script to switch input on a dell monitor using ddcutil

ddcutil_switch_input.sh

#!/bin/bash

#################################################
#
# ddcutil detect
# ddcutil --display=2 capabilities
# ddcutil --display=2 getvcp 60
# ddcutil --display=2 setvcp 60 0x0f
#
#################################################

VCP=60

HDMI_1=0x11
HDMI_2=0x12
DP_1=0x0f

#################################################

TARGET_DIS=1
TARGET_INPUT=""

printhelp() {
    echo "USAGE --------------------------"
    echo " --help|-h|-help|help"
    echo "   print help"
    echo ""
    echo " --cur "
    echo "   show current display"
    echo ""
    echo " --dis=* "
    echo "   select display - default 1"
    echo ""
    echo " HDMI1 | hdmi1 | HDMI_1 | hdmi_1 | HDMI2 | hdmi2 | HDMI_2 | hdmi_1 | DP | dp | DP1 | dp1 | dp_1 | DP_1"
    echo "   input to change to"
    echo "----------------------------------------------------------"
}


while [ "$1" != "" ]; do
    case $1 in
        --help|-h|-help|help)
            printhelp
            exit 1
            ;;
        --cur)
            GET_CURRENT_INFO=1
            ;;
        --dis=*)
            TARGET_DIS=$(echo "$1" | sed 's/--dis=//g')
            case $TARGET_DIS in
                1)
                    PLACE_HOLDER=0
                    ;;
                2)
                    PLACE_HOLDER=0
                    ;;
                *)
                    echo "DISPLAY must be 1 or 2"
                    exit 1
            esac
            ;;
        HDMI1|hdmi1|HDMI_1|hdmi_1|HDMI2|hdmi2|HDMI_2|hdmi_1|DP|dp|DP1|dp1|dp_1|DP_1)
            D_VAL="${1^^}"
            case $D_VAL in
                HDMI1|HDMI_1)
                    TARGET_INPUT=$HDMI_1
                    ;;
                HDMI2|HDMI_2)
                    TARGET_INPUT=$HDMI_2
                    ;;
                DP|DP_1|DP1)
                    TARGET_INPUT=$DP_1
                    ;;
                *)
                    echo "ERROR $D_VAL is not one of HDMI1 HDMI2 or DP"
                    exit 1
            esac

            ;;
        *)
            printf "unknown argument! '%s'\n" $1
            printf "   use --help / -h for usage examples\n"
            exit 1
        ;;
    esac
    shift
done

if [ ! -z $GET_CURRENT_INFO ]; then
    echo "ddcutil --display=$TARGET_DIS getvcp $VCP"
    out=$(ddcutil --display=$TARGET_DIS getvcp $VCP)
    INP=$(echo "$out" | sed -n "s/.*(sl=\(.*\))/\1/p")
    echo "$out"
    case $INP in
        $HDMI_1)
            echo "HDMI 1"
            ;;
        $HDMI_2)
            echo "HDMI 2"
            ;;
        $DP_1)
            echo "DP 1"
            ;;
        *)
            echo "unknown $INP"
            ;;
    esac

    exit 1
fi

if [ -z $TARGET_INPUT ]; then
    echo "Need target input - one of HDMI1 HDMI2 DP"
    exit 1
fi

# echo "TARGET_DIS: $TARGET_DIS"
# echo "TARGET_INPUT: $TARGET_INPUT"

##CUR_INPUT=$(ddcutil --display=$TARGET_DIS getvcp $VCP | awk -F'sl=' '{print $2}' | sed 's/)//g')
CUR_INPUT=$(ddcutil --display=$TARGET_DIS getvcp $VCP | sed -n "s/.*(sl=\(.*\))/\1/p")

if [ "$CUR_INPUT" != "$TARGET_INPUT" ]; then
    echo "RUNNING: ddcutil --display=$TARGET_DIS setvcp $VCP $TARGET_INPUT"
    ddcutil --display=$TARGET_DIS setvcp $VCP $TARGET_INPUT
    exit 1
else
    echo "Same input as display doing nothing"
    exit 1
fi

exit 1