#!/bin/bash

if [ ! "$(pwd | grep scripts$)" ] ; then
    echo "Working directory is wrong"
    exit 1;
fi

BASE_PATH=`pwd | xargs dirname`

folder=$1 
if [ "$folder" == "" ] ; then
    folder=$BASE_PATH
fi

echo 'Cleaninig BOM markers from ' $folder

#expand the char codes in the regex to their corresponding characters 
regex1=$'\xEF\xBB\xBF'
cmd1="grep -rl $regex1 $folder"
#select only php, ini, html, and js files
regex2='\.\(php\|ini\|html\|js\)$'
cmd2="grep $regex2"

files=$($cmd1 | $cmd2)
if [ "$files" == "" ] ; then
    echo 'All files already cleaned up';
    exit;
fi
echo "Cleaning up:"
echo "$files" | \
    while read f; do
        echo '    ' $f;
        # back up file; only if not yet backed up
        backup="$f.backup"
        if [ ! -e "$backup" ]; then
            cp "$f" "$backup"
        fi
        # the copy operation above could have failed anyway (permissions)
        # don't proceed if there is no backup file
        if [ -e "$backup" ]; then
            # delete the original file
            rm -f "$f"
            # output the backup file without the BOM 
            # and write it to the original file location
            sed "s/\xEF\xBB\xBF//" "$backup" > "$f"
            rm -f "$backup"
        fi
    done