force_file_collision?

# File railties/lib/rails_generator/commands.rb, line 95
          def force_file_collision?(destination, src, dst, file_options = {}, &block)
            $stdout.print "overwrite #{destination}? [Ynaqd] "
            case $stdin.gets
              when /d/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 /a/i
                $stdout.puts "forcing #{spec.name}"
                options[:collision] = :force
              when /q/i
                $stdout.puts "aborting #{spec.name}"
                raise SystemExit
              when /n/i then :skip
              else :force
            end
          rescue
            retry
          end