Emacs comes with elisp scripts to do just that as well as similar things. You can arbitrarily collapse function bodies using a simple command sequence. Additionally, if you know elisp (I won't pretend that I do), you can really do anything. For example, if you decided that you wanted to collapse every third recursion of braces, it's a very short elisp script. In your case, I would throw some boundary separators around the block you want to hide. In fact, braces would be fine for this. Additionally, if you find yourself using common code among several programs that you decide that you are not interested in, separate it into a separate library. Even within your program, you should separate your operations into functions for clarity. Except for me, most programmers I know like to have main functions no longer than twenty lines. That should help you clean up.
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