Enable `direct_return` rule in the repository

.swiftlint.yml

@@ -15,7 +15,6 @@ disabled_rules:
   - closure_body_length
   - conditional_returns_on_newline
   - convenience_type
-  - direct_return
   - discouraged_optional_collection
   - explicit_acl
   - explicit_enum_raw_value

Source/SwiftLintFramework/Extensions/Dictionary+SwiftLint.swift

@@ -137,9 +137,8 @@ public struct SourceKittenDictionary {
     /// The fully preserved SourceKitten dictionaries for all the attributes associated with this dictionary.
     var swiftAttributes: [SourceKittenDictionary] {
         let array = value["key.attributes"] as? [SourceKitRepresentable] ?? []
-        let dictionaries = array.compactMap { $0 as? [String: SourceKitRepresentable] }
+        return array.compactMap { $0 as? [String: SourceKitRepresentable] }
             .map(Self.init)
-        return dictionaries
     }
 
     var elements: [SourceKittenDictionary] {

Source/SwiftLintFramework/Extensions/SwiftLintFile+Regex.swift

@@ -270,13 +270,12 @@ extension SwiftLintFile {
     internal func ruleEnabled(violatingRanges: [NSRange], for rule: Rule) -> [NSRange] {
         let fileRegions = regions()
         if fileRegions.isEmpty { return violatingRanges }
-        let violatingRanges = violatingRanges.filter { range in
+        return violatingRanges.filter { range in
             let region = fileRegions.first {
                 $0.contains(Location(file: self, characterOffset: range.location))
             }
             return region?.isRuleEnabled(rule) ?? true
         }
-        return violatingRanges
     }
 
     internal func ruleEnabled(violatingRange: NSRange, for rule: Rule) -> NSRange? {

Source/SwiftLintFramework/Rules/Idiomatic/ExtensionAccessModifierRule.swift

@@ -157,9 +157,7 @@ struct ExtensionAccessModifierRule: ASTRule, ConfigurationProviderRule, OptInRul
             // attributeBuiltin (`final` for example) tokens between them
             let length = typeOffset - previousInternalByteRange.location
             let range = ByteRange(location: previousInternalByteRange.location, length: length)
-            let internalBelongsToType = Set(file.syntaxMap.kinds(inByteRange: range)) == [.attributeBuiltin]
-
-            return internalBelongsToType
+            return Set(file.syntaxMap.kinds(inByteRange: range)) == [.attributeBuiltin]
         }
 
         return violationOffsets.map {

Source/SwiftLintFramework/Rules/Idiomatic/NimbleOperatorRule.swift

@@ -114,12 +114,10 @@ struct NimbleOperatorRule: ConfigurationProviderRule, OptInRule, CorrectableRule
                 return false
             }
 
-            let containsCall = file.structureDictionary.structures(forByteOffset: byteRange.upperBound - 1)
+            return file.structureDictionary.structures(forByteOffset: byteRange.upperBound - 1)
                 .contains(where: { dict -> Bool in
                     return dict.expressionKind == .call && (dict.name ?? "").starts(with: "expect")
                 })
-
-            return containsCall
         }
     }
 

Source/SwiftLintFramework/Rules/Idiomatic/RedundantTypeAnnotationRule.swift

@@ -110,7 +110,7 @@ struct RedundantTypeAnnotationRule: OptInRule, SubstitutionCorrectableRule, Conf
     }
 
     func violationRanges(in file: SwiftLintFile) -> [NSRange] {
-        let violatingRanges = file
+        return file
             .match(pattern: expressionPattern)
             .filter {
                 $0.1 == [.keyword, .identifier, .typeidentifier, .identifier] ||
@@ -122,8 +122,6 @@ struct RedundantTypeAnnotationRule: OptInRule, SubstitutionCorrectableRule, Conf
                 file.match(pattern: typeAnnotationPattern,
                            excludingSyntaxKinds: SyntaxKind.commentAndStringKinds, range: $0.0).first
             }
-
-        return violatingRanges
     }
 
     private func isFalsePositive(file: SwiftLintFile, range: NSRange) -> Bool {

Source/SwiftLintFramework/Rules/Metrics/FileLengthRule.swift

@@ -23,10 +23,9 @@ struct FileLengthRule: ConfigurationProviderRule {
     func validate(file: SwiftLintFile) -> [StyleViolation] {
         func lineCountWithoutComments() -> Int {
             let commentKinds = SyntaxKind.commentKinds
-            let lineCount = file.syntaxKindsByLines.filter { kinds in
+            return file.syntaxKindsByLines.filter { kinds in
                 return !Set(kinds).isSubset(of: commentKinds)
             }.count
-            return lineCount
         }
 
         var lineCount = file.lines.count

Source/SwiftLintFramework/Rules/Style/ClosureEndIndentationRule.swift

@@ -205,11 +205,9 @@ extension ClosureEndIndentationRule {
             closureArguments.removeLast()
         }
 
-        let argumentViolations = closureArguments.compactMap { dictionary in
+        return closureArguments.compactMap { dictionary in
             return validateClosureArgument(in: file, dictionary: dictionary)
         }
-
-        return argumentViolations
     }
 
     private func validateClosureArgument(in file: SwiftLintFile,

Source/SwiftLintFramework/Rules/Style/OpeningBraceRule.swift

@@ -234,9 +234,8 @@ struct OpeningBraceRule: CorrectableRule, ConfigurationProviderRule {
         }
 
         if let indexRange = contents.nsrangeToIndexRange(adjustedRange) {
-            let correctedContents = contents
+            return contents
                 .replacingCharacters(in: indexRange, with: correctString)
-            return correctedContents
         } else {
             return contents
         }

Source/SwiftLintFramework/Rules/Style/StatementPositionRule.swift

@@ -179,9 +179,7 @@ private extension StatementPositionRule {
         let validator = Self.uncuddledMatchValidator(contents: contents)
         let filterMatches = Self.uncuddledMatchFilter(contents: contents, syntaxMap: syntaxMap)
 
-        let validMatches = matches.compactMap(validator).filter(filterMatches).map({ $0.range })
-
-        return validMatches
+        return matches.compactMap(validator).filter(filterMatches).map({ $0.range })
     }
 
     func uncuddledCorrect(file: SwiftLintFile) -> [Correction] {

Source/SwiftLintFramework/Rules/Style/VerticalWhitespaceBetweenCasesRule.swift

@@ -132,8 +132,7 @@ struct VerticalWhitespaceBetweenCasesRule: ConfigurationProviderRule {
 
         let matchFirstRange = matchResult.range(at: 1)
         let matchFirstString = substring.substring(from: matchFirstRange.location, length: matchFirstRange.length)
-        let isAllWhitespace = matchFirstString.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
-        return isAllWhitespace
+        return matchFirstString.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
     }
 }