Simple Form Bootstrap 3 input group WIP

config-initializers-simple_form-after.rb

module SimpleForm
  module Components
    module After
      def after
        @after ||= begin
          options[:after].to_s.html_safe if options[:after].present?
        end
      end

      def has_after?
        after.present?
      end
    end
  end
end

SimpleForm::Inputs::Base.send(:include, SimpleForm::Components::After)

config-initializers-simple_form-before.rb

module SimpleForm
  module Components
    module Before
      def before
        @before ||= begin
          options[:before].to_s.html_safe if options[:before].present?
        end
      end

      def has_before?
        before.present?
      end
    end
  end
end

SimpleForm::Inputs::Base.send(:include, SimpleForm::Components::Before)

config-initializers-simple_form.rb

SimpleForm.setup do |config|
  # your code here

  config.wrappers :bootstrap3, tag: "div", error_class: "has-error" do |b|
    b.use :html5
    b.use :min_max
    b.use :maxlength
    b.use :placeholder

    b.optional :pattern
    b.optional :readonly

    b.use :input
    b.use :hint,  wrap_with: { tag: "span", class: "help-block" }
    b.use :error, wrap_with: { tag: "span", class: "help-block has-error" }
  end

  config.wrappers :input_group, tag: "div", error_class: "has-error" do |b|
    b.use :html5
    b.wrapper tag: :div, class: "input-group" do |ba|
      ba.optional :before, wrap_with: { tag: :div, class: "input-group-addon" }
      ba.use :input
      ba.optional :after, wrap_with: { tag: :div, class: "input-group-addon" }
    end
    b.use :hint,  wrap_with: { tag: "span", class: "help-block" }
    b.use :error, wrap_with: { tag: "span", class: "help-block has-error" }
  end
end