Select candidates from minubuffer using M-{number} (up to 10 candidates)

setup-minibuffer.el

(use-package general
  :ensure t)

(defun selectrum-define-keys ()
  (dotimes (i (min selectrum-num-candidates-displayed 10))
    (general-define-key
     :keymaps 'selectrum-minibuffer-map
     (format "M-%d" (mod (1+ i) 10))
     `(lambda ()
        (interactive)
        (selectrum-select-current-candidate ,(1+ i))))))

(use-package selectrum
  :ensure t
  :config
  (selectrum-mode +1)
  (selectrum-define-keys))