display_tasks_and_comments

# File lib/rake/application.rb, line 248
    def display_tasks_and_comments
      displayable_tasks = tasks.select { |t|
        (options.show_all_tasks || t.comment) &&
          t.name =~ options.show_task_pattern
      }
      case options.show_tasks
      when :tasks
        width = displayable_tasks.map { |t| t.name_with_args.length }.max || 10
        if truncate_output?
          max_column = terminal_width - name.size - width - 7
        else
          max_column = nil
        end

        displayable_tasks.each do |t|
          printf("#{name} %-#{width}s  # %s\n",
            t.name_with_args,
            max_column ? truncate(t.comment, max_column) : t.comment)
        end
      when :describe
        displayable_tasks.each do |t|
          puts "#{name} #{t.name_with_args}"
          comment = t.full_comment || ""
          comment.split("\n").each do |line|
            puts "    #{line}"
          end
          puts
        end
      when :lines
        displayable_tasks.each do |t|
          t.locations.each do |loc|
            printf "#{name} %-30s %s\n", t.name_with_args, loc
          end
        end
      else
        fail "Unknown show task mode: '#{options.show_tasks}'"
      end
    end