diff --git a/CMakeLists.txt b/CMakeLists.txt
index f2af117..9316a1b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,10 +12,12 @@ if (WIN32)
         set(PROJECT_ARCH x86)
         add_definitions(-DWIN32)
     endif ()
-    add_executable(cerberus WIN32 src/main.c)
+    add_executable(cerberus WIN32 src/main.h src/main.c)
 elseif (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+    # does not work, use Xcode to build
+    # TODO use makefile instead of cmake?
     add_definitions(-DMACOS)
-    add_executable(cerberus src/main.c)
+    add_executable(cerberus src/main.h src/main.m)
     include_directories(/usr/include)
     link_directories()
 elseif(UNIX)
diff --git a/src/main.c b/src/main.c
index c96bca4..8e55abd 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,4 @@
-#define WINDOW_X 0
-#define WINDOW_Y 0
-#define WINDOW_WIDTH 350
-#define WINDOW_HEIGHT 250
+#include "main.h"
 
 #ifdef WIN64
 
@@ -56,169 +53,4 @@ LRESULT CALLBACK WndProc(HWND hwnd, UINT msg,
 	return DefWindowProcW(hwnd, msg, wParam, lParam);
 }
 
-#elif defined MACOS
-
-//original objective-c
-//
-//#import <Cocoa/Cocoa.h>
-//int main ()
-//{
-//	@autoreleasepool{
-//		[NSApplication sharedApplication];
-//		[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
-//		id applicationName = [[NSProcessInfo processInfo] processName];
-//		id window = [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 120, 120)
-//		styleMask:NSTitledWindowMask backing:NSBackingStoreBuffered defer:NO];
-//		[window cascadeTopLeftFromPoint:NSMakePoint(20,20)];
-//		[window setTitle: applicationName];
-//		[window makeKeyAndOrderFront:nil];
-//		[NSApp activateIgnoringOtherApps:YES];
-//		[NSApp run];
-//	}
-//	return 0;
-//}
-
-// $ clang minimal.c -framework Cocoa -o minimal.app
-
-#include <objc/runtime.h>
-#include <objc/message.h>
-
-#include <Carbon/Carbon.h>
-
-#define cls objc_getClass
-#define sel sel_getUid
-#define msg ((id (*)(id, SEL, ...))objc_msgSend)
-#define cls_msg ((id (*)(Class, SEL, ...))objc_msgSend)
-
-// poor man's bindings!
-typedef enum NSApplicationActivationPolicy {
-	NSApplicationActivationPolicyRegular   = 0,
-	NSApplicationActivationPolicyAccessory = 1,
-	NSApplicationActivationPolicyERROR     = 2,
-} NSApplicationActivationPolicy;
-
-typedef enum NSWindowStyleMask {
-	NSWindowStyleMaskBorderless     = 0,
-	NSWindowStyleMaskTitled         = 1 << 0,
-	NSWindowStyleMaskClosable       = 1 << 1,
-	NSWindowStyleMaskMiniaturizable = 1 << 2,
-	NSWindowStyleMaskResizable      = 1 << 3,
-} NSWindowStyleMask;
-
-typedef enum NSBackingStoreType {
-	NSBackingStoreBuffered = 2,
-} NSBackingStoreType;
-
-int main(int argc, char *argv[])
-{
-	// id app = [NSApplication sharedApplication];
-	id app = cls_msg(cls("NSApplication"), sel("sharedApplication"));
-
-	// [app setActivationPolicy:NSApplicationActivationPolicyRegular];
-	msg(app, sel("setActivationPolicy:"), NSApplicationActivationPolicyRegular);
-
-	struct CGRect frameRect = {0, 0, 600, 500};
-
-	// id window = [[NSWindow alloc] initWithContentRect:frameRect styleMask:NSWindowStyleMaskTitled|NSWindowStyleMaskClosable|NSWindowStyleMaskResizable backing:NSBackingStoreBuffered defer:NO];
-	id window = msg(cls_msg(cls("NSWindow"), sel("alloc")),
-									sel("initWithContentRect:styleMask:backing:defer:"),
-									frameRect,
-									NSWindowStyleMaskTitled|NSWindowStyleMaskClosable|NSWindowStyleMaskResizable,
-									NSBackingStoreBuffered,
-									false);
-	msg(window, sel("setTitle:"), cls_msg(cls("NSString"), sel("stringWithUTF8String:"), "Pure C App"));
-
-	// [window makeKeyAndOrderFront:nil];
-	msg(window, sel("makeKeyAndOrderFront:"), nil);
-
-	// [app activateIgnoringOtherApps:YES];
-	msg(app, sel("activateIgnoringOtherApps:"), true);
-
-	msg(app, sel("run"));
-}
-
-//
-//#include <objc/runtime.h>
-//#include <objc/message.h>
-//
-//#include <Carbon/Carbon.h>
-//
-//#define cls objc_getClass
-//#define sel sel_getUid
-//#define msg ((id (*)(id, SEL, ...))objc_msgSend)
-//#define cls_msg ((id (*)(Class, SEL, ...))objc_msgSend)
-//
-//// poor man's bindings!
-//typedef enum NSApplicationActivationPolicy {
-//	NSApplicationActivationPolicyRegular   = 0,
-//	NSApplicationActivationPolicyAccessory = 1,
-//	NSApplicationActivationPolicyERROR     = 2,
-//} NSApplicationActivationPolicy;
-//
-//typedef enum NSWindowStyleMask {
-//	NSWindowStyleMaskBorderless     = 0,
-//	NSWindowStyleMaskTitled         = 1 << 0,
-//	NSWindowStyleMaskClosable       = 1 << 1,
-//	NSWindowStyleMaskMiniaturizable = 1 << 2,
-//	NSWindowStyleMaskResizable      = 1 << 3,
-//} NSWindowStyleMask;
-//
-//typedef enum NSBackingStoreType {
-//	NSBackingStoreBuffered = 2,
-//} NSBackingStoreType;
-//
-//int main(int argc, char *argv[])
-//{
-//	// id app = [NSApplication sharedApplication];
-//	id app = cls_msg(
-//		cls("NSApplication"),
-//		sel("sharedApplication")
-//	);
-//
-//	// [app setActivationPolicy:NSApplicationActivationPolicyRegular];
-//	msg(
-//		app,
-//		sel("setActivationPolicy:"),
-//		NSApplicationActivationPolicyRegular
-//	);
-//
-//	struct CGRect frameRect = {
-//		WINDOW_X,
-//		WINDOW_Y,
-//		WINDOW_WIDTH,
-//		WINDOW_HEIGHT
-//	};
-//
-//	id applicationName = msg(
-//		cls_msg(
-//			cls("NSProcessInfo"),
-//			sel("processInfo")
-//		),
-//		sel("processName")
-//	);
-//
-//	// id window = [[NSWindow alloc] initWithContentRect:frameRect styleMask:NSWindowStyleMaskTitled|NSWindowStyleMaskClosable|NSWindowStyleMaskResizable backing:NSBackingStoreBuffered defer:NO];
-//	id window = msg(
-//		cls_msg(cls("NSWindow"), sel("alloc")),
-//		sel("initWithContentRect:styleMask:backing:defer:"),
-//			frameRect,
-//			NSWindowStyleMaskTitled|NSWindowStyleMaskClosable|NSWindowStyleMaskResizable,
-//			NSBackingStoreBuffered,
-//			false
-//	);
-//
-//	printf("%p\n", window);
-//	msg(window, sel("setTitle:"), applicationName);
-
-	// [window makeKeyAndOrderFront:nil];
-	//msg(window, sel("makeKeyAndOrderFront:"), nil);
-
-	// [app activateIgnoringOtherApps:YES];
-	//msg(app, sel("activateIgnoringOtherApps:"), true);
-
-	//msg(app, sel("run"));
-//}
-
-// https://stackoverflow.com/questions/30269329/creating-window-application-in-pure-c-on-mac-osx
-
 #endif
diff --git a/src/main.m b/src/main.m
index c4fc250..dcffc62 100644
--- a/src/main.m
+++ b/src/main.m
@@ -1,19 +1,19 @@
 #import <Cocoa/Cocoa.h>
 #import "main.h"
 
-int main ()
-{
-    @autoreleasepool{
-        [NSApplication sharedApplication];
-        [NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
-        id applicationName = [[NSProcessInfo processInfo] processName];
-        id window = [[NSWindow alloc] initWithContentRect:NSMakeRect(WINDOW_X, WINDOW_Y, WINDOW_WIDTH, WINDOW_HEIGHT)
-                                                styleMask:NSWindowStyleMaskTitled backing:NSBackingStoreBuffered defer:NO];
-        [window cascadeTopLeftFromPoint:NSMakePoint(20,20)];
-        [window setTitle: applicationName];
-        [window makeKeyAndOrderFront:nil];
-        [NSApp activateIgnoringOtherApps:YES];
-        [NSApp run];
-    }
-    return 0;
+int main() {
+	// https://stackoverflow.com/questions/30269329/creating-window-application-in-pure-c-on-mac-osx
+	@autoreleasepool {
+		[NSApplication sharedApplication];
+		[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
+		id applicationName = [[NSProcessInfo processInfo] processName];
+		id window = [[NSWindow alloc] initWithContentRect:NSMakeRect(WINDOW_X, WINDOW_Y, WINDOW_WIDTH, WINDOW_HEIGHT)
+																						styleMask:NSWindowStyleMaskTitled backing:NSBackingStoreBuffered defer:NO];
+		[window cascadeTopLeftFromPoint:NSMakePoint(20, 20)];
+		[window setTitle:applicationName];
+		[window makeKeyAndOrderFront:nil];
+		[NSApp activateIgnoringOtherApps:YES];
+		[NSApp run];
+	}
+	return 0;
 }