import std.stdio;
import darg;

struct Options
{
    @Option("help", "h")
    @Help("Prints this help.")
    OptionFlag help;

    @Option("threads", "t")
    @Help("Number of threads to use.")
    size_t threads;

    @Argument("file", Multiplicity.zeroOrMore)
    @Help("Input files")
    string[] files;
}

// Generate the usage and help string at compile time.
immutable usage = usageString!Options("example");
immutable help = helpString!Options;

int main(string[] args)
{
    Options options;

    try
    {
        options = parseArgs!Options(args[1 .. $]);
    }
    catch (ArgParseError e)
    {
        writeln(e.msg);
        writeln(usage);
        return 1;
    }
    catch (ArgParseHelp e)
    {
        // Help was requested
        writeln(usage);
        write(help);
        return 0;
    }

    foreach (f; options.files)
    {
        // Use files
    }

    return 0;
}