;; ,open let-opt
(define (wait-for-key . optionals)
  (let-optionals optionals
      ((tty-port (current-input-port)))
    (let* ((old (tty-info tty-port))
	   (copy (copy-tty-info old)))
      (set-tty-info:local-flags 
       copy
       (bitwise-and (tty-info:local-flags copy)
		    (bitwise-not ttyl/canonical)))
      (set-tty-info:min copy 1)
      (set-tty-info:time copy 0)
      (set-tty-info/now tty-port copy)
      (let ((c (read-char tty-port)))
	(set-tty-info/now tty-port old)
	c))))

(define (standard-command-plugin-completer command args)
  #f)

(define (show-shell-screen)
  (def-prog-mode)
  (endwin)
  (display "Press any key to return to scsh-nuit...")
  (wait-for-key))

(define (standard-command-plugin-evaluater command args)
  (def-prog-mode)
  (endwin)
  (let ((status (run (,command ,@args))))
    (display "Press any key to return to scsh-nuit...")
    (wait-for-key)
    status))

(define standard-command-plugin
  (make-command-plugin #f
		       standard-command-plugin-completer
		       standard-command-plugin-evaluater))

;; some common commands

(define no-completer (lambda args #f))

(register-plugin!
 (make-command-plugin "ls"
		      no-completer
 		      (lambda (command args)
 			(directory-files))))

(register-plugin!
 (make-command-plugin "ps"
		      no-completer
		      (lambda (command args)
			(pps))))

(register-plugin!
 (make-command-plugin "pwd"
		      no-completer
 		      (lambda (command args)
 			(cwd))))

(register-plugin!
 (make-command-plugin "cd"
		      no-completer
 		      (lambda (command args)
 			(chdir (resolve-file-name (if (null? args)
                                                      "~"
                                                      (car args))))
                        (cwd))))

(register-plugin!
 (make-command-plugin "setenv"
		      no-completer
 		      (lambda (command args)
 			(setenv (car args) (cadr args)))))

(register-plugin!
 (make-command-plugin "getenv"
		      no-completer
		      (lambda (command args)
			(getenv (car args)))))

(register-plugin!
 (make-command-plugin "printenv"
		      no-completer
 		      (lambda (command args)
 			(env->alist))))

(register-plugin!
 (make-command-plugin "exit"
                      no-completer
                      (lambda (command args)
                        (exit (if (null? args)
                                  0
                                  (string->number (car args)))))))