move add_packages to macro

src/backend/macros.rs

@@ -33,5 +33,11 @@ macro_rules! impl_backend_constants {
                     self.packages.insert(package.clone());
                 })
         }
+
+        fn add_packages(&mut self, packages: HashSet<Package>) {
+            for p in packages {
+                self.packages.insert(p);
+            }
+        }
     };
 }

src/backend/pacman.rs

@@ -25,12 +25,6 @@ impl Backend for Pacman {
     fn get_explicitly_installed_packages(&self) -> HashSet<Package> {
         convert_to_pacdef_packages(get_explicitly_installed_packages_from_alpm())
     }
-
-    fn add_packages(&mut self, packages: HashSet<Package>) {
-        for p in packages {
-            self.packages.insert(p);
-        }
-    }
 }
 
 fn get_all_installed_packages_from_alpm() -> HashSet<String> {

src/backend/rust.rs

@@ -24,12 +24,6 @@ impl Backend for Rust {
     fn get_explicitly_installed_packages(&self) -> HashSet<Package> {
         self.get_all_installed_packages()
     }
-
-    fn add_packages(&mut self, packages: HashSet<Package>) {
-        for p in packages {
-            self.packages.insert(p);
-        }
-    }
 }
 
 fn run_cargo_install_list() -> String {