class Byebug::Runner

def banner
  <<-EOB.gsub(/^ {8}/, '')
      byebug #{Byebug::VERSION}
      Usage: byebug [options] <script.rb> -- <script.rb parameters>
  EOB
end

def debug_program
  ok = syntax_valid?(File.read($PROGRAM_NAME))
  fail(InvalidScript, 'The script has incorrect syntax') unless ok
  error = Byebug.debug_load($PROGRAM_NAME, @stop)
  Byebug.puts "#{status}\n#{status.backtrace}" if error
end

def initialize(stop = true, quit = true)
  @stop = stop
  @quit = quit
end

def prepare_options
  OptionParser.new(banner, 25) do |opts|
    opts.banner = banner
    opts.on '-d', '--debug', 'Set $DEBUG=true' do
      $DEBUG = true
    end
    opts.on('-I', '--include list', 'Add to paths to $LOAD_PATH') do |list|
      $LOAD_PATH.push(list.split(':')).flatten!
    end
    opts.on '-m', '--[no-]post-mortem', 'Use post-mortem mode' do |v|
      Setting[:post_mortem] = v
    end
    opts.on '-q', '--[no-]quit', 'Quit when script finishes' do |v|
      @quit = v
    end
    opts.on '-x', '--[no-]rc', 'Run byebug initialization file' do |v|
      Byebug.run_init_script if v
    end
    opts.on '-s', '--[no-]stop', 'Stop when script is loaded' do |v|
      @stop = v
    end
    opts.on '-r', '--require file', 'Require library before script' do |lib|
      require lib
    end
    opts.on '-R', '--remote [host:]port', 'Remote debug [host:]port' do |p|
      self.remote = Byebug.parse_host_and_port(p)
    end
    opts.on '-t', '--[no-]trace', 'Turn on line tracing' do |v|
      Setting[:linetrace] = v
    end
    opts.on '-v', '--version', 'Print program version' do
      self.version = VERSION
    end
    opts.on('-h', '--help', 'Display this message') do
      self.help = opts.help
    end
  end
end

def run
  prepare_options.order!($ARGV)
  if version
    Byebug.puts("\n  Running byebug #{version}\n")
    return
  end
  if help
    Byebug.puts("#{help}\n")
    return
  end
  if remote
    Byebug.start_client(*remote)
    return
  end
  setup_cmd_line_args
  loop do
    debug_program
    break if @quit
    processor = Byebug::ControlCommandProcessor.new
    processor.process_commands
  end
end

def setup_cmd_line_args
  Byebug.mode = :standalone
  fail(NoScript, 'You must specify a program to debug...') if $ARGV.empty?
  program = which($ARGV.shift)
  program = which($ARGV.shift) if program == which('ruby')
  fail(NonExistentScript, "The script doesn't exist") unless program
  $PROGRAM_NAME = program
end

def which(cmd)
  return File.expand_path(cmd) if File.exist?(cmd)
  exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
  ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
    exts.each do |ext|
      exe = File.join(path, "#{cmd}#{ext}")
      return exe if File.executable?(exe) && !File.directory?(exe)
    end
  end
  nil
end