ref: move Model manipulation logic in own Element *website*

This way no `Element` that is only there for rendering requires
any internal state.

src/content.zig

@@ -1,19 +1,56 @@
-pub fn Content(App: type) type {
+pub fn Website(App: type) type {
     return struct {
-        allocator: Allocator,
+        gpa: Allocator,
 
-        pub fn init(allocator: Allocator) @This() {
+        pub fn init(gpa: Allocator) @This() {
-            return .{
+            return .{ .gpa = gpa };
-                .allocator = allocator,
-            };
         }
 
+
         pub fn element(this: *@This()) App.Element {
             return .{
                 .ptr = this,
                 .vtable = &.{
-                    .minSize = minSize,
                     .handle = handle,
+                },
+            };
+        }
+
+        fn handle(ctx: *anyopaque, model: *App.Model, event: App.Event) !void {
+            const this: *@This() = @ptrCast(@alignCast(ctx));
+            switch (event) {
+                .about => {
+                    model.page.deinit(this.gpa);
+                    model.page = .about;
+
+                    model.document.deinit(this.gpa);
+                    model.document = .init(try std.fs.cwd().readFileAlloc(this.gpa, "./doc/about.md", std.math.maxInt(usize)));
+                },
+                .blog => |path| {
+                    model.page.deinit(this.gpa);
+                    model.document.deinit(this.gpa);
+                    errdefer {
+                        if (path) |p| this.gpa.free(p);
+                        model.document = .invalidPage;
+                        model.page = .{ .blog = null };
+                    }
+
+                    model.document = .init(try std.fs.cwd().readFileAlloc(this.gpa, if (path) |p| p else "./doc/blog.md", std.math.maxInt(usize)));
+                    model.page = .{ .blog = path };
+                },
+                else => {},
+            }
+        }
+    };
+}
+
+pub fn Content(App: type) type {
+    return struct {
+        pub fn element(this: *@This()) App.Element {
+            return .{
+                .ptr = this,
+                .vtable = &.{
+                    .minSize = minSize,
                     .content = content,
                 },
             };
@@ -25,33 +62,6 @@ pub fn Content(App: type) type {
             return .{ .y = @intCast(std.mem.count(u8, model.document.content, "\n") + 1) };
         }
 
-        fn handle(ctx: *anyopaque, model: *App.Model, event: App.Event) !void {
-            // FIX this `Element` should not handle the de-/allocation of `Model` contents!
-            const this: *@This() = @ptrCast(@alignCast(ctx));
-            switch (event) {
-                .about => {
-                    model.page.deinit(this.allocator);
-                    model.page = .about;
-
-                    model.document.deinit(this.allocator);
-                    model.document = .init(try std.fs.cwd().readFileAlloc(this.allocator, "./doc/about.md", std.math.maxInt(usize)));
-                },
-                .blog => |path| {
-                    model.page.deinit(this.allocator);
-                    model.document.deinit(this.allocator);
-                    errdefer {
-                        if (path) |p| this.allocator.free(p);
-                        model.document = .invalidPage;
-                        model.page = .{ .blog = null };
-                    }
-
-                    model.document = .init(try std.fs.cwd().readFileAlloc(this.allocator, if (path) |p| p else "./doc/blog.md", std.math.maxInt(usize)));
-                    model.page = .{ .blog = path };
-                },
-                else => {},
-            }
-        }
-
         fn content(_: *anyopaque, model: *const App.Model, cells: []zterm.Cell, size: zterm.Point) !void {
             assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
 

src/main.zig

@@ -29,13 +29,14 @@ pub fn main() !void {
     var renderer = zterm.Renderer.Buffered.init(allocator);
     defer renderer.deinit();
 
+    var website: Website = .init(allocator);
     var container = try App.Container.init(allocator, .{
         .layout = .{
             .padding = .horizontal(2),
             .direction = .vertical,
             .separator = .{ .enabled = true },
         },
-    }, .{});
+    }, website.element());
     defer container.deinit();
     var content_container: App.Container = undefined;
 
@@ -79,7 +80,7 @@ pub fn main() !void {
     }
     // main actual tui_website page content
     {
-        var content: Content = .init(allocator);
+        var content: Content = .{};
         content_container = try .init(allocator, .{}, content.element());
 
         var scrollable: App.Scrollable = .init(content_container, .enabled(.green, false));
@@ -185,6 +186,7 @@ const App = zterm.App(
 
 const contents = @import("content.zig");
 const Model = @import("model.zig");
+const Website = contents.Website(App);
 const Content = contents.Content(App);
 const Title = contents.Title(App);
 const InfoBanner = contents.InfoBanner(App);