feat: Begins update for more modern swift-dependencies implementation.

Sources/CliVersion/FileClient.swift

@@ -1,10 +1,21 @@
 import Dependencies
+import DependenciesMacros
 import Foundation
 #if canImport(FoundationNetworking)
   import FoundationNetworking
 #endif
 import XCTestDynamicOverlay
 
+public extension DependencyValues {
+
+  /// Access a basic ``FileClient`` that can read / write data to the file system.
+  ///
+  var fileClient: FileClient {
+    get { self[FileClient.self] }
+    set { self[FileClient.self] = newValue }
+  }
+}
+
 /// Represents the interactions with the file system.  It is able
 /// to read from and write to files.
 ///
@@ -13,25 +24,23 @@ import XCTestDynamicOverlay
 ///  @Dependency(\.fileClient) var fileClient
 /// ```
 ///
-public struct FileClient {
+@DependencyClient
+public struct FileClient: Sendable {
+
+  public var fileExists: @Sendable (URL) -> Bool = { _ in true }
+
+  /// Read the contents of a file.
+  public var read: @Sendable (URL) throws -> String
 
   /// Write `Data` to a file `URL`.
-  public private(set) var write: (Data, URL) throws -> Void
+  public private(set) var write: @Sendable (Data, URL) throws -> Void
 
-  /// Create a new ``GitVersion/FileClient`` instance.
-  ///
-  /// This is generally not interacted with directly, instead access as a dependency.
-  ///
-  ///```swift
-  /// @Dependency(\.fileClient) var fileClient
-  ///```
+  /// Read the contents of a file at the given path.
   ///
   /// - Parameters:
-  ///   - write: Write the data to a file.
-  public init(
-    write: @escaping (Data, URL) throws -> Void
-  ) {
-    self.write = write
+  ///   - path: The file path to read from.
+  public func read(_ path: String) throws -> String {
+    try read(url(for: path))
   }
 
   /// Write's the the string to a  file path.
@@ -40,8 +49,8 @@ public struct FileClient {
   ///   - string: The string to write to the file.
   ///   - path: The file path.
   public func write(string: String, to path: String) throws {
-    let url = try url(for: path)
-    try self.write(string: string, to: url)
+    let url = url(for: path)
+    try write(string: string, to: url)
   }
 
   /// Write's the the string to a  file path.
@@ -50,49 +59,27 @@ public struct FileClient {
   ///   - string: The string to write to the file.
   ///   - url: The file url.
   public func write(string: String, to url: URL) throws {
-    try self.write(Data(string.utf8), url)
+    try write(Data(string.utf8), url)
   }
 }
 
 extension FileClient: DependencyKey {
 
   /// A ``FileClient`` that does not do anything.
-  public static let noop = FileClient.init(
+  public static let noop = FileClient(
+    fileExists: { _ in true },
+    read: { _ in "" },
     write: { _, _ in }
   )
 
   /// An `unimplemented` ``FileClient``.
-  public static let testValue = FileClient(
-    write: unimplemented("\(Self.self).write")
-  )
+  public static let testValue = FileClient()
 
   /// The live ``FileClient``
   public static let liveValue = FileClient(
+    fileExists: { FileManager.default.fileExists(atPath: $0.cleanFilePath) },
+    read: { try String(contentsOf: $0, encoding: .utf8) },
     write: { try $0.write(to: $1, options: .atomic) }
   )
 
 }
-
-extension DependencyValues {
-
-  /// Access a basic ``FileClient`` that can read / write data to the file system.
-  ///
-  public var fileClient: FileClient {
-    get { self[FileClient.self] }
-    set { self[FileClient.self] = newValue }
-  }
-}
-
-// MARK: - Private
-fileprivate func url(for path: String) throws -> URL {
-  #if os(Linux)
-    return URL(fileURLWithPath: path)
-  #else
-    if #available(macOS 13.0, *) {
-      return URL(filePath: path)
-    } else {
-      // Fallback on earlier versions
-      return URL(fileURLWithPath: path)
-    }
-  #endif
-}