Add PreviewsMacros

Author: kabiroberai

Makefile

@@ -44,9 +44,6 @@ umbrella: umbrella-tmp
 umbrella-check: umbrella-tmp
 	@if ! cmp -s $(UMBRELLA_TMP) $(UMBRELLA_FILE); then \
 		echo "Umbrella file is out of date. Run 'make umbrella' to update it."; \
-		cat $(UMBRELLA_TMP); \
-		echo 'Current umbrella file:'; \
-		cat $(UMBRELLA_FILE); \
 		exit 1; \
 	fi
 

Package.swift

@@ -3,6 +3,10 @@
 import PackageDescription
 
 let macroTargets: [Target] = [
+    .target(
+        name: "PreviewsMacros",
+        dependencies: ["OpenAppleMacrosBase"],
+    ),
     .target(
         name: "SwiftUIMacros",
         dependencies: ["OpenAppleMacrosBase"],

Sources/OpenAppleMacrosServer/Generated/All.swift

@@ -1,9 +1,11 @@
 // Generated with `make umbrella`. Do not modify manually.
 
+import PreviewsMacros
 import SwiftDataMacros
 import SwiftUIMacros
 
 let allMacros = [
+    PreviewsMacros.all,
     SwiftDataMacros.all,
     SwiftUIMacros.all,
 ]

Sources/PreviewsMacros/Macros.swift

@@ -0,0 +1,28 @@
+import OpenAppleMacrosBase
+
+// Stub macros to allow #Preview to compile.
+// We don't actually support viewing previews through xtool.
+
+package let all: [Macro.Type] = [
+    SwiftUIView.self,
+    Previewable.self,
+]
+
+struct SwiftUIView: DeclarationMacro {
+    static func expansion(
+        of node: some FreestandingMacroExpansionSyntax, 
+        in context: some MacroExpansionContext
+    ) throws -> [DeclSyntax] {
+        return []
+    }
+}
+
+struct Previewable: PeerMacro {
+    static func expansion(
+        of node: AttributeSyntax,
+        providingPeersOf declaration: some DeclSyntaxProtocol,
+        in context: some MacroExpansionContext
+    ) throws -> [DeclSyntax] {
+        return []
+    }
+}