sbt new templating: reflective api for GUIs

[jastice]

Since Activator is being decommissioned, I'd like to replace the template support in the Scala plugin with sbt new support.

Problem is that the TemplateResolver interface as it is would force users to go to the command line to supply parameters to g8 (or any other resolver) after choosing a template.

For g8 at least, it would probably be sufficient to be able to query parameters, default values, etc via the sbt shell or server and provide them to the GUI.

If this is a reasonable addition I can work on implementing it.

[eed3si9n]

As you noted sbt new just hands off the control to underlying program via sbt-giter8-resolver (or sbt-fmpp-resolver).

You probably can emulate the CI dialog by reading the properties file. I think that's a good idea.

[nafg]

What's the plan with this?

[jastice]

As discussed in https://youtrack.jetbrains.com/issue/SCL-10898 we'll consider supporting giter8 directly, which should make it easier to integrate.