touchpad-on-off

#!/bin/bash

function get_id
{
        idstr=$(xinput -list | grep "PS/2 Generic Mouse")
        # idstr now contains something like "⎜ ↳ PS/2 Generic Mouse id=13 [slave pointer (2)]"

        # split it into different tokens
        # e.i. "Mouse", "id=13", ...
        # http://stackoverflow.com/questions/918886/how-do-i-split-a-string-on-a-delimiter-in-bash/5257398#5257398
        arr=(${idstr// / })

        for token in "${arr[@]}"
        do
                words=(${token//=/ })
                if [ ${#words[@]} -eq 2 ]; then
                        if [ "${words[0]}" = "id" ]; then
                                id=${words[1]}
                        fi
                fi
        done
}

function change_state
{
        state=$(xinput -list $id | grep "disabled")

        if [[ $state ]]
        then
                xinput set-prop $id "Device Enabled" 1
        else
                xinput set-prop $id "Device Enabled" 0
        fi
}

get_id
if [[ $id ]]; then
        change_state
fi