multiple pointers/keyboards on xserver for pair programming

pair-up.sh

#!/bin/bash
set -eu

function getPairIds {
  xinput test-xi2 --root | awk '
    BEGIN{FS="[()]"} 
    /EVENT.*KeyPress[)]/ {key=1} 
    /EVENT.*ButtonPress[)]/ {mouse=1}
    key && /device: / {kId=$2;key=0}
    mouse && /device: / {mId=$2;mouse=0}
    kId && mId { print kId "," mId; exit }    
  '
}

function getMasterId {
  xinput list "$1" | awk 'match($0,/id=([0-9]*)/,g) {print g[1];exit}'
}

echo "Press button on keyboard and mouse pair: "
ids=$(getPairIds)

xinput create-master pair

pairKeyboard=$(getMasterId "pair keyboard")
pairPointer=$(getMasterId "pair pointer")

keyId=$(echo $ids|cut -d, -f1)
mouseId=$(echo $ids|cut -d, -f2)
xinput reattach $keyId $pairKeyboard
xinput reattach $mouseId $pairPointer

echo "Unpair with: "
echo "xinput reattach $keyId $(getMasterId 'Virtual core keyboard'); xinput reattach $mouseId $(getMasterId 'Virtual core pointer'); xinput remove-master $(getMasterId 'pair pointer')"