Make a document-based application

Add the basic necessities for a document-based application. This is what
I came up with on 2023-09-10. The `DocumentWindowController` was just an
initial idea and doesn't do anything: we create the required window
controller in `Document`.

The `CFBundleDocumentTypes` entry enables us to interact with text
files.

This confirms that the "Open Recent" menu does get added automatically
below the "Open" menu.

4 files changed, 57 insertions, 0 deletions

diff --git a/src/Document.h b/src/Document.h
new file mode 100644
index 0000000..e566ac0
--- /dev/null
+++ b/src/Document.h
@@ -0,0 +1,4 @@
+#import <Cocoa/Cocoa.h>
+
+@interface Document : NSDocument
+@end
diff --git a/src/Document.m b/src/Document.m
new file mode 100644
index 0000000..7b514eb
--- /dev/null
+++ b/src/Document.m
@@ -0,0 +1,38 @@
+#import "Document.h"
+
+@implementation Document
+
+- (id)init
+{
+	self = [super init];
+	if (self) {
+	}
+	return self;
+}
+
+// TODO: Are window controllers deallocated automatically by the parent?
+// [[NSWindowController alloc] initWithWindow:]?
+
+- (void)makeWindowControllers
+{
+	// DocumentWindowController *controller = [[DocumentWindowController alloc] init];
+
+	NSWindow *window = [[NSWindow alloc]
+		initWithContentRect:NSMakeRect(0, 0, 600, 500)
+		styleMask:
+			NSWindowStyleMaskTitled
+			| NSWindowStyleMaskClosable
+			| NSWindowStyleMaskMiniaturizable
+			| NSWindowStyleMaskResizable
+		backing:NSBackingStoreBuffered
+		defer:NO];
+	// [window setFrameAutosaveName:@"document"]; // document name?
+
+	NSWindowController *window_controller = [[NSWindowController alloc]
+		initWithWindow:window];
+	// [window_controller setShouldCascadeWindows:YES];
+
+	[self addWindowController:window_controller];
+}
+
+@end
diff --git a/src/DocumentWindowController.h b/src/DocumentWindowController.h
new file mode 100644
index 0000000..e3b277b
--- /dev/null
+++ b/src/DocumentWindowController.h
@@ -0,0 +1,4 @@
+#import <Cocoa/Cocoa.h>
+
+@interface DocumentWindowController : NSWindowController
+@end
diff --git a/src/DocumentWindowController.m b/src/DocumentWindowController.m
new file mode 100644
index 0000000..e83af36
--- /dev/null
+++ b/src/DocumentWindowController.m
@@ -0,0 +1,11 @@
+#import "DocumentWindowController.h"
+
+@implementation DocumentWindowController
+
+- (void)windowWillLoad
+{
+	// NSWindow *window = ;
+	// self = [self initWithWindow:window];
+}
+
+@end