Function is_false

source/matplot/util/common.cpp:48–51

    }

    bool is_false(std::string_view str) {
        return iequals(str, "off") || iequals(str, "false") ||
               iequals(str, "no");
    }

    std::string run_and_get_output(const std::string &cmd) {
        auto res = std::string{};