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Re: Qs on key-description, substitute-command-keys

From: Stefan Monnier
Subject: Re: Qs on key-description, substitute-command-keys
Date: Sat, 15 Oct 2005 07:54:14 -0400
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

> Does anyone know how to control which of several bindings for a command is
> displayed by `substitute-command-keys'?

There is no way to get this kind of control.  `substitute-command-keys' has
some rules such as "prefer a binding using plain ascii keys" (so it'll
prefer C-x < over C-next, based on the principle that not all terminals have
a `next' key and even fewer have a way to generate a C-next event) and
"prefer a shorter binding".

In Emacs, what we do usually when we need to control which binding to show,
is to define `advertized-foo' as an alias for `foo' and then bind the key we
want shown to `advertized-foo' (and then use \\[advertized-foo] in the
string).  I find this to be a bad solution: it interacts very poorly with
things like `remap' or `substitute-key-definition' and C-h f `foo' forgets
to show the main advertized binding (bummer!).

I think we should devise some way to get the desired result without going
through contorsions like `advertized-bla'.  I haven't thought very deep
about how to do that, but the first thing that jumps to my mind is to rely
on a `preferred-binding' property (containing a key-sequence) on the command
symbol, or otherwise require the use of a menu-item for the main binding and
then obey a boolean ":preferred-binding" property placed on the menu-item.


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