A while ago MATLAB had the function depfile that scanned a function M-file for all the external code the function called. This made it possible to gather all the files needed when you sent someone a function without visually parsing the file yourself. I don't know when it disappeared, but it is not in version 2013a or 2013b.
I looked at menus on the editor, thinking that it might be built in to the editor, but did not see it.
How do I get this functionality back without doing it with my own eyes parsing the code?