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)
  puts "#{error}\n#{error.backtrace}" if error
end

def help=(text)
  @help ||= text
  interface.puts("\n#{text}\n")
end

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

def interface
  @interface ||= LocalInterface.new
end

def prepare_options
  OptionParser.new(banner, 25) do |opts|
    opts.banner = banner
    OptionSetter.new(self, opts).setup
  end
end

def remote=(host_and_port)
  @remote ||= Byebug.parse_host_and_port(host_and_port)
end

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