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;; Tekuti
;; Copyright (C) 2008, 2010, 2012 Andy Wingo <wingo at pobox dot com>
;; 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, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 59 Temple Place - Suite 330 Fax: +1-617-542-2652
;; Boston, MA 02111-1307, USA gnu@gnu.org
;;; Commentary:
;;
;; Tags, tags, tags
;;
;;; Code:
(define-module (tekuti tags)
#:use-module (tekuti util)
#:use-module (web uri)
#:use-module (tekuti config)
#:use-module (tekuti post)
#:use-module (tekuti git)
#:use-module ((srfi srfi-1) #:select (filter))
#:export (tag-link
compute-related-posts compute-related-tags
reindex-tags))
(define (tag-link tagname)
`(a (@ (href ,(string-append
"/" (encode-and-join-uri-path
(append *public-path-base*
(cons "tags" tagname))))))
,tagname))
(define (compute-tags posts)
(let ((hash (make-hash-table)))
(for-each
(lambda (post)
(for-each
(lambda (cat)
(hash-push! hash cat (post-key post)))
(post-tags post)))
posts)
hash))
(define (compute-related-posts post index)
(let ((hash (assq-ref index 'tags)))
(if hash
(let ((accum (make-hash-table)))
(for-each
(lambda (tag)
(for-each
(lambda (key)
(if (not (equal? key (post-key post)))
(hash-push! accum key tag)))
(or (hash-ref hash tag) '())))
(post-tags post))
(dsu-sort (dsu-sort
(hash-fold
(lambda (key tags rest)
(acons (post-from-key index key) tags rest))
'() accum)
(lambda (x) (post-timestamp (car x)))
>)
length >))
'())))
(define (compute-related-tags tag index)
(let ((hash (assq-ref index 'tags)))
(if hash
(let ((accum (make-hash-table)))
(for-each
(lambda (key)
(for-each
(lambda (other-tag)
(if (not (equal? other-tag tag))
(hash-push! accum other-tag key)))
(post-tags (post-from-key index key))))
(or (hash-ref hash tag) '()))
(dsu-sort
(hash-fold
(lambda (tag keys rest)
(acons tag (length keys) rest))
'() accum)
car
string<?))
'())))
(define (reindex-tags old-index index)
(compute-tags (latest-posts index #:limit -1)))
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