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a3cd2b988f
* readline.scm: New module. * boot-9.scm (repl-reader): New function. (scm-style-repl): Call repl-reader, instead of doing the reading ourselves. Remove repl-report-reset; it was never used for anything. (top-repl): If we've got the readline primitives, then redefine repl-reader to use them. If we've got the readline primitives, import the readline module.
72 lines
2.3 KiB
Scheme
72 lines
2.3 KiB
Scheme
;;;; readline.scm --- support functions for command-line editing
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;;;;
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;;;; Copyright (C) 1997 Free Software Foundation, Inc.
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;;;;
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;;;; This program 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 2, or (at your option)
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;;;; any later version.
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;;;;
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;;;; This program 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 software; see the file COPYING. If not, write to
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;;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;;;
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;;;; Contributed by Daniel Risacher <risacher@worldnet.att.net>.
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(define-module (ice-9 readline))
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(define prompt "")
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(define (make-readline-port)
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(let ((read-string "")
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(string-index -1))
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(letrec ((get-character
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(lambda ()
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(cond
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((eof-object? read-string)
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read-string)
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((>= string-index (string-length read-string))
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(begin
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(set! string-index -1)
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#\nl))
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((= string-index -1)
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(begin
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(set! read-string (readline prompt))
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(set! string-index 0)
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(if (not (eof-object? read-string))
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(begin
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(or (string=? read-string "")
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(add-history read-string))
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(get-character))
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read-string)))
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(else
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(let ((res (string-ref read-string string-index)))
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(set! string-index (+ 1 string-index))
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res))))))
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(make-soft-port
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(vector write-char display #f get-character #f)
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"rw"))))
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;;; We only create one readline port. There's no point in having
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;;; more, since they would all share the tty and history ---
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;;; everything except the prompt. And don't forget the
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;;; compile/load/run phase distinctions.
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(define the-readline-port #f)
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(define-public (readline-port)
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(if (not the-readline-port)
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(set! the-readline-port (make-readline-port)))
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the-readline-port)
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(define-public (set-readline-prompt! p)
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(set! prompt p))
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;(define myport (make-readline-port))
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;(define (doit)
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; (set-current-input-port myport))
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