class IRB::Debug::UI - irb: Ruby Standard Library Documentation

# class IRB::Debug::UI

### Public Class Methods

new(irb) click to toggle source

    # File irb/debug/ui.rb, line 7
    def initialize(irb)
      @irb = irb
    end

### Public Instance Methods

activate(session, on_fork: false) click to toggle source

    # File irb/debug/ui.rb, line 15
    def activate session, on_fork: false
    end

after_fork_parent() click to toggle source

    # File irb/debug/ui.rb, line 82
    def after_fork_parent
      parent_pid = Process.pid

      at_exit{
        DEBUGGER__::SESSION.intercept_trap_sigint_end
        trap(:SIGINT, :IGNORE)

        if Process.pid == parent_pid
          # only check child process from its parent
          begin
            # wait for all child processes to keep terminal
            Process.waitpid
          rescue Errno::ESRCH, Errno::ECHILD
          end
        end
      }
    end

ask(prompt) click to toggle source

    # File irb/debug/ui.rb, line 34
    def ask prompt
      setup_interrupt do
        print prompt
        ($stdin.gets || '').strip
      end
    end

deactivate() click to toggle source

    # File irb/debug/ui.rb, line 18
    def deactivate
    end

puts(str = nil) click to toggle source

    # File irb/debug/ui.rb, line 41
    def puts str = nil
      case str
      when Array
        str.each{|line|
          $stdout.puts line.chomp
        }
      when String
        Pager.page_content(str, retain_content: true)
      when nil
        $stdout.puts
      end
    end

quit(n) { || ... } click to toggle source

    # File irb/debug/ui.rb, line 29
    def quit n
      yield
      exit n
    end

readline(_) click to toggle source

    # File irb/debug/ui.rb, line 54
    def readline _
      setup_interrupt do
        tc = DEBUGGER__::SESSION.instance_variable_get(:@tc)
        cmd = @irb.debug_readline(tc.current_frame.eval_binding || TOPLEVEL_BINDING)

        case cmd
        when nil # when user types C-d
          "continue"
        else
          cmd
        end
      end
    end

remote?() click to toggle source

    # File irb/debug/ui.rb, line 11
    def remote?
      false
    end

setup_interrupt() { || ... } click to toggle source

    # File irb/debug/ui.rb, line 68
    def setup_interrupt
      DEBUGGER__::SESSION.intercept_trap_sigint false do
        current_thread = Thread.current # should be session_server thread

        prev_handler = trap(:INT){
          current_thread.raise Interrupt
        }

        yield
      ensure
        trap(:INT, prev_handler)
      end
    end

width() click to toggle source

    # File irb/debug/ui.rb, line 21
    def width
      if (w = IO.console_size[1]) == 0 # for tests PTY
        80
      else
        w
      end
    end