break haunt.scm down into smaller (bandali *) modules

[~bandali/bndl.org] / bandali / utils.scm

;;; Copyright © 2019 Amin Bandali <bandali@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 (bandali utils)
  #:export (aa
            stylesheet
            intersperse))

(define* (aa content #:optional (uri content) . title)
  `(a (@ (href ,uri) (title ,(apply string-append title))) ,content))

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

(define (intersperse lst delim)
  "Return the elements of LST delimited by DELIM, such that the
resulting list is of an odd length and every second element is DELIM."
  (if (<= (length lst) 1)
      lst
      (cons* (car lst)
             delim
             (intersperse (cdr lst) delim))))