Create a RailsAdmin custom field

rails_admin_field_creator.rb

say "Create stub for '#{field_name = name.sub('rails_admin_', '')}' in gem '#{name}'. This may take a while"
run "rm -rf script/ config/ lib/tasks/"
run "rm -rf app/assets app/controllers app/helpers app/mailers app/models"
run "mkdir -p app/views/rails_admin/main"
inside "app/views/rails_admin/main" do
  create_file "_form_#{field_name}.html.haml", <<-END
  = form.send field.view_helper, field.method_name, field._html_attributes
  END
end

inside "lib" do
  append_file "#{name}.rb", <<-END

  require 'rails_admin/config/fields'
  require 'rails_admin/config/fields/base'

  module RailsAdmin
    module Config
      module Fields
        module Types
          class #{field_name.camelize} < RailsAdmin::Config::Fields::Base
            RailsAdmin::Config::Fields::Types::register(self)
          end
        end
      end
    end
  end

  RailsAdmin::Config::Fields.register_factory do |parent, properties, fields|
    if properties[:name] == :#{field_name}
      fields << RailsAdmin::Config::Fields::Types::#{field_name.camelize}.new(parent, properties[:name], properties)
      true
    else
      false
    end
  end

  END
end

say "RailsAdmin field stub generator is done"