import std.array, std.format, std.stdio;

string ctformat(const string s, const char beginDelimiter = '{', const char endDelimiter = '}')
{
    auto f = appender!string;
    string[] params;
    for (auto i = 0; i < s.length; i++)
    {
        auto c = s[i];
        if (c != beginDelimiter)
            f ~= c;
        else
        {
            i++;
            auto param = appender!string;
            while (i < s.length)
            {
                auto n = s[i];
                if (n == endDelimiter)
                    break;
                param ~= n;
                i++;
            }
            params ~= param.data;
        }
    }

    return format("format(`%s`, %s)", f.data, join(params, ", "));
}

void main()
{
    const name = "Bill";
    const numbers = 1000;
    const s = mixin(ctformat(`Hi, %{name}s! I have %,4?{'_'}{numbers}b bottles of beer.`));
    writeln(s);
}

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