SideStore/Plugins/LoggerPlugin/LoggerPlugin.swift

// Copyright 2022 The Brave Authors. All rights reserved.
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

import PackagePlugin
import Foundation

@main
struct LoggerPlugin: BuildToolPlugin {
	func createBuildCommands(context: PluginContext, target: Target) async throws -> [Command] {
		let outputDirectory = context.pluginWorkDirectory.appending("GeneratedSources")
		guard let target = target as? SourceModuleTarget else {
			Diagnostics.error("Attempted to use `LoggerPlugin` on an unsupported module target")
			return []
		}

		try FileManager.default.createDirectory(atPath: outputDirectory.string, withIntermediateDirectories: true)
		let source = """
		import Foundation
		import os.log

		extension Logger {
		  static var module: Logger {
			.init(subsystem: "\\(Bundle.main.bundleIdentifier ?? "com.sidestore.ios")", category: "\(target.moduleName)")
		  }
		}
		"""

		let filePath = outputDirectory.appending("logger.swift")
		if !FileManager.default.fileExists(atPath: filePath.string) {
			try source.write(
				toFile: filePath.string,
				atomically: true,
				encoding: .utf8
			)
		}
		// TODO: Generate the above file in an `executableTarget` when SPM supports building Mac tools while targetting iOS
		return [
			.buildCommand(
				displayName: "Generate logger",
				executable: Path("/bin/zsh"),
				arguments: [],
				outputFiles: [outputDirectory.appending("logger.swift")]
			)
		]
	}
}