step_usage.rb

require 'cucumber/step_definition_light'

class StepUsage
  class StepDefKey < Cucumber::StepDefinitionLight
  end

  def initialize(step_mother, io, options)
    @step_mother = step_mother
    @io = io
    @stepdef_to_match = Hash.new{|h,stepdef_key| h[stepdef_key] = []}
  end

  def before_step(step)
    @step = step
  end

  def after_step_result(keyword, step_match, multiline_arg, status, exception, source_indent, background)
    if step_match.name.nil? # nil if it's from a scenario outline
      stepdef_key = StepDefKey.new(step_match.step_definition.regexp_source, step_match.step_definition.file_colon_line)
      @stepdef_to_match[stepdef_key] << {
        :keyword => keyword, 
        :step_match => step_match, 
        :status => status, 
        :file_colon_line => @step.file_colon_line
      }
      @step_mother.unmatched_step_definitions.each do |step_definition|
        stepdef_key = StepDefKey.new(step_definition.regexp_source, step_definition.file_colon_line)
        @stepdef_to_match[stepdef_key] = []
      end

      @keys = @stepdef_to_match.keys.sort { |a,b| a.file_colon_line <=> b.file_colon_line }
    end
  end
  
  def after_features(features)
    print_summary
  end

  private
  def print_summary
    last_step_file = @keys.first.file_colon_line.gsub(/:\d+$/, "")
    @io.puts last_step_file
    @keys.each do |stepdef_key|
      this_step_file = stepdef_key.file_colon_line.gsub(/:\d+$/, "")
      if last_step_file != this_step_file
        @io.puts
        @io.puts this_step_file
      end

      last_step_file = this_step_file
      @io.puts "  #{stepdef_key.regexp_source} # #{stepdef_key.file_colon_line}"
      @stepdef_to_match[stepdef_key].collect { |step| step[:file_colon_line] }.uniq.each { |file_colon_line| @io.puts "    #{file_colon_line}" }
    end
  end
end