On Thu, 2012-11-08 at 19:18 +0100, Jeroen Roovers wrote:
> For a while I've been thinking that it would be sweet to feed all
> variants (enabled/disabled) of several USE flags to a script to automate
> testing with different USE flag combinations.
>
> USE=" x y"
> USE="-x y"
> USE=" x -y"
> USE="-x -y"
>
> This should be so simple to script but I can't figure out how to do it.
> Anyone have any ideas or a ready example script?
>
>
> jer
>
USE_variable=( foo bar baz )
USE_const=( wombat )
(( n = 0 ))
while (( n < 2**${#USE_variable[@]} )); do
USE=${USE_const[@]}
(( i = 0 ))
while (( i < ${#USE_variable[@]} )); do
if (( n & 2**i )); then
USE+=" ${USE_variable[$i]}"
else
USE+=" -${USE_variable[$i]}"
fi
(( i++ ))
done
(( n++ ))
echo ${USE}
done
# outputs:
# wombat -foo -bar -baz
# wombat foo -bar -baz
# wombat -foo bar -baz
# wombat foo bar -baz
# wombat -foo -bar baz
# wombat foo -bar baz
# wombat -foo bar baz
# wombat foo bar baz
