Little coverage output formatter

cover.rb

#!/usr/bin/env ruby

require 'pp'
require 'coverage'

Coverage.start

ARGV.each do |arg|
  require_relative arg
end

red, yellow, green = "\e[31m%s\e[0m", "\e[33m%s\e[0m", "\e[32m%s\e[0m"

Coverage.result.each do |file, results|
  puts "", file.center(80, " = "), ""

  lines = File.readlines(file)
  lines.zip(results) do |line, result|
    executed = result ||
      case line
      when /^\s*end\s*$/; true
      when /^\s*$/; true
      when /^\s*#/; true
      end

    if result
      print green % ["%3d | %s" % [result.to_i, line]]
    elsif executed
      print yellow % ["%3d | %s" % [result.to_i, line]]
    else
      print red % ["    | %s" % [line]]
    end
  end
end