palmreject.sh

#!/bin/bash
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# configuration. run "xinput list" to see ids for your devices.
touchscreen_device_name='NTRG0001'
stylus_device_specifier='stylus'
disable_timeout=1

# code follows. only change this if you know what you are doing.

# find out device ids from xinput:
touchscreen_device=`xinput --list | grep -v "Pen" | grep $touchscreen_device_name | grep -Po '(?<=id\=)[0-9]+'`
echo Touchscreen ID'='$touchscreen_device
stylus_device=`xinput --list | grep $stylus_device_specifier | grep -Po '(?<=id\=)[0-9]+'`

#Deprecated from original script
#stylus_device=`xinput --list | grep $stylus_device_name | grep $stylus_device_specifier | head -n 1 | grep -Po '(?<=id\=)[0-9]+'`

#prelimenary loop - some stylus does not appear until used
while [ -z "$stylus_device" ]
do
  echo "Pen not found"
  stylus_device=`xinput --list | grep $stylus_device_specifier | grep -Po '(?<=id\=)[0-9]+'`
  sleep 2
done

echo "Stylus ID=$stylus_device"

last_state=-1
timer=0

# main loop:
while [ 1 ]
do
  state=`xinput query-state "$stylus_device" | grep -c "ValuatorClass Mode=Absolute Proximity=In"`

  if [ "$state" -ne "$last_state" ] || [ "$timer" -lt $((disable_timeout+1)) ];then
    if [ "$state" -ne 0 ];then
      echo "Disabling touchscreen, device $touchscreen_device"
      timer=$((disable_timeout+1))
      xinput --disable $touchscreen_device
    elif [ "$timer" -eq $((disable_timeout+1)) ]; then
      timer=0
    elif [ "$timer" -lt "$disable_timeout" ]; then
      timer=$((timer+1))
    else
      echo "Enabling touchscreen, device $touchscreen_device"
      timer=$((disable_timeout+1))
      xinput --enable $touchscreen_device
    fi
  fi
  last_state=$state
  sleep 0.3
done