* Use existential CodingKey parameters consistently
Swift 5.7 supports implicit opening for existentials, so these
conversions from `CodingKey` parameters to pass to methods that
are generic over `CodingKey` work fine. Prior to Swift 5.7, however,
these don't compile, with the message that `CodingKey` doesn't conform
to itself.
* Bump the required Swift version for the count-lines test
The overload resolution for the `static func main()` in an `@main`
type still had issues in Swift 5.6, such that a package with a min.
platform below that which works for concurrency backdeployment doesn't
properly resolve the AsyncParsableCommand `main()` function. In
Swift 5.7, this is properly resolved, so just the availability on
the main type is sufficient.
This change just skips the test of `count-lines` prior to Swift 5.7,
so that we can maintain the open platform minimum for the package
as a whole.
- Fixes#466.
- Adds initializers to ArgumentDefinition generic over a Container type.
The Container type must conform to a new internal protocol
ArgumentDefinitionContainer which describes functionality like default
set of help options for the argument defined by the property wrapper,
etc.
- Adds overloads for Optional @Arguments and @Options with default
values which emit deprecation warning to guide users towards using the
non-Optional versions.
Adds a new `AsyncParsableCommand` protocol, which provides a
`static func main() async` entry point and can call through to the root
command's or a subcommand's asynchronous `run()` method. For this
asynchronous execution, the root command must conform to `AsyncParsableCommand`,
but its subcommands can be a mix of asynchronous and synchronous commands.
Due to an issue in Swift 5.5, you can only use `@main` on an
`AsyncParsableCommand` root command starting in Swift 5.6.
This change also includes a workaround for clients that are using Swift 5.5.
Declare a separate type that conforms to `AsyncMainProtocol` and add the `@main`
attribute to that type.
```
@main enum Main: AsyncMain {
typealias Command = <#command#>
}
```
Nate Cook
Rauhul Varma
Kth