Automate build with inotify-tools

Recently I started to work on a new project Backbone Mobile. This will be very modular approach for html5 widgets for mobile web applications. Since it's modular, I wanted to keep all CSS and JavaScript files separated and create "bundle" with "make" command. 

I found it would be great to build it automatically whenever any CSS or JS files are changed for development purposes and I started to look for options. First closest solution is "incron". This is cron-like service which keep track of file system events and execute command whenever binded event is fired by kernel. But it had one downside - no way to track newly created files or track directories recursively. 

Next - I found inotify-tools package available in Ubuntu repositories and installed it:

sudo apt-get install inotify-tools

This package provide tool "inotifywait" which have recursive option! Here is short BASH script I am using to auto-build CSS&JS dependencies for my project:

#!/bin/bash

# get the current path
CURPATH=`pwd`

inotifywait -mqr --timefmt '%d/%m/%y %H:%M' --format '%T %w %f' \
-e close_write ./css ./js | while read date time dir file; do
  ext="${file##*.}"
  if [[ "$ext" = "css" || "$ext" = "js" ]]; then
    FILECHANGE=${dir}${file}
    # convert absolute path to relative
    FILECHANGEREL=`echo "$FILECHANGE" | sed 's_'$CURPATH'/__'`

    echo "At ${time} on ${date}, file $FILECHANGE was changed. Rebuilding."

    # Actual command to execute when CSS or JS file is changed
    make -B
  fi