It’s always satisfying to cross something off a to-do list, almost like declaring to yourself, ‘I did it!’ That’s the feeling I wanted to bring into Emacs Org Mode.

The following Emacs Lisp (Elisp) code instructs Emacs to apply a strike-through to any task marked as DONE:

;; Enable the fontification of headlines for tasks that have been marked as
;; completed.
(setq org-fontify-done-headline t)

(custom-set-faces
 ;; Face used for todo keywords that indicate DONE items.
 '(org-done ((t (:strike-through t))))

 ;; Face used to indicate that a headline is DONE. This face is only used if
 ;; ‘org-fontify-done-headline’ is set. If applies to the part of the headline
 ;; after the DONE keyword.
 '(org-headline-done ((t (:strike-through t)))))
Code language: Lisp (lisp)

By adding strike-through for completed items, Emacs Org Mode becomes clearer and more satisfying to use.

The built-in method used by Emacs Org mode to insert new headings does not automatically prepend the inserted heading with TODO, except when C-S-<return> is pressed. I prefer using C-<return> for all headings, whether they are to-do tasks or not, to maintain my workflow efficiency. This motivated me to write the function outlined in this article.

The function below can be triggered by pressing C-<return> to insert a new Org heading. If activated while on a TODO task, it will prefix the inserted heading with TODO, effectively creating a new to-do item. Additionally, for users of evil-mode, the function transitions into insert mode.

;; Function: (my-org-insert-heading-respect-content-and-prepend-todo)
;; Author: James Cherti
;; License: MIT
;; Key binding: Ctrl-Enter
;; URL: https://www.jamescherti.com/emacs-add-todo-keyword-to-new-org-mode-headings/
;;
;; Description: The function inserts a new heading at the current cursor
;; position, and prepends it with "TODO " if activated while on a "TODO" task,
;; thus creating a new to-do item. In addition to that, for those utilizing
;; evil-mode the function transitions the user into insert mode right after the
;; "TODO " insertion.

(defun my-org-insert-heading-respect-content-and-prepend-todo ()
    "Insert a new org-mode heading respecting content and prepend it with 'TODO'.
  Additionally, ensure entry into insert state when evil-mode is active."
    (interactive)
    (let ((entry-is-todo (org-entry-is-todo-p)))
      (when (bound-and-true-p evil-mode)
        (evil-insert-state))
      (org-insert-heading-respect-content)
      (when entry-is-todo
        (just-one-space)
        (insert "TODO")
        (just-one-space))))

;; Replace the key bindings for inserting headings in Org mode
(define-key org-mode-map (kbd "C-<return>")
            'my-org-insert-heading-respect-content-and-prepend-todo)
Code language: Lisp (lisp)