first commit

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/

Package.swift

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+// swift-tools-version:5.3
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "LineCounter",
+    platforms: [
+        .macOS(.v10_15)
+    ],
+    products: [
+        .executable(name: "lc", targets: ["LineCounter"])
+    ],
+    targets: [
+        .target(
+            name: "LineCounter",
+            dependencies: []),
+        .testTarget(
+            name: "LineCounterTests",
+            dependencies: ["LineCounter"]),
+    ]
+)

Sources/LineCounter/main.swift

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+//
+//  main.swift
+//  LineCounter
+//
+//  Created by ky0me22 on 2021/04/21.
+//
+
+import Foundation
+
+guard CommandLine.arguments.count == 2 else {
+    print("usage: lc [absolute path of a file]")
+    exit(1)
+}
+
+let fileUrl = URL(fileURLWithPath: CommandLine.arguments[1])
+guard let file = try? String(contentsOf: fileUrl, encoding: .utf8) else {
+    print("Error: could not read \(fileUrl.absoluteString)")
+    exit(2)
+}
+
+print(file.components(separatedBy: CharacterSet.newlines).count)

Sources/LineCounter/manual.swift

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+//
+//  File.swift
+//  
+//
+//  Created by ky0me22 on 2021/04/21.
+//
+
+let manual = """
+Usage:
+  lc [-p <arg>...] [options]
+  lc -h|--help
+
+Options:
+
+  -p, --path PATH            Specify an absolute path for the file or directory
+
+  -e, --extension EXTENSION  Specify a file extension for which you want to
+                             count the number of lines
+"""

Tests/LineCounterTests/LineCounterTests.swift

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+import XCTest
+import class Foundation.Bundle
+
+final class LineCounterTests: 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("LineCounter")
+
+        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),
+    ]
+}

Tests/LineCounterTests/XCTestManifests.swift

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

Tests/LinuxMain.swift

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