From 873192318f1e814fa2ec67392f102db9bd7607a8 Mon Sep 17 00:00:00 2001
From: Dietrich Epp <depp@zdome.net>
Date: Thu, 20 Apr 2023 21:41:31 -0400
Subject: [PATCH] Show open dialog for open menu item

---
 lib/defs.h   |  6 ++++++
 macos/main.c | 19 ++++++++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/lib/defs.h b/lib/defs.h
index 8774a4b..cb1527c 100644
--- a/lib/defs.h
+++ b/lib/defs.h
@@ -128,6 +128,12 @@ Boolean ResizeHandle(Handle h, Size newSize);
 // Fill memory with zeroes.
 void MemClear(void *ptr, Size size);
 
+// =============================================================================
+// Utility Macros
+// =============================================================================
+
+#define ARRAY_COUNT(x) (sizeof(x) / sizeof(*(x)))
+
 // =============================================================================
 // Assertions
 // =============================================================================
diff --git a/macos/main.c b/macos/main.c
index 51e0fb9..83599f0 100644
--- a/macos/main.c
+++ b/macos/main.c
@@ -3,10 +3,13 @@
 // Mozilla Public License, version 2.0. See LICENSE.txt for details.
 #include "macos/main.h"
 
+#include "lib/defs.h"
 #include "macos/error.h"
 #include "macos/project.h"
 #include "macos/resources.h"
 
+#include <StandardFile.h>
+
 #ifndef __MWERKS__
 // Link error if defined with CodeWarrior.
 QDGlobals qd;
@@ -17,6 +20,17 @@ void QuitApp(void)
 	ExitToShell();
 }
 
+// kFileTypes is a list of all file types that we can open.
+static const OSType kFileTypes[] = {kTypeProject};
+
+// HandleOpen handles the Open menu command.
+static void HandleOpen(void)
+{
+	StandardFileReply sfreply;
+
+	StandardGetFile(NULL, ARRAY_COUNT(kFileTypes), kFileTypes, &sfreply);
+}
+
 // HandleClose handles a request to close the given window.
 static void HandleClose(WindowRef window)
 {
@@ -57,7 +71,7 @@ static void AdjustMenus(void)
 
 	if (fileMenu != NULL) {
 		EnableItem(fileMenu, iFile_New);
-		DisableItem(fileMenu, iFile_Open);
+		EnableItem(fileMenu, iFile_Open);
 		if (!hasDocument) {
 			DisableItem(fileMenu, iFile_Close);
 			DisableItem(fileMenu, iFile_Save);
@@ -95,6 +109,9 @@ static void HandleMenuCommand(long command)
 		case iFile_New:
 			ProjectNew();
 			return;
+		case iFile_Open:
+			HandleOpen();
+			return;
 		case iFile_Quit:
 			QuitApp();
 			return;