[gentoo-dev] USE flag swiss army knife

[Michael Thompson]

I whipped up this script a while back for personal use, but didn't clean it up 
enough for public consumption until now.  My girlfriend has been bugging me 
to do this, and I never heard from Bob Phan about whether or not he was going 
to make a command-line version of his nice GUI USE generator (don't want to 
step on anyone's toes), so here is a tool/flamebait for you to check out and 
comment on:

usetookit is a bash script that provides several functions:
ushow - lists the contents of your USE variable
udesc - lists descriptions for one of more USE variables
uadd - add a USE flag (enabled or disabled) to your USE variable
urm - remove a USE flag from your USE variable
use-update - an etc-update-like utility that will interactively remove 
depreciated USE flags, then interactively add new USE flags, based on 
use.desc.  It keeps a cache of the contents of use.desc so that it will not 
keep bugging you every time you run it about new USE flags that you chose not 
to put in your USE variable.

To use this tool, place it in root's path, then create symlinks to the 
functions you want to use:
e.g.
# ln -s usetoolkit use-update
Run usetoolkit by itself to get help.

Please keep in mind that my bash skills are practically non-existant, but that 
this tool works (for me at least) and doesn't have any bugs that I know of.  
Nevertheless, back up your make.conf before trying this.

Yes, I know the code is ugly and horribly inefficient.  Please let me know 
what else you think about it.

-- Michael Thompson