SPM support

Package.swift

@@ -0,0 +1,28 @@
+// swift-tools-version:4.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "Turf",
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "Turf",
+            targets: ["Turf"]),
+    ],
+    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: "Turf",
+            dependencies: []),
+        .testTarget(
+            name: "TurfTests",
+            dependencies: ["Turf"]),
+    ]
+)

Turf/CoreLocation.swift → Sources/Turf/CoreLocation.swift

@@ -1,7 +1,14 @@
+import Foundation
+#if os(Linux)
+public struct CLLocationCoordinate2D {
+    let latitude: Double
+    let longitude: Double
+}
+public typealias CLLocationDirection = Double
+public typealias CLLocationDistance = Double
+public typealias CLLocationDegrees = Double
+#else
 import CoreLocation
-
-#if os(OSX)
-let CLLocationDistanceMax: CLLocationDistance = .greatestFiniteMagnitude
 #endif
 
 extension CLLocationDirection {

Turf/Turf.swift → Sources/Turf/Turf.swift

@@ -1,4 +1,7 @@
+import Foundation
+#if !os(Linux)
 import CoreLocation
+#endif
 
 public typealias LocationRadians = Double
 public typealias RadianDistance = Double
@@ -274,13 +277,13 @@ public struct Polyline {
             let intersectionPoint = Turf.intersection((perpendicularPoint1, perpendicularPoint2), segment)
             let intersectionDistance: CLLocationDistance? = intersectionPoint != nil ? coordinate.distance(to: intersectionPoint!) : nil
 
-            if distances.0 < closestCoordinate?.distance ?? CLLocationDistanceMax {
+            if distances.0 < closestCoordinate?.distance ?? .greatestFiniteMagnitude {
                 closestCoordinate = IndexedCoordinate(coordinate: segment.0, index: index, distance: distances.0)
             }
-            if distances.1 < closestCoordinate?.distance ?? CLLocationDistanceMax {
+            if distances.1 < closestCoordinate?.distance ?? .greatestFiniteMagnitude {
                 closestCoordinate = IndexedCoordinate(coordinate: segment.1, index: index+1, distance: distances.1)
             }
-            if intersectionDistance != nil && intersectionDistance! < closestCoordinate?.distance ?? CLLocationDistanceMax {
+            if intersectionDistance != nil && intersectionDistance! < closestCoordinate?.distance ?? .greatestFiniteMagnitude {
                 closestCoordinate = IndexedCoordinate(coordinate: intersectionPoint!, index: (distances.0 < distances.1 ? index : index+1), distance: intersectionDistance!)
             }
         }

Tests/LinuxMain.swift

@@ -0,0 +1,6 @@
+import XCTest
+@testable import Turf
+
+XCTMain([
+    testCase(TurfTests.allTests)
+])

Turf.podspec

@@ -29,7 +29,7 @@ Pod::Spec.new do |s|
 
   # ――― Source Code ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
 
-  s.source_files = "Turf/**/*"
+  s.source_files = "Sources/**/*"
 
   # ――― Project Settings ――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #