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;;; Copyright © 2019 - 2020 Jakob L. Kreuze <zerodaysfordays@sdf.org>
;;;
;;; 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, see
;;; <http://www.gnu.org/licenses/>.
(define-module (jakob builder blog)
#:use-module (haunt html)
#:use-module (haunt page)
#:use-module (haunt post)
#:use-module (haunt utils)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (jakob dynamic capabilities comment-form)
#:use-module (jakob theme)
#:use-module (jakob utils)
#:use-module (jakob utils pagination)
#:use-module (jakob utils sxml)
#:use-module (jakob utils tags)
#:use-module (jakob utils comments)
;; #:use-module (jakob utils webmention)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (web uri)
#:export (post-uri
blog))
;;; Commentary:
;;;
;;; In favor of greater flexibility, Haunt's default 'blog' builder was not used
;;; for this site. This modules implements a similar builder, 'blog', with
;;; pagination and support for tag navigation.
;;;
;;; Code:
;;;
;;; Rendering.
;;;
(define (build-comment-url post)
(format #f "/api/comment-form/~a" (post-slug post)))
(define (render-article post)
"Return the SHTML for POST's contents."
#<(main
(h1 ,(post-ref post 'title))
(p ,(date->string (post-date post) "~B ~d, ~Y")
" ❖ "
"Tags: "
,@(intersperse
(map (lambda (tag)
(hyperlink (tag-uri %tag-prefix tag) tag))
(post-ref post 'tags))
", "))
,(when (post-ref post 'crosspost)
`(p (strong "This is a summary ")
"of a post that was published elsewhere. "
"To read the full post, visit "
,(hyperlink (post-ref post 'crosspost) "this link")
"."))
(article ,(post-sxml post))
(section
(@ (id "webmention"))
(h2 "Comments for this page")
(ul (@ (id "webmention-container"))
,@(render-comment-view (fetch-comments (post-identifier post)) (fetch-webmentions (post-identifier post))))
(div (@ (id "comment-form-primary") (hidden #t))
,(render-dynamic-comment-form (post-identifier post)))
(p (@ (id "comment-form-alt"))
"Click " ,(hyperlink (build-comment-url post) "here") " to write a comment on this post.")
(form
(@ (id "webmention-form")
(action "https://webmention.io/jakob.space/webmention")
(method "post"))
(label "Alternatively, if you've written about this "
,(hyperlink "https://indieweb.org/responses" "elsewhere")
", you can let me know the URL:")
(input (@ (name "source") (type "url")))
(input (@ (value "Send Webmention") (type "submit"))))
,(script "section-folds.js")
;; ,(script "webmention.js")
)))
(define (render-preview post)
"Return the SHTML for a preview of POST."
(let ((crosspost-uri (post-ref post 'crosspost))
(local-uri (post-uri post)))
#<(section
(h2 ,(hyperlink (or crosspost-uri local-uri) (post-ref post 'title)))
(p ,(date->string (post-date post) "~B ~d, ~Y")
,(when crosspost-uri
(list " ↻ " (hyperlink local-uri "Crosspost")))
" ❖ Tags: "
,@(intersperse
(map (lambda (tag)
(hyperlink (tag-uri %tag-prefix tag) tag))
(post-ref post 'tags))
", "))
(p ,(first-paragraph post))
,(hyperlink (or crosspost-uri local-uri) "read more →"))))
;;;
;;; Creation of permalink pages for individual lposts.
;;;
;; Subdirectory for permalink pages.
(define %prefix "/blog")
(define (post-identifier post)
"Return the 'slug' that identifies POST."
(let* ((file-name (post-file-name post))
(splice-start (1+ (string-rindex file-name (cut char=? <> #\/))))
(splice-end (string-rindex file-name (cut char=? <> #\.)))
(slug (substring file-name splice-start splice-end)))
slug))
(define (post-uri post)
"Return the path of POST relative to the site's root."
(string-append %prefix "/" (post-identifier post) ".html"))
(define (post->page post)
"Return a Haunt page for POST."
(define meta-tags (call-with-input-string (post-ref post 'meta-tags) read))
(define scripts (call-with-input-string (post-ref post 'scripts) read))
(make-page (post-uri post)
(theme #:title (post-ref post 'title)
#:description (description-from-post post)
#:keywords (post-ref post 'tags)
#:meta (if (not (eof-object? meta-tags)) meta-tags '())
#:scripts (if (not (eof-object? scripts)) scripts '())
#:content (render-article post))
sxml->html))
;;;
;;; Navigation based on post tags.
;;;
;; Subdirectory for post listings conditioned on post tags.
(define %tag-prefix "/blog/tag")
(define (tags->pages posts)
"Return a list of pages for each tag used in POSTS, with said pages containing
only the posts tagged with that tag."
(flat-map (match-lambda
((tag . posts)
(items->pages render-preview posts
(format #f "Posts tagged with \"~a\"" tag)
(tag-uri %tag-prefix tag ""))))
(group-by-tag (sort posts (lambda (a b)
(time<? (date->time-monotonic (post-date a)) (date->time-monotonic (post-date b))))) (cut post-ref <> 'tags))))
(define (all-tags posts)
"Return a page summarizing tag usage across POSTS."
(define content
`((h1 "All Tags")
(ul (@ (id "tag-cloud"))
,@(map (match-lambda
((tag count)
(hyperlink (tag-uri %tag-prefix tag)
`(li ,(format #f "~a (~a)" tag count)))))
(count-tags posts (cut post-ref <> 'tags))))))
(make-page "tag.html"
(theme #:title "All Tags"
#:content content)
sxml->html))
;;;
;;; Builder.
;;;
(define (blog)
"Return a Haunt build procedure to create permalinks and post listings for all
of the 'post' objects associated with the site."
(lambda (site posts)
(append
;; Permalinks.
(map post->page posts)
;; Main post navigation.
(items->pages render-preview (posts/reverse-chronological posts)
"Recent Posts" "index")
;; Tag-based navigation.
(list (all-tags posts))
(tags->pages posts))))
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