Re: Limit what M-x TAB lists?

[Lars Ingebrigtsen <larsi@gnus.org>]

Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

>> 2) New form like (command-interactive 'vc-mode "p")
>
> More generally, move the "sanity checks" performed at the beginning of
> some commands to a special place so they can be run without actually
> calling the function.  IOW add a "callable" predicate alongside the
> interactive-spec that M-x could then use to filter out
> inapplicable commands.

Hm, yes, that would be nice.  Then multi-mode commands like
`quit-window' could have a complex predicate that does the right thing,
while very mode-specific commands like `gnus-summary-catchup-to-here'
could have a simple (mode-only) predicate.

If these predicates become very complex, then `M-x fooTAB' would become
exceedingly slow, though...

> Of course, this will require many changes in many packages before it
> becomes really useful.

Yes, but modes could be converted gradually, and things would get better
and better as time passes...

-- 
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