Add color input

Add an input for color picker

Browser support for color picker is still limited but I don't see a reason not to support it within simple_form

CHANGELOG.md

@@ -4,6 +4,7 @@
 * Guess input type more carefully. [@sringling](https://github.com/sringling)
 * Allow custom error on forms without model. [@victorperez](https://github.com/victorperez)
 * Do not support Ruby < 2.3 anymore. [@gssbzn](https://github.com/gssbzn)
+* Add color inout type. [@gssbzn](https://github.com/gssbzn)
 
 ### Bug fix
 * Improve disabled option to input_field. [@betelgeuse](https://github.com/betelgeuse)

lib/simple_form/inputs.rb

@@ -10,6 +10,7 @@ module Inputs
     autoload :CollectionInput
     autoload :CollectionRadioButtonsInput
     autoload :CollectionSelectInput
+    autoload :ColorInput
     autoload :DateTimeInput
     autoload :FileInput
     autoload :GroupedCollectionSelectInput

lib/simple_form/inputs/color_input.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+module SimpleForm
+  module Inputs
+    class ColorInput < Base
+      def input(wrapper_options = nil)
+        input_html_options[:type] ||= "color" if html5?
+
+        merged_input_options = merge_wrapper_options(input_html_options, wrapper_options)
+
+        @builder.text_field(attribute_name, merged_input_options)
+      end
+    end
+  end
+end

test/inputs/color_input_test.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class ColorInputTest < ActionView::TestCase
+  test 'input generates a color field' do
+    with_input_for @user, :favorite_color, :color
+    assert_select 'input[type=color].color#user_favorite_color'
+  end
+end

test/support/models.rb

@@ -91,7 +91,7 @@ class User
     :post_count, :lock_version, :amount, :attempts, :action, :credit_card, :gender,
     :extra_special_company_id, :pictures, :picture_ids, :special_pictures,
     :special_picture_ids, :uuid, :friends, :friend_ids, :special_tags, :special_tag_ids,
-    :citext, :hstore, :json, :jsonb, :hourly
+    :citext, :hstore, :json, :jsonb, :hourly, :favorite_color
 
   def self.build(extra_attributes = {})
     attributes = {