xinput-setup-touchpad.sh

#!/bin/sh

set -eu

tpid=0

for id in $(xinput list --id-only)
do
   if xinput list-props $id | grep -q "^Device 'SynPS/2 Synaptics TouchPad':"
   then
      tpid=$id
      break
   fi
done

if [ $tpid -eq 0 ]
then
   logger -t $0 no touchpad found...
   exit 1
fi

get_prop_id() {
   echo "$1" | cut -d'(' -f2 | cut -d')' -f1
}

get_prop() {
   xinput list-props $tpid | grep "$1 (" | cut -d'(' -f2 | cut -d')' -f1
}

x() {
   echo "$@"
   eval "$@"
}

set_prop() {
   x xinput set-prop $tpid $1 $2
}

set_prop $(get_prop "libinput Tapping Enabled") 1
set_prop $(get_prop "libinput Natural Scrolling Enabled") 1
set_prop $(get_prop "libinput Middle Emulation Enabled") 1
set_prop $(get_prop "libinput Accel Speed") 0.85