erlswitch

erlswitch

#!/usr/bin/env bash
# -*- mode: sh -*-

old=$(ls -l /usr/local/lib/erlang | awk '{print $11}')
others=$(ls -ld /usr/local/lib/erlang* | awk '{print $9}' | grep -v "^/usr/local/lib/erlang$")
default=${old}

declare -a arry

cat <<EOF

Select an Erlang version to be the next active version
Currently active: ${old}

EOF
counter=1
for i in $others
{
printf "\t%d) %s\n" $counter $i
arry[$counter]=$i
counter=$(expr $counter + 1)
}

# echo "OTHER[2]: ${arry[2]}"
echo
read -p "Select the new version or return for [${default}]: " answer

case ${answer} in
    "")
        answer=$default
	;;
    1|2|3|4|5|6|7|8|9|10)
	# echo "Number ${answer} selected"
	answer=${arry[$answer]}
	;;
    *)
        printf "\nYou did not choose a valid item.\nNothing has been changed.\n\n"
        ;;
esac

rm /usr/local/lib/erlang
ln -s ${answer} /usr/local/lib/erlang

printf "\nActivated Erlang version '${answer}'.\n\n"