[PLUG] fold output of 'tree' with 'vim'?

[Randall A Sindlinger <rsindlin+plug@seas.upenn.edu>]

Hi all,

I've googled for this a couple of times, but not been able to find the answer
I want - so maybe I'm just trying to do it wrong.

I'd like to be able to take a file directory structure, eg, the kind of output
you can get with 'tree -if' [1], and view it in such a way that I can collapse the
directories.  I know there are file browsers all over the place that do this,
by clicking on the little + or - beside the directory name.  

_But_ I want one that doesn't need to work on the live filesystem; rather, instead 
just work on an input file.  It *seems* like vim should be able to do this
for me by using it's folding feature, but I've not had any luck.

Any suggestions?

Thanks,
-Randall

[1] Example output from 'tree -if'

./meta-base-seas
./meta-base-seas/base-addons
./meta-base-seas/base-addons--packages-not-found
./meta-base-seas/base-addons--packages-processed
./meta-base-seas/base-addons--packages-seen
./meta-base-seas/base-addons--too-many-results
./meta-base-seas/base-addons.r2r.err
./meta-base-seas/base-addons.r2r.out
./meta-base-seas/renamed-pkgs
./meta-base-seas/renamed-pkgs.names
./meta-base-seas/renamed-pkgs.names--packages-processed
./meta-base-seas/renamed-pkgs.names--packages-seen
./meta-base-seas/rpms-for-vetting
./meta-software-SUSE
./meta-software-SUSE/rpm-for-vetting.2nd-round.err
./meta-software-SUSE/rpm-for-vetting.err
./meta-software-SUSE/rpms-for-vetting
./meta-software-SUSE/rpms-for-vetting.2nd-round
./meta-software-SUSE/zypper-kde+gnome
./meta-software-SUSE/zypper-kde+gnome--packages-processed
./meta-software-SUSE/zypper-kde+gnome--packages-seen
./meta-software-SUSE/zypper-kde+gnome--too-many-results
./meta-software-SUSE/zypper-kde+gnome.r2r.err
./meta-software-SUSE/zypper-kde+gnome.r2r.out
./meta-software-seas
./meta-software-seas/rpms-for-vetting
./meta-software-seas/software-addons
./meta-software-seas/software-addons--packages-not-found
./meta-software-seas/software-addons--packages-processed
./meta-software-seas/software-addons--packages-seen
./meta-software-seas/software-addons--too-many-results
./meta-software-seas/software-addons.r2r.err
./meta-software-seas/software-addons.r2r.out
./test-refs
./test-refs/freeze.1.test
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