;;; Haunt --- Static site generator for GNU Guile
;;; Copyright © 2016 Erik Edrosa <erik.edrosa@gmail.com>
;;;
;;; This file is part of Haunt.
;;;
;;; Haunt 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.
;;;
;;; Haunt 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 Haunt.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:
;;
;; CommonMark post reader.
;;
;;; Code:

(define-module (website readers wordpress-markdown)
  #:use-module (commonmark)
  #:use-module (haunt post)
  #:use-module (haunt reader)
  #:use-module (haunt utils)
  #:use-module (ice-9 match)
  #:use-module (ice-9 rdelim)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-19)
  #:export (wordpress-markdown-reader))

(fluid-set! %default-port-encoding "UTF-8")

(define (string->custom-date* str)
  "Convert STR, a string in ISO 8601 format or the default format, into a
SRFI-19 date object."
  (or (catch 'misc-error
             (lambda _ (string->date str "~Y-~m-~dT~H:~M:~S~z"))
             (const #f))
      (catch 'misc-error
             (lambda _ (string->date str "~Y~m~d ~H:~M"))
             (const #f))))

(define (string->string* str) str)
(register-metadata-parser! 'date string->custom-date*)
(register-metadata-parser! 'authors string->string*)
(register-metadata-parser! 'license string->string*)

(define wordpress-markdown-reader
  (make-reader (make-file-extension-matcher "md")
               (lambda (file)
                 (call-with-input-file file
                   (lambda (port)
                     (values (read-metadata-headers port)
                             (commonmark->sxml port)))))))