class RSpec::Core::Parser

def self.parse!(args)
  new.parse!(args)
end

def parse!(args)
  return {} if args.empty?
  if args.include?("--formatter")
    RSpec.deprecate("the --formatter option", "-f or --format")
    args[args.index("--formatter")] = "--format"
  end
  options = {}
  parser(options).parse!(args)
  options
end

def parser(options)
  OptionParser.new do |parser|
    parser.banner = "Usage: rspec [options] [files or directories]\n\n"
    parser.on('-b', '--backtrace', 'Enable full backtrace') do |o|
      options[:full_backtrace] = true
    end
    parser.on('-c', '--[no-]color', '--[no-]colour', 'Enable color in the output') do |o|
      options[:color_enabled] = o
    end
    parser.on('-d', '--debugger', 'Enable debugging') do |o|
      options[:debug] = true
    end
    parser.on('-e', '--example STRING', "Run examples whose full nested names include STRING") do |o|
      options[:full_description] = Regexp.compile(Regexp.escape(o))
    end
    parser.on('-f', '--format FORMATTER', 'Choose a formatter',
            '  [p]rogress (default - dots)',
            '  [d]ocumentation (group and example names)',
            '  [h]tml',
            '  [t]extmate',
            '  custom formatter class name') do |o|
      options[:formatters] ||= []
      options[:formatters] << [o]
    end
    parser.on('-o', '--out FILE',
              'Write output to a file instead of STDOUT. This option applies',
              'to the previously specified --format, or the default format if',
              'no format is specified.'
             ) do |o|
      options[:formatters] ||= [['progress']]
      options[:formatters].last << o
    end
    parser.on_tail('-h', '--help', "You're looking at it.") do
      puts parser
      exit
    end
    parser.on('-I DIRECTORY', 'specify $LOAD_PATH directory (may be used more than once)') do |dir|
      options[:libs] ||= []
      options[:libs] << dir
    end
    parser.on('-l', '--line_number LINE', 'Specify the line number of a single example to run') do |o|
      options[:line_number] = o
    end
    parser.on('-O', '--options PATH', 'Specify the path to an options file') do |path|
      options[:custom_options_file] = path
    end
    parser.on('-p', '--profile', 'Enable profiling of examples with output of the top 10 slowest examples') do |o|
      options[:profile_examples] = o
    end
    parser.on('-P', '--pattern PATTERN', 'Load files those matching this pattern. Default is "spec/**/*_spec.rb"') do |o|
      options[:pattern] = o
    end
    parser.on('-r', '--require PATH', 'Require a file') do |path|
      options[:requires] ||= []
      options[:requires] << path
    end
    parser.on('-v', '--version', 'Show version') do
      puts RSpec::Core::Version::STRING
      exit
    end
    parser.on('-X', '--drb', 'Run examples via DRb') do |o|
      options[:drb] = true
    end
    parser.on('--configure COMMAND', 'Generate configuration files') do |cmd|
      CommandLineConfiguration.new(cmd).run
      exit
    end
    parser.on('--drb-port [PORT]', 'Port to connect to on the DRb server') do |o|
      options[:drb_port] = o.to_i
    end
    parser.on('--fail-fast', 'Abort the run on first failure.') do |o|
      options[:fail_fast] = true
    end
    parser.on('-t', '--tag TAG[:VALUE]', 'Run examples with the specified tag',
            'To exclude examples, add ~ before the tag (e.g. ~slow)',
            '(TAG is always converted to a symbol)') do |tag|
      filter_type = tag =~ /^~/ ? :exclusion_filter : :filter
      name,value = tag.gsub(/^(~@|~|@)/, '').split(':')
      name = name.to_sym
      value = true if value.nil?
      options[filter_type] ||= {}
      options[filter_type][name] = value
    end
    parser.on('--tty', 'Used internally by rspec when sending commands to other processes') do |o|
      options[:tty] = true
    end
  end
end