Moya on Swift 2.3 & 3.0.

[aaroncrespo]

Took a crack at checking out swift 2.3 support this morning...

The good news:

• Apple's migrator tool is great, after running on Moya, the demo target and tests (iOS,tvOS) built and worked/passed
• The changes don't look too bad from Moya's end
• Foundation Value types and the new Swift API Guidelines don't come into play until Swift 3 which greatly limits changes.

• swift 2 and 2.3 can live side by side with #if swift(>=2.3) ...

  The meh news:

• Nimble under macOS had some issues I've seen reported as Xcode/Foundation related -- affects macOS test target

• xcodebuild doesn't pick up the swift legacy flag which triggers a compile against a 2.0 toolchain Xcode _should_ in the future hopefully not do this. Until then rake build and rake test don't work without setting the TOOLCHAINS Environment flag. This is probably a bug in xcodebuild.
• Relatedly Setting of the legacy swift flag is not performed by the migrator maybe because they want 2.0/2.3/3.0 to try and live side by side but that will cause weirdness with dependent projects.

So tracking what happened when I got it all building:

• _Moya Changes:_
• [ ] A couple URL API's changed nullability. Should check documentation and expectations and see if implicitly unwrapped is safe. Most are similar to:

 public func url(route: TargetType) -> String {
-    return route.baseURL.URLByAppendingPathComponent(route.path).absoluteString
+    return route.baseURL.URLByAppendingPathComponent(route.path)!.absoluteString!
 }

• [x] Decision on setting Swift Legacy flags. 2.0 and 2.3 coexisting is great, but value types + API guideline changes are not a small change. (probably breaking or a lot of fixme writing)
• _Dependencies_
• [ ] Alamofire: https://github.com/Alamofire/Alamofire/pull/1313
• [ ] Result: GTG
• [x] Quick/Nimble: https://github.com/Quick/Quick/issues/55, https://github.com/Quick/Nimble/pull/302
• [ ] RxSwift: ??
• [ ] ReactiveCocoa: ?? some small attribute updates -- Don't know if they have an issue yet.

P.S. It's been a while since I ran Moya in dev mode and it took me a little while to get oriented, do you guys think a quick _Getting Started With Developing Moya_ section somewhere would be useful? maybe #270. I don't really use rake for build scripting so it took a bit to get that setup.

[brentleyjones]

RxSwift: ??

With ReactiveX/RxSwift@9b1583f2e365ef78d250be278ca5838076b58095 RxSwift supports Swift 2.3. It doesn't have the correct build flag.

[ashfurrow]

This is great work and a nice comprehensive write-up, thanks @aaroncrespo!

[aaroncrespo]

Another thing to think about is if it makes sense to skip 2.3 and go straight to 3.0 or how to support 3 versions. The #if swift() tests don't work so well when swift 3.0 is in the mix.

[lowell]

Sorry about the accidental closure. Misunderstood what 'Close' meant in a third-party GitHub client. Was just trying to close the issue view. 😳

[ashfurrow]

No problem, it happens!

[brentleyjones]

I highly recommend a Swift 2.3 build, even as a version bump, before going to Swift 3. Alamofire had breaking changes so without this people won't be able to use pre-Swift 3 on Xcode 8. I know I'll be using Xcode 8 and Swift 2.3 for a while after the release.

[sunshinejr]

I've changed the title due to #522 discussion.

[orta]

Aye, think it's worth shipping a 2.3 dupe of current Moya, one the Rx deps have them, then moving to 3.0

[ashfurrow]

That makes sense – should we make 2.3 version off of master or the most recent commit? (master has breaking changes.)

[orta]

Maybe the last stable release?

[aaroncrespo]

Looks like Alamofire is about to cut a 3.5.0 release which will have both swift 2.2 and swift 2.3 support. Then Moya.spec can point to that.

https://github.com/Alamofire/Alamofire/milestone/27

I think this is the dependency to push a release supporting 2.3

[tdouglas1313]

Is there any update on swift 3.0 support now that Xcode 8 GM is out

[tommy60703]

Need swift 2.3 and swift 3.0 support here...

[sunshinejr]

We will have to wait before updating to the GM Seed version:

• [x] [RxSwift#869](https://github.com/ReactiveX/RxSwift/pull/869)
• [x] [Result](https://github.com/antitypical/Result) update

Edit: I've opened #608 for Swift 3.0 support.

[BasThomas]

@sunshinejr It seems Result already is Swift 3. :)

[AndrewSB]

This looks like it's been solved with the 8.0.0 beta releases, I'm going to close it out. Please feel free to open this if there are any loose ends!