Allow dumping the project diagnostic view's state as JSON

Also, improve DebugElements action so that it shows the JSON in an editor.

Co-authored-by: Nathan Sobo <nathan@zed.dev>

crates/gpui/src/app.rs

@@ -62,6 +62,9 @@ pub trait View: Entity + Sized {
         cx.set.insert(Self::ui_name().into());
         cx
     }
+    fn debug_json(&self, _: &AppContext) -> serde_json::Value {
+        serde_json::Value::Null
+    }
 }
 
 pub trait ReadModel {
@@ -2277,6 +2280,12 @@ pub struct AppContext {
 }
 
 impl AppContext {
+    pub(crate) fn root_view(&self, window_id: usize) -> Option<AnyViewHandle> {
+        self.windows
+            .get(&window_id)
+            .map(|window| window.root_view.clone())
+    }
+
     pub fn root_view_id(&self, window_id: usize) -> Option<usize> {
         self.windows
             .get(&window_id)
@@ -2590,6 +2599,7 @@ pub trait AnyView {
     fn on_focus(&mut self, cx: &mut MutableAppContext, window_id: usize, view_id: usize);
     fn on_blur(&mut self, cx: &mut MutableAppContext, window_id: usize, view_id: usize);
     fn keymap_context(&self, cx: &AppContext) -> keymap::Context;
+    fn debug_json(&self, cx: &AppContext) -> serde_json::Value;
 }
 
 impl<T> AnyView for T
@@ -2653,6 +2663,10 @@ where
     fn keymap_context(&self, cx: &AppContext) -> keymap::Context {
         View::keymap_context(self, cx)
     }
+
+    fn debug_json(&self, cx: &AppContext) -> serde_json::Value {
+        View::debug_json(self, cx)
+    }
 }
 
 pub struct ModelContext<'a, T: ?Sized> {
@@ -3927,6 +3941,12 @@ impl AnyViewHandle {
     pub fn view_type(&self) -> TypeId {
         self.view_type
     }
+
+    pub fn debug_json(&self, cx: &AppContext) -> serde_json::Value {
+        cx.views
+            .get(&(self.window_id, self.view_id))
+            .map_or_else(|| serde_json::Value::Null, |view| view.debug_json(cx))
+    }
 }
 
 impl Clone for AnyViewHandle {

crates/gpui/src/presenter.rs

@@ -209,15 +209,18 @@ impl Presenter {
     }
 
     pub fn debug_elements(&self, cx: &AppContext) -> Option<json::Value> {
-        cx.root_view_id(self.window_id)
-            .and_then(|root_view_id| self.rendered_views.get(&root_view_id))
-            .map(|root_element| {
-                root_element.debug(&DebugContext {
-                    rendered_views: &self.rendered_views,
-                    font_cache: &self.font_cache,
-                    app: cx,
+        let view = cx.root_view(self.window_id)?;
+        Some(json!({
+            "root_view": view.debug_json(cx),
+            "root_element": self.rendered_views.get(&view.id())
+                .map(|root_element| {
+                    root_element.debug(&DebugContext {
+                        rendered_views: &self.rendered_views,
+                        font_cache: &self.font_cache,
+                        app: cx,
+                    })
                 })
-            })
+        }))
     }
 }
 
@@ -554,6 +557,7 @@ impl Element for ChildView {
             "type": "ChildView",
             "view_id": self.view.id(),
             "bounds": bounds.to_json(),
+            "view": self.view.debug_json(cx.app),
             "child": if let Some(view) = cx.rendered_views.get(&self.view.id()) {
                 view.debug(cx)
             } else {