Switch external display input with m1ddc

toggle-display.sh

#!/bin/bash

function choose_from_menu() {
    local prompt="$1" outvar="$2"
    shift
    shift
    local options=("$@") cur=0 count=${#options[@]} index=0
    local esc=$(echo -en "\033") # cache ESC as test doesn't allow esc codes
    printf "$prompt\n"
    while true
    do
        # list all options (option list is zero-based)
        index=0 
        for o in "${options[@]}"
        do
            if [ "$index" == "$cur" ]
            then echo -e " >\033[7m$o\033[0m" # mark & highlight the current option
            else echo "  $o"
            fi
            (( index++ ))
        done
        read -s -n3 key # wait for user to key in arrows or ENTER
        if [[ $key == $esc[A ]] # up arrow
        then (( cur-- )); (( cur < 0 )) && (( cur = 0 ))
        elif [[ $key == $esc[B ]] # down arrow
        then (( cur++ )); (( cur >= count )) && (( cur = count - 1 ))
        elif [[ $key == "" ]] # nothing, i.e the read delimiter - ENTER
        then break
        fi
        echo -en "\033[${count}A" # go up to the beginning to re-render
    done
    # export the selection to the requested output variable
    printf -v $outvar "${options[$cur]}"
}

selections=(
    "hdmi"
    "display port"
    "usb-c"
)

choose_from_menu "Please make a choice:" selected_choice "${selections[@]}"
echo "Using m1ddc to select: $selected_choice"

case $selected_choice in

  "hdmi")
    m1ddc display 2 set input 17
    ;;

  "display port")
    m1ddc display 2 set input 15
    ;;

  "usb-c")
    m1ddc display 2 set input 27
    ;;

  *)
    echo -n "unknown"
    ;;
esac

https://github.com/waydabber/m1ddc