Lua script to set id3 tags on mp3 files

["uGAH man!" <devotion@...>]

   Hi.
   I would like to use lua to automatically set id3 tags on my music files.
   The example usage would be:

ike:~/downloads/media/rooney - 2003 - rooney> ls
INCOMPLETE~albumartsmall.jpg                               rooney - 05 - 
popstars.mp3
INCOMPLETE~folder.jpg                                      rooney - 06 - 
i'm shakin'.mp3
albumart_{1caae637-9f50-4e4b-b87d-9a67e946d5ae}_large.jpg  rooney - 07 - 
daisy duke.mp3
albumartsmall.jpg                                          rooney - 08 - 
sorry sorry.mp3
rooney - 01 - blueside.mp3                                 rooney - 09 - 
that girl has love.mp3
rooney - 02 - stay away.mp3                                rooney - 10 - 
simply because.mp3
rooney - 03 - if it were up to me.mp3                      rooney - 11 - 
losing all control.mp3
rooney - 04 - terrible person.mp3

ike:~/downloads/media/rooney - 2003 - rooney> lua -f myscript.lua *.mp3 
"stringidentifyingthefilenameformat"

   The filename format string would inform that the filename is of 
format ARTIST - TRACKNR - TITLE.mp3.
   Is there any easy way to do this ? Should i use string.gsub/gfind ?
   I use the mp3info util to set id3 tag fields, that is covered. It 
contains an easy way to specify these fields through the command line.
   Thank you.
   -- Fred