Class: IRB::Debug::UI

Inherits:
DEBUGGER__::UI_Base
  • Object
show all
Defined in:
lib/irb/debug/ui.rb

Instance Method Summary collapse

Constructor Details

#initialize(irb) ⇒ UI

Returns a new instance of UI.



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# File 'lib/irb/debug/ui.rb', line 7

def initialize(irb)
  @irb = irb
end

Instance Method Details

#activate(session, on_fork: false) ⇒ Object 



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# File 'lib/irb/debug/ui.rb', line 15

def activate session, on_fork: false
end

#after_fork_parent ⇒ Object 



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# File 'lib/irb/debug/ui.rb', line 84

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) ⇒ Object 



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# File 'lib/irb/debug/ui.rb', line 34

def ask prompt
  setup_interrupt do
    print prompt
    ($stdin.gets || '').strip
  end
end

#deactivate ⇒ Object 



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# File 'lib/irb/debug/ui.rb', line 18

def deactivate
end

#puts(str = nil) ⇒ Object 



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# File 'lib/irb/debug/ui.rb', line 41

def puts str = nil
  case str
  when Array
    str.each{|line|
      $stdout.puts line.chomp
    }
  when String
    str.each_line{|line|
      $stdout.puts line.chomp
    }
  when nil
    $stdout.puts
  end
end

#quit(n) ⇒ Object 



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# File 'lib/irb/debug/ui.rb', line 29

def quit n
  yield
  exit n
end

#readline(_) ⇒ Object 



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# File 'lib/irb/debug/ui.rb', line 56

def readline _
  setup_interrupt do
    tc = DEBUGGER__::SESSION.instance_variable_get(:@tc)
    cmd = @irb.debug_readline(tc.current_frame.binding || TOPLEVEL_BINDING)

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

#remote? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/irb/debug/ui.rb', line 11

def remote?
  false
end

#setup_interrupt ⇒ Object 



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# File 'lib/irb/debug/ui.rb', line 70

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 ⇒ Object 



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# File 'lib/irb/debug/ui.rb', line 21

def width
  if (w = IO.console_size[1]) == 0 # for tests PTY
    80
  else
    w
  end
end