'''highlight-indentation''' by AntonJohansson is a function made to show vertical guide lines of indentation levels (spaces only). The code is available at:

https://github.com/antonj/Highlight-Indentation-for-Emacs/

== Usage ==

Appearance of guidelines is customizable by changing the face `highlight-indent-face'. By default, `highlight-indent-face' inherits from `fringe', which in most color-themes has an unobtrusive color.

== Screenshot ==

http://i.imgur.com/F509p.png

== Discussion ==

This looks really neat. Is there a way to extend it to work with Lisp code? Something like the following:

    (if n
    |   (let ((m 0) (p list))
    |   | (while (consp p)
    |   | | (setq m (1+ m)
    |   | | |     p (cdr p)))
    |   | (if (<= n 0) p
    |   | | (if (< n m)
    |   | | |   (nthcdr (- m n) list)
    |   | | | list)))
    | (while (consp (cdr list))
    | | (setq list (cdr list)))
    | list)

It would really improve the readability of long ##if## forms like above (this is taken from the definition of `last' in ##subr.el##). -- VegardOye

[new]

In its current form, the actual functionality of `highlight-indentation' is very trivial: font-lock a space character followed by a fixed amount of space characters. So for it to work with lisp's variable indentation some major changes are needed... -- AntonJohansson

[new]

https://github.com/ran9er/init.emacs/blob/master/20_aux-line.el

[http://forum.ubuntu.org.cn/download/file.php?id=154714 Screenshot]

[new]

That link to ran9er's !GitHub repo seemed to have moved to [https://github.com/ran9er/init.emacs/blob/master/_lib/indent-hint.el indent-hint.el].

[new]

For a more complex approach, see [https://github.com/DarthFennec/highlight-indent-guides highlight-indent-guides]

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