`RefasterRuleCompiler` ignores all but one input file

First of all: Refaster is awesome. Defining new rules is child’s play. Super cool!

While playing around with it I defined a number of rewrite rules. If possible I’d like pass all of these to Error Prone in one go. But, while cursory look at the RefasterRuleCompiler indicates that it outputs a list of CodeTransformers to the file specified using the --out flag, only one of the input .java files actually contributes to the output. Would it be possible to combine multiple before/after templates into a single .refaster file?

(I’m not familiar with javac internals, but if you give me some pointers I’m willing to implement this generalization. Provided that you think this is a sound idea in the first place, of course.)

[lowasser]

FWIW: internally the refaster rule compiler only accepts one file at a time, but we also have a separate tool that assembles a “suite” (which can include mixed Refaster and Error Prone refactorings). We might be able to externalize that bit?

[PhilippWendler]

Thanks a lot @Stephan202! I hope a solution can be found that does not need the use of forks.

Given that the implementation of your first approach seems so trivial: Googlers (@nglorioso, @lowasser), is there hope that this gets integrated soon in error-prone? It absolutely makes sense to do this, and would make at least refaster usable in many cases until a more general solution like @Stephan202’s second approach can be done.