86 lines
2.9 KiB
Scheme
86 lines
2.9 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 touch)
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#:use-module (ice-9 getopt-long)
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#:use-module (ice-9 match)
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#:use-module (ice-9 receive)
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#:use-module (ice-9 regex)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9 gnu)
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#:use-module (srfi srfi-26)
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#:use-module (gash config)
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#:use-module (gash guix-utils)
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#:use-module (gash shell-utils)
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#:export (
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touch
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))
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(define (create-or-touch file time)
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(let ((exists? (file-exists? file)))
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(when (not exists?) (with-output-to-file file (cut display "")))
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(cond (time (utime file time time))
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(exists? (let ((time (current-time)))
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(utime file time time))))))
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(define (parse-date string)
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(if (string-prefix? "@" string)
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(string->number (substring string 1))
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(error (format #f "touch: cannot parse date:~a\n" string))))
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(define (touch . args)
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(let* ((option-spec
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'((date (single-char #\d) (value #t))
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(help (single-char #\h))
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(reference (single-char #\r) (value #t))
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(version (single-char #\V))))
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(options (getopt-long args option-spec))
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(help? (option-ref options 'help #f))
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(version? (option-ref options 'version #f))
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(date (option-ref options 'date #f))
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(reference (option-ref options 'reference #f))
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(files (option-ref options '() '()))
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(usage? (and (not help?) (null? files))))
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(cond (version? (format #t "touch (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: touch [OPTION]... FILE...
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Update the access and modification times of each FILE to the current time.
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Options:
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-d, --date=DATE parse DATE and use it instead of current time
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--help display this help and exit
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-r, --reference=FILE use FILE's times instead of current time
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--version output version information and exit
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Each MODE is of the form '[ugoa]*([-+=]([rwxXst]*|[ugo]))+|[-+=][0-7]+'.
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")
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(exit (if usage? 2 0)))
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(else
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(let ((time (and=> date parse-date)))
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(for-each (cut create-or-touch <> time) files))))))
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(define main touch)
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