RE: Best way to get hang of an elisp file?

[Drew Adams]

> > I'm curious whether there exists something like "outline mode",
> > hiding everything but the signature of a function and its docstring
> > etc.
> 
> Yes, it's called outline-minor-mode ;-) For Elisp, I additionally use:
>
> (add-hook 'outline-minor-mode-hook
>           (lambda () (when (and outline-minor-mode
>                                 (derived-mode-p 'emacs-lisp-mode))
>             (hide-sublevels 1000))))
>
> which starts outline-minor-mode by hiding all the bodies of
> functions.  I also use `reveal-mode' which automatically unhides...

Good reminder.  `outline-minor-mode' and `reveal-mode' are oldies but
goodies.

Not a complete answer here, though, since `o-m-mode' hides also the
doc strings.  (And even part of the signature, if it ends on another
line.)