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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Supporting tabs for indentation, spaces for alignment
Date: Thu, 11 Apr 2019 16:29:26 +0300
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References: <20190411090223.GA5183@ACM> <20190411102405.vcwdygrz36cjt3ld@Ergus>
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Cc: acm@muc.de, emacs-devel@gnu.org
To: Ergus <spacibba@aol.com>
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> Date: Thu, 11 Apr 2019 12:24:05 +0200
> From: Ergus <spacibba@aol.com>
> Cc: emacs-devel@gnu.org
> 
> So the users could find their needs without writing 40 lisp lines and
> read 20 manual pages full of therms that makes sense only after reading
> 1000 previous pages.

I don't think you need to write any Lisp for that: CC Mode includes a
feature called "Interactive Customization of Indentation", read all
about it in the CC Mode manual.