61 lines
1.7 KiB
Scheme
61 lines
1.7 KiB
Scheme
;;; This file is part of scsh.
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(define (return-from-vm n)
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(with-continuation (if #t #f) (lambda () n)))
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(define (startup user-context)
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(lambda (args)
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(start-new-session user-context
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(current-input-port)
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(current-output-port)
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(current-error-port)
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args
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#t) ;batch?
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(with-interaction-environment
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(user-environment)
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(lambda ()
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(return-from-vm 0)))))
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(define (s48-command command-string)
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(let* ((in (make-string-input-port command-string))
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(s-exp (read in)))
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(if (and (not (eof-object? s-exp))
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(eof-object? (read in)))
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(call-with-values
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(lambda ()
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(call-with-current-continuation
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(lambda (k)
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(with-handler
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(lambda (cond more)
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; (display "error is "(current-error-port))
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; (display cond (current-error-port))
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; (newline (current-error-port))
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(k cond))
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(lambda ()
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(eval s-exp (user-command-environment)))))))
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(lambda args
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(cond ((null? args)
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; (display "null as result"
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; (current-error-port)))
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((null? (cdr args))
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; (display "evaluated to:" (current-error-port))
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; (display (car args)(current-error-port))
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; (newline (current-error-port))
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(car args))
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(else
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(display "multiple return values in s48-command"
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(current-error-port))
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))))
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(display "s48-command got not exactly one s-exp"
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(current-error-port)))))
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;; TODO write a procedure to be called time by time to let the
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;; administrative threads run
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;; must be called from a running command processor
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(define (dump-libscsh-image filename)
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(dump-scsh-program (startup (user-context)) filename))
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(define-exported-binding "s48-command" s48-command)
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