prevent memleaks on parse errors

src/lang.zig

@@ -523,6 +523,11 @@ pub const Lang = struct {
     ) !void {
         // Based on the command struct fields, we can parse the arguments.
         var cmd = try self.allocator.create(command_struct);
+
+        // we already add the command to the list to prevent memory leaks
+        // by commands that error out
+        try commands.append(&cmd.base);
+
         const is_lv2_command = switch (command_struct.base_tag) {
             .noop, .load, .quicksave, .runqs, .rotate => false,
             else => true,
@@ -598,13 +603,12 @@ pub const Lang = struct {
         cmd.base.tag = command_struct.base_tag;
         const command = cmd.base.cast(command_struct).?;
         std.debug.warn("cmd: {s}\n", .{command});
-
-        try commands.append(&cmd.base);
     }
 
     pub fn parse(self: *Lang, data: []const u8) !CommandList {
         var splitted_it = std.mem.split(data, ";");
         var cmds = CommandList.init(self.allocator);
+        errdefer cmds.deinit();
 
         while (splitted_it.next()) |stmt_orig| {
             self.line += 1;