watch.bash

#!/usr/bin/env bash

if [[ $# < 2 ]]; then
  echo -e Usage: watch.bash \<directory\> \<command\> \[\<argument placement\>\] \[\<extra arguments\>\]
  echo -e ' \t ' \<argument placement\> can be either "first" or "second"
  echo -e ' \t\t '     first: the changed file goes before the \<extra arguments\>
  echo -e ' \t\t '    second: the changed file goes fater the \<extra arguments\>
  echo -e ' \t\t '    \<argument placement\> defaults to "first"
  exit
fi

shopt -s extglob
targetdir=${1%%+(/)}

cmd=$2

mode=${3:-"second"}
if [ "$mode" = "first" ] || [ "$mode" = "second" ]; then
  shift
else
mode="first"
fi
shift
shift

echo Monitoring $targetdir
while true; do
  pushd $targetdir >/dev/null
  change=$(inotifywait -q -e close_write,moved_to,create .)
  change="$targetdir/${change#./ * }"
  echo FULL PATH $change
  echo RELPATH $change
  change=`python -c "import os,sys;print(os.path.relpath(sys.argv[1],os.getcwd()))" "$change"`
  popd >/dev/null
  if [ "$mode" = "second" ]; then
    $cmd $@ "$change"
  else
    $cmd "$change" $@
  fi
done