Initial swiftlint file and fixes

.swiftlint.yml

@@ -0,0 +1,68 @@
+included:
+  - Sources
+  - Tests
+  - Package.swift
+excluded:
+  - Tests/Fixtures
+  - Tests/AccessibilityTests/AccessibilityProject
+  - Tests/XcodeTests/UIKitProject
+
+# Enabled/disabled rules
+analyzer_rules:
+  - all
+opt_in_rules:
+  - all
+disabled_rules:
+  - anyobject_protocol
+  - inert_defer
+  - unused_capture_list  
+  - explicit_acl
+  - explicit_type_interface
+  - missing_docs
+  - required_deinit
+  - line_length
+  - type_contents_order
+  - prefer_nimble
+  - explicit_top_level_acl
+  - anonymous_argument_in_multiline_closure
+  - one_declaration_per_file
+  - conditional_returns_on_newline
+  - vertical_whitespace_between_cases
+  - no_grouping_extension
+  - explicit_enum_raw_value
+  - file_types_order
+  - indentation_width
+  - identifier_name
+  - trailing_closure
+  - multiline_arguments_brackets  
+  - multiline_function_chains
+  - no_extension_access_modifier
+  - force_try
+  - switch_case_on_newline
+  - sorted_enum_cases
+  - prefer_self_in_static_references
+  - superfluous_else
+  - force_unwrapping
+  - file_name
+  - todo
+  - no_magic_numbers
+  - prefixed_toplevel_constant
+  - untyped_error_in_catch
+  - cyclomatic_complexity
+  - closure_body_length
+  - function_body_length
+  - type_body_length
+  - file_length  
+  - contrasted_opening_brace
+  - unused_parameter
+  - no_empty_block
+  - prefer_key_path
+
+balanced_xctest_lifecycle: &unit_test_configuration
+  test_parent_classes:
+    - SourceGraphTestCase
+    - FixtureSourceGraphTestCase    
+    - XCTestCase
+empty_xctest_method: *unit_test_configuration
+final_test_case: *unit_test_configuration
+single_test_class: *unit_test_configuration

Sources/Frontend/Commands/CheckUpdateCommand.swift

@@ -1,5 +1,5 @@
-import Foundation
 import ArgumentParser
+import Foundation
 import Shared
 
 struct CheckUpdateCommand: FrontendCommand {

Sources/Frontend/Commands/ClearCacheCommand.swift

@@ -1,5 +1,5 @@
-import Foundation
 import ArgumentParser
+import Foundation
 import Shared
 
 struct ClearCacheCommand: FrontendCommand {

Sources/Frontend/Commands/ScanBehavior.swift

@@ -1,7 +1,7 @@
 import Foundation
-import SystemPackage
-import Shared
 import PeripheryKit
+import Shared
+import SystemPackage
 
 final class ScanBehavior {
     private let configuration: Configuration
@@ -16,7 +16,7 @@ final class ScanBehavior {
         do {
             var path: FilePath?
 
-            if let configPath = configPath {
+            if let configPath {
                 path = FilePath(configPath)
             }
             try configuration.load(from: path)
@@ -90,7 +90,7 @@ final class ScanBehavior {
             logger.info(output, canQuiet: false)
             logger.endInterval(interval)
 
-            if filteredResults.count > 0,
+            if !filteredResults.isEmpty,
                 configuration.outputFormat.supportsAuxiliaryOutput {
                 logger.info(
                     colorize("\n* ", .boldGreen) +

Sources/Frontend/Commands/ScanCommand.swift

@@ -1,7 +1,7 @@
-import Foundation
 import ArgumentParser
-import SystemPackage
+import Foundation
 import Shared
+import SystemPackage
 
 struct ScanCommand: FrontendCommand {
     static let configuration = CommandConfiguration(

Sources/Frontend/Commands/VersionCommand.swift

@@ -1,5 +1,5 @@
-import Foundation
 import ArgumentParser
+import Foundation
 
 struct VersionCommand: FrontendCommand {
     static let configuration = CommandConfiguration(

Sources/Frontend/Project.swift

@@ -1,7 +1,7 @@
 import Foundation
-import SystemPackage
 import PeripheryKit
 import Shared
+import SystemPackage
 
 #if canImport(XcodeSupport)
 import XcodeSupport

Sources/Frontend/SPMProjectSetupGuide.swift

@@ -1,7 +1,7 @@
 import Foundation
-import SystemPackage
 import PeripheryKit
 import Shared
+import SystemPackage
 
 final class SPMProjectSetupGuide: SetupGuideHelpers, ProjectSetupGuide {
     private let configuration: Configuration
@@ -51,5 +51,4 @@ final class SPMProjectSetupGuide: SetupGuideHelpers, ProjectSetupGuide {
         let targetNames = targets.map { $0.name }.sorted()
         return select(multiple: targetNames, allowAll: true)
     }
-
 }

Sources/Frontend/Scan.swift

@@ -1,6 +1,6 @@
 import Foundation
-import Shared
 import PeripheryKit
+import Shared
 import SourceGraph
 
 final class Scan {

Sources/Frontend/UpdateChecker.swift

@@ -39,9 +39,10 @@ final class UpdateChecker {
         urlRequest.setValue("application/vnd.github.v3+json", forHTTPHeaderField: "Accept")
 
         let task = urlSession.dataTask(with: urlRequest) { [weak self] data, _, error in
+            // swiftlint:disable:next self_binding
             guard let strongSelf = self else { return }
 
-            if let error = error {
+            if let error {
                 strongSelf.debugLogger.debug("error: \(error.localizedDescription)")
                 strongSelf.error = error
                 strongSelf.semaphore.signal()
@@ -53,8 +54,11 @@ final class UpdateChecker {
                 let tagName = jsonObject["tag_name"] as? String else {
                     var json = "N/A"
 
-                    if let data = data {
-                        json = String(data: data, encoding: .utf8) ?? "N/A"
+                    if let data {
+                        let decoded = String(decoding: data, as: UTF8.self)
+                        if !decoded.isEmpty {
+                            json = decoded
+                        }
                     }
 
                     let message = "Failed to identify latest release tag in: \(json)"
@@ -72,7 +76,7 @@ final class UpdateChecker {
     }
 
     func notifyIfAvailable() {
-        guard let latestVersion = latestVersion else { return }
+        guard let latestVersion else { return }
 
         debugLogger.debug("latest: \(latestVersion)")
 
@@ -91,15 +95,15 @@ final class UpdateChecker {
     func wait() -> Result<String, PeripheryError> {
         let waitResult = semaphore.wait(timeout: .now() + 60)
 
-        if let error = error {
+        if let error {
             return .failure(.underlyingError(error))
         }
 
         if waitResult == .timedOut {
             return .failure(PeripheryError.updateCheckError(message: "Timed out while checking for update."))
         }
 
-        if let latestVersion = latestVersion {
+        if let latestVersion {
             return .success(latestVersion)
         }
 

Sources/Frontend/main.swift

@@ -1,5 +1,5 @@
-import Foundation
 import ArgumentParser
+import Foundation
 import Shared
 
 Logger.configureBuffering()

Sources/Indexer/Indexer.swift

@@ -1,7 +1,7 @@
+import FilenameMatcher
 import Foundation
-import SystemPackage
 import Shared
-import FilenameMatcher
+import SystemPackage
 
 public class Indexer {
     private let configuration: Configuration

Sources/Indexer/InfoPlistIndexer.swift

@@ -1,6 +1,6 @@
 import Shared
-import SystemPackage
 import SourceGraph
+import SystemPackage
 
 public final class InfoPlistIndexer: Indexer {
     private let infoPlistFiles: Set<FilePath>
@@ -19,15 +19,15 @@ public final class InfoPlistIndexer: Indexer {
         excludedFiles.forEach { self.logger.debug("Excluding \($0.string)") }
 
         try JobPool(jobs: Array(includedFiles)).forEach { [weak self] path in
-            guard let self = self else { return }
+            guard let self else { return }
 
             let elapsed = try Benchmark.measure {
                 try InfoPlistParser(path: path)
                     .parse()
-                    .forEach { self.graph.add($0)  }
+                    .forEach { self.graph.add($0) }
             }
 
-            self.logger.debug("\(path.string) (\(elapsed)s)")
+            logger.debug("\(path.string) (\(elapsed)s)")
         }
     }
 }

Sources/Indexer/InfoPlistParser.swift

@@ -1,13 +1,14 @@
-import Foundation
-import SystemPackage
 import AEXML
+import Foundation
 import Shared
 import SourceGraph
+import SystemPackage
 
 final class InfoPlistParser {
     private static let elements = [
         "UISceneClassName", "UISceneDelegateClassName", "NSPrincipalClass",
-        "NSExtensionPrincipalClass", "CLKComplicationPrincipalClass", "WKExtensionDelegateClassName"]
+        "NSExtensionPrincipalClass", "CLKComplicationPrincipalClass", "WKExtensionDelegateClassName"
+    ]
     private let path: FilePath
 
     required init(path: FilePath) {

Sources/Indexer/JobPool.swift

@@ -18,7 +18,7 @@ struct JobPool<T> {
             }
         }
 
-        if let error = error {
+        if let error {
             throw error
         }
     }
@@ -43,7 +43,7 @@ struct JobPool<T> {
             }
         }
 
-        if let error = error {
+        if let error {
             throw error
         }
 

Sources/Indexer/SwiftIndexer.swift

@@ -1,9 +1,9 @@
 import Foundation
-import SwiftIndexStore
-import SystemPackage
 import Shared
 import SourceGraph
+import SwiftIndexStore
 import SyntaxAnalysis
+import SystemPackage
 
 public final class SwiftIndexer: Indexer {
     private let sourceFiles: [FilePath: Set<IndexTarget>]
@@ -39,6 +39,7 @@ public final class SwiftIndexer: Indexer {
                 let indexStore = try IndexStore.open(store: URL(fileURLWithPath: indexStorePath.string), lib: .open())
                 let units = indexStore.units(includeSystem: false)
 
+                // swiftlint:disable:next large_tuple
                 return try units.compactMap { unit -> (FilePath, IndexStore, IndexStoreUnit)? in
                     guard let filePath = try indexStore.mainFilePath(for: unit) else { return nil }
 
@@ -71,8 +72,8 @@ public final class SwiftIndexer: Indexer {
             retainedFiles = allSourceFiles.filter { configuration.retainFilesMatchers.anyMatch(filename: $0.string) }
         }
 
-        let jobs = unitsByFile.map { (file, units) -> Job in
-            return Job(
+        let jobs = unitsByFile.map { file, units -> Job in
+            Job(
                 file: file,
                 units: units,
                 retainAllDeclarations: retainedFiles.contains(file),
@@ -128,7 +129,6 @@ public final class SwiftIndexer: Indexer {
             graph: SourceGraph,
             logger: ContextualLogger,
             configuration: Configuration
-
         ) {
             self.file = file
             self.units = units
@@ -138,6 +138,7 @@ public final class SwiftIndexer: Indexer {
             self.configuration = configuration
         }
 
+        // swiftlint:disable nesting
         struct RawRelation {
             struct Symbol {
                 let name: String?
@@ -170,6 +171,7 @@ public final class SwiftIndexer: Indexer {
                 Key(kind: kind, name: name, isImplicit: isImplicit, isObjcAccessible: isObjcAccessible, location: location)
             }
         }
+        // swiftlint:enable nesting
 
         /// Phase one reads the index store and establishes the declaration hierarchy and the majority of references.
         /// Some references may depend upon declarations in other files, and thus their association is deferred until
@@ -280,7 +282,7 @@ public final class SwiftIndexer: Indexer {
         private func getSourceFile() throws -> SourceFile {
             if let sourceFile { return sourceFile }
 
-            let modules = try units.reduce(into: Set<String>()) { (set, tuple) in
+            let modules = try units.reduce(into: Set<String>()) { set, tuple in
                 let (indexStore, unit) = tuple
                 if let name = try indexStore.moduleName(for: unit) {
                     set.insert(name)
@@ -340,11 +342,11 @@ public final class SwiftIndexer: Indexer {
 
             let explicitDeclarations = declarations.filter { !$0.isImplicit }
             let declsByLocation = explicitDeclarations
-                .reduce(into: [Location: [Declaration]]()) { (result, decl) in
+                .reduce(into: [Location: [Declaration]]()) { result, decl in
                     result[decl.location, default: []].append(decl)
                 }
             let declsByLine = explicitDeclarations
-                .reduce(into: [Int: [Declaration]]()) { (result, decl) in
+                .reduce(into: [Int: [Declaration]]()) { result, decl in
                     result[decl.location.line, default: []].append(decl)
                 }
             let sortedDeclLines = declsByLine.keys.sorted().reversed()
@@ -370,7 +372,7 @@ public final class SwiftIndexer: Indexer {
                 // a decl without a parent, as the reference may be a related type of a class/struct/etc.
                 if let decl = candidateDecls.first(where: { $0.parent == nil }) {
                     associate(ref, with: decl)
-                } else if let decl = candidateDecls.sorted().first {
+                } else if let decl = candidateDecls.min() {
                     // Fallback to using the first declaration.
                     // Sorting the declarations helps in the situation where the candidate declarations includes a
                     // property/subscript, and a getter on the same line. The property/subscript is more likely to be
@@ -694,7 +696,7 @@ public final class SwiftIndexer: Indexer {
         }
 
         private func transformLocation(_ input: IndexStoreOccurrence.Location) throws -> Location? {
-            return Location(file: try getSourceFile(), line: Int(input.line), column: Int(input.column))
+            Location(file: try getSourceFile(), line: Int(input.line), column: Int(input.column))
         }
 
         private func transformDeclarationKind(_ kind: IndexStoreSymbol.Kind, _ subKind: IndexStoreSymbol.SubKind) -> Declaration.Kind? {