Tree view of categories and subcategories

folder pkgsrc
        |- folder wip
        |- folder net
        |- folder audio
        |- folder mail
        |- folder wm
        |- folder www
        |- folder geography
        |- folder benchmarks
        |- folder devel
        |- folder news
        |- folder textproc
        |- folder math
        |- folder chat
        |- folder japanese
        |- folder graphics
        |- folder x11
        |- folder converters
        |- folder lang
        |- folder security
        |- folder databases
        |- folder ham
        |- folder perl5
        |- folder tk
        |- folder meta-pkgs
        |- folder sysutils
        |- folder python
        |- folder multimedia
        |- folder misc
        |- folder games
        |- folder cross
        |- folder fonts
        |- folder print
        |- folder comms
        |- folder time
        |- folder ruby
        |- folder gnome
        |- folder kde
        |- folder emulators
        |- folder editors
        |- folder linux
        |- folder biology
        |- folder pkgtools
        |- folder doc
        |- folder cad
        |- folder regress
        |- folder finance
        |- folder crosspkgtools
        |- folder archivers
        |- folder plan9
        |- folder xmms
        |- folder filesystems
        |- folder tcl
        |- folder shells
        |- folder inputmethod
        |- folder chinese
        |- folder korean
        |- folder parallel
        |- folder mbone
        |- folder drivers
        |- folder scm
        |- folder gnustep
        |- folder database
        |- folder local
        |- folder sound
        |- folder science
        |- folder astronomy
        |- folder physics
        |- folder wwww
        |- folder physcis
        |- folder textoproc
        \- folder java