It's not "please write this code for me" question. Rather, it's "please, grep your ~/.emacs.d and paste defun that you wrote (or borrowed from someone) years ago". Elisp code lifecycle is different than usual code and it's reusability is much higher than other kinds of code. I have bits of Elisp in my config which were written in the '80ies, obtained very much in the same manner: by asking for it on mailing lists. The code is there, its discoverability sucks, which is why questions such as this are legitimate in case of Emacs, even if it would be different in case of other languages adn environments.

Not taking into account specifics of a particular domain - along with questions being judged by people who have no idea what is being asked, but feel the need to judge - was the very thing which made me leave SO.