Re: Smarter M-x that filters on major-mode

[Jose A. Ortega Ruiz]

On Thu, Feb 11 2021, Lars Ingebrigtsen wrote:

> We now have
>
> (defun foo2 (arg)
>   (command c-mode "p")
>   (message "%s 2" arg))

You probably have already thought of it, and discarded it for a good
reason, but why not, instead of a new `command' form, just add a new
(optional) argument to `interactive'?

  (defun foo2 (arg)
   (interactive "p" c-mode)
   (message "%s 2" arg))

it could even accept more than one mode

  (defun foo2 (arg)
   (interactive "p" text-mode json-mode)
   (message "%s 2" arg))

and for users it'd be arguably easier to recognize what it means at a
glance (since we all know about `interactive').

i could even imagine a top level declaration like, say,
`(default-interactive-mode my-mode)' which would supply to all commands
in that .el that value for the optional arg (to easyly update packages
that define a mode and mostly commands just for it, something i at least
do very often), adding just a line to the file.  or it could be a local
variable and work a bit like lexical-binding...

;;; my-mode.el --- a very useful mode -*- interactive-mode: my-mode -*-