mod(main): improve ergonomics of example src/main.zig implementation

src/main.zig

@@ -7,6 +7,8 @@ const App = zterm.App(
     true,
 );
 const Key = zterm.Key;
+const Layout = App.Layout;
+const Widget = App.Widget;
 
 const log = std.log.scoped(.default);
 
@@ -28,22 +30,27 @@ pub fn main() !void {
     // FIX: when not running fullscreen, the application needs to screen down accordingly to display the contents
     // -> size hint how much should it use?
 
-    const mainFile = try std.fs.cwd().openFile("./src/main.zig", .{});
-    var mainFileText = App.Widget.RawText.init(allocator, mainFile);
-    mainFile.close();
-
-    const appFile = try std.fs.cwd().openFile("./src/app.zig", .{});
-    var appFileText = App.Widget.RawText.init(allocator, appFile);
-    appFile.close();
-
-    var spacer = App.Widget.Spacer.init();
-    // TODO: corresponding contents need to be filled out by the layout accordingly!
-    var vstack = App.Layout.VStack.init(allocator, .{
-        App.Widget.createFrom(&appFileText),
-        App.Widget.createFrom(&spacer),
-        App.Widget.createFrom(&mainFileText),
+    var layout = Layout.createFrom(layout: {
+        var vstack = Layout.VStack.init(allocator, .{
+            Widget.createFrom(blk: {
+                const file = try std.fs.cwd().openFile("./src/app.zig", .{});
+                defer file.close();
+                var widget = Widget.RawText.init(allocator, file);
+                break :blk &widget;
+            }),
+            Widget.createFrom(blk: {
+                var spacer = Widget.Spacer.init();
+                break :blk &spacer;
+            }),
+            Widget.createFrom(blk: {
+                const file = try std.fs.cwd().openFile("./src/main.zig", .{});
+                defer file.close();
+                var widget = Widget.RawText.init(allocator, file);
+                break :blk &widget;
+            }),
+        });
+        break :layout &vstack;
     });
-    var layout = App.Layout.createFrom(&vstack);
     defer layout.deinit();
 
     try app.start();