01a

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

Package.resolved

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+{
+  "object": {
+    "pins": [
+      {
+        "package": "swift-collections",
+        "repositoryURL": "https://github.com/apple/swift-collections.git",
+        "state": {
+          "branch": null,
+          "revision": "48254824bb4248676bf7ce56014ff57b142b77eb",
+          "version": "1.0.2"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Package.swift

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+// swift-tools-version:5.5
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "aoc2021",
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+        .package(
+              url: "https://github.com/apple/swift-collections.git",
+              .upToNextMajor(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 this package depends on.
+        .executableTarget(
+            name: "aoc2021",
+            dependencies: [
+                .product(name: "Collections", package: "swift-collections")
+            ],
+            resources: [
+                .process("Resources"),
+            ]
+        ),
+        .testTarget(
+            name: "aoc2021Tests",
+            dependencies: ["aoc2021"]),
+    ]
+)

README.md

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+# aoc2021
+
+A description of this package.

Sources/aoc2021/01.swift

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+//
+//  File.swift
+//  
+//
+//  Created by Max Nuding on 01.12.21.
+//
+
+import Foundation
+struct Day01 {
+    let inputPath: String
+    func run() {
+        let input = try! String(contentsOfFile: inputPath)
+        let measurements = input
+            .split(separator: "\n")
+            .compactMap { Int32($0) }
+            .reduce((currentCount: 0, lastValue: Int32.max)) { partialResult, currentValue in
+                let increaseBy = currentValue > partialResult.lastValue ? 1 : 0
+                return (currentCount: partialResult.currentCount + increaseBy, lastValue: currentValue)
+            }
+        print(measurements.currentCount)
+    }
+}

Sources/aoc2021/main.swift

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+import Foundation
+
+print("Starting day 01")
+let input01 = Bundle.module.path(forResource: "01", ofType: ".txt")!
+let start = CFAbsoluteTimeGetCurrent()
+Day01(inputPath: input01).run()
+let end = CFAbsoluteTimeGetCurrent()
+let execTimeMs = round((end - start) * 1000.0 * 100.0) / 100.0
+print("Finished in \(execTimeMs)ms")

Tests/aoc2021Tests/aoc2021Tests.swift

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+import XCTest
+import class Foundation.Bundle
+
+final class aoc2021Tests: 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
+        }
+
+        // Mac Catalyst won't have `Process`, but it is supported for executables.
+        #if !targetEnvironment(macCatalyst)
+
+        let fooBinary = productsDirectory.appendingPathComponent("aoc2021")
+
+        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")
+        #endif
+    }
+
+    /// 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
+    }
+}