first commit

README.md

@@ -0,0 +1 @@
+# swift-equatable

Sources/Equatable/EquatableMacro.swift

@@ -0,0 +1,8 @@
+/// A macro that produces both a value and a string containing the
+/// source code that generated the value. For example,
+///
+///     #stringify(x + y)
+///
+/// produces a tuple `(x + y, "x + y")`.
+@attached(extension, conformances: Equatable)
+public macro equatable() = #externalMacro(module: "MacroExamplesImplementation", type: "EquatableExtensionMacro")

Sources/EquatableMacros/EquatableMacro.swift → Sources/EquatableMacros/EquatableExtensionMacro.swift

@@ -12,22 +12,13 @@ import SwiftSyntaxMacros
 ///  will expand to
 ///
 ///     (x + y, "x + y")
-public struct StringifyMacro: ExpressionMacro {
-    public static func expansion(
-        of node: some FreestandingMacroExpansionSyntax,
-        in context: some MacroExpansionContext
-    ) -> ExprSyntax {
-        guard let argument = node.argumentList.first?.expression else {
-            fatalError("compiler bug: the macro does not have any arguments")
-        }
-
-        return "(\(argument), \(literal: argument.description))"
-    }
+public enum EquatableExtensionMacro: ExtensionMacro {
+
 }
 
 @main
 struct EquatablePlugin: CompilerPlugin {
     let providingMacros: [Macro.Type] = [
-        StringifyMacro.self,
+        EquatableExtensionMacro.self,
     ]
 }