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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: can font-lock hide parts of text?
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Miguel Frasson <frasson@enquist.math.leidenuniv.nl> writes:

> I would like to sort of make invisible some text that matches a
> regexp. Supose I have a chordpro line like
>
>  [A]This is a [G]Song
>
> I would like to be able to make an option that shows
>   ^This is a ^Song
> where ^ is some mark (in a different color) that there there is a chord.
>
> Someone has a clue?

You could probably do something similar to Oliver Scholz's lambda
prettifying code.  See <news:m3n0rory6t.fsf@ID-87814.user.dfncis.de>
in gnu.emacs.sources.