wacommap

#!/bin/bash

# WacomDisplayMap
# Easily map a Wacom graphics tablet to a display,
# without having to muck through a bunch of device lists.
#
# AUTHOR(S): Jason C. McDonald
# VERSION: 1.0
# GITHUB: https://github.com/CodeMouse92/WacomDisplayMap

# Copyright (c) 2017 Jason C. McDonald.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the <organization> nor the
#       names of its contributors may be used to endorse or promote products
#       derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#Isolate the id of the stylus and eraser devices automatically.
rawID1=`xsetwacom --list | pcregrep -M 'STYLUS' | pcregrep -o 'id\: \d*'`
rawID2=`xsetwacom --list | pcregrep -M 'ERASER' | pcregrep -o 'id\: \d*'`
#Trim further
device1=`echo "$rawID1" | grep -o "[0-9]\+"`
device2=`echo "$rawID2" | grep -o "[0-9]\+"`

if [[ -z "$device1" && -z "$device2" ]]
then
    echo "No Wacom stylus or eraser detected."
    exit 0
fi

# Use xrandr to parse out the valid display names.
output=`xrandr | pcregrep -M '\bconnected' | pcregrep -o '^[^ ]+'`
# Store the display names in an array.
IFS=$'\n' read -rd '' -a displays <<< "$output"
# Get the number of valid displays
displaycount=${#displays[@]}

# Print all display options nicely.
echo "The following displays were detected:"
for index in ${!displays[@]}
do
    num=$((index+1))
    echo "$num: ${displays[index]}"
done

if [[ $displaycount -eq 1 ]]
then
    echo "Automatically selecting ${displays[0]}."
    display=${displays[0]}
else
    while true
    do
        read -p "Your selected display number? " answer

        case $answer in
        [1-${displaycount}])
            # Offset to 0-based index again.
            answer=$((answer-1))
            display=${displays[answer]}
            break
            ;;
        *)
            echo "Invalid selection."
            ;;
        esac
    done
fi

# Map the devices to the selected display
if [ -n "$device1" ]
then
    echo "Mapping Wacom Stylus to display ${display}..."
    xsetwacom --set $device1 MapToOutput ${display}
fi

if [ -n "$device2" ]
then
    echo "Mapping Wacom Eraser to display ${display}..."
    xsetwacom --set $device2 MapToOutput ${display}
fi

echo "Happy drawing!"