Golang support

[sp-magicspells]

Can we start supporting golang?

[mkr-plse]

We haven't currently planned support for Go. Contributions are welcome.

[sp-magicspells]

Thanks @mkr-plse. It would be very helpful If someone from Uber team guide us through supporting another language like Go.

[mkr-plse]

Happy to help. Here are possible steps:

1. Handcraft an input file with possible uses of feature flag APIs and then manually refactor it for treatment and control behavior. This forms the test for the implementation. For example, this testfile in Swift is refactored as shown here when treated, and refactored as follows when flag is in control.
2. Use the go ast package to parse and rewrite the code. I think this blog article has some pointers on getting started.
3. Internally, you may need to do partial program evaluation and can follow the implementation here (or as described in Section 4.3 of the paper) to simplify expressions for the rewrites.
4. For the first version of the implementation, the deep clean pass (where code deletion exposes more opportunities for deletion) can be elided.

If you run into any issues, please feel free to reach out.

[mkr-plse]

#112 implements PiranhaGo