Improve SPM Integration, break into sub-modules 📦

[portellaa]

Checklist

• I've rebased my changes on top of master
• I've built and run the project to see all new and existing tests pass
• I've followed the Mindera swift style guide
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.

Motivation and Context

Since Swift Package Manager is becoming quite popular and Alicerce via CocoaPods supports subspecs, this is quite achievable with Swift Package Manager. It isn't very fancy, but at least is supported.

Description

So each module as it's own target which will be referenced by each library.

The name of the target it's only visible in the xcode project and the library is what is exposed to the products of libraries that includes Alicerce.
That's why i have named each library with the prefix Alicerce and gave the name of the module to the target.

Regarding the Extensions, since SPM doesn't supports the same as CocoaPods supports - sub-subspecs - the only way to achieve that is using a library with the name AlicerceExtensionsFoundation, ...

It would become something like:

// swift-tools-version:5.1

import PackageDescription

let package = Package(
    name: "Alicerce",
    platforms: [
        .iOS(.v10)
    ],
    products: [
        .library(
            name: "Alicerce",
            targets: [
                "Analytics",
                "Core",
                "DeepLinking",
                "ExtensionsFoundation",
                "ExtensionsQuartzCore",
                "ExtensionsUIKit",
                "Logging",
                "Network",
                "Observers",
                "PerformanceMetrics",
                "Persistence",
                "Resource",
                "Stores",
                "View"
            ]
        ),
        .library(name: "AlicerceAnalytics", targets: ["Analytics"]),
        .library(name: "AlicerceCore", targets: ["Core"]),
        .library(name: "AlicerceDeepLinking", targets: ["DeepLinking"]),
        .library(name: "AlicerceExtensionsFoundation", targets: ["ExtensionsFoundation"]),
        .library(name: "AlicerceExtensionsQuartzCore", targets: ["ExtensionsQuartzCore"]),
        .library(name: "AlicerceExtensionsUIKit", targets: ["ExtensionsUIKit"]),
        .library(name: "AlicerceLogging", targets: ["Logging"]),
        .library(name: "AlicerceNetwork", targets: ["Network"]),
        .library(name: "AlicerceObservers", targets: ["Observers"]),
        .library(name: "AlicercePerformanceMetrics", targets: ["PerformanceMetrics"]),
        .library(name: "AlicercePersistence", targets: ["Persistence"]),
        .library(name: "AlicerceResource", targets: ["Resource"]),
        .library(name: "AlicerceStores", targets: ["Stores"]),
        .library(name: "AlicerceView", targets: ["View"]),
    ],
    targets: [
        .target(name: "Analytics", dependencies: ["Core"]),
        .target(
            name: "Core",
            dependencies: ["ExtensionsFoundation", "ExtensionsQuartzCore", "ExtensionsUIKit"],
            path: "Sources",
            sources: ["Shared", "Utils"]
        ),
        .target(name: "DeepLinking", dependencies: ["Core"]),
        .target(name: "ExtensionsFoundation", path: "Sources/Extensions/Foundation"),
        .target(name: "ExtensionsQuartzCore", path: "Sources/Extensions/QuartzCore"),
        .target(name: "ExtensionsUIKit", path: "Sources/Extensions/UIKit"),
        .target(name: "Logging", dependencies: ["Core"]),
        .target(name: "Network", dependencies: ["Resource"]),
        .target(name: "Observers", dependencies: ["Core"]),
        .target(name: "PerformanceMetrics", dependencies: ["Core"]),
        .target(name: "Persistence", dependencies: ["Core", "Logging", "PerformanceMetrics"]),
        .target(name: "Resource", dependencies: ["Core"]),
        .target(
            name: "Stores",
            dependencies: ["Core", "Logging", "Network", "PerformanceMetrics", "Persistence", "Resource"]
        ),
        .target(name: "View", dependencies: ["Core"])
    ],
    swiftLanguageVersions: [ .version("5") ]
)

⚠️ important ⚠️ :
Regarding the tests Target has Objective-C code, this is not supported by Swift Package Manager, as far as i know, i'm still investigating.
One thing i can do is exclude the CoreData path, since this is the one that includes Objective-C code.

EDIT: We are not adding support for Unit Tests via SPM for now, and will leave that as future work. CocoaPods is under the same situation.

All the suggestions are welcome, let's support modules on SPM 🚀

Additions

• Remove QuartzCore extensions sub-sub-spec and merge them into UIKit extensions
• Add reference to Alicerce SPM package in workspace for easier iteration
• Add schemas for each library product (main + sub-libraries) that are now available via SPM
• Add stage in Travis CI to build the products via SPM

[codecov]

Codecov Report

Merging #205 (b79d10a) into master (85f7848) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   94.96%   94.96%           
=======================================
  Files          97       97           
  Lines        3254     3254           
=======================================
  Hits         3090     3090           
  Misses        164      164           

Impacted Files	Coverage Δ
...es/Analytics/Trackers/Analytics+MultiTracker.swift	100.00% <ø> (ø)
Sources/DeepLinking/Route+TrieRouter.swift	91.78% <ø> (ø)
Sources/Extensions/UIKit/CAGradientLayer.swift	100.00% <ø> (ø)
Sources/Extensions/UIKit/CALayer.swift	100.00% <ø> (ø)
Sources/Logging/Loggers/Log+MultiLogger.swift	97.36% <ø> (ø)
Sources/Logging/Loggers/Logger.swift	100.00% <ø> (ø)
Sources/Logging/Loggers/ModuleLogger.swift	100.00% <ø> (ø)
Sources/Network/Network+BaseRequestMaking.swift	100.00% <ø> (ø)
Sources/Network/Network+URLSessionError.swift	100.00% <ø> (ø)
...urces/Network/Network+URLSessionNetworkStack.swift	96.15% <ø> (ø)
... and 14 more

---

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[p4checo]

Looks great! 🚀 Minor 💄 comment

[p4checo]

Regarding your questions, @portellaa:

1. Extensions sub-sub-specs equivalent in SPM
   Do you think it's worth it? IMO perhaps we can drop them for SPM 🤔

2. Test targets in SPM
   We currently don't publish our tests via CocoaPods either (although I have that almost done in a stash 😅), so we don't have to in SPM either, I guess 😇. I agree that would be nice, but perhaps we can leave that as a future improvement?
   The Obj-C limitation you mention only affects test targets?

Additionally, do you think we should add a stage on our pipeline to validate the SPM package description?

[diogoeiras]

👌