Add Swift Package Manager support

.gitignore

@@ -33,3 +33,8 @@ DerivedData
 # Carthage/Checkouts
 
 Carthage/Build
+
+# Swift Package Manager
+.build/
+.swiftpm/
+Packages/

.swift-version

@@ -1 +1 @@
-4.1
+5.1

.travis.yml

@@ -1,5 +1,5 @@
 osx_image: xcode11
-language: objective-c
+language: swift
 env:
   global:
   - LC_CTYPE=en_US.UTF-8
@@ -9,6 +9,7 @@ before_install:
 install: echo "<3"
 env:
   - MODE=framework
+  - MODE=spm
   - MODE=examples
 script: ./build.sh $MODE
 

LinuxMain.swift

@@ -0,0 +1,8 @@
+import XCTest
+
+import ZipTests
+
+var tests = [XCTestCaseEntry]()
+tests += ZipTests.__allTests()
+
+XCTMain(tests)

Package.swift

@@ -0,0 +1,29 @@
+// swift-tools-version:5.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+import PackageDescription
+
+let package = Package(
+    name: "Zip",
+    products: [
+        .library(name: "Zip", targets: ["Zip"])
+    ],
+    targets: [
+        .target(
+            name: "Minizip",
+            dependencies: [],
+            path: "Zip/minizip",
+            exclude: ["module"],
+            linkerSettings: [
+                .linkedLibrary("z")
+            ]),
+        .target(
+            name: "Zip",
+            dependencies: ["Minizip"],
+            path: "Zip",
+            exclude: ["minizip", "zlib"]),
+        .testTarget(
+            name: "ZipTests",
+            dependencies: ["Zip"],
+            path: "ZipTests"),
+    ]
+)

Package@swift-4.2.swift

@@ -0,0 +1,30 @@
+// 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: "Zip",
+    products: [
+        .library(name: "Zip", targets: ["Zip"])
+    ],
+    targets: [
+        .systemLibrary(
+            name: "CZlib",
+            path: "Zip/zlib",
+            pkgConfig: "zlib"),
+        .target(
+            name: "Minizip",
+            dependencies: ["CZlib"],
+            path: "Zip/minizip",
+            exclude: ["module"]),
+        .target(
+            name: "Zip",
+            dependencies: ["Minizip"],
+            path: "Zip",
+            exclude: ["minizip", "zlib"]),
+        .testTarget(
+            name: "ZipTests",
+            dependencies: ["Zip"],
+            path: "ZipTests"),
+    ]
+)

Package@swift-5.0.swift

@@ -0,0 +1,29 @@
+// swift-tools-version:5.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+import PackageDescription
+
+let package = Package(
+    name: "Zip",
+    products: [
+        .library(name: "Zip", targets: ["Zip"])
+    ],
+    targets: [
+        .target(
+            name: "Minizip",
+            dependencies: [],
+            path: "Zip/minizip",
+            exclude: ["module"],
+            linkerSettings: [
+                .linkedLibrary("z")
+            ]),
+        .target(
+            name: "Zip",
+            dependencies: ["Minizip"],
+            path: "Zip",
+            exclude: ["minizip", "zlib"]),
+        .testTarget(
+            name: "ZipTests",
+            dependencies: ["Zip"],
+            path: "ZipTests"),
+    ]
+)

README.md

@@ -1,7 +1,7 @@
 ![Zip - Zip and unzip files in Swift](https://cloud.githubusercontent.com/assets/889949/12374908/252373d0-bcac-11e5-8ece-6933aeae8222.png)
 
-[![Build Status](https://travis-ci.org/marmelroy/Zip.svg?branch=master)](https://travis-ci.org/marmelroy/Zip) [![Version](http://img.shields.io/cocoapods/v/Zip.svg)](http://cocoapods.org/?q=Zip)
-[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
+[![Build Status](https://travis-ci.org/marmelroy/Zip.svg?branch=master)](https://travis-ci.org/marmelroy/Zip) [![Version](http://img.shields.io/cocoapods/v/Zip.svg)](http://cocoapods.org/?q=Zip) [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage) [![SPM supported](https://img.shields.io/badge/SPM-supported-brightgreen.svg?style=flat)](https://swift.org/package-manager)
+
 
 # Zip
 A Swift 4.0 framework for zipping and unzipping files. Simple and quick to use. Built on top of [minizip](https://github.com/nmoinvaz/minizip).
@@ -53,7 +53,7 @@ catch {
 ## Custom File Extensions
 
 Zip supports '.zip' and '.cbz' files out of the box. To support additional zip-derivative file extensions:
-```
+```swift
 Zip.addCustomFileExtension("file-extension-here")
 ```
 
@@ -63,19 +63,15 @@ source 'https://github.com/CocoaPods/Specs.git'
 pod 'Zip', '~> 1.1'
 ```
 
-### Setting up with Carthage
-
-[Carthage](https://github.com/Carthage/Carthage) is a decentralized dependency manager that automates the process of adding frameworks to your Cocoa application.
-
-You can install Carthage with [Homebrew](http://brew.sh/) using the following command:
-
-```bash
-$ brew update
-$ brew install carthage
-```
-
+### Setting up with [Carthage](https://github.com/Carthage/Carthage)
 To integrate Zip into your Xcode project using Carthage, specify it in your `Cartfile`:
 
 ```ogdl
-github "marmelroy/Zip"
+github "marmelroy/Zip" ~> 1.1
+```
+
+### Setting up with [Swift Package Manager](https://swift.org/package-manager)
+To use Zip with Swift Package Manager, add it to your package's dependencies:
+```swift
+.package(url: "https://github.com/marmelroy/Zip.git", .upToNextMinor(from: "1.1.0"))
 ```