DDC via lunar on macOS to toggle monitors between Mac and Windows.

lunar-switch.sh

#!/bin/bash
# lunar ddc <monitorID> 0x60 read to identify value of the monitor. Update serial number of monitor accordingly
lunar_switch() {
    local LUNAR="/Users/sean/.local/bin/lunar"

    _toggle_monitor() {
        local ID=$1
        # We check the display list including disconnected ones
        # We use 'lunar displays' to see if the ID exists in any stateĀ
        local STATE=$($LUNAR ddc $ID 0x60 read)

        if [ "$STATE" -eq 4 ]; then
            echo "Monitor $ID: Returning to Mac..."
            $LUNAR connect $ID
            sleep 2
            $LUNAR ddc $ID 0x60 3
        else
            echo "Monitor $ID: Switching to Windows..."
            $LUNAR disconnect $ID
            sleep 2
            $LUNAR ddc $ID 0x60 4
        fi
    }

    case "$1" in
        1) _toggle_monitor 3DCC4033-D862-480F-9F40-DE36F70A3C61;;
	    2) _toggle_monitor 50500ABB-E757-4C77-80A1-1969AB721D00;;
        all)
            echo "Toggling all monitors..."
            _toggle_monitor 3DCC4033-D862-480F-9F40-DE36F70A3C61 &
            _toggle_monitor 50500ABB-E757-4C77-80A1-1969AB721D00 &
            wait
            ;;
        *)
            echo "Usage: lunar_switch {1|2|all}"
            return 1
            ;;
    esac
}

# Only execute if run directly (not sourced)
if [[ "${BASH_SOURCE[0]}" == "${0}" ]] || [[ "$ZSH_EVAL_CONTEXT" == "toplevel" ]]; then
    lunar_switch "$@"
fi