).to eq("[ \e[1;34m1\e[0m, \e[0;36m:two\e[0m, \e[0;33m\"three\"\e[0m, [ \e[1;31mnil\e[0m, [ \e[1;32mtrue\e[0m, \e[1;31mfalse\e[0m ] ] ]")
     end
   end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index d2ef52b..a31568f 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -25,6 +25,8 @@ Dir[File.dirname(__FILE__) + '/support/**/*.rb'].each do |file|
   require file
 end
 
+require 'byebug'
+
 ExtVerifier.require_dependencies!(
   %w(
     rails