ast: implement cleanup callbacks

bshell.runtime/ast/ast.c

@@ -154,10 +154,8 @@ struct bshell_ast_node *bshell_ast_iterator_dequeue(
 		return NULL;
 	}
 
-	struct bshell_ast_node *node = fx_unbox(
-		struct bshell_ast_node,
-		cur,
-		n_it.e_entry);
+	struct bshell_ast_node *node
+		= fx_unbox(struct bshell_ast_node, cur, n_it.e_entry);
 	const struct bshell_ast_node_definition *def
 		= bshell_ast_node_definitions[node->n_type];
 
@@ -178,10 +176,8 @@ void bshell_ast_iterator_enqueue(
 
 	fx_queue_entry *cur = fx_queue_first(&it->it_queue);
 	if (cur) {
-		struct bshell_ast_node *cur_node = fx_unbox(
-			struct bshell_ast_node,
-			cur,
-			n_it.e_entry);
+		struct bshell_ast_node *cur_node
+			= fx_unbox(struct bshell_ast_node, cur, n_it.e_entry);
 		new_depth = cur_node->n_it.e_depth + 1;
 	}
 
@@ -222,11 +218,8 @@ enum bshell_status bshell_ast_node_iterate(
 			return BSHELL_ERR_INTERNAL_FAILURE;
 		}
 
-		struct bshell_ast_iterate_result result = callback(
-			node,
-			BSHELL_AST_ITERATION_PRE,
-			it,
-			arg);
+		struct bshell_ast_iterate_result result
+			= callback(node, BSHELL_AST_ITERATION_PRE, it, arg);
 		if (result.r_status != BSHELL_SUCCESS
 		    || result.r_flags & BSHELL_AST_ITERATE_STOP) {
 			return result.r_status;
@@ -258,11 +251,8 @@ enum bshell_status bshell_ast_node_iterate(
 			return BSHELL_ERR_INTERNAL_FAILURE;
 		}
 
-		struct bshell_ast_iterate_result result = callback(
-			node,
-			BSHELL_AST_ITERATION_POST,
-			it,
-			arg);
+		struct bshell_ast_iterate_result result
+			= callback(node, BSHELL_AST_ITERATION_POST, it, arg);
 		if (result.r_status != BSHELL_SUCCESS
 		    || result.r_flags & BSHELL_AST_ITERATE_STOP) {
 			return result.r_status;