transfer(){
    if [ $# -eq 0 ]; then
        echo "No arguments specified.\nUsage:\n  transfer <file|directory>\n  ... | transfer <file_name>">&2
        return 1
    fi

    if tty -s; then
        file="$1"
        file_name=$(basename "$file")

        if [ ! -e "$file" ]; then
            echo "$file: No such file or directory">&2
            return 1
        fi

        if [ -d "$file" ]; then
            file_name="$file_name.zip"
            (cd "$file" && zip -r -q - .) | curl --progress-bar --upload-file "-" "https://transfer.sh/$file_name" | tee /dev/null
        else
            cat "$file" | curl --progress-bar --upload-file "-" "https://transfer.sh/$file_name" | tee /dev/null
        fi
    else
        file_name=$1
        curl --progress-bar --upload-file "-" "https://transfer.sh/$file_name" | tee /dev/null
    fi
}