Scan folder for changes in files by checking mod timestamp. If change is detacted, the changed files is touched. It's handy for sync systems which doesn't notify on file changes.

watcher.sh

#!/bin/bash

# Scan folder for changes in files by checking mod timestamp. If change is detacted, the changed files is touched

if [ -z $1 ]; then
  echo "folder has to be provided"
  exit
fi

FOLDER=$1

declare -A RECENT
declare -A CURRENT

get_files () {
  local files
  local -n result=$1
  readarray -d '' files < <(find "${FOLDER}" -type f -not -path "*/node_modules/*" -not -path "*/.nvm/*" -not -path "*/.expo/*" -not -path "*/.git/*" -not -path "*/.gradle/*" -not -path "*/.idea/*" -print0)

  for key in "${files[@]}"
  do
    result["${key}"]=`date +%s -r ${key}`
  done
}

get_files RECENT

while true; do
  sleep 1

  get_files CURRENT

  for key in "${!CURRENT[@]}"; do
    if [ -z ${RECENT["${key}"]} ] || [[ ${RECENT["${key}"]} < ${CURRENT["${key}"]} ]]; then
      echo "touch ${key}"
      touch "${key}"
      RECENT["${key}"]=`date +%s -r ${key}`
    fi
  done
done