;;; publish.el --- Publishing configuration for ryuslash.org  -*- lexical-binding: t; -*-

;; Copyright (C) 2020  Tom Willemse

;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords:
;; Version: 1
;; Package-Requires: (dockerfile-mode htmlize org org-contrib rainbow-delimiters ox-rss)

;; 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 <https://www.gnu.org/licenses/>.

;;; Commentary:

;;

;;; Code:

(require 'dockerfile-mode)
(require 'ob-dot)
(require 'ox-publish)
(require 'ox-rss)
(require 'rainbow-delimiters)
(require 'subr-x)

(defconst publish-root
  (file-name-directory
   (or load-file-name
       (buffer-file-name)))
  "The directory where ‘oni-org’ was loaded from.")

(add-hook 'prog-mode-hook 'rainbow-delimiters-mode)

(defun publish-calculate-reading-time (buffer)
  "Calculate the amount of minutes it would take to read the contents of BUFFER."
  (with-current-buffer buffer
    (max 1 (/ (count-words (point-min) (point-max)) 228))))

(defun publish-format-reading-time (time)
  "Return a string describing TIME."
  (format "%d minute%s"
          time
          (if (= time 1) "" "s")))

(defun publish-generate-index (props)
  "Generate an index from my posts.
Argument PROPS
."
  (let ((files (directory-files "posts/" t (rx bos (= 8 digit) "-" (= 4 digit) "-" (one-or-more nonl) (not "~") eos))))
    (with-temp-buffer
      (apply 'insert
             (mapcar (lambda (file)
                       (format "* %s\n:PROPERTIES:\n:CUSTOM_ID:  %s\n:PUBDATE:  %s\n:RSS_PERMALINK:  %s\n:END:\n\n%s[[file:%s][Read More]]\n\n"
                               (car (org-publish-find-property file :title props))
                               (file-name-nondirectory file)
                               (format-time-string "[%Y-%m-%d %a %H:%M]" (org-timestamp-to-time (car (org-publish-find-property file :date props))))
                               (file-name-nondirectory file)
                               (car (org-map-entries (lambda () (let ((element-data (cadr (org-element-at-point))))
                                                                  (buffer-substring-no-properties
                                                                   (map-elt element-data :contents-begin)
                                                                   (map-elt element-data :contents-end))))
                                                     "summary"
                                                     (list file)))
                               (file-name-nondirectory file)))
                     (take 30 (reverse files))))
      (write-file "posts/index.org"))))

(setq org-export-exclude-tags '("noexport" "draft"))

(setq org-confirm-babel-evaluate nil)

(setq org-html-head-include-default-style nil)

(setq org-html-htmlize-output-type 'css)

(setq org-publish-timestamp-directory
      (concat default-directory "/.org-timestamps/"))

(setq org-html-html5-fancy t)

(setq org-html-doctype "html5")

(setq org-publish-project-alist
      `(("index"
         :base-directory "."
         :base-extension "org"
         :publishing-directory "public/"
         :recursive t
         :exclude ,(rx string-start
                       (or "posts/"
                           (and "README.org" string-end)))
         :publishing-function org-html-publish-to-html
         :html-head "<link rel=\"stylesheet\" href=\"/assets/css/main.css\" type=\"text/css\"/>"
         :html-postamble t
         :html-postamble-format (("en" "<p class=\"social social-mastodon\">Find me on <a href=\"https://fosstodon.org/@ryuslash\" rel=\"me\">Mastodon</a></p>
<p class=\"date\">Date: %C</p>
<p class=\"creator\">%c</p>")))
        ("posts"
         :base-directory "posts/"
         :base-extension "org"
         :publishing-directory "public/posts/"
         :recursive t
         :publishing-function org-html-publish-to-html
         :html-head "<link rel=\"stylesheet\" href=\"/assets/css/main.css\" type=\"text/css\"/>"
         :html-preamble (lambda (project)
                          (let ((buffer (find-file-noselect (buffer-file-name))))
                            (unless (member (car (org-publish-find-property (buffer-file-name) :title project))
                                             '("ryuslash.org" "posts"))
                              (publish-format-reading-time
                               (publish-calculate-reading-time buffer))))))
        ("rss"
         :base-directory "posts/"
         :base-extension "org"
         :rss-extension "xml"
         :preparation-function publish-generate-index
         :publishing-directory "public/posts/"
         :publishing-function (org-rss-publish-to-rss)
         :html-link-home "https://ryuslash.org/posts/"
         :html-link-use-abs-url t
         :section-numbers nil
         :exclude ".*"
         :include ("index.org")
         :table-of-contents nil)
        ("assets"
         :base-directory "."
         :recursive t
         :exclude "^public/"
         :base-extension "svg\\|png\\|jpg"
         :publishing-function org-publish-attachment
         :publishing-directory "public/")
        ("all" :components ("index" "posts" "rss" "assets"))))

(defvar publish-feed-url-format
  ;"https://gitlab.com/ryuslash/ryuslash.org/-/commits/master/%s?feed_token=Rf8otgpS8YEiYakJN4NR&format=atom"
  "https://code.ryuslash.org/new-ryuslash.org/atom/%s?h=master"
  "Format string for the URL to the page’s atom feed.")

(provide 'publish)
;;; publish.el ends here