#!/bin/sh
#
# A small script for running a command whenever the specified files (or
# any file in the current directory) changes.
#
# Requires the inotifywait command which is part of inotify-tools.
#
# By Ted Percival <ted@midg3t.net> (2007)
# Hereby dedicated to the public domain:
# http://creativecommons.org/licenses/publicdomain/
#

set -e

[ $# -gt 0 ] || exit 1

CMD=$1
shift

[ $# -eq 0 ] && set -- `pwd`

# I'm not sure if these are all necessary, but the way vim writes files
# requires that some kind of delete event be checked for.
EVENTFLAGS="-e modify -e close_write -e delete -e delete_self -e create"

run_cmd () {
  set +e
  $CMD
  ret=$?
  set -e
  echo
  if [ $ret -eq 0 ]; then
    echo Command succeeded.
  else
    echo Command returned $ret.
  fi
  # Make sure the editor has time to put the files back
  # I know this is bogus, but it seems to help.
  sleep 1
  return 0
}

# Run once to start with
run_cmd

while inotifywait -qq $EVENTFLAGS "$@"; do
  run_cmd
done

exit 0
# vim: ts=2 sw=2 et tw=72 syntax=sh ai