SwiftLint/Plugins/SwiftLintCommandPlugin/SwiftLintCommandPlugin.swift

import Foundation
import PackagePlugin

@main
struct SwiftLintCommandPlugin: CommandPlugin {
    func performCommand(
        context: PluginContext,
        arguments: [String]
    ) throws {
        let tool: PluginContext.Tool = try context.tool(named: "swiftlint")
        // Caching is managed internally because the cache must be located within the `pluginWorkDirectory`.
        if arguments.contains("--cache-path") {
            Diagnostics.error("Setting Cache Path Not Allowed")
            return
        }
        let process: Process = .init()
        process.currentDirectoryURL = URL(fileURLWithPath: context.package.directory.string)
        process.executableURL = URL(fileURLWithPath: tool.path.string)
        // The analyze command does not support the `--cache-path` argument
        if arguments.contains("analyze") {
            process.arguments = arguments
        } else {
            process.arguments = arguments + ["--cache-path", "\(context.pluginWorkDirectory.string)"]
        }
        try process.run()
        process.waitUntilExit()
        switch process.terminationReason {
        case .exit:
            break
        case .uncaughtSignal:
            Diagnostics.error("Uncaught Signal")
        @unknown default:
            Diagnostics.error("Unexpected Termination Reason")
        }
        guard process.terminationStatus == EXIT_SUCCESS else {
            Diagnostics.error("Command Failed")
            return
        }
    }
}