Script run make in current folder if files of specific type are changed

watch-rebuild.sh

#!/bin/bash                                                                                                           

usage() {
cat <<EOF
usage: $(basename $0) [OPTIONS]

        This script run make in folder 
        if file of specific type is changed

OPTIONS:
        -h -- show this message
        -p path -- path to monitor
        -b build -- build option
        -e exts -- etensions, e.g. js coffee html

EOF
}

div() {
   local columns=$(($(tput cols) - 8))
   local line=$(printf '%0.1s' "-"{1..500})
   printf "\e[01;31m---- 8< ${line:0:${columns}}\e[0m\n"
}
contains() {
        local e
        for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done
        return 1
}

# get the current path
CURPATH=`pwd`

EXTS=('css' 'coffee' 'html')
MPATH="."
BUILDARG=""

while getopts "hp:b:e:" OPTION
do
        case $OPTION in
                h)
                        usage
                        exit 1
                        ;;
                p) 
                        MPATH=$OPTARG
                        ;;
                b)
                        BUILDARG=$OPTARG
                        ;;
                e) 
                        EXTS=$OPTARG
                        ;;
        esac
done

inotifywait -mqr --timefmt '%d/%m/%y %H:%M' --format '%T %w %f' -e close_write,modify $MPATH | 
while read date time dir file; do
  ext="${file##*.}"
  if contains $ext ${EXTS[@]}; then
    FILECHANGE=${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
    div
    make $BUILDARG
  fi
done