Swift Package Manager support

[SergeyKuryanov]

Fixes #4

To test this Xcode 12 is required.

I had to duplicate copy-helper.sh script due to big differences in paths. Maybe we can generalize logic in copy-helper.sh and create variants for Carthage and SwiftPM?

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IssueHunt Summary

### Referenced issues This pull request has been submitted to: - [#4: Support Swift Package Manager](https://issuehunt.io/repos/98812730/issues/4) ---

[sindresorhus]

I had to duplicate copy-helper.sh script due to big differences in paths. Maybe we can generalize logic in copy-helper.sh and create variants for Carthage and SwiftPM?

Nah. I plan to drop support for Carthage when Xcode 12 is out.

[sindresorhus]

Did you test that this actually works properly? That the helper app is copied into the app bundle, properly signed, and that the containing app launches at login?

[SergeyKuryanov]

@sindresorhus sorry, no. I already spot an issue, move PR into Draft, and thinking about how to fix it. Here is the problem: SwiftPM can build only plain executables, not APP. But I believe that the helper needs to be an APP? To make this happen I see only one way - make the helper as separate project into resources and build it in Run Script stage with own script. What do you think?

[sindresorhus]

Alternatively, we could just prebuild the helper app and commit it to the repo. The helper app will rarely change anyway. I think that would be easier and be less fragile.

[SergeyKuryanov]

Great idea. I am not very familiar with Mac Dev, do we need to include Debug and Release versions or just Release will be enough?

[sindresorhus]

Just "release".

[SergeyKuryanov]

@sindresorhus seems like everything works as expected now. Test app launches after the start of Debug and Release configs while using Remote Package.

[sindresorhus]

I just realized, now that we bundle the built helper app, we could solve: https://github.com/sindresorhus/LaunchAtLogin#the-size-of-my-app-increased-after-adding-launchatlogin We could bundle two helper apps, the current one, and a version that is built with target macOS 10.14.4 and later (that's the only difference), which wouldn't need all the Swift runtime libraries. The copy-helper script could detect the target macOS version and choose the correct helper app. Would you be willing to add that?

We script could check the environment variable MACOSX_DEPLOYMENT_TARGET.

[sindresorhus]

Can you fix the merge conflict?

[sindresorhus]

Sorry for the delay. I will get to this soon. I haven't prioritized it as it cannot be released until Xcode 12 final is out anyway (which is at least 3 weeks).

[sindresorhus]

I have now thoroughly tested this using Xcode 12 GM and it seems to work great. Nice work! 👍🏻