How to call (line-end-position) that returns a value excluding trailing whitespace?

Question

What is a good way to replace (line-end-position) with a function that doesn't include trailing whitespace?

Answer 1

Without an argument, (line-end-position) is functionally equivalent to (save-excursion (end-of-line) (point)). Armed with that knowledge, your custom function could be defined as follows:

(defun my-line-end-position ()
  (save-excursion
    (end-of-line)
    (skip-syntax-backward "-")
    (point)))