Localizable macro

Sources/Localizable/Localizable.swift

@@ -0,0 +1,45 @@
+import Foundation
+
+/// Generates type-safe localized strings from enum cases.
+///
+/// - Parameter bundle:
+///   Optional `Bundle` used to resolve localized strings.
+///
+/// Enum cases without associated values become `static let`
+/// constants. Cases with associated values become `static func`
+/// methods that interpolate arguments. If a String Catalog is
+/// used, each key is automatically added to the catalog. By
+/// default, the main bundle is used to resolve strings.
+///
+/// ```swift
+/// import Localizable
+///
+/// extension String {
+///     @Localizable enum Login {
+///         private enum Strings {
+///             case welcome
+///             case title(String)
+///             case message(msg1: String, msg2: Int)
+///         }
+///     }
+/// }
+/// ```
+///
+/// Expands to members of `String.Login`:
+///
+/// ```swift
+/// static let welcome = String(localized: "Login.welcome")
+///
+/// static func title(_ value0: String) -> String {
+///     String(localized: "Login.title \(value0)")
+/// }
+///
+/// static func message(msg1: String, msg2: Int) -> String {
+///     String(localized: "Login.message \(msg1) \(msg2)")
+/// }
+/// ```
+@attached(member, names: arbitrary)
+public macro Localizable(bundle: Bundle? = nil) = #externalMacro(
+    module: "LocalizableMacros",
+    type: "LocalizableMacro"
+)