force_file_collision?

# File railties/lib/rails_generator/commands.rb, line 99
          def force_file_collision?(destination, src, dst, file_options = {}, &block)
            $stdout.print "overwrite #{destination}? (enter \"h\" for help) [Ynaqdh] "
            case $stdin.gets.chomp
              when /\Ad\z/i
                Tempfile.open(File.basename(destination), File.dirname(dst)) do |temp|
                  temp.write render_file(src, file_options, &block)
                  temp.rewind
                  $stdout.puts `#{diff_cmd} "#{dst}" "#{temp.path}"`
                end
                puts "retrying"
                raise 'retry diff'
              when /\Aa\z/i
                $stdout.puts "forcing #{spec.name}"
                options[:collision] = :force
              when /\Aq\z/i
                $stdout.puts "aborting #{spec.name}"
                raise SystemExit
              when /\An\z/i then :skip
              when /\Ay\z/i then :force
              else
                $stdout.puts "Y - yes, overwrite\nn - no, do not overwrite\na - all, overwrite this and all others\nq - quit, abort\nd - diff, show the differences between the old and the new\nh - help, show this help\n"
                raise 'retry'
            end
          rescue
            retry
          end