Toggle input source of Dell U2715H (or other i2c enabled monitors) from keyboard shortcut

toggleinput.sh

#!/bin/bash

#sudo cp toggleinput.sh /usr/local/bin/toggleinput
#chmod 755
#chown root:root
#set as keyboard shotcut target

#elevate to root if necessary
if test "$(id -u)" -ne 0 ; then
    sudo "$0" "$1"
    exit $?
fi

#probe input menu over i2c
inputid=$(ddccontrol -r 0x60 dev:/dev/i2c-0 | tail -1 | cut -d'/' -f 2)

echo "Input is "$inputid

if test $inputid -ne 15 ; then
    ddccontrol -r 0x60 -w 15 dev:/dev/i2c-0 #mDP
    exit 1
else 
    ddccontrol -r 0x60 -w 17 dev:/dev/i2c-0 #hdmi1
    exit 1
fi