transient-defvar

[Psionic K]

Some toying with the transient-lisp-variable gave me a useful idea for package authors:

(defcustom my-custom-variable
    :type 'natnum)

;; note, use of defvar style signature, setting the default value to any value or literal, like defvar
(transient-defvar my-transient-variable my-custom-variable
    :key "v"
    :description "variable"
    :buffer-local nil
    :type 'natnum )

(transient-define-prefix use-vars ()
    [(my-transient-variable)])

The concept is to combine the defvar and the transient-define-infix. The :type argument would allow use of custom style readers. Normal :reader and :type should be exclusive.

With some effort to consume existing defvar's and give them an infix, the transient-define-prefix macro could decide to create new variables or re-use the already created suffix if the same variable was re-defined (redundantly) in multiple prefixes.

The variable would implement a lisp-variable that points toward a new defvar and uses custom and other reader choices. The transient suffix behavior in #261 would set and return the value for use in interactive forms.

This would be valuable for more quickly building transients that pull together a coherent UI for normal Elisp packages building on custom and interactive.