A function for jumping to a project TODO file

I've had org-projectile in my config since the beginning, and while it's worked nicely for me in my main config it gave me some grief when I played around with elpaca the other week.¹

I tried to get the install instructions to work, but kept on getting errors when loading my config. Given that I only use it for one thing, to open the file TODO.org in the current project's root, I decided to just write a function for doing that instead.

(defun mep-projectile-open-todo ()
  "Open the project's todo file."
  (interactive)
  (if-let* ((proj-dir (projectile-project-root))
            (proj-todo-file (f-join proj-dir "TODO.org")))
      (org-open-file proj-todo-file)
    (message "Not in a project")))