76 lines
2.7 KiB
Scheme
76 lines
2.7 KiB
Scheme
;;; Gash -- Guile As SHell
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;;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; This file is part of Gash.
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;;;
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;;; Gash 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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;;; Gash is distributed in the hope that it will be useful, but WITHOUT ANY
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;;; WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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;;; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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;;; 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 Gash. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(define-module (gash commands tr)
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#:use-module (ice-9 getopt-long)
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#:use-module (ice-9 rdelim)
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#:use-module (gash config)
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#:export (
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tr
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))
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(define (string-replace-string string from to)
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(cond ((string-contains string from)
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=>
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(lambda (i)
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(string-replace string to i (+ i (string-length from)))))
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(else string)))
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(define (tr . args)
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(let* ((option-spec
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'((delete (single-char #\d))
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(help (single-char #\h))
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(version (single-char #\V))))
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(options (getopt-long args option-spec))
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(delete? (option-ref options 'delete #f))
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(files (option-ref options '() '()))
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(help? (option-ref options 'help #f))
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(version? (option-ref options 'version #f))
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(usage? (and (not help?) (not (or (and delete? (= (length files) 1))
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(= (length files) 2))))))
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(cond (version? (format #t "tr (GASH) ~a\n" %version) (exit 0))
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((or help? usage?) (format (if usage? (current-error-port) #t)
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"\
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Usage: tr [OPTION]... SET1 [SET2]
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Options:
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-d, --delete delete characters in SET1, do not translate
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-h, --help display this help and exit
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-V, --version display version information and exit
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")
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(exit (if usage? 2 0)))
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(delete?
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(let* ((s (car files))
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(s (string-replace-string s "\\n" "\n"))
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(s (string-replace-string s "\\r" "\r"))
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(s (string-replace-string s "\\t" "\t"))
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(s (string->char-set s)))
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(let loop ((line (read-line (current-input-port) 'concat)))
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(if (eof-object? line) #t
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(begin
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(display (string-delete s line))
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(loop (read-line (current-input-port) 'concat)))))))
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(else
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(format #t "TODO: TR A B\n")))))
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(define main tr)
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