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Taywee avatar Taywee commented on September 4, 2024 1

There's the KickOut attribute on Base: https://taywee.github.io/args/classargs_1_1Base.html

You can set this to true on any argument that you want to terminate parsing on, and then use the iterator APIs for the rest.

As an example of this:

#include <iostream>
#include <args.hxx>
int main(int argc, char **argv)
{
    args::ArgumentParser parser("This is a test program.", "This goes after the options.");
    args::HelpFlag help(parser, "help", "Display this help menu", {'h', "help"});
    args::Positional<std::string> filename(parser, "filename", "The file name");
    filename.KickOut(true);
    parser.Prog(argv[0]);
    const std::vector<std::string> args(argv + 1, argv + argc);
    const auto begin = std::begin(args);
    const auto end = std::end(args);
    auto rest = begin;
    try
    {
        rest = parser.ParseArgs(begin, end);
    }
    catch (const args::Completion& e)
    {
        std::cout << e.what();
        return 0;
    }
    catch (const args::Help&)
    {
        std::cout << parser;
        return 0;
    }
    catch (const args::ParseError& e)
    {
        std::cerr << e.what() << std::endl;
        std::cerr << parser;
        return 1;
    }
    std::cout << "Filename: " << *filename << '\n';

    for (;rest != end; ++rest) {
        std::cout << "Arg: " << *rest << '\n';
    }

    return 0;
}

And use of it:

> g++ -osample sample.cxx -I.

> ./sample -h main.py
  ./sample {OPTIONS} [filename]

    This is a test program.

  OPTIONS:

      -h, --help                        Display this help menu
      filename                          The file name
      "--" can be used to terminate flag options and force all following
      arguments to be treated as positional options

    This goes after the options.

> ./sample main.py -h
Filename: main.py
Arg: -h

>

You could then use another parser on the rest (which is how subparsers and commands work), or pass it into an internal program, or whatever you want. rest to end are your iterators in that case.

from args.

mark-sed avatar mark-sed commented on September 4, 2024 1

Hello, thank you so much for the quick answer and amazing example. It all works just as I wanted.

from args.

Taywee avatar Taywee commented on September 4, 2024

Gladly! Another option that will work similarly is to gather the rest in a PositionalList<std::string> rest argument at the end, and enforce that all calls use -- between the arguments. I find this way slightly less surprising, because the -- clearly signals separation between the internal and external arguments, but plenty of tools (particularly most language interpreters and docker and podman) just use a positional to implicitly separate. It's just a matter of personal taste and style.

from args.

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