Use URL(fileURLWithPath:isDirectory) to avoid file system call

Source/SwiftLintFramework/Extensions/Configuration+Cache.swift

@@ -73,10 +73,10 @@ extension Configuration {
     internal var cacheURL: URL {
         let baseURL: URL
         if let path = cachePath {
-            baseURL = URL(fileURLWithPath: path)
+            baseURL = URL(fileURLWithPath: path, isDirectory: true)
         } else {
 #if os(Linux)
-            baseURL = URL(fileURLWithPath: "/var/tmp/")
+            baseURL = URL(fileURLWithPath: "/var/tmp/", isDirectory: true)
 #else
             baseURL = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0]
 #endif

Source/SwiftLintFramework/Extensions/SwiftLintFile+Regex.swift

@@ -247,7 +247,7 @@ extension SwiftLintFile {
             queuedFatalError("can't encode '\(string)' with UTF8")
         }
         do {
-            try stringData.write(to: URL(fileURLWithPath: path), options: .atomic)
+            try stringData.write(to: URL(fileURLWithPath: path, isDirectory: false), options: .atomic)
         } catch {
             queuedFatalError("can't write file to \(path)")
         }

Source/SwiftLintFramework/Rules/Style/FileTypesOrderRule.swift

@@ -132,7 +132,8 @@ public struct FileTypesOrderRule: ConfigurationProviderRule, OptInRule {
             return self.mainTypeSubstructure(in: dict)
         }
 
-        let fileName = URL(fileURLWithPath: filePath).lastPathComponent.replacingOccurrences(of: ".swift", with: "")
+        let fileName = URL(fileURLWithPath: filePath, isDirectory: false)
+            .lastPathComponent.replacingOccurrences(of: ".swift", with: "")
         guard let mainTypeSubstructure = dict.substructure.first(where: { $0.name == fileName }) else {
             return self.mainTypeSubstructure(in: file.structureDictionary)
         }

Source/swiftlint/Commands/Docs.swift

@@ -16,7 +16,7 @@ extension SwiftLint {
 private func open(_ url: URL) {
     let process = Process()
 #if os(Linux)
-    process.executableURL = URL(fileURLWithPath: "/usr/bin/env")
+    process.executableURL = URL(fileURLWithPath: "/usr/bin/env", isDirectory: false)
     let command = "xdg-open"
     process.arguments = [command, url.absoluteString]
     try? process.run()

Source/swiftlint/Commands/GenerateDocs.swift

@@ -11,7 +11,7 @@ extension SwiftLint {
 
         mutating func run() throws {
             try RuleListDocumentation(primaryRuleList)
-                .write(to: URL(fileURLWithPath: path))
+                .write(to: URL(fileURLWithPath: path, isDirectory: true))
         }
     }
 }

Source/swiftlint/Helpers/Benchmark.swift

@@ -32,7 +32,7 @@ struct Benchmark {
             return "\(numberFormatter.string(from: NSNumber(value: time))!): \(id)"
         }
         let string: String = lines.joined(separator: "\n") + "\n"
-        let url = URL(fileURLWithPath: "benchmark_\(name)_\(timestamp).txt")
+        let url = URL(fileURLWithPath: "benchmark_\(name)_\(timestamp).txt", isDirectory: false)
         try? string.data(using: .utf8)?.write(to: url, options: [.atomic])
     }
 }

Source/swiftlint/Helpers/CompilerArgumentsExtractor.swift

@@ -87,7 +87,7 @@ extension Array where Element == String {
                 return [arg]
             }
             let responseFile = String(arg.dropFirst())
-            return (try? String(contentsOf: URL(fileURLWithPath: responseFile))).flatMap {
+            return (try? String(contentsOf: URL(fileURLWithPath: responseFile, isDirectory: false))).flatMap {
                 $0.trimmingCharacters(in: .newlines)
                   .components(separatedBy: "\n")
                   .expandingResponseFiles

Tests/SwiftLintFrameworkTests/IntegrationTests.swift

@@ -175,7 +175,8 @@ private func prepareSandbox() -> (testSwiftURL: URL, seatbeltURL: URL)? {
     //    ├── AADA6B05-2E06-4E7F-BA48-8B3AF44415E3.sb
     do {
         // `/private/tmp` is standardized to `/tmp` that is symbolic link to `/private/tmp`.
-        let temporaryDirectoryURL = URL(fileURLWithPath: "/tmp").appendingPathComponent(UUID().uuidString)
+        let temporaryDirectoryURL = URL(fileURLWithPath: "/tmp", isDirectory: true)
+            .appendingPathComponent(UUID().uuidString)
         try FileManager.default.createDirectory(at: temporaryDirectoryURL, withIntermediateDirectories: true)
 
         let seatbeltURL = temporaryDirectoryURL.appendingPathExtension("sb")

Tests/SwiftLintFrameworkTests/TestHelpers.swift

@@ -9,7 +9,7 @@ private let violationMarker = "↓"
 
 private extension SwiftLintFile {
     static func temporary(withContents contents: String) -> SwiftLintFile {
-        let url = URL(fileURLWithPath: NSTemporaryDirectory())
+        let url = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)
             .appendingPathComponent(UUID().uuidString)
             .appendingPathExtension("swift")
         _ = try? contents.data(using: .utf8)!.write(to: url)
@@ -18,7 +18,7 @@ private extension SwiftLintFile {
 
     func makeCompilerArguments() -> [String] {
         let sdk = sdkPath()
-        let frameworks = URL(fileURLWithPath: sdk)
+        let frameworks = URL(fileURLWithPath: sdk, isDirectory: true)
             .deletingLastPathComponent()
             .deletingLastPathComponent()
             .appendingPathComponent("Library")

Tests/SwiftLintFrameworkTests/XCTestCase+BundlePath.swift

@@ -3,7 +3,7 @@ import XCTest
 
 enum TestResources {
     static var path: String {
-        URL(fileURLWithPath: #file)
+        URL(fileURLWithPath: #file, isDirectory: false)
             .deletingLastPathComponent()
             .appendingPathComponent("Resources")
             .path