1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
;;; Haunt --- Static site generator for GNU Guile
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;; Copyright © 2016 Christopher Allan Webber <cwebber@dustycloud.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:
;;
;; Atom feed builder.
;;
;;; Code:
(define-module (haunt builder atom)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:use-module (sxml simple)
#:use-module (haunt site)
#:use-module (haunt post)
#:use-module (haunt page)
#:use-module (haunt utils)
#:use-module (haunt html)
#:export (atom-feed
atom-feeds-by-tag))
(define (sxml->xml* sxml port)
"Write SXML to PORT, preceded by an <?xml> tag."
(display "<?xml version=\"1.0\" encoding=\"utf-8\"?>" port)
(sxml->xml sxml port))
(define (date->string* date)
"Convert date to ISO-8601 formatted string."
(date->string date "~4"))
(define* (post->atom-entry site post #:key (blog-prefix ""))
"Convert POST into an Atom <entry> XML node."
`(entry
(title ,(post-ref post 'title))
(author
(name ,(post-ref post 'author))
,(let ((email (post-ref post 'email)))
(if email `(email ,email) '())))
(updated ,(date->string* (post-date post)))
(link (@ (href ,(string-append blog-prefix "/"
(site-post-slug site post) ".html"))
(rel "alternate")))
(summary (@ (type "html"))
,(sxml->html-string (post-sxml post)))))
(define* (atom-feed #:key
(file-name "feed.xml")
(subtitle "Recent Posts")
(filter posts/reverse-chronological)
(max-entries 20)
(blog-prefix ""))
"Return a builder procedure that renders a list of posts as an Atom
feed. All arguments are optional:
FILE-NAME: The page file name
SUBTITLE: The feed subtitle
FILTER: The procedure called to manipulate the posts list before rendering
MAX-ENTRIES: The maximum number of posts to render in the feed"
(lambda (site posts)
(make-page file-name
`(feed (@ (xmlns "http://www.w3.org/2005/Atom"))
(title ,(site-title site))
(subtitle ,subtitle)
(updated ,(date->string* (current-date)))
(link (@ (href ,(string-append (site-domain site)
"/" file-name))
(rel "self")))
(link (@ (href ,(site-domain site))))
,@(map (cut post->atom-entry site <>
#:blog-prefix blog-prefix)
(take-up-to max-entries (filter posts))))
sxml->xml*)))
(define* (atom-feeds-by-tag #:key
(prefix "feeds/tags")
(filter posts/reverse-chronological)
(max-entries 20)
(blog-prefix ""))
"Return a builder procedure that renders an atom feed for every tag
used in a post. All arguments are optional:
PREFIX: The directory in which to write the feeds
FILTER: The procedure called to manipulate the posts list before rendering
MAX-ENTRIES: The maximum number of posts to render in each feed"
(lambda (site posts)
(let ((tag-groups (posts/group-by-tag posts)))
(map (match-lambda
((tag . posts)
((atom-feed #:file-name (string-append prefix "/" tag ".xml")
#:subtitle (string-append "Tag: " tag)
#:filter filter
#:max-entries max-entries
#:blog-prefix blog-prefix)
site posts)))
tag-groups))))
|
