New library: argparse, for parsing CLI arguments

[Steven Schveighoffer]

On 10/13/21 7:27 AM, Andrey Zherikov wrote:
> Hi everyone,
> 
> I'm happy to announce that I've published a CLI argument parsing library 
> - [argparse](https://code.dlang.org/packages/argparse). It's been around 
> for some time already so please take a look and provide your feedback if 
> you haven't done so.
> 
> The reasoning to create one more CLI parsing library is that the 
> existing libraries do not provide enough flexibility in parsing that I'm 
> looking for and/or they depend on other libraries. As a result 
> `argparse` supports wide variety of data types including enums, 
> callbacks and arrays as well as a fully customized argument parsing. It 
> also doesn't depend on anything besides the standard library.
> 
> Since it's in active development (activeness depends on my availability 
> of course), I have few things to do before making the first major 
> release so stay tuned and/or contribute if you'd like to.

I was literally just thinking about how something like this would be 
useful yesterday. It's amazing when the universe just listens to me and 
provides what I was hoping for!

One nitpick -- you should be able to opt in using the name of the field 
member instead of having to write `@NamedArgument`. e.g. your `string 
unused` parameter requires a `@NamedArgument("unused")` which seems 
unnecessary.

-Steve