#!/usr/bin/fish
#
# Inspired from:
# https://bitbucket.org/denilsonsa/small_scripts/src/default/xsetwacom_my_preferences.sh
#
#

# Configuration

function set_device
    set -g DEVICE "Wacom USB Bamboo PAD Pen stylus"
    set -g DEVICETOUCH "Wacom USB Bamboo PAD Finger touch"
    set -g WACOMPROPTOUCHSPEED "Device Accel Velocity Scaling"
    xsetwacom set "$DEVICE" ResetArea
    set AREATOT (xsetwacom get "$DEVICE" Area)
    set -g AREAX (echo $AREATOT | awk '{print $3}')
    set -g AREAY (echo $AREATOT | awk '{print $4}')
end

function print_help
    echo "This  script configures a Wacom tablet to one  specific monitor,"
    echo "or to the entire desktop. In addition, it also redues the tablet"
    echo "area in order to keep the same aspect ration as the monitor."
    echo
    echo "How to run this script? Run one of the following lines:"
    set CONNECTED_DISPLAYS (xrandr -q --current | sed -n 's/^\([^ ]\+\) connected .*/\1/p')
    set EXEC_NAME (basename (status -f))
    for d in $CONNECTED_DISPLAYS
        echo "    $EXEC_NAME $d"
    end
    echo "    $EXEC_NAME desktop"
    exit
end

function set_screen
    if count $argv > /dev/null
        switch $argv[1]
            case "--help"
                print_help
            case "-h"
                print_help
            case "-help"
                print_help
            case '*'
                set -g SCREEN $argv[1]
        end
    else
        if test (xrandr --listmonitors | grep "HDMI-1")
            set -g SCREEN "HDMI-1"
        else
            print_help
        end
    end
    if [ "$SCREEN" = "desktop" ]
        set -g LINE (xrandr -q --current | sed -n 's/^Screen 0:.*, current \([0-9]\+\) x \([0-9]\+\),.*/\1 \2/p')
    else
        set -g LINE (xrandr -q --current | sed -n "s/^$SCREEN"' connected \([0-9]\+\)x\([0-9]\+\)+.*/\1 \2/p')
    end
    echo $LINE | read WIDTH HEIGHT
    set -g WIDTH $WIDTH
    set -g HEIGHT $HEIGHT
    if test -z $WIDTH || test -z $HEIGHT
        exit 1
    end
end

function adjust_device
    set RATIOAREAY (math ceil \($AREAX \* $HEIGHT \/ $WIDTH\))
    set RATIOAREAX (math ceil \($AREAY \* $WIDTH \/ $HEIGHT\))

    if test $AREAY -gt $RATIOAREAY
        set -g NEWAREAX $AREAX
        set -g NEWAREAY $RATIOAREAY
    else
        set -g NEWAREAX $RATIOAREAX
        set -g NEWAREAY $AREAY
    end

    xsetwacom set "$DEVICE" Area 0 0 $NEWAREAX $NEWAREAY
    xsetwacom set "$DEVICE" MapToOutput "$SCREEN"

    # slow down touchpad
    xinput set-float-prop $DEVICETOUCH $WACOMPROPTOUCHSPEED 0.5

    # slow down scrolling speed
    xsetwacom set $DEVICETOUCH "ScrollDistance" "90"
end

set_device
set_screen
adjust_device