first version

Makefile

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+main: main.c
+	clang -o main -framework Cocoa main.c

README.md

@@ -1,2 +1,8 @@
-# osx_app_in_plain_c
+# OS X app in plain C
+
 A simple showcase how to create a simple OS X app in plain C without any Objective-C
+
+### TODO
+
+- Add autorelease pool
+- For some reason if we run the app from command line than menu is not accesible by mouse at first time

main.c

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+
+// we don't need much here
+#include <limits.h>
+#include <stdio.h>
+#include <assert.h>
+#include <objc/objc.h>
+#include <objc/runtime.h>
+#include <objc/message.h>
+#include <objc/NSObjCRuntime.h>
+
+// maybe this is available somewhere in objc runtime?
+#if __LP64__ || (TARGET_OS_EMBEDDED && !TARGET_OS_IPHONE) || TARGET_OS_WIN32 || NS_BUILD_32_LIKE_64
+#define NSIntegerEncoding "q"
+#define NSUIntegerEncoding "L"
+#else
+#define NSIntegerEncoding "i"
+#define NSUIntegerEncoding "I"
+#endif
+
+// this is how they are defined originally
+#include <CoreGraphics/CGBase.h>
+#include <CoreGraphics/CGGeometry.h>
+typedef CGPoint NSPoint;
+typedef CGRect NSRect;
+
+extern id NSApp;
+extern id const NSDefaultRunLoopMode;
+
+bool terminated = false;
+
+// we gonna create objective-c class by hand in runtime, so wow, so hacker!
+//@interface AppDelegate : NSObject<NSApplicationDelegate>
+//- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender;
+//@end
+//@implementation AppDelegate
+//- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender
+//{
+//	terminated = true;
+//	return NSTerminateCancel;
+//}
+//@end
+NSUInteger applicationShouldTerminate(id self, SEL _sel, id sender)
+{
+	printf("requested to terminate\n");
+	terminated = true;
+	return 0;
+}
+
+int main() {
+	//@autoreleasepool { // TODO ???
+
+	//[NSApplication sharedApplication];
+	((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSApplication"), sel_registerName("sharedApplication"));
+
+	//[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
+	((void (*)(id, SEL, NSInteger))objc_msgSend)(NSApp, sel_registerName("setActivationPolicy:"), 0);
+
+	//AppDelegate * dg = [[AppDelegate alloc] init];
+	Class appDelegateClass = objc_allocateClassPair((Class)objc_getClass("NSObject"), "AppDelegate", 0);
+	bool resultAddProtoc = class_addProtocol(appDelegateClass, objc_getProtocol("NSApplicationDelegate"));
+	assert(resultAddProtoc);
+	bool resultAddMethod = class_addMethod(appDelegateClass, sel_registerName("applicationShouldTerminate:"), (IMP)applicationShouldTerminate, NSUIntegerEncoding "@:@");
+	assert(resultAddMethod);
+	id dgAlloc = ((id (*)(id, SEL))objc_msgSend)((id)appDelegateClass, sel_registerName("alloc"));
+	id dg = ((id (*)(id, SEL))objc_msgSend)(dgAlloc, sel_registerName("init"));
+
+	//[NSApp setDelegate:dg];
+	((void (*)(id, SEL, id))objc_msgSend)(NSApp, sel_registerName("setDelegate:"), dg);
+
+	// not needed if we use [NSApp run]
+	//[NSApp finishLaunching];
+	((void (*)(id, SEL))objc_msgSend)(NSApp, sel_registerName("finishLaunching"));
+
+	//id menubar = [[NSMenu alloc] init];
+	id menubarAlloc = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSMenu"), sel_registerName("alloc"));
+	id menubar = ((id (*)(id, SEL))objc_msgSend)(menubarAlloc, sel_registerName("init"));
+
+	//id appMenuItem = [[NSMenuItem alloc] init];
+	id appMenuItemAlloc = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSMenuItem"), sel_registerName("alloc"));
+	id appMenuItem = ((id (*)(id, SEL))objc_msgSend)(appMenuItemAlloc, sel_registerName("init"));
+
+	//[menubar addItem:appMenuItem];
+	((void (*)(id, SEL, id))objc_msgSend)(menubar, sel_registerName("addItem:"), appMenuItem);
+
+	//[NSApp setMainMenu:menubar];
+	((id (*)(id, SEL, id))objc_msgSend)(NSApp, sel_registerName("setMainMenu:"), menubar);
+
+	//id appMenu = [[NSMenu alloc] init];
+	id appMenuAlloc = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSMenu"), sel_registerName("alloc"));
+	id appMenu = ((id (*)(id, SEL))objc_msgSend)(appMenuAlloc, sel_registerName("init"));
+
+	//id appName = [[NSProcessInfo processInfo] processName];
+	id processInfo = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSProcessInfo"), sel_registerName("processInfo"));
+	id appName = ((id (*)(id, SEL))objc_msgSend)(processInfo, sel_registerName("processName"));
+
+	//id quitTitle = [@"Quit " stringByAppendingString:appName];
+	id quitTitlePrefixStringAlloc = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSString"), sel_registerName("alloc"));
+	id quitTitlePrefixString = ((id (*)(id, SEL, const char*))objc_msgSend)(quitTitlePrefixStringAlloc, sel_registerName("initWithUTF8String:"), "Quit ");
+	id quitTitle = ((id (*)(id, SEL, id))objc_msgSend)(quitTitlePrefixString, sel_registerName("stringByAppendingString:"), appName);
+
+	//id quitMenuItem = [[NSMenuItem alloc] initWithTitle:quitTitle action:@selector(terminate:) keyEquivalent:@"q"];
+	id quitMenuItemKeyAlloc = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSString"), sel_registerName("alloc"));
+	id quitMenuItemKey = ((id (*)(id, SEL, const char*))objc_msgSend)(quitMenuItemKeyAlloc, sel_registerName("initWithUTF8String:"), "q");
+	id quitMenuItemAlloc = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSMenuItem"), sel_registerName("alloc"));
+	id quitMenuItem = ((id (*)(id, SEL, id, SEL, id))objc_msgSend)(quitMenuItemAlloc, sel_registerName("initWithTitle:action:keyEquivalent:"), quitTitle, sel_registerName("terminate:"), quitMenuItemKey);
+
+	//[appMenu addItem:quitMenuItem];
+	((void (*)(id, SEL, id))objc_msgSend)(appMenu, sel_registerName("addItem:"), quitMenuItem);
+
+	//[appMenuItem setSubmenu:appMenu];
+	((void (*)(id, SEL, id))objc_msgSend)(appMenuItem, sel_registerName("setSubmenu:"), appMenu);
+
+	//id window = [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 200, 200) styleMask:NSTitledWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask | NSResizableWindowMask backing:NSBackingStoreBuffered defer:NO];
+	NSRect rect = {{0, 0}, {200, 200}};
+	id windowAlloc = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSWindow"), sel_registerName("alloc"));
+	id window = ((id (*)(id, SEL, NSRect, NSUInteger, NSUInteger, BOOL))objc_msgSend)(windowAlloc, sel_registerName("initWithContentRect:styleMask:backing:defer:"), rect, 15, 2, NO);
+
+	//[window cascadeTopLeftFromPoint:NSMakePoint(20,20)];
+	NSPoint point = {20, 20};
+	((void (*)(id, SEL, NSPoint))objc_msgSend)(window, sel_registerName("cascadeTopLeftFromPoint:"), point);
+
+	//[window setTitle:@"sup"];
+	id titleStringAlloc = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSString"), sel_registerName("alloc"));
+	id titleString = ((id (*)(id, SEL, const char*))objc_msgSend)(titleStringAlloc, sel_registerName("initWithUTF8String:"), "sup from C");
+	((void (*)(id, SEL, id))objc_msgSend)(window, sel_registerName("setTitle:"), titleString);
+
+	//[window makeKeyAndOrderFront:window];
+	((void (*)(id, SEL, id))objc_msgSend)(window, sel_registerName("makeKeyAndOrderFront:"), window);
+
+	//[window setAcceptsMouseMovedEvents:YES];
+	((void (*)(id, SEL, BOOL))objc_msgSend)(window, sel_registerName("setAcceptsMouseMovedEvents:"), YES);
+
+	//[window setBackgroundColor:[NSColor blackColor]];
+	id blackColor = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSColor"), sel_registerName("blackColor"));
+	((void (*)(id, SEL, id))objc_msgSend)(window, sel_registerName("setBackgroundColor:"), blackColor);
+
+	// TODO do we really need this?
+	//[NSApp activateIgnoringOtherApps:YES];
+	((void (*)(id, SEL, BOOL))objc_msgSend)(NSApp, sel_registerName("activateIgnoringOtherApps:"), YES);
+
+	// explicit runloop
+	printf("entering runloop\n");
+	while(!terminated)
+	{
+		//NSEvent * event = [NSApp nextEventMatchingMask:NSAnyEventMask untilDate:[NSDate distantPast] inMode:NSDefaultRunLoopMode dequeue:YES];
+		id distantPast = ((id (*)(id, SEL))objc_msgSend)((id)objc_getClass("NSDate"), sel_registerName("distantPast"));
+		id event = ((id (*)(id, SEL, NSUInteger, id, id, BOOL))objc_msgSend)(NSApp, sel_registerName("nextEventMatchingMask:untilDate:inMode:dequeue:"), NSUIntegerMax, distantPast, NSDefaultRunLoopMode, YES);
+		if(event)
+		{
+			printf("event\n");
+			//[NSApp sendEvent:event];
+			((void (*)(id, SEL, id))objc_msgSend)(NSApp, sel_registerName("sendEvent:"), event);
+
+			//[NSApp updateWindows];
+			((void (*)(id, SEL))objc_msgSend)(NSApp, sel_registerName("updateWindows"));
+		}
+
+		// do runloop stuff
+	}
+
+	// or optionally you can use default run loop, and don't forget to disable [NSApp finishLaunching] then
+	//[NSApp run];
+	//((void (*)(id, SEL))objc_msgSend)(NSApp, sel_registerName("run"));
+
+	printf("gracefully terminated\n");
+
+	// } // TODO
+	return 0;
+}
+