Fixes #165 - Enable documentation comment validation in swift-format (#188)

### Motivation

This is for better documentation
Fixes #165

### Modifications

Enabled some rules in .swift-format

### Result

The .swift-format will be changed and the rules will reflect into the
project

### Test Plan

Run tests and CI

Author: PARAIPAN9

.swift-format

@@ -16,7 +16,7 @@
   "prioritizeKeepingFunctionOutputTogether" : false,
   "respectsExistingLineBreaks" : true,
   "rules" : {
-    "AllPublicDeclarationsHaveDocumentation" : false,
+    "AllPublicDeclarationsHaveDocumentation" : true,
     "AlwaysUseLowerCamelCase" : false,
     "AmbiguousTrailingClosureOverload" : true,
     "BeginDocumentationCommentWithOneLineSummary" : false,
@@ -50,7 +50,7 @@
     "UseSynthesizedInitializer" : true,
     "UseTripleSlashForDocumentationComments" : true,
     "UseWhereClausesInForLoops" : false,
-    "ValidateDocumentationComments" : false
+    "ValidateDocumentationComments" : true
   },
   "spacesAroundRangeFormationOperators" : false,
   "tabWidth" : 8,

Examples/GreetingService/Sources/GreetingService/GreetingService.swift

@@ -32,6 +32,18 @@ struct Handler: APIProtocol {
 
 @main
 struct Main {
+    /// The entry point of the program.
+    ///
+    /// This is where the execution of the program begins. Any code you want to run
+    /// when the program starts should be placed within this method.
+    ///
+    /// Example:
+    /// ```
+    /// public static func main() {
+    ///     print("Hello, World!")
+    /// }
+    /// ```
+    /// - Throws: An error of type `Error` if there's an issue creating or running the Vapor application.
     public static func main() throws {
         // Create a Vapor application.
         let app = Vapor.Application()

Sources/PetstoreConsumerTestCore/Assertions.swift

@@ -15,6 +15,7 @@ import Foundation
 import XCTest
 import OpenAPIRuntime
 
+/// Asserts that the stringified data matches the expected string value.
 public func XCTAssertEqualStringifiedData(
     _ expression1: @autoclosure () throws -> Data?,
     _ expression2: @autoclosure () throws -> String,
@@ -33,7 +34,7 @@ public func XCTAssertEqualStringifiedData(
         XCTFail(error.localizedDescription, file: file, line: line)
     }
 }
-
+/// Asserts that the stringified data matches the expected string value.
 public func XCTAssertEqualStringifiedData<S: Sequence>(
     _ expression1: @autoclosure () throws -> S?,
     _ expression2: @autoclosure () throws -> String,
@@ -52,7 +53,7 @@ public func XCTAssertEqualStringifiedData<S: Sequence>(
         XCTFail(error.localizedDescription, file: file, line: line)
     }
 }
-
+/// Asserts that the stringified data matches the expected string value.
 public func XCTAssertEqualStringifiedData(
     _ expression1: @autoclosure () throws -> HTTPBody?,
     _ expression2: @autoclosure () throws -> String,

Sources/PetstoreConsumerTestCore/Common.swift

@@ -21,6 +21,7 @@ public enum TestError: Swift.Error, LocalizedError, CustomStringConvertible, Sen
     case unexpectedValue(any Sendable)
     case unexpectedMissingRequestBody
 
+    /// A human-readable description of the error.
     public var description: String {
         switch self {
         case .noHandlerFound(let method, let path):
@@ -34,6 +35,7 @@ public enum TestError: Swift.Error, LocalizedError, CustomStringConvertible, Sen
         }
     }
 
+    /// A localized description of the error suitable for presenting to the user.
     public var errorDescription: String? {
         description
     }

Sources/PetstoreConsumerTestCore/TestClientTransport.swift

@@ -15,18 +15,47 @@ import OpenAPIRuntime
 import Foundation
 import HTTPTypes
 
+/// A test implementation of the `ClientTransport` protocol.
+///
+/// The `TestClientTransport` struct provides a way to simulate network calls by
+/// utilizing a custom `CallHandler` closure. This allows testing the behavior of
+/// client-side API interactions in controlled scenarios.
+///
+/// Example usage:
+/// ```swift
+/// let testTransport = TestClientTransport { request, baseURL, operationID in
+///     // Simulate response logic here
+///     return Response(...)
+/// }
+///
+/// let client = APIClient(transport: testTransport)
+/// ```
 public struct TestClientTransport: ClientTransport {
 
+    /// A typealias representing a call handler closure for processing client requests.
     public typealias CallHandler = @Sendable (HTTPRequest, HTTPBody?, URL, String) async throws -> (
         HTTPResponse, HTTPBody?
     )
 
+    /// The call handler responsible for processing client requests.
     public let callHandler: CallHandler
 
+    /// Initializes a `TestClientTransport` instance with a custom call handler.
+    ///
+    /// - Parameter callHandler: The closure responsible for processing client requests.
     public init(callHandler: @escaping CallHandler) {
         self.callHandler = callHandler
     }
 
+    /// Sends a client request using the test transport.
+    ///
+    /// - Parameters:
+    ///   - request: The request to send.
+    ///   - body: The optional HTTP body to include in the request.
+    ///   - baseURL: The base URL for the request.
+    ///   - operationID: The ID of the operation being performed.
+    /// - Returns: The response received from the call handler.
+    /// - Throws: An error if the call handler encounters an issue.
     public func send(
         _ request: HTTPRequest,
         body: HTTPBody?,

Sources/PetstoreConsumerTestCore/TestServerTransport.swift

@@ -14,35 +14,77 @@
 import OpenAPIRuntime
 import HTTPTypes
 
+/// A test implementation of the `ServerTransport` protocol for simulating server-side API handling.
+///
+/// The `TestServerTransport` class allows you to define custom operations and handlers that
+/// simulate server-side API handling. This is useful for testing and verifying the behavior of
+/// your server-related code without the need for actual network interactions.
+///
+/// Example usage:
+/// ```swift
+/// let testTransport = TestServerTransport()
+/// try testTransport.register { request, metadata in
+///     // Simulate server response logic here
+///     return Response(...)
+/// }
+///
+/// let server = MyServer(transport: testTransport)
+/// ```
 public final class TestServerTransport: ServerTransport {
-
+    /// Represents the input parameters for an API operation.
     public struct OperationInputs: Equatable {
+        /// The HTTP method of the operation.
         public var method: HTTPRequest.Method
+        /// The path components of the operation's route.
         public var path: String
 
+        /// Initializes a new instance of `OperationInputs`.
+        ///
+        /// - Parameters:
+        ///   - method: The HTTP method of the operation.
+        ///   - path: The path components of the operation's route.
         public init(method: HTTPRequest.Method, path: String) {
             self.method = method
             self.path = path
         }
     }
 
+    /// A typealias representing a handler closure for processing server requests.
     public typealias Handler = @Sendable (HTTPRequest, HTTPBody?, ServerRequestMetadata) async throws -> (
         HTTPResponse, HTTPBody?
     )
 
+    /// Represents an operation with its inputs and associated handler.
     public struct Operation {
+        /// The input parameters for the API operation.
         public var inputs: OperationInputs
+        /// The closure representing the server operation logic.
         public var closure: Handler
 
+        /// Initializes a new instance of `Operation`.
+        ///
+        /// - Parameters:
+        ///   - inputs: The input parameters for the API operation.
+        ///   - closure: The closure representing the server operation logic
         public init(inputs: OperationInputs, closure: @escaping Handler) {
             self.inputs = inputs
             self.closure = closure
         }
     }
 
+    /// Initializes a new instance of `TestServerTransport`.
     public init() {}
+
+    /// The array of registered operations.
     public private(set) var registered: [Operation] = []
 
+    /// Registers a new API operation handler with specific parameters.
+    ///
+    /// - Parameters:
+    ///   - handler: The closure representing the server operation logic.
+    ///   - method: The HTTP method of the operation.
+    ///   - path: The path components of the operation.
+    /// - Throws: An error if there's an issue registering the operation.
     public func register(
         _ handler: @Sendable @escaping (HTTPRequest, HTTPBody?, ServerRequestMetadata) async throws -> (
             HTTPResponse, HTTPBody?

Sources/_OpenAPIGeneratorCore/Diagnostics.swift

@@ -142,12 +142,14 @@ public struct Diagnostic: Error, Codable, Sendable {
 }
 
 extension Diagnostic.Severity: CustomStringConvertible {
+    /// A textual representation of the diagnostic severity.
     public var description: String {
         rawValue
     }
 }
 
 extension Diagnostic: CustomStringConvertible {
+    /// A textual representation of the diagnostic, including location, severity, message, and context.
     public var description: String {
         var prefix = ""
         if let location = location {
@@ -163,6 +165,7 @@ extension Diagnostic: CustomStringConvertible {
 }
 
 extension Diagnostic: LocalizedError {
+    /// A localized description of the diagnostic.
     public var errorDescription: String? {
         description
     }
@@ -321,6 +324,9 @@ struct PrintingDiagnosticCollector: DiagnosticCollector {
     /// Creates a new collector.
     public init() {}
 
+    /// Emits a diagnostic message by printing it to the standard output.
+    ///
+    /// - Parameter diagnostic: The diagnostic message to emit.
     public func emit(_ diagnostic: Diagnostic) {
         print(diagnostic.description)
     }
@@ -331,6 +337,9 @@ public struct StdErrPrintingDiagnosticCollector: DiagnosticCollector, Sendable {
     /// Creates a new collector.
     public init() {}
 
+    /// Emits a diagnostic message to standard error.
+    ///
+    /// - Parameter diagnostic: The diagnostic message to emit.
     public func emit(_ diagnostic: Diagnostic) {
         stdErrHandle.write(diagnostic.description)
     }

Sources/_OpenAPIGeneratorCore/Extensions/Foundation.swift

@@ -30,6 +30,7 @@ extension Data {
 extension InMemoryInputFile {
     /// Creates a new in-memory file by reading the contents at the specified path.
     /// - Parameter url: The path to the file to read.
+    /// - Throws: An error if there's an issue reading the file or initializing the in-memory file.
     init(fromFileAt url: URL) throws {
         try self.init(absolutePath: url, contents: Data(contentsOf: url))
     }
@@ -50,6 +51,12 @@ extension InMemoryOutputFile {
 let stdErrHandle = FileHandle.standardError
 
 extension FileHandle: TextOutputStream {
+    /// Writes the given string to the file handle.
+    ///
+    /// This method writes the provided string to the file handle using its UTF-8
+    /// representation.
+    ///
+    /// - Parameter string: The string to be written to the file handle.
     public func write(_ string: String) {
         write(Data(string.utf8))
     }

Sources/_OpenAPIGeneratorCore/Extensions/OpenAPIKit.swift

@@ -18,6 +18,8 @@ extension Either {
     /// Returns the contained value, looking it up in the specified
     /// OpenAPI components if it contains a reference.
     /// - Parameter components: The Components section of the OpenAPI document.
+    /// - Returns: The resolved value from the `Either` instance.
+    /// - Throws: An error if there's an issue looking up the value in the components.
     func resolve(
         in components: OpenAPI.Components
     ) throws -> B where A == OpenAPI.Reference<B> {

Sources/_OpenAPIGeneratorCore/Extensions/String.swift

@@ -31,6 +31,7 @@ fileprivate extension String {
     /// Returns a copy of the string with the first letter modified by
     /// the specified closure.
     /// - Parameter transformation: A closure that modifies the first letter.
+    /// - Returns: A new string with the modified first letter, or the original string if no letter is found.
     func transformingFirstLetter<T>(_ transformation: (Character) -> T) -> String where T: StringProtocol {
         guard let firstLetterIndex = self.firstIndex(where: \.isLetter) else {
             return self