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{ lib , . . . } @ flakeArg :
# functions I wrote but didn’ t end up using
# feel free to use them & reference them directly
{
slaacSuffix =
mac :
let
replaceChars = [
" "
" . "
" : "
" - "
] ;
rawMac = builtins . replaceStrings replaceChars ( map ( x : " " ) replaceChars ) ( lib . strings . toLower mac ) ;
invert7bit = {
" 0 " = " 2 " ;
" 1 " = " 3 " ;
" 2 " = " 0 " ;
" 3 " = " 1 " ;
" 4 " = " 6 " ;
" 5 " = " 7 " ;
" 6 " = " 4 " ;
" 7 " = " 5 " ;
" 8 " = " a " ;
" 9 " = " b " ;
" a " = " 8 " ;
" b " = " 9 " ;
" c " = " e " ;
" d " = " f " ;
" e " = " c " ;
" f " = " d " ;
} ;
inherit ( builtins ) substring ;
in
assert builtins . match ( lib . strings . replicate 12 " [ 0 - 9 a - f ] " ) rawMac ;
builtins . concatStringsSep " " [
( substring 0 1 rawMac )
( invert7bit . ${ substring 1 1 rawMac } )
( substring 2 2 rawMac )
" : "
( substring 4 2 rawMac )
" f f : f 0 "
( substring 6 2 rawMac )
" : "
( substring 8 4 rawMac )
] ;
}