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-rw-r--r--Makefile.am1
-rw-r--r--haunt/builder/atom.scm104
2 files changed, 105 insertions, 0 deletions
diff --git a/Makefile.am b/Makefile.am
index e4ebd21..d585ee5 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -47,6 +47,7 @@ SOURCES = \
haunt/page.scm \
haunt/site.scm \
haunt/build/html.scm \
+ haunt/builder/atom.scm \
haunt/ui.scm \
haunt/ui/build.scm \
haunt/ui/serve.scm \
diff --git a/haunt/builder/atom.scm b/haunt/builder/atom.scm
new file mode 100644
index 0000000..337de6d
--- /dev/null
+++ b/haunt/builder/atom.scm
@@ -0,0 +1,104 @@
+;;; 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:
+;;
+;; Atom feed builder.
+;;
+;;; Code:
+
+(define-module (haunt builder atom)
+ #:use-module (srfi srfi-19)
+ #: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 build 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 post)
+ "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-ref post 'date)))
+ (link (@ (href ,(string-append "/" (post-slug 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))
+ "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 "/" file-name))
+ (rel "self")))
+ (link (@ (href ,(site-domain site))))
+ ,@(map post->atom-entry
+ (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))
+ "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)
+ site posts)))
+ tag-groups))))