41 lines
1.0 KiB
Scheme
41 lines
1.0 KiB
Scheme
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; Copyright (c) 1993, 1994 Richard Kelsey and Jonathan Rees. See file COPYING.
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(define-syntax require
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(syntax-rules (quote)
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((require '(name1 name2 ...))
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(*require '(name1 name2 ...)))))
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(define (*require interface-id)
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(let ((start-thunk
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(case (car interface-id)
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((scheme-48)
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(let ((p (config-package)))
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(lambda () p)))
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((scheme-library-1)
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(let* ((p (config-package))
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(thunk
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(lambda ()
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(environment-ref p 'scheme-library-1))))
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(ensure-loaded (thunk))
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(thunk)))
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(else
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(error "unrecognized interface identifier" interface-id)))))
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(package-open! (interaction-environment)
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(let loop ((names (cdr interface-id))
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(thunk start-thunk))
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(if (null? names)
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thunk
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(let ((new-thunk
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(lambda ()
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(let ((source (thunk)))
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(if (package? source)
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(environment-ref source
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(car names))
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(*structure-ref source
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(car names)))))))
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(ensure-loaded (new-thunk))
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(loop (cdr names)
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new-thunk)))))))
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