awesome print public methods in irb

object-pm.rb

# Easily print methods local to an object's class
class Object
  ANSI_BOLD  = "\033[1m"
  ANSI_RESET = "\033[0m"
  ANSI_LGRAY = "\033[0;37m"
  ANSI_GRAY  = "\033[1;30m"

  def local_methods
    (methods - Object.instance_methods).sort
  end

  # Print object's methods
  def pm(*options)
    methods  = self.methods
    methods -= Object.methods unless options.include? :more
    filter   = options.select{ |opt| opt.kind_of? Regexp }.first
    methods  = methods.select{ |name| name =~ filter } if filter

    data     = methods.sort.collect do |name|
      method = self.method(name)
      if method.arity == 0
        args = "()"
      elsif method.arity > 0
        n    = method.arity
        args = "(#{(1..n).collect{ |i| "arg#{i}"}.join(", ") })"
      elsif method.arity < 0
        n    = -method.arity
        args = "(#{(1..n).collect{ |i| "arg#{i}"}.join(", ") }, ...)"
      end
      klass  = $1 if method.inspect =~ /Method: (.*?)#/
      [name, args, klass]
    end
    max_name = data.collect{ |item| item[0].size }.max
    max_args = data.collect{ |item| item[1].size }.max
    data.each do |item| 
      print " #{ANSI_BOLD}#{item[0].to_s.rjust(max_name)}#{ANSI_RESET}"
      print "#{ANSI_GRAY}#{item[1].to_s.ljust(max_args)}#{ANSI_RESET}"
      print "   #{ANSI_LGRAY}#{item[2]}#{ANSI_RESET}\n"
    end
    data.size
  end
end

stick this in your ~/.irbrc file