bug#69079: [PATCH] Add 'customize-toggle-option' command

[Philip Kaludercic <philipk@posteo.net>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Philip Kaludercic <philipk@posteo.net>
>> Date: Mon, 12 Feb 2024 17:32:37 +0000
>> 
>> +;;;###autoload
>> +(defun customize-toggle-option (opt)
>> +  "Toggle the value of boolean option OPT for this session."
>> +  (interactive (let (opts)
>> +		 (mapatoms
>> +		  (lambda (sym)
>> +		    (when (eq (get sym 'custom-type) 'boolean)
>> +		      (push sym opts))))
>> +		 (list (intern (completing-read "Option: " opts)))))
>> +  (message "%s user options '%s'."
>> +	   (if (funcall (or (get opt 'custom-set) #'set-default)
>> +			opt (not (funcall (or (get opt 'custom-get)
>> +					      #'symbol-value)
>> +					  opt)))
>> +	       "Enabled" "Disabled")
>> +	   opt))
>
> Shouldn't this have some validation? what if the argument OPT is not a
> boolean?

My assumption was that the command would only be invoked interactivly,
so I can either make that explicit with an `interactive-only' or repeat
the check.  What do you think would be better?

> And the prompt should IMO say "Toggle boolean option: ".

Good point.