Key and Param default value - Githubissues

jakeheis / SwiftCLI

A powerful framework for developing CLIs in Swift

MIT License

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Key and Param default value #85

Open yonaskolb opened 4 years ago

yonaskolb commented 4 years ago

It would be awesome to have an optional default value for Param and Key. This would allow:

setting the default value in the same place as the rest of the option configuration, instead of down in execute with option ?? defaultValue
allow Param and Key to have non optional types (Param already supports non optional types but currently fails if value not supplied)
allow an option to HelpMessageGenerator that would print the default value of options, perhaps after the description eg: " Defaults to \(defaultValue)"

@Key("--type", "-t", description: "The type of dump to output", defaultValue: .yaml)
private var dumpType: DumpType

jakeheis commented 3 years ago

This was near impossible when property wrappers were new and the Swift compiler crashed while doing just about anything with property wrappers. I think it's worth attempting this feature again now in Swift 5.4 though -- will implement when I get a chance