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4b11ed9d AB |
1 | ;;; Copyright © 2019 Amin Bandali <bandali@gnu.org> |
2 | ;;; | |
3 | ;;; This program is free software; you can redistribute it and/or | |
4 | ;;; modify it under the terms of the GNU General Public License as | |
5 | ;;; published by the Free Software Foundation; either version 3 of the | |
6 | ;;; License, or (at your option) any later version. | |
7 | ;;; | |
8 | ;;; This program is distributed in the hope that it will be useful, | |
9 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | ;;; General Public License for more details. | |
12 | ;;; | |
13 | ;;; You should have received a copy of the GNU General Public License | |
14 | ;;; along with this program. If not, see | |
15 | ;;; <http://www.gnu.org/licenses/>. | |
16 | ||
17 | (define-module (bandali tags) | |
18 | #:use-module (bandali prefs) ; my-* | |
19 | #:use-module (bandali theme) ; bandali-theme | |
20 | #:use-module (bandali utils) ; aa | |
21 | #:use-module (haunt builder blog) ; theme-collection-template | |
22 | #:use-module (haunt html) ; sxml->html | |
23 | #:use-module (haunt page) ; make-page | |
24 | #:use-module (haunt post) | |
25 | #:use-module (ice-9 match) ; match-lambda | |
26 | #:export (tag-uri | |
27 | tag-pages | |
28 | tag-links)) | |
29 | ||
30 | (define* (tag-uri prefix tag #:optional (ext ".html")) | |
31 | "Return a URI relative to the site's root for a page listing entries | |
32 | in PREFIX that are tagged with TAG." | |
33 | (string-append "/" prefix "/" tag ext)) | |
34 | ||
35 | (define* (tag-pages #:key | |
36 | (theme bandali-theme) | |
37 | (prefix "") | |
38 | (filter posts/reverse-chronological)) | |
39 | "Return a builder procedure that renders a list page for every tag | |
40 | used in a post. All arguments are optional: | |
41 | ||
42 | PREFIX: The directory in which to write the posts | |
43 | FILTER: The procedure called to manipulate the posts list before rendering" | |
44 | (lambda (site posts) | |
45 | (define (tag-list tag posts all-posts) | |
46 | (define (render-list title posts prefix) | |
47 | (let ((body ((theme-collection-template theme) | |
48 | site title posts prefix all-posts tag))) | |
49 | ((theme-layout theme) site title body))) | |
50 | (make-page (tag-uri my-tag-prefix tag) | |
51 | (render-list (string-append "Notes tagged ‘" tag "’") | |
52 | (filter posts) | |
53 | prefix) | |
54 | sxml->html)) | |
55 | (let ((tag-groups (posts/group-by-tag posts))) | |
56 | (map (match-lambda | |
57 | ((tag . tagged-posts) (tag-list tag tagged-posts posts))) | |
58 | tag-groups)))) | |
59 | ||
60 | (define (tag-links posts) | |
61 | "Generate an alphabetically sorted list of links to tagged posts. | |
62 | The link text consists of the tag name and the number of tagged posts | |
63 | in parentheses." | |
64 | `(ul (@ (class "tag-list")) | |
65 | ,(map (match-lambda | |
66 | ((tag . posts) | |
67 | `(li | |
68 | ,(aa (string-append tag | |
69 | " (" | |
70 | (number->string (length posts)) | |
71 | ")") | |
72 | (tag-uri my-tag-prefix tag))))) | |
73 | ;; sort by tag | |
74 | (sort (posts/group-by-tag posts) | |
75 | (lambda (a b) (string<? (car a) (car b))))))) |