A way to scan the lisp to get the name of all variables

[Djwhitelion]

A way to scan the lisp document and/or the defun to get all variables.
It would be awesome if I could scan a defun to get all variables that are used in a defun so I can easily put them in the defun. Or remove. So it is easier to manage global variables and local.

[Sen-real]

Thanks for the good idea!