If people want to apply this mechanism, it shall be not much of a hassle for writers of most (modern) programming languages, as they mostly have some `src/` dir

If people want to apply this mechanism, it shall be not much of a hassle for writers of most (modern) programming languages, as they mostly have some `src/` directory (maybe also some `tests/`) that contains all source codes for a quick `git add`. For Golang users, I dunno...