accept vector<string> for argv

[sfinktah]

Because sometimes you don't have access to the command line arguments in their raw form...

std::vector<std::string> args;
int main(int argc, char** argv) {
   for (size_t i=0; i < argc; ++i)
      args.emplace_back(argv[0]);
   run_application();
}

void application() {
   auto cmdl = argh::parser(args);
   // ...
}

[adishavit]

Why void parser::parse(....?

[sfinktah]

lol, copy and paste from implementation... mode should also have a default. lemme fix.

btw also allows argh to parse any old array of strings, can be quite interesting. i'll fix that pr.

i also added this to my personal build, but as i haven't tested it yet, i won't push it.

it's basically for a use-case where you might have two same-meaning multiple-argument parameters, eg --exclude-file --exclude-files --exclude-path --exclude-path

i also thought it might be able to be written better with an iterator, but it was beyond me.

    inline std::vector<std::pair<std::string, std::string>> parser::params(std::initializer_list<char const* const> init_list) const {
        std::vector<std::string> names;
        for (auto name : init_list)
            names.emplace_back(trim_leading_dashes(name));

        std::vector<std::pair<std::string, std::string>> results;
        for (const auto& param : params_)
            if (std::any_of(names.begin(), names.end(), [&](const std::string& name) { return name == param.first; }))
                results.emplace_back(param.first, param.second);
        return results;
    }