Test SwiftPM with Travis (#34)

.travis.yml

@@ -3,7 +3,7 @@ branches:
     - master
 stages:
   - lint
-  - carthage
+  - compile
   - test
 jobs:
   include:
@@ -53,7 +53,7 @@ jobs:
       env: SWIFT=4.2
       name: pod lib lint --swift-version=4.2
 
-    - stage: carthage
+    - stage: compile
       osx_image: xcode10
       name: Carthage / watchOS
       os: osx
@@ -64,6 +64,37 @@ jobs:
         directories:
         - Carthage
 
+# Alamofire does not yet support Linux
+    # - &linux
+    #   stage: compile
+    #   env: SWIFT_BUILD_VERSION=3  SWIFT_VERSION=4.0.3
+    #   name: Linux / Swift 3.2.3
+    #   os: linux
+    #   dist: trusty
+    #   sudo: required
+    #   language: generic
+    #   before_install:
+    #     eval "$(curl -sL https://swiftenv.fuller.li/install.sh)"
+    #   script:
+    #     swift build -Xswiftc -swift-version -Xswiftc $SWIFT_BUILD_VERSION
+    # - <<: *linux
+    #   env: SWIFT_BUILD_VERSION=4  SWIFT_VERSION=4.2.1
+    #   name: Linux / Swift 4.2.1
+
+    - &swiftpm
+      stage: compile
+      name: Xcode 8.3 / SwiftPM
+      os: osx
+      osx_image: xcode8.3
+      language: objective-c
+      script: swift build
+    - <<: *swiftpm
+      name: Xcode 9.4 / SwiftPM
+      osx_image: xcode9.4
+    - <<: *swiftpm
+      name: Xcode 10.1 / SwiftPM
+      osx_image: xcode10
+
     - &test
       stage: test
       osx_image: xcode10

Package@swift-4.2.swift

@@ -0,0 +1,23 @@
+// swift-tools-version:4.2
+
+import PackageDescription
+
+let pkg = Package(name: "PMKAlamofire")
+pkg.products = [
+    .library(name: "PMKAlamofire", targets: ["PMKAlamofire"]),
+]
+pkg.dependencies = [
+    .package(url: "https://github.com/Alamofire/Alamofire.git", .upToNextMajor(from: "4.0.0")),
+    .package(url: "https://github.com/mxcl/PromiseKit.git", .upToNextMajor(from: "6.0.0"))
+]
+pkg.swiftLanguageVersions = [.v3, .v4, .v4_2]
+
+let target: Target = .target(name: "PMKAlamofire")
+target.path = "Sources"
+target.exclude = ["Tests"]
+target.dependencies = [
+    "PromiseKit",
+    "Alamofire"
+]
+
+pkg.targets = [target]