;; Automatically reload files if modified outside of the editor.
(global-auto-revert-mode)

;; Overwrite selected text when typing.
(delete-selection-mode)

;; Display line numbers.
(global-display-line-numbers-mode)

;; Display a ruler in the 80th column.
(setq-default display-fill-column-indicator-column 80)
(add-hook 'prog-mode-hook #'display-fill-column-indicator-mode)
(add-hook 'text-mode-hook #'display-fill-column-indicator-mode)

;; Whitespace settings:
;;  - Tabs are 4 space characters (as the gods intended)
;;  - Ensure a newline character is present at the end files when saving
;;  - Clean up extraneous whitespace when saving
(setq-default indent-tabs-mode nil
              tab-width        4)
(setq require-final-newline t)
(add-hook 'before-save-hook 'whitespace-cleanup)