Function common_params_parse_ex

common/arg.cpp:427–644

//

static bool common_params_parse_ex(int argc, char ** argv, common_params_context & ctx_arg) {
    common_params & params = ctx_arg.params;

    // setup log directly from params.verbosity: see tools/cli/cli.cpp
    common_log_set_verbosity_thold(params.verbosity);

    std::unordered_map<std::string, std::pair<common_arg *, bool>> arg_to_options;
    for (auto & opt : ctx_arg.options) {
        for (const auto & arg : opt.args) {
            arg_to_options[arg] = {&opt, /* is_positive */ true};
        }
        for (const auto & arg : opt.args_neg) {
            arg_to_options[arg] = {&opt, /* is_positive */ false};
        }
    }

    // handle environment variables
    for (auto & opt : ctx_arg.options) {
        std::string value;
        if (opt.get_value_from_env(value)) {
            try {
                if (opt.handler_void && is_truthy(value)) {
                    opt.handler_void(params);
                }
                if (opt.handler_int) {
                    opt.handler_int(params, std::stoi(value));
                }
                if (opt.handler_bool) {
                    opt.handler_bool(params, parse_bool_value(value));
                }
                if (opt.handler_string) {
                    opt.handler_string(params, value);
                    continue;
                }
            } catch (std::exception & e) {
                throw std::invalid_argument(string_format(
                    "error while handling environment variable \"%s\": %s\n\n", opt.env, e.what()));
            }
        }
    }

    // handle command line arguments
    auto check_arg = [&](int i) {
        if (i+1 >= argc) {
            throw std::invalid_argument("expected value for argument");
        }
    };

    auto parse_cli_args = [&]() {
        std::set<std::string> seen_args;

        for (int i = 1; i < argc; i++) {
            const std::string arg_prefix = "--";

            std::string arg = argv[i];
            if (arg.compare(0, arg_prefix.size(), arg_prefix) == 0) {
                std::replace(arg.begin(), arg.end(), '_', '-');
            }