How can I make emacs highlight lines that go over 80 chars?

Question

I know there are solutions to making emacs show the 80 line column, but I don\'t want that sort of visual disturbance. I\'d just like to make it highlight a line if it\'s ov

Answer 1

There is a built-in package in emacs-goodies-el(recommend to install it in terminal) called highlight-beyond-fill-column.el, add this to your .emacs or init.el:

(setq-default fill-column 80)
(add-hook 'prog-mode-hook 'highlight-beyond-fill-column)
(custom-set-faces '(highlight-beyond-fill-column-face
                    ((t (:foreground "red" )))))

The text beyond fill-column which is 80 in the snippet will be highlighted with the color of red. You can set the face as you like.