#!/bin/sh
internal_path="$(echo $PATH | sed -e 's/:/\n/g')"

while true; do
    if getopts "ac:h" arg; then
        true # do nothing
    else
        break
    fi
    case $arg in
        a)
            all="yes"
            shift
            ;;
        c)
            internal_path="$(echo $OPTARG | sed -e 's/:/\n/g')"
            shift 2
            ;;
        h)
            echo "Usage: $0 [-a] [-c <custom path>] <command>"
            echo \
'Options:
 -a return all results if multiple found
 -c <custom path> search in the specified path instead of $PATH
 -h display this message'
            echo \
"Exit codes:
 0 found
 1 not found
 2 error"
            exit 0
            ;;
        ?)
            echo "Usage: $0 [-a] [-c <custom path>] <command>"
            exit 2
            ;;
    esac
done

IFS='
'
for directory in $internal_path; do
    if [ -e "$directory/$1" ]; then
        echo "$directory/$1"
        if [ "$all" = "yes" ]; then
            found="yes"
        else
            exit 0
        fi
    fi
done

if [ "$found" = "yes" ]; then
    exit 0
else
    exit 1
fi