watch-exec

#!/usr/bin/env bash
if [[ -z $2 ]]; then
  echo "Usage: $0 [path-to-watch] [command-to-execute]" && exit 255
fi


sha=0
update_sha() {
  sha=`ls -lR --time-style=full-iso $1 | sha1sum`
}
update_sha
previous_sha=$sha
compare() {
  update_sha "$1"
  if [[ "$sha" != "$previous_sha" ]] ; then
    echo -n "sync..."
    $1
    previous_sha=$sha
  else
    echo -n .
  fi
}
trap build SIGINT
trap exit SIGQUIT

echo -e  "--> Press Ctrl+C to force build, Ctrl+\\ to exit."
echo -en "--> watching."
while true; do
  compare "$2"
  sleep 1
done