foss-mmo/modules/ice-9/control.scm

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;;; Copyright (C) 2010, 2011, 2013, 2024 Free Software Foundation, Inc.
;;;
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public
;;; License as published by the Free Software Foundation; either
;;; version 3 of the License, or (at your option) any later version.
;;;
;;; This library is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this library; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;; Commentary:
;;;
;;; This is a convenience module for porting Goblins to Hoot while Guile support
;;; is incomplete. It simply re-exports some extant Hoot prompt functionality
;;; and adds call-with-escape-continuation and call/ec.
;;;
;;; Code:
(define-module (ice-9 control)
#:export (make-prompt-tag
default-prompt-tag
call-with-prompt
abort-to-prompt
%
default-prompt-handler
call-with-escape-continuation
call/ec))
(define (call-with-escape-continuation proc)
"Call PROC with an escape continuation."
(let ((tag (list 'call/ec)))
(call-with-prompt tag
(lambda ()
(proc (lambda args
(apply abort-to-prompt tag args))))
(lambda (_ . args)
(apply values args)))))
(define call/ec call-with-escape-continuation)