class Gitlab::Shell

def completion
  proc { |str| actions.map(&:to_s).grep(/^#{Regexp.escape(str)}/) }
end

def execute(cmd = command, args = arguments)
  raise "Unknown command: #{cmd}. See the 'help' for a list of valid commands." unless actions.include?(cmd.to_sym)
  confirm_command(cmd)
  gitlab_helper(cmd, args)
end

def history
  @history ||= History.new
end

def parse_input(buffer)
  buf = Shellwords.shellwords(buffer)
  @command = buf.shift
  @arguments = buf.count.positive? ? buf : []
end

def quit_shell
  history.save
  exit
end

def setup
  history.load
  Readline.completion_proc = completion
  Readline.completion_append_character = ' '
end

def start
  trap('INT') { quit_shell } # capture ctrl-c
  setup
  while (buffer = Readline.readline('gitlab> '))
    begin
      parse_input buffer
      @arguments.map! { |arg| symbolize_keys(yaml_load(arg)) }
      case buffer
      when nil, ''
        next
      when 'exit'
        quit_shell
      when /^\bhelp\b+/
        puts help(arguments[0]) { |out| out.gsub!(/Gitlab\./, 'gitlab> ') }
      else
        history << buffer
        data = execute command, arguments
        output_table command, arguments, data
      end
    rescue StandardError => e
      puts e.message
    end
  end
  quit_shell # save history if user presses ctrl-d
end