;;; Copyright © 2018-2021 David Thompson <davet@gnu.org>
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program.  If not, see
;;; <http://www.gnu.org/licenses/>.

(define-module (utils)
  #:use-module (ice-9 rdelim)
  #:use-module (srfi srfi-19)
  #:export (date
            stylesheet
            anchor
            link
            centered-image
            raw-snippet)
  #:replace (link))

(define (date year month day)
  "Create a SRFI-19 date for the given YEAR, MONTH, DAY"
  (let ((tzoffset (tm:gmtoff (localtime (time-second (current-time))))))
    (make-date 0 0 0 0 day month year tzoffset)))

(define (stylesheet name)
  `(link (@ (rel "stylesheet")
            (href ,(string-append "/css/" name ".css")))))

(define* (anchor content #:optional (uri content))
  `(a (@ (href ,uri)) ,content))

(define (link name uri)
  `(a (@ (href ,uri)) ,name))

(define* (centered-image url #:optional alt)
  `(img (@ (class "centered-image")
           (src ,url)
           ,@(if alt
                 `((alt ,alt))
                 '()))))

(define (raw-snippet code)
  `(pre (code ,(if (string? code) code (read-string code)))))