(define-structure tty-utils
  (export modify-tty echo-off echo-on raw raw-initialize)
  (open scsh let-opt scheme)
  (files tty-utils))

(define-structure expect-syntax-support
  (export expand-expect)
  (open scheme structure-refs
	receiving) ; for making alien containers.
  (access signals) ; for ERROR
  (files expect-syntax))

(define-structure expect
  (export task? make-task
	  task:process
	  task:in
	  task:out
	  task:buf set-task:buf!
	  task:pre-match set-task:pre-match!

	  port->monitor

	  user-task file->task ports->task close-task
	  wait-task close-task
	  spawn* (spawn :syntax)
	  tsend tsend-line
	  (expect :syntax)
	  (interact :syntax))
  (for-syntax (open expect-syntax-support scheme))

  (open scsh formats structure-refs
	receiving srfi-9 scheme srfi-13)
  (access signals) ; for ERROR

  (files expect interact))

(define-structure chat
  (export chat-abort chat-timeout chat-monitor
	  port->chat-logger file->chat-logger
	  (look-for 	      :syntax)
	  (chat 	      :syntax)
	  send send/cr)

  (open scsh expect fluids scheme)

  (files chat))

(define-structure printf-package
  (export printf sprintf display/cr display/nl)
  (open scsh formats scheme)

  (begin

    (define (printf  fmt . args) (apply format (current-output-port) fmt args))
    (define (sprintf fmt . args) (apply format #f fmt args))

    (define (display/cr str . maybe-port)
      (apply display str maybe-port)
      (apply write-string "\r" maybe-port))
    
    (define (display/nl str . maybe-port)
      (apply display str maybe-port)
      (apply write-string "\n" maybe-port))
    ))