62 lines
2.3 KiB
Scheme
62 lines
2.3 KiB
Scheme
;;; -*-scheme-*-
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;;; GNU Mes --- Maxwell Equations of Software
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;;; Copyright © 2016,2017,2018,2019,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; This file is part of GNU Mes.
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;;;
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;;; GNU Mes is free software; you can redistribute it and/or modify it
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;;; 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 (at
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;;; your option) any later version.
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;;;
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;;; GNU Mes is distributed in the hope that it will be useful, but
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;;; 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(define (with-output-to-string thunk)
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(define save-write-byte write-byte)
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(let ((stdout '()))
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(set! write-byte
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(lambda (x . rest)
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(let ((out? (or (null? rest) (eq? (car rest) (current-output-port)))))
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(if (not out?) (apply save-write-byte (cons x rest))
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(begin
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(set! stdout (append stdout (list (integer->char x))))
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x)))))
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(thunk)
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(let ((r (apply string stdout)))
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(set! write-byte save-write-byte)
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r)))
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(define (simple-format destination format . rest)
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(let ((port (if (boolean? destination) (current-output-port) destination))
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(lst (string->list format)))
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(define (simple-format lst args)
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(if (pair? lst)
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(let ((c (car lst)))
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(if (not (eq? c #\~)) (begin (write-char (car lst) port)
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(simple-format (cdr lst) args))
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(let ((c (cadr lst)))
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(case c
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((#\A) (display (car args) port))
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((#\a) (display (car args) port))
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((#\S) (write (car args) port))
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((#\s) (write (car args) port))
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(else (display (car args) port)))
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(simple-format (cddr lst) (cdr args)))))))
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(if destination (simple-format lst rest)
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(with-output-to-string
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(lambda () (simple-format lst rest))))))
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(define format simple-format)
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