function zrep_fpath() {
    local base_dir="$1"

    # Check if the base directory exists
    if [[ ! -d "$base_dir" ]]; then
        echo "Error: Base directory '$base_dir' does not exist."
        return 1
    fi

    # Add directories containing at least one file to fpath
    for dir in $base_dir/**/*(/N); do
        if [[ -n $(ls -A "$dir") ]]; then
            fpath=($dir $fpath)
        fi
    done
}