GUI generated from DSL

Been using this great library for a few projects already.

Before I start doing something, that someone already did:

Since the DSL in the library is very good, it should be no problem to create nice GUI to allow entering the arguments by non-programmers without command line and using appropriate fields for various types. In my case I will go for java swing, but may switch to html with server side. Has anyone did anything like this?

Start by reviewing the library's DSL and how it represents argument types and fields. Decide whether a Java Swing GUI or an HTML server-side interface is in scope; done would mean a GUI can generate appropriate input fields from the DSL for non-programmers.

Written by the indexing model from the issue text.