module SpreeAutosuggest
  module Generators
    class InstallGenerator < Rails::Generators::Base

      def add_javascripts
        append_file "vendor/assets/javascripts/spree/frontend/all.js", "//= require store/spree_autosuggest\n"
      end

      def add_migrations
        run 'bundle exec rake railties:install:migrations FROM=spree_autosuggest'
      end

      def run_migrations
         res = ask "Would you like to run the migrations now? [Y/n]"
         if res == "" || res.downcase == "y"
           run 'bundle exec rake db:migrate'
         else
           puts "Skiping rake db:migrate, don't forget to run it!"
         end
      end
    end
  end
end

module SpreeAutosuggest
  module Generators
    class InstallGenerator < Rails::Generators::Base

      def add_javascripts
        append_file "vendor/assets/javascripts/spree/frontend/all.js",
          "//= require jquery-ui/autocomplete\n//= require frontend/spree_autosuggest\n"
      end

      def add_stylesheets
        inject_into_file 'vendor/assets/stylesheets/spree/frontend/all.css', " *= require jquery-ui/autocomplete\n", before: /\*\//, verbose: true
      end

      def add_migrations
        run 'bundle exec rake railties:install:migrations FROM=spree_autosuggest'
      end

      def run_migrations
         res = ask "Would you like to run the migrations now? [Y/n]"
         if res == "" || res.downcase == "y"
           run 'bundle exec rake db:migrate'
         else
           puts "Skiping rake db:migrate, don't forget to run it!"
         end
      end
    end
  end
end

Add jquery UI autocomplete files in install generator
Add jquery UI autocomplete files in install generator