TODO 1: After Parse callback [COMPLETED]

Currently interdependent arguments are a problem. In the current version we are handling them as closures. We create two stateful actions who are taking the state from the close over of the lambda. This is a little hacky/ugly. To fix this we could have a callback/on_parse_done event. An example usage could be;

parser.after_parse([&parser]() {
    auto grep_val = parser.get_optional<std::string>("grep");
    auto file_val = parser.get_optional<std::string>("file");
    
    if (grep_val && file_val) {
        grep(*grep_val, *file_val); 
    } else if (grep_val) {
        std::cerr << "grep requires file\n";
    }
});

After handle_parse(...) ends, we can call the on_parse_done callbacks. But this requires two things;

Storable arguments. Those would be not actions, but stored values. So you could get them later on in the callback or somewhere else.
The on_parse_done callbacks should be called after all actions are invoked. But we should make this a toggle, so the callback only gets executed if the user explicitly wants it to be called. By default we would enable it.

Self reminder, implement this feature. It'd be helpful.

Update: 6 Oct. 2025

We now have storable arguments. Now we need to implement the on_parse_done callbacks, to achieve this feature.

Also the run after complete events are implemented.

TODO 2: Positional arguments

Positional arguments are arguments that are not prefixed with a dash. They are usually the arguments that are passed to the program. For example, in the command grep "pattern" file.txt, "pattern" and "file.txt" are positional arguments.

TODO 3: Separate headers from implementations

Right now whole project is header only. Header only so far is fine but to avoid issues later on, it's better if we separate them.

TODO 4: Configure CMAKE

Configure CMAKE to ensure the library can be built as a library and can be installed via CMAKE. This should make adoptation of this to existing projects easier with less headache.

TODO 5: Display help

Display help doesn't reflect the conventions right now. Also it should come automatically, and should be allowed to overriden by user.

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