prompt

# File lib/irb.rb, line 279
    def prompt(prompt, ltype, indent, line_no)
      p = prompt.dup
      p.gsub!(/%([0-9]+)?([a-zA-Z])/) do
        case $2
        when "N"
          @context.irb_name
        when "m"
          @context.main.to_s
        when "M"
          @context.main.inspect
        when "l"
          ltype
        when "i"
          if $1
            format("%" + $1 + "d", indent)
          else
            indent.to_s
          end
        when "n"
          if $1
            format("%" + $1 + "d", line_no)
          else
            line_no.to_s
          end
        when "%"
          "%"
        end
      end
      p
    end