| cut -f1 -d' ' \
            | sed 's/^codegen:://'
    )
}

# shellcheck disable=SC2207 # safe, no functions have spaces
all_codegens=($(list_codegens))

function print_codegens() {
    echo "available codegens:"
    for g in "${all_codegens[@]}"; do
        echo "    $g"
    done
}

# Validate and accumulate flags to pass thru and codegens to run if args are
# specified.