Add empty package with basic dependencies

.pre-commit-config.yaml

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+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.5.0
+    hooks:
+    -   id: trailing-whitespace
+    -   id: end-of-file-fixer
+    -   id: check-yaml
+    -   id: check-added-large-files
+    -   id: detect-private-key
+    -   id: check-merge-conflict
+-   repo: https://github.com/hodovani/pre-commit-swift
+    rev: master
+    hooks:
+    -   id: swift-lint
+    -   id: swift-format

.swiftformat

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+--indent 2
+--indentcase false
+--trimwhitespace always
+--nospaceoperators
+--empty tuple
+--operatorfunc nospace
+--ifdef noindent
+--stripunusedargs closure-only
+--disable andOperator
+--swiftversion 5.2

.swiftlint.yml

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+disabled_rules:
+  - trailing_comma
+  - identifier_name
+  - void_return
+  - operator_whitespace
+  - nesting
+  - cyclomatic_complexity
+
+line_length: 100
+
+function_body_length: 50
+
+included:
+  - Sources
+  - Tests

.vscode/settings.json

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+{
+  "editor.tabSize": 2,
+  "editor.formatOnSave": true,
+  "editor.formatOnType": true
+}

Package.resolved

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+{
+  "object": {
+    "pins": [
+      {
+        "package": "SKQueue",
+        "repositoryURL": "https://github.com/daniel-pedersen/SKQueue.git",
+        "state": {
+          "branch": null,
+          "revision": "a52c15ea2a8f28fde607155cf75c1abe9ea000a7",
+          "version": "1.2.0"
+        }
+      },
+      {
+        "package": "swift-argument-parser",
+        "repositoryURL": "https://github.com/apple/swift-argument-parser",
+        "state": {
+          "branch": null,
+          "revision": "9f04d1ff1afbccd02279338a2c91e5f27c45e93a",
+          "version": "0.0.5"
+        }
+      },
+      {
+        "package": "swift-nio",
+        "repositoryURL": "https://github.com/apple/swift-nio.git",
+        "state": {
+          "branch": null,
+          "revision": "e876fb37410e0036b98b5361bb18e6854739572b",
+          "version": "2.16.0"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Package.swift

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+// swift-tools-version:5.2
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+  name: "carton",
+  dependencies: [
+    .package(url: "https://github.com/apple/swift-argument-parser", .upToNextMinor(from: "0.0.5")),
+    .package(url: "https://github.com/apple/swift-nio.git", from: "2.16.0"),
+    .package(url: "https://github.com/daniel-pedersen/SKQueue.git", from: "1.2.0"),
+  ],
+  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: "carton",
+      dependencies: []
+    ),
+    .testTarget(
+      name: "CartonTests",
+      dependencies: ["carton"]
+    ),
+  ]
+)

README.md

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+# carton
+
+A description of this package.

Sources/carton/main.swift

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+print("Hello, world!")

Tests/LinuxMain.swift

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+import CartonTests
+import XCTest
+
+var tests = [XCTestCaseEntry]()
+tests += CartonTests.allTests()
+XCTMain(tests)

Tests/cartonTests/XCTestManifests.swift

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+import XCTest
+
+#if !canImport(ObjectiveC)
+public func allTests() -> [XCTestCaseEntry] {
+  [
+    testCase(CartonTests.allTests),
+  ]
+}
+#endif

Tests/cartonTests/cartonTests.swift

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+import class Foundation.Bundle
+import XCTest
+
+final class CartonTests: XCTestCase {
+  func testExample() throws {
+    // This is an example of a functional test case.
+    // Use XCTAssert and related functions to verify your tests produce the correct
+    // results.
+
+    // Some of the APIs that we use below are available in macOS 10.13 and above.
+    guard #available(macOS 10.13, *) else {
+      return
+    }
+
+    let fooBinary = productsDirectory.appendingPathComponent("carton")
+
+    let process = Process()
+    process.executableURL = fooBinary
+
+    let pipe = Pipe()
+    process.standardOutput = pipe
+
+    try process.run()
+    process.waitUntilExit()
+
+    let data = pipe.fileHandleForReading.readDataToEndOfFile()
+    let output = String(data: data, encoding: .utf8)
+
+    XCTAssertEqual(output, "Hello, world!\n")
+  }
+
+  /// Returns path to the built products directory.
+  var productsDirectory: URL {
+    #if os(macOS)
+    for bundle in Bundle.allBundles where bundle.bundlePath.hasSuffix(".xctest") {
+      return bundle.bundleURL.deletingLastPathComponent()
+    }
+    fatalError("couldn't find the products directory")
+    #else
+    return Bundle.main.bundleURL
+    #endif
+  }
+
+  static var allTests = [
+    ("testExample", testExample),
+  ]
+}