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What I want to do: have the function evil-delete do one more task after its usual code. (I'm presuming that evil-delete is the underlying workhorse that is called by evil-delete-line and about five other functions.) evil-delete takes optional parameters.

In a scheme, I'd write:

(define  original-evil-delete  evil-delete) ; capture the original binding

(define (evil-delete-then-gui-set-selection . args)
    "Delete, and copy deleted-text into the OS clipboard."
    (prog1 (apply original-evil-delete args)
           (gui-set-selection 'CLIPBOARD (current-kill 0))))

(set!  evil-delete  evil-delete-then-gui-set-selection)
; I want this "new" binding to be used in other functions that call `evil-delete`.

But between lisp's defvar-vs-defun distinction, possibly-dynamic scoping, and forwarding optional-args, I'm having a bit of trouble translating this scheme to elisp. Any help appreciated. (I don't think I need to worry about "interactive", at least?)

Also, if there is a better way of doing this -- e.g. some hook available -- then I'd appreciate hearing that too. Finally, it's not out-of-question that I instead make new versions of the ~dozen "wrapper" functions and re-bind all the keys to use these new versions, thereby avoiding most issues except forwarding-default-args.

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