mirror of git://git.gnupg.org/gnupg.git
70 lines
2.3 KiB
Scheme
70 lines
2.3 KiB
Scheme
;; A read-evaluate-print-loop for gpgscm.
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;;
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;; Copyright (C) 2016 g10 Code GmbH
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;;
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;; This file is part of GnuPG.
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;;
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;; GnuPG is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; GnuPG is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, see <http://www.gnu.org/licenses/>.
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;; Interactive repl using 'prompt' function. P must be a function
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;; that given the current entered prefix returns the prompt to
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;; display.
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(define (repl p environment)
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(call/cc
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(lambda (exit)
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(let loop ((prefix ""))
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(let ((line (prompt (p prefix))))
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(if (and (not (eof-object? line)) (= 0 (string-length line)))
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(exit (loop prefix)))
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(if (not (eof-object? line))
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(let* ((next (string-append prefix line))
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(c (catch (begin (echo "Parse error:" *error*)
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(loop prefix))
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(read (open-input-string next)))))
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(if (not (eof-object? c))
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(begin
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(catch (begin
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(display (car *error*))
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(when (and (cadr *error*)
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(not (null? (cadr *error*))))
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(display ": ")
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(write (cadr *error*)))
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(newline)
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(vm-history-print (caddr *error*)))
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(echo " ===>" (eval c environment)))
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(exit (loop ""))))
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(exit (loop next)))))))))
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(define (prompt-append-prefix prompt prefix)
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(string-append prompt (if (> (string-length prefix) 0)
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(string-append prefix "...")
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"> ")))
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;; Default repl run by main.c.
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(define (interactive-repl . environment)
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(repl (lambda (p) (prompt-append-prefix "gpgscm " p))
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(if (null? environment) (interaction-environment) (car environment))))
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;; Ask a yes/no question.
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(define (prompt-yes-no? question default)
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(let ((answer (prompt (string-append question "? ["
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(if default "Y/n" "y/N") "] "))))
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(cond
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((= 0 (string-length answer))
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default)
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((or (equal? "y" answer) (equal? "Y" answer))
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#t)
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(else
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#f))))
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