test

        return "";

    }

    if (name == "file") {

        // $(file OP FILENAME[,TEXT]) — OP is <, > or >>.

        //   $(file < name)        read file contents (one trailing newline stripped)

        //   $(file > name,text)   write text (truncate); a trailing newline is added

        //   $(file >> name,text)  append text

        std::string a = do_expand(args, mf, auto_vars);

        size_t p = a.find_first_not_of(" \t");

        if (p == std::string::npos) return "";

        std::string op;

        if (a.compare(p, 2, ">>") == 0) { op = ">>"; p += 2; }

        else if (a[p] == '>')          { op = ">";  p += 1; }

        else if (a[p] == '<')          { op = "<";  p += 1; }

        else return "";

        p = a.find_first_not_of(" \t", p);

        std::string rest = (p == std::string::npos) ? "" : a.substr(p);

        if (op == "<") {

            std::string fname = rest;

            size_t e = fname.find_last_not_of(" \t");

            fname = (e == std::string::npos) ? "" : fname.substr(0, e + 1);

            std::ifstream f(fname);

            if (!f.is_open()) return "";

            std::stringstream ss;

            ss << f.rdbuf();

            std::string content = ss.str();

            if (!content.empty() && content.back() == '\n') content.pop_back();

            return content;

        }

        // write / append

        size_t comma = rest.find(',');

        std::string fname = (comma == std::string::npos) ? rest : rest.substr(0, comma);

        std::string text  = (comma == std::string::npos) ? "" : rest.substr(comma + 1);

        size_t e = fname.find_last_not_of(" \t");

        fname = (e == std::string::npos) ? "" : fname.substr(0, e + 1);

        if (!fname.empty()) {

            std::ofstream f(fname, (op == ">>") ? std::ios::app : std::ios::trunc);

            if (f.is_open()) {

                f << text;

                if (text.empty() || text.back() != '\n') f << '\n';

            }

        }

        return "";

    }

    if (name == "warning") {

        std::string text = do_expand(args, mf, auto_vars);

        std::cerr << "makeplus: *** warning: " << text << std::endl;