#!/bin/bash
directory=$(pwd)
searchterms="searchterms.txt"
extension=".end"

usage() {
    echo "usage: fmat [[[-f file ] [-d directory ] [-e ext]] | [-h]]"
    echo "  file - text file containing a return-delimited list of materials"
    echo "  directory - directory to process"
    echo "  ext - file extension of files to process"
    echo ""
}

while [ "$1" != "" ]; do
    case $1 in
        -d | --directory )      shift
                                directory=$1
                                ;;
        -f | --file )           shift
                                searchterms=$1
                                ;;
        -e | --extension )      shift
                                extension=$1
                                ;;
        -h | --help )           usage
                                exit
                                ;;
        * )                     usage
                                exit 1
    esac
    shift
done

if [ ! -d "$directory" ]; then
   echo "Sorry, the directory '$directory' does not exist"
   exit 1
fi

if [ ! -f "$searchterms" ]; then
   echo "Sorry, the searchterms file '$searchterms' does not exist"
   exit 1
fi

echo "Searching '$directory' ..."
for file in "${directory}/*"; do
    printf "File: %sn" ${file}
    [ -e "$file" ] || continue
    printf "%sn" ${file}
    if [ ${file: -3} == ${extension} ]; then
        printf "%s will be processedn" ${file}
        #
        # lots of processing here
        #
    fi
done

grep -f searchterms.txt *.end > allchanges.end.res