Function to extract all di entities by type

Started in slack

Could you provide a way to extract all DI entities (with their tags) from a DI container? This would be very useful for CLI applications, where you have some tagged processors controlled by cli flag that do same work in different context. Consider this example using kotlinx-cli:

val di = DI {
  bind<MavenScannerService<*>>("mavenCentral") with singleton { MavenScannerServiceImpl(...) }
  bind<MavenScannerService<*>>("jCenter") with singleton { MavenScannerServiceImpl(...) }
  bind<MavenScannerService<*>>("google") with singleton { MavenScannerServiceImpl(...) }
}

fun main(args: Array<string>) {
  val parser = ArgParser("scanner")
  val scanners: Set<Pair<String?, DIProvider<MavenScannerService<*>>>> = di.direct.allProviderBindings<MavenScannerService<*>>() // <--------------- New API, alternatives for instances and factories omitted

  val scanner by parser.argument(
    type = ArgType.Choice(scanners.mapNotNull { it.first }, { scanners.find { (tag, _) ->  it == tag } }),
    description = "Repository alias to scan for"
  )
  parser.parse(args)

  // do stuff with scanner
}

[romainbsl]

I will think about that. This is kind of hacking the container, I will see if we really want to document this.

If so, I will create a another issue. Thx

[mpetuska]

While this definitely solves my issue, could I ask that this issue is reopened in order to lift up those undocumented APIs into public domain?