Initial public release of Warp.

Repo-Sync-Origin: warpdotdev/warp-internal@12af1d983b

app/src/search/binding_source.rs

@@ -0,0 +1,39 @@
+use std::sync::Arc;
+
+use warpui::{Entity, EntityId, WindowId};
+
+use crate::util::bindings::CommandBinding;
+
+/// Type alias for the filter function that determines which command bindings to show
+pub type BindingFilterFn = Option<Arc<dyn Fn(&CommandBinding) -> bool>>;
+
+/// A model for tracking the current source of bindings for the command palette
+///
+/// This is necessary due to a quirk in how the UI Framework handles event handlers / callbacks:
+///
+/// In order to work around Rusts restriction on having two mutable references to the same data,
+/// the framework _removes_ a view from the map of all views before calling a handler (it then
+/// immediately re-inserts it into the map afterwards). This means then when a handler is being
+/// executed in a given View, that View is _not_ in the global map. Since the Command Palette is
+/// launched from the Workspace, which is the root of all terminal views, if we attempt to load the
+/// key bindings from somewhere within that view (even by calling `command_palette.update()`), it
+/// will fail with the Workspace missing from the map.
+///
+/// Instead, we create a small Model to cache the binding source information (window and view id)
+/// and subscribe to any changes to that model from here. Then the model update handler is
+/// scheduled after the event handler callback completes. This means that the update handler is
+/// called on the CommandPalette directly, rather than the Workspace. This is safe because the
+/// CommandPalette won't ever be the parent of any View that launches itself, so the fact that it
+/// won't be in the view map won't affect our ability to load the key bindings for other views.
+pub enum BindingSource {
+    None,
+    View {
+        window_id: WindowId,
+        view_id: EntityId,
+        binding_filter_fn: BindingFilterFn,
+    },
+}
+
+impl Entity for BindingSource {
+    type Event = ();
+}