Useful commands

A smarter kill-line

This kill-line command will kill backward if nothing can be killed forward. So you can press C-k twice to kill the part inside the pairs. One more C-k will kill the pairs.

(defun my-kill-line ()
  "Kill a line forward while keeping expressions balanced.
If nothing can be deleted, kill backward.  If still nothing can be
deleted, kill the pairs around point."
  (interactive)
  (let ((bounds (puni-bounds-of-list-around-point)))
    (if (eq (car bounds) (cdr bounds))
        (when-let ((sexp-bounds (puni-bounds-of-sexp-around-point)))
          (puni-delete-region (car sexp-bounds) (cdr sexp-bounds) 'kill))
      (if (eq (point) (cdr bounds))
          (puni-backward-kill-line)
        (puni-kill-line)))))