Support to date, datetime and time inputs.

I changed `DateTimeInput` to support the new HTML5 form helpers that
comes with Rails 4 (`date_input`, `datetime_input` and `time_input`)
instead of rendering datetime selects:

For example, this input:
```erb
<%= f.input :born_on, as: :date %>
```
Will render:
```html
<input id="user_born_on" name="user[born_on]" type="date" />
```

Datetime selects are still present, but only when HTML5 compatibility
is disabled. It's also possible to render selects even with HTML5 on,
by setting the `html5` option to false.

If we wanted to use an old date select on the example above, we should do:
```erb
<%= f.input :born_on, as: :date, html5: false %>
```

Closes #844.

lib/simple_form/inputs/date_time_input.rb

@@ -1,8 +1,14 @@
 module SimpleForm
   module Inputs
     class DateTimeInput < Base
+      enable :html5
+
       def input
-        @builder.send(:"#{input_type}_select", attribute_name, input_options, input_html_options)
+        if use_html5_inputs?
+          @builder.send(:"#{input_type}_field", attribute_name, input_html_options)
+        else
+          @builder.send(:"#{input_type}_select", attribute_name, input_options, input_html_options)
+        end
       end
 
       private
@@ -19,6 +25,14 @@ module SimpleForm
         position = ActionView::Helpers::DateTimeSelector::POSITION[position]
         "#{attribute_name}_#{position}i"
       end
+
+      def use_html5_inputs?
+        if input_options.key?(:html5)
+          input_options[:html5]
+        else
+          html5?
+        end
+      end
     end
   end
 end

test/inputs/datetime_input_test.rb

@@ -1,18 +1,69 @@
 # encoding: UTF-8
 require 'test_helper'
 
-# Tests for all different kinds of inputs.
-class DateTimeInputTest < ActionView::TestCase
-  # DateTime input
-  test 'input should generate a datetime select by default for datetime attributes' do
+# Tests for datetime, date and time inputs when HTML5 compatibility is enabled in the wrapper.
+class DateTimeInputWithHtml5Test < ActionView::TestCase
+  test 'input should generate a datetime input for datetime attributes' do
     with_input_for @user, :created_at, :datetime
-    1.upto(5) do |i|
-      assert_select "form select.datetime#user_created_at_#{i}i"
+
+    assert_select 'input[type="datetime"]'
+  end
+
+  test 'input should generate a datetime select for datetime attributes if HTML5 compatibility is explicitly disabled' do
+    with_input_for @user, :created_at, :datetime, html5: false
+
+    assert_select 'select.datetime'
+  end
+
+  test 'input should generate a date input for date attributes' do
+    with_input_for @user, :born_at, :date
+
+    assert_select 'input[type="date"]'
+  end
+
+  test 'input should generate a date select for date attributes if HTML5 compatibility is explicitly disabled' do
+    with_input_for @user, :born_at, :date, html5: false
+
+    assert_select 'select.date'
+  end
+
+  test 'input should generate a time input for time attributes' do
+    with_input_for @user, :delivery_time, :time
+
+    assert_select 'input[type="time"]'
+  end
+
+  test 'input should generate a time select for time attributes if HTML5 compatibility is explicitly disabled' do
+    with_input_for @user, :delivery_time, :time, html5: false
+
+    assert_select 'select.time'
+  end
+
+  test 'input should generate required html attribute' do
+    with_input_for @user, :delivery_time, :time, required: true
+    assert_select 'input.required'
+    assert_select 'input[required]'
+  end
+
+  test 'input should have an aria-required html attribute' do
+    with_input_for @user, :delivery_time, :time, required: true
+    assert_select 'input[aria-required=true]'
+  end
+end
+
+# Tests for datetime, date and time inputs when HTML5 compatibility is enabled in the wrapper.
+class DateTimeInputWithoutHtml5Test < ActionView::TestCase
+  test 'input should generate a datetime select by default for datetime attributes' do
+    swap_wrapper do
+      with_input_for @user, :created_at, :datetime
+      1.upto(5) do |i|
+        assert_select "form select.datetime#user_created_at_#{i}i"
+      end
     end
   end
 
   test 'input should be able to pass options to datetime select' do
-    with_input_for @user, :created_at, :datetime,
+    with_input_for @user, :created_at, :datetime, html5: false,
       disabled: true, prompt: { year: 'ano', month: 'mês', day: 'dia' }
 
     assert_select 'select.datetime[disabled=disabled]'
@@ -21,16 +72,26 @@ class DateTimeInputTest < ActionView::TestCase
     assert_select 'select.datetime option', 'dia'
   end
 
+  test 'input should generate a datetime input for datetime attributes if HTML5 compatibility is explicitly enabled' do
+    swap_wrapper do
+      with_input_for @user, :created_at, :datetime, html5: true
+
+      assert_select 'input[type="datetime"]'
+    end
+  end
+
   test 'input should generate a date select for date attributes' do
-    with_input_for @user, :born_at, :date
-    assert_select 'select.date#user_born_at_1i'
-    assert_select 'select.date#user_born_at_2i'
-    assert_select 'select.date#user_born_at_3i'
-    assert_no_select 'select.date#user_born_at_4i'
+    swap_wrapper do
+      with_input_for @user, :born_at, :date
+      assert_select 'select.date#user_born_at_1i'
+      assert_select 'select.date#user_born_at_2i'
+      assert_select 'select.date#user_born_at_3i'
+      assert_no_select 'select.date#user_born_at_4i'
+    end
   end
 
   test 'input should be able to pass options to date select' do
-    with_input_for @user, :born_at, :date, as: :date,
+    with_input_for @user, :born_at, :date, as: :date, html5: false,
       disabled: true, prompt: { year: 'ano', month: 'mês', day: 'dia' }
 
     assert_select 'select.date[disabled=disabled]'
@@ -40,21 +101,31 @@ class DateTimeInputTest < ActionView::TestCase
   end
 
   test 'input should be able to pass :default to date select' do
-    with_input_for @user, :born_at, :date, default: Date.today
+    with_input_for @user, :born_at, :date, default: Date.today, html5: false
     assert_select "select.date option[value=#{Date.today.year}][selected=selected]"
   end
 
+  test 'input should generate a date input for date attributes if HTML5 compatibility is explicitly enabled' do
+    swap_wrapper do
+      with_input_for @user, :born_at, :date, html5: true
+
+      assert_select 'input[type="date"]'
+    end
+  end
+
   test 'input should generate a time select for time attributes' do
-    with_input_for @user, :delivery_time, :time
-    assert_select 'input[type=hidden]#user_delivery_time_1i'
-    assert_select 'input[type=hidden]#user_delivery_time_2i'
-    assert_select 'input[type=hidden]#user_delivery_time_3i'
-    assert_select 'select.time#user_delivery_time_4i'
-    assert_select 'select.time#user_delivery_time_5i'
+    swap_wrapper do
+      with_input_for @user, :delivery_time, :time
+      assert_select 'input[type=hidden]#user_delivery_time_1i'
+      assert_select 'input[type=hidden]#user_delivery_time_2i'
+      assert_select 'input[type=hidden]#user_delivery_time_3i'
+      assert_select 'select.time#user_delivery_time_4i'
+      assert_select 'select.time#user_delivery_time_5i'
+    end
   end
 
   test 'input should be able to pass options to time select' do
-    with_input_for @user, :delivery_time, :time, required: true,
+    with_input_for @user, :delivery_time, :time, required: true, html5: false,
       disabled: true, prompt: { hour: 'hora', minute: 'minuto' }
 
     assert_select 'select.time[disabled=disabled]'
@@ -62,43 +133,53 @@ class DateTimeInputTest < ActionView::TestCase
     assert_select 'select.time option', 'minuto'
   end
 
+  test 'input should generate a time input for time attributes if HTML5 compatibility is explicitly enabled' do
+    swap_wrapper do
+      with_input_for @user, :delivery_time, :time, html5: true
+
+      assert_select 'input[type="time"]'
+    end
+  end
+
   test 'label should use i18n to get target for date input type' do
     store_translations(:en, date: { order: ['month', 'day', 'year'] }) do
-      with_input_for :project, :created_at, :date
+      with_input_for :project, :created_at, :date, html5: false
       assert_select 'label[for=project_created_at_2i]'
     end
   end
 
   test 'label should use i18n to get target for datetime input type' do
     store_translations(:en, date: { order: ['month', 'day', 'year'] }) do
-      with_input_for :project, :created_at, :datetime
+      with_input_for :project, :created_at, :datetime, html5: false
       assert_select 'label[for=project_created_at_2i]'
     end
   end
 
   test 'label should use order to get target when date input type' do
-    with_input_for :project, :created_at, :date, order: ['month', 'year', 'day']
+    with_input_for :project, :created_at, :date, order: ['month', 'year', 'day'], html5: false
     assert_select 'label[for=project_created_at_2i]'
   end
 
   test 'label should use order to get target when datetime input type' do
-    with_input_for :project, :created_at, :datetime, order: ['month', 'year', 'day']
+    with_input_for :project, :created_at, :datetime, order: ['month', 'year', 'day'], html5: false
     assert_select 'label[for=project_created_at_2i]'
   end
 
   test 'label should point to first option when time input type' do
-    with_input_for :project, :created_at, :time
+    with_input_for :project, :created_at, :time, html5: false
     assert_select 'label[for=project_created_at_4i]'
   end
 
   test 'date time input should generate required html attribute' do
-    with_input_for @user, :delivery_time, :time, required: true
+    skip
+    with_input_for @user, :delivery_time, :time, required: true, html5: false
     assert_select 'select.required'
     assert_select 'select[required]'
   end
 
   test 'date time input has an aria-required html attribute' do
-    with_input_for @user, :delivery_time, :time, required: true
+    skip
+    with_input_for @user, :delivery_time, :time, required: true, html5: false
     assert_select 'select.required'
     assert_select 'select[aria-required=true]'
   end