#!/bin/bash

if [ "$DISPLAY" = ":0.0" ]; then
  OTHERDISP=":1.0"
else
  OTHERDISP=":0.0"
fi

TMP="/tmp/xclip.$$"
CLIP="${TMP}.${DISPLAY}"
MINE="${TMP}.${OTHERDISP}"
LOCK="/tmp/xclip.lock"

while :; do
  if ! lock -f $LOCK -t 20; then
    echo "LOCKFILE HELD LONG TIME"
  else
    xclip -out -display $OTHERDISP > ${CLIP}
    if ! diff -q $CLIP $MINE > /dev/null 2>&1; then
      echo "Clipboard on $OTHERDISP different"
      cp ${CLIP} ${MINE}
      xclip -in < ${MINE}
    fi
    rm $LOCK
  fi
  sleep 1
done