nixos/home/emacs/modules/custom-org-config.el

(setq org-directory "~/Org"
      org-journal-dir "~/Org/journal/"
      org-journal-file-type 'daily
      org-journal-file-format "%Y%m%d.org"
      org-agenda-files '("~/Org/")
      org-agenda-sticky t
      org-agenda-prefix-format '((agenda . " %i %t %s")
                                 (todo . " %i")
                                 (tags . " %i")
                                 (search . " %i"))
      org-refile-use-outline-path t
      org-refile-allow-creating-parent-nodes t
      org-refile-targets '((nil :maxlevel . 3)
                           (org-agenda-files :maxlevel . 3)))

(defun my/org-move-done-tasks-to-bottom ()
  "Sort all tasks in the topmost heading by TODO state."
  (interactive)
  (save-excursion
    (while (org-up-heading-safe))
    (org-sort-entries nil ?o))

  ;; Reset the view of TODO items
  (org-overview)
  (org-show-entry)
  (org-show-children))

(when (require 'org nil :noerror)
  (add-hook
   'org-mode-hook
   (lambda () (add-hook
          'before-save-hook
          #'my/org-move-done-tasks-to-bottom
          nil
          'local))))

(provide 'custom-org-config)