add clippy::map_entry

crates/pacdef_core/src/backend/backend_trait.rs

@@ -122,13 +122,7 @@ fn get_group_packages_map(
     let mut group_package_map = HashMap::new();
 
     for (p, group) in to_assign {
-        if !group_package_map.contains_key(&group) {
-            group_package_map.insert(group.clone(), vec![]);
-        }
-
-        let inner = group_package_map
-            .get_mut(&group)
-            .expect("either it was already there or we created it");
+        let inner = group_package_map.entry(group).or_insert(vec![]);
         inner.push(p);
     }
 

crates/pacdef_core/src/lib.rs

@@ -7,6 +7,7 @@ This library contains all logic that happens in `pacdef` under the hood.
     clippy::cognitive_complexity,
     clippy::explicit_iter_loop,
     clippy::explicit_into_iter_loop,
+    clippy::map_entry,
     clippy::missing_errors_doc,
     clippy::missing_panics_doc,
     clippy::option_if_let_else,