Proposal for `define-toggle-variable'
Zajcev Evgeny writes:
I would like to see macro like below, defined somewhere in (S)XEmacs
distribution:
(defmacro define-toggle-variable (var value doc &rest args)
"Define new toggle variable.
VAR is either a symbol, or list of two symbols in form
(VARNAME FUNCNAME), where VARNAME specifies name for variable and
FUNCNAME specifies name for toggle command.
VALUE, DOC and ARGS are same as for `defcustom'.
ARGS may content additional :message keyword of boolean value.
If value for :message keyword is non-nil then display message in echo
area when toggling value."
I think this is a good idea. I think it belongs in custom.el.
FWIW YMMV IGWTF[1]:
(1) I don't like the idea of (VARNAME FUNCNAME); I think standardizing
on toggle-VARNAME, turn-on-VARNAME, turn-off-VARNAME is preferable.
This would make creating menu items for them automatable. If you
really want FUNCNAME to be arbitrary, you could put a property on
VARNAME to get the same ability.
Which of these to create would be determined by a keyword
:define-toggle-functions whose value would be a list containing
'toggle, 'turn-on or both ('turn-on implies defining turn-off-VARNAME,
too). Optionally accept 'toggle or 'turn-on as symbols as well as
list members.
(2) toggle-VARNAME is not the right English for the function you
define. Maybe it's OK, but my first reaction is that it will take
users a long time to adjust to it. Seems more like VARNAME-mode in
GNU Emacs-ish.
Footnotes:
[1] I'll Go With The Flow
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