revise syntax for main class designation

[maxandersen]

after implementing support for doing jbang info.picocli:picocli-codegen:4.2.0/picocli.codegen.aot.graalvm.ReflectionConfigGenerator I realised that specifying the main class that way doesn't work for plain jar based launches, ie. jbang helloworld.jar/blah.main will fail as no (good) way to know /blah.main is not the intended file.

my first thought is to add a --main or similar flag; would also make it much more explicit and code simipler to be honest.

@quintesse wdyt?

[quintesse]

Yes, I think that would be a good idea. For a moment I thought about using #, which is a typìcal thing for UIRLs. But I prefer being explicit with a flag.

[maxandersen]

# is treated as a comment in bash thus it will just cancel out everything else.

[quintesse]

Yeah, you'd have to quote the entire argument. So a flag is just better in every way IMO. 👍

[maxandersen]

done; -m/--main now forcefully overrides any main class "calculation" for jar or script running...