While working in various source files, (C, Ruby, etc.) I find that I'm often hunting around for functions. Is there a way to have an auto-generated HUD that lists the structure of the current file? It would be fantastic if it linked to different parts of the file, similar to how NERDTree links to different files. Or, similar to the side-navs in the screenshots here: https://stackoverflow.com/questions/16895610/gen-file-missing-incomplete-in-eclipse
Assuming that this doesn't exist as a plugin or something, how do people usually navigate around files like this?