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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: How do you write input methods?
Date: Mon, 30 Aug 2021 17:00:26 +0300
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To: "Perry E. Metzger" <perry@piermont.com>
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> Date: Mon, 30 Aug 2021 09:40:26 -0400
> Cc: emacs-devel@gnu.org
> From: "Perry E. Metzger" <perry@piermont.com>
> 
> On 8/30/21 07:46, Eli Zaretskii wrote:
> >> Do any documents exist at all on how to define a new input method
> > No.
> >
> >> or do I have to read the code?
> > Yes.
> >
> That's rather unfortunate. I hope someone who knows it well might write 
> some documentation at some point.

Alas, we don't have anyone like that on board.  However, adding simple
input methods, like those where you type a small number of ASCII
characters to produce a non-ASCII character, is easy enough by looking
at existing input methods for various Latin languages.  It's pretty
much boilerplate code.