simple_form bootstrap 2 and bootstrap 3

gistfile1.txt

# Use this setup block to configure all options available in SimpleForm.
inputs = %w[
  CollectionSelectInput
  DateTimeInput
  FileInput
  GroupedCollectionSelectInput
  NumericInput
  PasswordInput
  RangeInput
  StringInput
  TextInput
]

inputs.each do |input_type|
  superclass = "SimpleForm::Inputs::#{input_type}".constantize

  new_class = Class.new(superclass) do
    def input_html_classes
      super.push('form-control')
    end
  end

  Object.const_set(input_type, new_class)
end

SimpleForm.setup do |config|
  config.wrappers :bootstrap, :tag => 'div', :class => 'control-group form-group', :error_class => 'error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label
    b.wrapper :tag => 'div', :class => 'controls' do |ba|
      ba.use :input
      ba.use :error, :wrap_with => { :tag => 'span', :class => 'help-inline' }
      ba.use :hint,  :wrap_with => { :tag => 'p', :class => 'help-block' }
    end
  end

  config.wrappers :prepend, :tag => 'div', :class => "control-group form-group", :error_class => 'error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label
    b.wrapper :tag => 'div', :class => 'controls' do |input|
      input.wrapper :tag => 'div', :class => 'input-prepend form-control' do |prepend|
        prepend.use :input
      end
      input.use :hint,  :wrap_with => { :tag => 'span', :class => 'help-block' }
      input.use :error, :wrap_with => { :tag => 'span', :class => 'help-inline' }
    end
  end

  config.wrappers :append, :tag => 'div', :class => "control-group form-group", :error_class => 'error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label
    b.wrapper :tag => 'div', :class => 'controls' do |input|
      input.wrapper :tag => 'div', :class => 'input-append form-control' do |append|
        append.use :input
      end
      input.use :hint,  :wrap_with => { :tag => 'span', :class => 'help-block' }
      input.use :error, :wrap_with => { :tag => 'span', :class => 'help-inline' }
    end
  end

  config.wrappers :small do |b|
    b.use :html5
    b.use :placeholder
    b.use :input
    b.use :error, :wrap_with => { :tag => 'span', :class => 'help-inline' }
  end

  # Wrappers for forms and inputs using the Twitter Bootstrap toolkit.
  # Check the Bootstrap docs (http://twitter.github.com/bootstrap)
  # to learn about the different styles for forms and inputs,
  # buttons and other elements.
  config.default_wrapper = :bootstrap
end