Add build jobs/stages to .travis.yml (#80)

This will enable testing backward compatibility thanks to the build jobs for Xcode 10.0, 10.1 and 10.2.

.swiftlint.yml

@@ -14,3 +14,7 @@ line_length:
 
 function_body_length:
 - 50
+
+included:
+  - Sources
+  - Tests

.travis.yml

@@ -2,25 +2,50 @@
 # * https://www.objc.io/issues/6-build-tools/travis-ci/
 # * https://github.com/supermarin/xcpretty#usage
 
-osx_image: xcode10.1
+osx_image: xcode10.2
 language: swift
-before_install:
+
+jobs:
+  include:
+  - stage: lint
+    osx_image: xcode10.2
+    language: swift
+    before_install:
+      - brew update
+      - brew install swiftformat
+    script:
+      - swiftformat --lint --verbose .
+      - swiftlint
+  - &test
+    stage: test
+    osx_image: xcode10
+    language: swift
+    install: skip
+    env: TEST_DEVICE='platform=iOS Simulator,OS=12.0,name=iPhone SE'
+    script:
+      - xcodebuild -scheme TokamakUIKit -sdk iphonesimulator | xcpretty
+      - xcodebuild -scheme TokamakAppKit -sdk macosx10.14 | xcpretty
+      # this runs the build the second time, but it's the only way to make sure
+      # that `Package.swift` is in a good state
+      - swift build --target Tokamak
+      - xcodebuild test -enableCodeCoverage YES -scheme Tokamak | xcpretty
+  - <<: *test
+    osx_image: xcode10.1
+    env: TEST_DEVICE='platform=iOS Simulator,OS=12.1,name=iPhone SE'
+  - <<: *test
+    osx_image: xcode10.2
+    env: TEST_DEVICE='platform=iOS Simulator,OS=12.2,name=iPhone SE'
+    after_success:
+    - bash <(curl -s https://codecov.io/bash)
+
+# before_install:
 # - gem install cocoapods --pre # Since Travis is not always on latest version
-- brew update
-- brew install swiftformat
 # - brew outdated carthage || brew upgrade carthage
 # cache: cocoapods
 # podfile: Example/Podfile
 # before_install:
 # - gem install cocoapods # Since Travis is not always on latest version
 # - pod install --project-directory=Example
-script:
-- swiftformat --lint --verbose .
-- xcodebuild -scheme TokamakUIKit -sdk iphonesimulator
-- xcodebuild -scheme TokamakAppKit -sdk macosx10.14
-- xcodebuild test -enableCodeCoverage YES -scheme Tokamak
-after_success:
-- bash <(curl -s https://codecov.io/bash)
 # - swift build
 # - set -o pipefail && xcodebuild test -enableCodeCoverage YES -workspace Example/Tokamak.xcworkspace -scheme Tokamak-Example -sdk iphonesimulator11.0 ONLY_ACTIVE_ARCH=NO | xcpretty
 # - pod lib lint

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:4.2
+// swift-tools-version:5.0
 // The swift-tools-version declares the minimum version of Swift required to
 // build this package.
 
@@ -6,6 +6,10 @@ import PackageDescription
 
 let package = Package(
   name: "Tokamak",
+  platforms: [
+    .macOS(.v10_14),
+    .iOS(.v11),
+  ],
   products: [
     // Products define the executables and libraries produced by a package,
     // and make them visible to other packages.

Package@swift-4.2.swift

@@ -0,0 +1,63 @@
+// swift-tools-version:4.2
+// The swift-tools-version declares the minimum version of Swift required to
+// build this package.
+
+import PackageDescription
+
+let package = Package(
+  name: "Tokamak",
+  products: [
+    // Products define the executables and libraries produced by a package,
+    // and make them visible to other packages.
+    .library(
+      name: "Tokamak",
+      targets: ["Tokamak"]
+    ),
+    .library(
+      name: "TokamakUIKit",
+      targets: ["TokamakUIKit"]
+    ),
+    .library(
+      name: "TokamakAppKit",
+      targets: ["TokamakAppKit"]
+    ),
+    .library(
+      name: "TokamakTestRenderer",
+      targets: ["TokamakTestRenderer"]
+    ),
+  ],
+  dependencies: [
+    // Dependencies declare other packages that this package depends on.
+    // .package(url: /* package url */, from: "1.0.0"),
+  ],
+  targets: [
+    // Targets are the basic building blocks of a package. A target can define
+    // a module or a test suite.
+    // Targets can depend on other targets in this package, and on products
+    // in packages which this package depends on.
+    .target(
+      name: "Tokamak",
+      dependencies: []
+    ),
+    .target(
+      name: "TokamakDemo",
+      dependencies: ["Tokamak"]
+    ),
+    .target(
+      name: "TokamakUIKit",
+      dependencies: ["Tokamak"]
+    ),
+    .target(
+      name: "TokamakAppKit",
+      dependencies: ["Tokamak"]
+    ),
+    .target(
+      name: "TokamakTestRenderer",
+      dependencies: ["Tokamak"]
+    ),
+    .testTarget(
+      name: "TokamakTests",
+      dependencies: ["TokamakTestRenderer"]
+    ),
+  ]
+)