auto-rotate

#!/bin/sh

#
# auto-rotate the screen and pointers
# copyright 2018 Don Bowman (db@donbowman.ca)
# Licensed under Apache License, Version 2.0

DISPLAY=:0
export DISPLAY

install_background() {

    export BACKDROP=~/.config/auto-rotate/${1}.jpg
    if [ -f "$BACKDROP" ]
    then
cat << EOF | sh
    dbus-send --session --dest=org.kde.plasmashell --type=method_call /PlasmaShell org.kde.PlasmaShell.evaluateScript 'string:
    var Desktops = desktops();
    for (i=0;i<Desktops.length;i++) {
            d = Desktops[i];
            d.wallpaperPlugin = "org.kde.image";
            d.currentConfigGroup = Array("Wallpaper",
                                        "org.kde.image",
                                        "General");
            d.writeConfig("Image", "file://$BACKDROP");
    }'
EOF
    fi

}

rotate_cursor() {
    pointers=$(xinput list | mawk -W interactive '/Virtual core pointer/ { printing=1 } /Virtual core keyboard/ { printing=0} { if (printing && (match($0, /ELAN/) || match($0, /Pen/) || match($0, /Finger/) || match($0, /Touch/) )) { gsub(".*id=",""); print $1 } }')
    echo "rotate -- pointers: <<$pointers>> matrix: <<$*>>"
    for p in $pointers
    do
        xinput set-prop "$p" "Coordinate Transformation Matrix" "$@"
    done
}

remove_keyboard(){
    keyboard=$(xinput list | mawk -W interactive '/Virtual core pointer/ { printing=0 } /Virtual core keyboard/ { printing=1} { if (printing && (match($0, /AT Translated Set 2 keyboard/))) { gsub(".*id=",""); print $1 } }')
    xinput ${1} $keyboard
    echo Keyboard ${1}"d"
}


MAIN_SCREEN=$(xrandr --current | grep connected | mawk -W interactive '/primary/ {print $1}')
echo "$MAIN_SCREEN"
monitor-sensor | mawk -W interactive '/Accelerometer orientation changed:/ { print $NF; fflush();}' | while read -r line
do
    echo "$line"
    # If we have external monitor connected, do not rotate
    nscreens=$(xrandr  | grep -c " connected")
    if [ "$nscreens" != 1 ]
    then
        line=normal
    fi

    # Set the actions to be taken for each possible orientation
    case "$line" in
        normal)
            # re-enable backlight
            dbus-send --print-reply=literal --type=method_call --system --dest=org.freedesktop.UPower /org/freedesktop/UPower/KbdBacklight org.freedesktop.UPower.KbdBacklight.SetBrightness int32:1
            remove_keyboard enable
            xrandr --output "$MAIN_SCREEN" --rotate normal
            rotate_cursor 1 0 0 0 1 0 0 0 1
            install_background normal
            ;;
        bottom-up)
            # disable backlight
            dbus-send --print-reply=literal --type=method_call --system --dest=org.freedesktop.UPower /org/freedesktop/UPower/KbdBacklight org.freedesktop.UPower.KbdBacklight.SetBrightness int32:0
            remove_keyboard disable
            xrandr --output "$MAIN_SCREEN" --rotate inverted
            rotate_cursor -1 0 1 0 -1 1 0 0 1
            install_background bottom-up
            ;;
        right-up)
            # disable backlight
            dbus-send --print-reply=literal --type=method_call --system --dest=org.freedesktop.UPower /org/freedesktop/UPower/KbdBacklight org.freedesktop.UPower.KbdBacklight.SetBrightness int32:0
            remove_keyboard disable
            xrandr --output "$MAIN_SCREEN" --rotate right
            rotate_cursor 0 1 0 -1 0 1 0 0 1
            install_background right-up
            ;;
        left-up)
            # disable backlight
            dbus-send --print-reply=literal --type=method_call --system --dest=org.freedesktop.UPower /org/freedesktop/UPower/KbdBacklight org.freedesktop.UPower.KbdBacklight.SetBrightness int32:0
            remove_keyboard disable
            xrandr --output "$MAIN_SCREEN" --rotate left
            rotate_cursor 0 -1 1 1 0 0 0 0 1
            install_background left-up
            ;;
    esac
done
exit 0