From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eli Zaretskii <eliz@gnu.org>
Subject: Re: Enriched/Org is a colorful Org
Date: Fri, 12 Apr 2013 21:38:47 +0300
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To: Suvayu Ali <fatkasuvayu+linux@gmail.com>
Cc: emacs-orgmode@gnu.org, carsten.dominik@gmail.com

> Date: Fri, 12 Apr 2013 20:00:56 +0200
> From: Suvayu Ali <fatkasuvayu+linux@gmail.com>
> Cc: Torsten Wagner <torsten.wagner@gmail.com>, emacs-orgmode@gnu.org,
> 	carsten.dominik@gmail.com
> 
> If some package wants to keep something updated (line number displays in
> this case), is using the post-command-hook the only option?

No.  The other one is piggy-back jit-lock.  See nlinum in ELPA for an
example, which actually is a drop-in replacement for linum, but
without many of its problems.