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; Part of Scheme 48 1.9. See file COPYING for notices and license.
; Authors: Richard Kelsey, Jonathan Rees, Mike Sperber
; Miniature command processor.
(define (command-processor ignore args)
(let ((in (current-input-port))
(out (current-output-port))
(err (current-error-port))
(batch? (member "batch" (map os-string->string args))))
(let loop ()
((call-with-current-continuation
(lambda (go)
(with-handler
(lambda (c punt)
(cond ((or (serious-condition? c) (interrupt-condition? c))
(display-condition c err)
(go (if batch?
(lambda () 1)
loop)))
((warning? c)
(display-condition c err))
(else (punt))))
(lambda ()
(if (not batch?)
(display "- " out))
(let ((form (read in)))
(cond ((eof-object? form)
(newline out)
(go (lambda () 0)))
((and (pair? form) (eq? (car form) 'unquote))
(case (cadr form)
((load)
(mini-load in)
(go loop))
((go)
(let ((form (read in)))
(go (lambda ()
(eval form (interaction-environment))))))
(else (error 'command-processor
"unknown command" (cadr form) 'go 'load (eq? (cadr form) 'load)))))
(else
(call-with-values
(lambda () (eval form (interaction-environment)))
(lambda results
(for-each (lambda (result)
(write result out)
(newline out))
results)
(go loop))))))))))))))
(define (mini-load in)
(let ((c (peek-char in)))
(cond ((char=? c #\newline) (read-char in) #t)
((char-whitespace? c) (read-char in) (mini-load in))
((char=? c #\")
(let ((filename (read in)))
(load filename)
(mini-load in)))
(else
(let ((filename (read-string in char-whitespace?)))
(load filename)
(mini-load in))))))
(define (read-string port delimiter?)
(let loop ((l '()) (n 0))
(let ((c (peek-char port)))
(cond ((or (eof-object? c)
(delimiter? c))
(list->string (reverse l)))
(else
(loop (cons (read-char port) l) (+ n 1)))))))
(define (byte-vector->string b)
(let ((size (- (byte-vector-length b) 1)))
(do ((s (make-string size))
(i 0 (+ 1 i)))
((= i size)
s)
(string-set! s i (ascii->char (vector-ref b i))))))
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