Began program manager, made terminal modals per-window

crates/workspace/src/programs.rs

@@ -0,0 +1,77 @@
+// TODO: Need to put this basic structure in workspace, and make 'program handles'
+// based off of the 'searchable item' pattern except with models. This way, the workspace's clients
+// can register their models as programs with a specific identity and capable of notifying the workspace
+// Programs are:
+//  - Kept alive by the program manager, they need to emit an event to get dropped from it
+//  - Can be interacted with directly, (closed, activated, etc.) by the program manager, bypassing
+//    associated view(s)
+//  - Have special rendering methods that the program manager requires them to implement to fill out
+//    the status bar
+//  - Can emit events for the program manager which:
+//    - Add a jewel (notification, change, etc.)
+//    - Drop the program
+//    - ???
+//  - Program Manager is kept in a global, listens for window drop so it can drop all it's program handles
+
+use collections::HashMap;
+use gpui::{AnyModelHandle, Entity, ModelHandle, View, ViewContext};
+
+/// This struct is going to be the starting point for the 'program manager' feature that will
+/// eventually be implemented to provide a collaborative way of engaging with identity-having
+/// features like the terminal.
+pub struct ProgramManager {
+    // TODO: Make this a hashset or something
+    modals: HashMap<usize, AnyModelHandle>,
+}
+
+impl ProgramManager {
+    pub fn insert_or_replace<T: Entity, V: View>(
+        window: usize,
+        program: ModelHandle<T>,
+        cx: &mut ViewContext<V>,
+    ) -> Option<AnyModelHandle> {
+        cx.update_global::<ProgramManager, _, _>(|pm, _| {
+            pm.insert_or_replace_internal::<T>(window, program)
+        })
+    }
+
+    pub fn remove<T: Entity, V: View>(
+        window: usize,
+        cx: &mut ViewContext<V>,
+    ) -> Option<ModelHandle<T>> {
+        cx.update_global::<ProgramManager, _, _>(|pm, _| pm.remove_internal::<T>(window))
+    }
+
+    pub fn new() -> Self {
+        Self {
+            modals: Default::default(),
+        }
+    }
+
+    /// Inserts or replaces the model at the given location.
+    fn insert_or_replace_internal<T: Entity>(
+        &mut self,
+        window: usize,
+        program: ModelHandle<T>,
+    ) -> Option<AnyModelHandle> {
+        self.modals.insert(window, AnyModelHandle::from(program))
+    }
+
+    /// Remove the program associated with this window, if it's of the given type
+    fn remove_internal<T: Entity>(&mut self, window: usize) -> Option<ModelHandle<T>> {
+        let program = self.modals.remove(&window);
+        if let Some(program) = program {
+            if program.is::<T>() {
+                // Guaranteed to be some, but leave it in the option
+                // anyway for the API
+                program.downcast()
+            } else {
+                // Model is of the incorrect type, put it back
+                self.modals.insert(window, program);
+                None
+            }
+        } else {
+            None
+        }
+    }
+}

crates/workspace/src/workspace.rs

@@ -5,6 +5,7 @@
 /// specific locations.
 pub mod pane;
 pub mod pane_group;
+pub mod programs;
 pub mod searchable;
 pub mod sidebar;
 mod status_bar;
@@ -36,6 +37,7 @@ use log::error;
 pub use pane::*;
 pub use pane_group::*;
 use postage::prelude::Stream;
+use programs::ProgramManager;
 use project::{fs, Fs, Project, ProjectEntryId, ProjectPath, ProjectStore, Worktree, WorktreeId};
 use searchable::SearchableItemHandle;
 use serde::Deserialize;
@@ -146,6 +148,8 @@ impl_actions!(workspace, [ToggleProjectOnline, ActivatePane]);
 pub fn init(app_state: Arc<AppState>, cx: &mut MutableAppContext) {
     pane::init(cx);
 
+    cx.set_global(ProgramManager::new());
+
     cx.add_global_action(open);
     cx.add_global_action({
         let app_state = Arc::downgrade(&app_state);