scheme48/scheme/env/basic-command.scm

; Part of Scheme 48 1.9.  See file COPYING for notices and license.

; Authors: Richard Kelsey, Jonathan Rees


; run

(define-command-syntax 'run "<exp>" "evaluate an expression" '(expression))

(define (run exp)
  (evaluate-and-select exp (environment-for-commands)))

; exit-when-done

(define-command-syntax 'exit-when-done "[<status>]"
  "leave Scheme after all threads finish"
  '(&opt expression))

(define (exit-when-done . exp-option)
  (let ((status (if (null? exp-option)
                    0
                    (eval (car exp-option) (environment-for-commands)))))
    (terminate-command-processor! status)))

(define-command-syntax 'exit
		       "[<status>]"
		       "leave Scheme now"
		       '(&opt expression))

(define (exit . exp-option)
  (let ((status (if (null? exp-option)
                    0
                    (eval (car exp-option) (environment-for-commands)))))
    (scheme-exit-now status)))

; go

(define-command-syntax 'go "<exp>" "leave Scheme via tail recursion"
  '(expression))

(define (go exp)
  (let ((env (environment-for-commands)))
    (exit-command-processor (lambda () (eval exp env)))))

; load

(define-command-syntax 'load "<filename> ..."
  "load Scheme source file(s)"
  '(&rest filename))

(define (load . filenames)
  (apply really-load load-into filenames))

(define-command-syntax 'load-script "<filename> ..."
  "load Scheme script(s)"
  '(&rest filename))

(define (load-script . filenames)
  (apply really-load load-script-into filenames))

(define (really-load load-into . filenames)
  (let ((env (environment-for-commands)))
    ;; (with-interaction-environment env
    ;; (lambda ()
    ((if (load-noisily?)
	 (lambda (x) (x))
	 silently)
     (lambda ()
       (noting-undefined-variables env
	 (lambda ()
	   (for-each (lambda (filename)
		       (load-into filename env))
		     filenames)))))));; ))

; help

(define ? help)

(define-command-syntax 'help
  "[<command-name>]"
  "list all commands, or give help on a specific command"
  '(&opt name))

(define-command-syntax '? "[<command-name>]" "same as ,help" '(&opt name))