Use Shwift library instead of Subprocess

Shwift has a concise API, which makes writing shell code nice and easy.
This is an opinionated decision.

Package.resolved

@@ -1,5 +1,5 @@
 {
-  "originHash" : "fd1e824e418c767633bb79b055a4e84d9c86165746bc881d5d27457ad34b0c20",
+  "originHash" : "0cb2e87817f52021ac25ffee6b27396f6d94e9fd604ca83db7f20a10e65fe6cf",
   "pins" : [
     {
       "identity" : "noora",
@@ -28,6 +28,15 @@
         "version" : "4.2.1"
       }
     },
+    {
+      "identity" : "shwift",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/GeorgeLyon/Shwift",
+      "state" : {
+        "revision" : "d7be04898d094ddce6140cc6a2e9a83fc994b66d",
+        "version" : "3.1.1"
+      }
+    },
     {
       "identity" : "swift-argument-parser",
       "kind" : "remoteSourceControl",
@@ -37,15 +46,6 @@
         "version" : "1.7.0"
       }
     },
-    {
-      "identity" : "swift-async-algorithms",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/apple/swift-async-algorithms",
-      "state" : {
-        "revision" : "9d349bcc328ac3c31ce40e746b5882742a0d1272",
-        "version" : "1.1.3"
-      }
-    },
     {
       "identity" : "swift-atomics",
       "kind" : "remoteSourceControl",
@@ -82,15 +82,6 @@
         "version" : "2.95.0"
       }
     },
-    {
-      "identity" : "swift-subprocess",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/swiftlang/swift-subprocess.git",
-      "state" : {
-        "revision" : "ba5888ad7758cbcbe7abebac37860b1652af2d9c",
-        "version" : "0.3.0"
-      }
-    },
     {
       "identity" : "swift-system",
       "kind" : "remoteSourceControl",

Package.swift

@@ -11,12 +11,10 @@ let package = Package(
 		)
 	],
 	dependencies: [
-		.package(url: "https://github.com/apple/swift-argument-parser", from: "1.7.0"),
-		.package(url: "https://github.com/apple/swift-async-algorithms", from: "1.1.3"),
 		.package(url: "https://github.com/apple/swift-log", from: "1.10.1"),
 		.package(url: "https://github.com/apple/swift-nio", from: "2.95.0"),
 		.package(url: "https://github.com/apple/swift-system", from: "1.6.4"),
-		.package(url: "https://github.com/swiftlang/swift-subprocess.git", from: "0.3.0"),
+		.package(url: "https://github.com/GeorgeLyon/Shwift", from: "3.1.1"),
 		.package(url: "https://github.com/tuist/Noora", from: "0.55.1")
 	],
 	targets: [
@@ -40,11 +38,9 @@ let package = Package(
 		.executableTarget(
 			name: "InotifyTaskCLI",
 			dependencies: [
-				.product(name: "ArgumentParser", package: "swift-argument-parser"),
-				.product(name: "AsyncAlgorithms", package: "swift-async-algorithms"),
 				.product(name: "Logging", package: "swift-log"),
 				.product(name: "_NIOFileSystem", package: "swift-nio"),
-				.product(name: "Subprocess", package: "swift-subprocess"),
+				.product(name: "Script", package: "Shwift"),
 				.product(name: "Noora", package: "Noora")
 			],
 			path: "Sources/TaskCLI"

Sources/TaskCLI/Command.swift

@@ -1,4 +1,4 @@
-import ArgumentParser
+import Script
 
 @main
 struct Command: AsyncParsableCommand {

Sources/TaskCLI/GenerateDocumentation Command.swift

@@ -1,11 +1,9 @@
-import ArgumentParser
-import AsyncAlgorithms
 import Foundation
 import Logging
+import Script
 import Noora
-import Subprocess
 
-struct GenerateDocumentationCommand: AsyncParsableCommand {
+struct GenerateDocumentationCommand: Script {
 	static let configuration = CommandConfiguration(
 		commandName: "generate-documentation",
 		abstract: "Generate DocC documentation of all targets inside a Linux container.",
@@ -25,6 +23,7 @@ struct GenerateDocumentationCommand: AsyncParsableCommand {
 		let logger = global.makeLogger(labeled: "swift-inotify.cli.task.generate-documentation")
 		let fileManager = FileManager.default
 		let projectDirectory = URL(fileURLWithPath: fileManager.currentDirectoryPath)
+		let docker = try await executable(named: "docker")
 
 		let targets = try await Self.targets(for: projectDirectory)
 
@@ -43,28 +42,16 @@ struct GenerateDocumentationCommand: AsyncParsableCommand {
 		let script = Self.makeRunScript(for: targets)
 
 		logger.debug("Container script", metadata: ["script": "\(script)"])
-		let dockerResult = try await Subprocess.run(
+		do {
-			.name("docker"),
+			try await docker(
-			arguments: [
 				"run", "--rm",
-				"-v", "\(tempDirectory.path(percentEncoded: false)):/code",
+				"-v", "\(tempDirectory.path):/code",
 				"--platform", "linux/arm64",
 				"-w", "/code",
 				"swift:latest",
 				"/bin/bash", "-c", script,
-			],
+			)
-			preferredBufferSize: 10,
+		} catch {
-		) { execution, standardInput, standardOutput, standardError in
-			print("")
-			let stdout = standardOutput.lines()
-			let stderr = standardError.lines()
-			for try await line in merge(stdout, stderr) {
-				noora.passthrough("\(line)")
-			}
-			print("")
-		}
-
-		guard dockerResult.terminationStatus.isSuccess else {
 			noora.error("Documentation generation failed.")
 			return
 		}
@@ -116,11 +103,10 @@ struct GenerateDocumentationCommand: AsyncParsableCommand {
 	}
 
 	private static func packageTargets() async throws -> [(name: String, path: String)] {
-		let packageDescription = try await Subprocess.run(
+		let swift = try await executable(named: "swift")
-			.name("swift"),
+		let packageDescriptionOutput = try await outputOf {
-			arguments: ["package", "describe", "--type", "json"],
+			try await swift("package", "describe", "--type", "json")
-			output: .data(limit: 20_000)
+		}
-		)
 
 		struct PackageDescription: Codable {
 			let targets: [Target]
@@ -130,7 +116,8 @@ struct GenerateDocumentationCommand: AsyncParsableCommand {
 			let path: String
 		}
 
-		let package = try JSONDecoder().decode(PackageDescription.self, from: packageDescription.standardOutput)
+		let data = Data(packageDescriptionOutput.utf8)
+		let package = try JSONDecoder().decode(PackageDescription.self, from: data)
 		return package.targets.map { ($0.name, $0.path) }
 	}
 
@@ -175,15 +162,13 @@ struct GenerateDocumentationCommand: AsyncParsableCommand {
 	// MARK: - Dependency Injection
 
 	private func injectDoccPluginDependency(in directory: URL, logger: Logger) async throws {
-		let result = try await Subprocess.run(
+		let swift = try await executable(named: "swift")
-			.name("swift"),
+		do {
-			arguments: [
+			try await swift(
 				"package", "--package-path", directory.path(percentEncoded: false),
 				"add-dependency", "--from", Self.doccPluginMinVersion, Self.doccPluginURL
-			],
+			)
-		) { _ in }
+		} catch {
-
-		guard result.terminationStatus.isSuccess else {
 			throw GenerateDocumentationError.dependencyInjectionFailed
 		}
 

Sources/TaskCLI/Global Options.swift

@@ -1,4 +1,4 @@
-import ArgumentParser
+import Script
 import Logging
 
 struct GlobalOptions: ParsableArguments {

Sources/TaskCLI/Test Command.swift

@@ -1,10 +1,8 @@
-import ArgumentParser
-import AsyncAlgorithms
 import Foundation
-import Subprocess
+import Script
 import Noora
 
-struct TestCommand: AsyncParsableCommand {
+struct TestCommand: Script {
 	static let configuration = CommandConfiguration(
 		commandName: "test",
 		abstract: "Run swift test in a linux container.",
@@ -19,26 +17,21 @@ struct TestCommand: AsyncParsableCommand {
 		let noora = Noora()
 		let logger = global.makeLogger(labeled: "swift-inotify.cli.task.test")
 		let currentDirectory = FileManager.default.currentDirectoryPath
+		let docker = Executable(path: "/opt/homebrew/bin/docker")
 
 		noora.info("Running tests on Linux.")
 		logger.debug("Current directory", metadata: ["current-directory": "\(currentDirectory)"])
-		async let monitorResult = Subprocess.run(
+		do {
-			.name("docker"),
+			try await docker(
-			arguments: ["run", "-v", "\(currentDirectory):/code", "--security-opt", "systempaths=unconfined", "--platform", "linux/arm64", "-w", "/code", "swift:latest", "/bin/bash", "-c", "swift test --skip InotifyLimitTests; swift test --skip-build --filter InotifyLimitTests"],
+				"run",
-			preferredBufferSize: 10,
+				"-v", "\(currentDirectory):/code",
-		) { execution, standardInput, standardOutput, standardError in
+				"--security-opt", "systempaths=unconfined",
-			print("")
+				"--platform", "linux/arm64",
-			let stdout = standardOutput.lines()
+				"-w", "/code", "swift:latest",
-			let stderr = standardError.lines()
+				"/bin/bash", "-c", "swift test --skip InotifyLimitTests; swift test --skip-build --filter InotifyLimitTests"
-			for try await line in merge(stdout, stderr) {
+			)
-				noora.passthrough("\(line)")
-			}
-			print("")
-		}
-
-		if (try await monitorResult.terminationStatus.isSuccess) {
 			noora.success("All tests completed successfully.")
-		} else {
+		} catch {
 			noora.error("Not all tests completed successfully.")
 		}
 	}