Tips for org-mode 8 user

org-mode 9.x has some breaking changes on export blocks, if you still want to use org-mode 8's syntax, here's the little guide on how to let coldnew/hexo-renderer-org renderer the org-mode 8 syntax properly.

Before we started, let's look again what's different between org-mode 8 and org-mode 9:

Oh, no. The export block syntax is different, let's add some snippet to let coldnew/hexo-renderer-org can fix the render result:

First, add following to your _config.yml

  # skip ...
  user_config: './emacs/init.el'

Then add following code to your ./emacs/init.el.

(defun org-mode-compability-fixup ()
  ;; http://orgmode.org/Changes.html#orgf3f9c91
  ;; Repair export blocks and INCLUDE keywords in current buffer.
  (let ((case-fold-search t)
        (back-end-re (regexp-opt
                      '("HTML" "ASCII" "LATEX" "ODT" "MARKDOWN" "MD" "ORG"
                        "MAN" "BEAMER" "TEXINFO" "GROFF" "KOMA-LETTER")
     (goto-char (point-min))
     (let ((block-re (concat "^[ \t]*#\\+BEGIN_" back-end-re)))
         (while (re-search-forward block-re nil t)
           (let ((element (save-match-data (org-element-at-point))))
             (when (eq (org-element-type element) 'special-block)
                 (goto-char (org-element-property :end element))
                 (save-match-data (search-backward "_"))
                 (insert "EXPORT")
                 (delete-region (point) (line-end-position)))
               (replace-match "EXPORT \\1" nil nil nil 1))))))
     (let ((include-re
            (format "^[ \t]*#\\+INCLUDE: .*?%s[ \t]*$" back-end-re)))
       (while (re-search-forward include-re nil t)
         (let ((element (save-match-data (org-element-at-point))))
           (when (and (eq (org-element-type element) 'keyword)
                      (string= (org-element-property :key element) "INCLUDE"))
             (replace-match "EXPORT \\1" nil nil nil 1))))))))

We also need to overwrite the hexo-renderer-org-exporter like this:

(add to your ./emacs/init.el too)

(defun hexo-renderer-org-exporter ()
  "The exporter function.
When execute this function, we must in the `org-mode' file.
This function is intend to let user overwrite in their user-config."
  ;; Convert org-mode 8.x -> org-mode 9.x
  ;; Export the result

Ok, restart your hexo and you'll find coldnew/hexo-renderer-org can renderer org-mode 8 syntax now :)