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Custom parsing with IArgumentParser<T>

For types with no built-in support, implement IArgumentParser<T> and annotate the parameter with [ArgumentParser].

public class SemVerParser : IArgumentParser<SemVer>
{
    public static bool TryParse(string value, out SemVer result) =>
        SemVer.TryParse(value, out result);
}

Annotate the parameter with [ArgumentParser(typeof(...))]:

public static Task<int> Release([ArgumentParser(typeof(SemVerParser))] SemVer version) { … }
// myapp release 1.2.3

IArgumentParser<T> is defined in Nullean.Argh.Interfaces.

Tip

If you are building a shared library of custom parsers for reuse across multiple CLI apps, reference the interfaces package directly:

<ItemGroup>
  <PackageReference Include="Nullean.Argh.Interfaces" />
</ItemGroup>

For normal apps that reference Nullean.Argh or Nullean.Argh.Hosting, the interfaces are already available transitively.