Snapshot: V4 plugin API and host integration

src/app/update/command.rs

@@ -12,6 +12,8 @@ use crate::modules::ModuleEvent;
 use crate::scene::pick::grip::{
     find_hit_grip, find_hit_grip_paper, find_hit_grip_rte, GripEdit, GripEditMode,
 };
+#[cfg(not(target_arch = "wasm32"))]
+use crate::plugin::v4_support;
 use crate::scene::model::object::GripApply;
 use crate::scene::{
     self, hover_id, CubeRegion, Scene, VIEWCUBE_DRAW_PX, VIEWCUBE_PAD, VIEWCUBE_PX,
@@ -109,6 +111,7 @@ pub(super) fn on_tab_close(&mut self, idx: usize) -> Task<Message> {
                     self.pending_close = Some(crate::app::PendingClose::Tab(idx));
                     return self.open_unsaved_dialog_window();
                 }
+                let tab_id = self.tabs.get(idx).map(|t| t.id);
                 // This tab is closing for good — drop its autosave recovery copy.
                 #[cfg(not(target_arch = "wasm32"))]
                 let _ = std::fs::remove_file(self.autosave_target(idx));
@@ -132,6 +135,10 @@ pub(super) fn on_tab_close(&mut self, idx: usize) -> Task<Message> {
                 self.sync_ribbon_layers();
                 self.sync_ribbon_styles();
                 self.sync_ribbon_from_selection();
+                if let Some(tab_id) = tab_id {
+                    #[cfg(not(target_arch = "wasm32"))]
+                    v4_support::on_tab_closed(tab_id);
+                }
                 Task::none()
     }
 

src/app/update/mod.rs

@@ -302,6 +302,21 @@ impl OpenCADStudio {
 
     fn update_inner(&mut self, msg: Message) -> Task<Message> {
         match msg {
+            // Drain plugin-to-host requests that arrived outside of a host call.
+            // This runs on a periodic timer so long-lived plugin sessions such
+            // as the Python REPL can mutate the document without requiring a
+            // user-generated message. Desktop only.
+            #[cfg(not(target_arch = "wasm32"))]
+            Message::DrainPluginRequests => {
+                if self.active_tab < self.tabs.len() {
+                    let mut host = crate::app::plugin_host::HostSession::new(self, self.active_tab);
+                    crate::plugin::external::with_manager(|mgr| {
+                        mgr.drain_requests(&mut host, &mut |_| {});
+                    });
+                }
+                Task::none()
+            }
+
             // Web: fetch every script queued by startup language selection or
             // drawing text discovery. Each script has one shared store entry.
             Message::PollWebFonts => {