Customized grep of specific filetypes (defaults to python)

mygrep.sh

#!/bin/bash

flags=""
extension="py"
search_term=""
verbose=""

help_str="\n\tmygrep [-f|--flags flags] [-v|--verbose] [-x|--ext extension]\n"

if [ $# -eq 0 ]; then
    echo -e $help_str
    exit 0
fi

while test $# -gt 0; do
    case "$1" in
        -h|--help )
            echo -e $help_str 
            exit 0 
        ;;  
        -f|--flags )
            flags="-$2"
            shift 2 
        ;;  
        -x|--ext )
            extension=$2
            shift 2 
        ;;  
        -v|--verbose )
            verbose='true'
            shift
        ;;  
        *)  
            search_term="$1"
            shift 
        ;;  
    esac
done

grep_cmd="grep $flags \"$search_term\" "
find_cmd="find . -name \*.$extension" 

eval $grep_cmd $(eval $find_cmd)