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;;; Haunt --- Static site generator for GNU Guile
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;;
;;; 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:
;;
;; Post data type.
;;
;;; Code:
(define-module (haunt post)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-19)
#:use-module (haunt utils)
#:export (make-post
post?
post-file-name
post-sxml
post-metadata
post-ref
post-slug
posts/reverse-chronological
register-metdata-parser!
parse-metadata))
(define-record-type <post>
(make-post file-name metadata sxml)
post?
(file-name post-file-name)
(metadata post-metadata)
(sxml post-sxml))
(define (post-ref post key)
"Return the metadata corresponding to KEY within POST."
(assq-ref (post-metadata post) key))
(define (post-slug post)
"Transform the title of POST into a URL slug."
(string-join (map (lambda (s)
(string-filter char-set:letter+digit s))
(string-split (string-downcase (post-ref post 'title))
char-set:whitespace))
"-"))
(define (post->time post)
(date->time-utc (post-ref post 'date)))
(define (posts/reverse-chronological posts)
"Returns POSTS sorted in reverse chronological order."
(sort posts
(lambda (a b)
(time>? (post->time a) (post->time b)))))
;;;
;;; Metadata
;;;
(define %metadata-parsers
(make-hash-table))
(define (metadata-parser key)
(or (hash-ref %metadata-parsers key) identity))
(define (register-metadata-parser! name parser)
(hash-set! %metadata-parsers name parser))
(define (parse-metadata key value)
((metadata-parser key) value))
(register-metadata-parser!
'tags
(lambda (str)
(map string-trim-both (string-split str #\,))))
(register-metadata-parser! 'date string->date*)
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