define get-wordpress-article-url
;; Copyright (C) 2023-2024 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.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 <https://www.gnu.org/licenses/>.

;; Input: wordpress/articles/2015_07_replicant-source-code-hosting-and-rmll-2015.html
;; Output: https://blog.replicant.us/2015/07/replicant-source-code-hosting-and-rmll-2015/
(use-modules (ice-9 regex))

;; Input: wordpress/articles/2015_07_replicant-source-code-hosting-and-rmll-2015.html
;; Output: 2015_07_replicant-source-code-hosting-and-rmll-2015.html
(define (local-filename name)
  (list-ref (string-split name #\/) 2))

;; Output: 2015
(define year
  (car (string-split (local-filename "$@") #\_)))

;; Output: 07
(define month
  (cadr (string-split (local-filename "$@") #\_)))

;; Output: replicant-source-code-hosting-and-rmll-2015.html
(define html-page
  (regexp-substitute
   #f
   (string-match
    "[0-9]{4}_[0-9]{2}_"
    "$@")
   'post))

;; Output: replicant-source-code-hosting-and-rmll-2015
(define page-path
  (regexp-substitute
   #f
   (string-match
    ".html"
    html-page)
   'pre))

(string-append "https://blog.replicant.us/" year "/" month "/" page-path "/")
endef