"Focus mode" plugin that only shows one function in a buffer?

Is there a plugin or way for me to just display and edit a single function in a buffer? I'm been using MacVim for a few years now and have been mostly working with ObjC, Python and Ruby which all has the concept of a function. Lately I've been yearning for a way (from my Smalltalk roots[1]) to just view and edit just a single function in a buffer, a sort of reverse-folding.

Is there a way to achieve this? Thanks

[1] For those familiar with Smalltalk, when you click on a method in a Smalltalk browser, the code panel only shows the source of that particular method.


—
Hwee-Boon
http://hboon.com

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