Draft for well_known tasks

home-manager/packages/rust-scripts/src/well_known.rs

@@ -0,0 +1,8 @@
+
+pub Trait {
+    fn definition() -> Task
+    fn is_task(&Task) -> bool
+    fn action_necessary(&TaskCache, State) -> Result<bool>
+    fn process(&mut TaskCache) -> Result<()>
+    fn refresh() -> refresh::Timer
+}