;;; -*- lexical-binding: t -*-

(setq frame-title-format '((:eval (funcall #'my/generate-frame-title))))

(setq icon-title-format frame-title-format)

(add-to-list 'post-command-hook #'my/terminal-update-title)


(defun my/generate-frame-title ()
  "Returns a string like 'filename (dirname) - Emacs'"
  (if (buffer-file-name)
      (concat
       (file-name-nondirectory (buffer-file-name))
       (if (buffer-modified-p)
           " +")
       " ("
       (abbreviate-file-name (substring (file-name-directory (buffer-file-name)) 0 -1))
       ") - Emacs"
       )
    (concat
     (buffer-name)
     (if (buffer-modified-p)
         " +")
     " - Emacs")))

(defun my/terminal-update-title ()
  "If using a terminal frame then sends the escape codes to update the title."
  (if (terminal-parameter (frame-terminal) 'terminal-initted)
      (send-string-to-terminal (concat "\033]0;" (my/generate-frame-title) "\007"))))