File: basic-command.scm

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; Copyright (c) 1993, 1994 Richard Kelsey and Jonathan Rees.  See file COPYING.


; run

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

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

; exit

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

(define (exit . exp-option)
  (let ((status (if (null? exp-option)
                    0
                    (evaluate (car exp-option) (environment-for-commands)))))
    (exit-command-processor (lambda () 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 () (evaluate exp env)))))

; load

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

(define (load . filenames)
  (let ((env (environment-for-commands)))
    ;; (with-interaction-environment env
      ;; (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))