How do I change the path that Grammar-Kit's generated JFlex lexer Java file is generated into?
I've asked on Grammar-Kit's issue tracker, but haven't received any response.
I'm tired of of the lexer not being put into my generated files directory (where I would be able to easily delete it along with all my other generated file, and exclude it from searches, and IDE warnings and such).
I, too, got tired of of the lexer not being put into a generated files directory, so I skimmed through the plugin's source code to come up with an answer.
Grammar-Kit uses its own heuristic to decide where to stick your JFlex-generated lexer file, but that heuristic is obviously choosing wrongly in both of our cases.
If you want your generated lexer to go in the generated folder, and Grammar-Kit isn't doing that, it's because the way that GK is designed, your .flex file cannot be inside a source root. Of course, the .flex file is indeed a source file, but for GK's purposes it can't be marked that way — not if you want it to do the right thing and put its generated .java file into your designated generated folder [1].
Instead, move your .flex file out of any source folders, and into a content root that is not marked as a source directory. GK should now behave mostly properly [1]. For it's own source file, the .bnf file, it doesn't behave this odd way; only with the .flex file.
[1]: (actually, in my skimming, I think it may have looked like it's hardcoded specifically to go into a folder named 'gen', but I was only quickly skimming, so that may not be accurate. In either case, generating into a folder named 'gen' {the name most people choose for their generated folder anyway} should at least be sufficient, as your generated flex lexer will at least no longer be mixed in with your normal source files.)