monitor a directory tree with inotifywait, repeat a command when anything in the tree changes

repeat-command-while-dir-changes.bash

#!/bin/bash

WATCH_DIR="app/"
REPEAT_ON_CHANGES="./node_modules/.bin/webpack --progress"

inotifywait -m --exclude '\..*.swp' -e MODIFY -r $WATCH_DIR | \
while true
do 
  sleep 0.1
  (e=false; while read -t 0.1 d; do echo $d; export e=true ; done; $e) \
    && $REPEAT_ON_CHANGES
done