Swiftformat on githooks + New swift run tools setup command (#563)

Tools/Sources/Utilities.swift

@@ -0,0 +1,37 @@
+import ArgumentParser
+import Foundation
+
+enum Utilities {
+    enum Error: LocalizedError {
+        case scriptFailed(command: String, path: String)
+
+        var errorDescription: String? {
+            switch self {
+            case let .scriptFailed(command, path):
+                return "command \(command) failed in path: \(path)"
+            }
+        }
+    }
+
+    static var projectDirectoryURL: URL { URL(filePath: FileManager.default.currentDirectoryPath) }
+
+    /// Runs a command in zsh.
+    @discardableResult
+    static func zsh(_ command: String, workingDirectoryURL: URL = projectDirectoryURL) throws -> String? {
+        let process = Process()
+        process.executableURL = URL(filePath: "/bin/zsh")
+        process.arguments = ["-c", command]
+        process.currentDirectoryURL = workingDirectoryURL
+
+        let outputPipe = Pipe()
+        process.standardOutput = outputPipe
+
+        try process.run()
+        process.waitUntilExit()
+
+        guard process.terminationReason == .exit, process.terminationStatus == 0 else { throw Error.scriptFailed(command: command, path: workingDirectoryURL.absoluteString) }
+
+        guard let outputData = try outputPipe.fileHandleForReading.readToEnd() else { return nil }
+        return String(data: outputData, encoding: .utf8)
+    }
+}