spinners and gems

kiln-core/src/object_def.rs

@@ -49,6 +49,11 @@ pub struct ObjectDef {
     /// Whether the object can be shoved by a mover. Unused for now (no push
     /// mechanic yet); defaults to `false`.
     pub pushable: bool,
+    /// Whether walking into this object **grabs** it: the player moves onto the
+    /// cell and the object's `grab()` hook fires (the object is expected to
+    /// remove itself via `die()`). Set when a grab archetype (e.g. a gem) is
+    /// expanded into an object. Defaults to `false`.
+    pub grab: bool,
     /// Name of the Rhai script in [`Board::scripts`] that drives this object.
     /// `None` means this object has no script yet.
     pub script_name: Option<String>,
@@ -93,6 +98,7 @@ impl ObjectDef {
             solid: true,
             opaque: true,
             pushable: false,
+            grab: false,
             script_name: None,
             builtin_script: None,
             tags: HashSet::new(),