Get calling method name in Ruby

caller_method_name.rb

module CallerMethodName
  extend self
  def caller_method_name
    parse_caller(caller(2).first).last
  end

  def parse_caller(at)
    if /^(.+?):(\d+)(?::in `(.*)')?/ =~ at
      file = Regexp.last_match[1]
      line = Regexp.last_match[2].to_i
      method = Regexp.last_match[3]
      [file, line, method]
    end
  end

  # guessing from file name
  def caller_class_name
    File.basename(parse_caller(caller(2).first).first, '.rb').classify
  end
    
end

if __FILE__ == $PROGRAM_NAME
  require 'test/unit'
  require 'rubygems'
  require 'active_support/inflector'
  class TestCallerMethodName < Test::Unit::TestCase
    class A
      extend CallerMethodName
      def self.gief_method
        caller_method_name
      end
      def self.gief_class
        caller_class_name
      end
    end

    # should parse a stacktrace line
    def test_parse_caller
      stacktrace = "/opt/ruby-enterprise/lib/ruby/1.8/irb/workspace.rb:52:in `irb_binding'"
      assert_equal ['/opt/ruby-enterprise/lib/ruby/1.8/irb/workspace.rb', 52, 'irb_binding'], CallerMethodName.parse_caller(stacktrace)
    end

    def test_caller_class_name
      assert_equal 'CallerMethodName', A.gief_class
    end

    def test_caller_method_name
            
      assert_equal 'test_caller_method_name', A.gief_method
    end

  end
    
end