Re: changing the display of formfeed characters

[Nick Helm <nick@tenpoint.co.nz>]

Javier <invalid@invalid.invalid> writes:

> Has somebody come with any idea how to display ^L in some way without
> breaking whitespace-mode?

You could use whitespace-mode itself to display form-feeds. Assuming you
have whitespace-mode's newline style enabled, try evaling something like
this before you start whitespace-mode:

(add-to-list 'whitespace-display-mappings
             '(newline-mark ?\^L [?= ?= ?=]))

If you want the line to extend across the width of your current window,
you could eval something like this instead:

(add-to-list 'whitespace-display-mappings
             `(newline-mark ?\^L ,(make-vector (1- (window-width)) ?=)))

You might also be able to use window-configuration-change-hook or
similar to adapt the length of the line as you resize the width of your
window.