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;; A read-evaluate-print-loop for gpgscm.
;; Copyright (C) 2016 g10 Code GmbH
;;
;; This file is part of Libgpg-error.
;;
;; Libgpg-error 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 2.1 of
;; the License, or (at your option) any later version.
;;
;; Libgpg-error 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 program; if not, see <https://www.gnu.org/licenses/>.
;; Interactive repl using 'prompt' function. P must be a function
;; that given the current entered prefix returns the prompt to
;; display.
(define (repl p environment)
(call/cc
(lambda (exit)
(let loop ((prefix ""))
(let ((line (prompt (p prefix))))
(if (and (not (eof-object? line)) (= 0 (string-length line)))
(exit (loop prefix)))
(if (not (eof-object? line))
(let* ((next (string-append prefix line))
(c (catch (begin (echo "Parse error:" *error*)
(loop prefix))
(read (open-input-string next)))))
(if (not (eof-object? c))
(begin
(catch (begin
(display (car *error*))
(when (and (cadr *error*)
(not (null? (cadr *error*))))
(display ": ")
(write (cadr *error*)))
(newline)
(vm-history-print (caddr *error*)))
(echo " ===>" (eval c environment)))
(exit (loop ""))))
(exit (loop next)))))))))
(define (prompt-append-prefix prompt prefix)
(string-append prompt (if (> (string-length prefix) 0)
(string-append prefix "...")
"> ")))
;; Default repl run by main.c.
(define (interactive-repl . environment)
(repl (lambda (p) (prompt-append-prefix "gpgscm " p))
(if (null? environment) (interaction-environment) (car environment))))
;; Ask a yes/no question.
(define (prompt-yes-no? question default)
(let ((answer (prompt (string-append question "? ["
(if default "Y/n" "y/N") "] "))))
(cond
((= 0 (string-length answer))
default)
((or (equal? "y" answer) (equal? "Y" answer))
#t)
(else
#f))))
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