Display switcher for udev

#!/bin/bash

# Desktop modes
declare -A attach
attach[5]='0x1b'
attach[8]='0x0f'

declare -A detach
detach[5]='0x0f'
detach[8]='0x11'

wait_time=1
wait_counter=10

case $ACTION in
        add)
                for key in $(echo "${!attach[@]}" | xargs -n1 | sort -g)
                do
                        counter=0
                        while [[ $counter -lt $wait_counter ]]
                        do
                                counter=$((counter+1))
                                if [[ -c "/dev/i2c-${key}" ]]
                                then
                                        ddcutil setvcp --bus $key 60 ${attach[$key]}
                                        break
                                fi
                                sleep $wait_time
                        done
                done
                ;;
        remove)
                for key in $(echo "${!detach[@]}" | xargs -n1 | sort -g -r)
                do
                        counter=0
                        while [[ $counter -lt $wait_counter ]]
                        do
                                counter=$((counter+1))
                                if [[ -c "/dev/i2c-${key}" ]]
                                then
                                        ddcutil setvcp --bus $key 60 ${detach[$key]}
                                        break
                                fi
                                sleep $wait_time
                        done
                done
                ;;
esac