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+;; A read-evaluate-print-loop for gpgscm.
+;;
+;; Copyright (C) 2016 g10 Code GmbH
+;;
+;; This file is part of GnuPG.
+;;
+;; GnuPG is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; GnuPG 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 General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program; if not, see <http://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))))