@kugel- How well would it work, when: 1. The `parsers` directory is VERY different from upstream and the diff would be giant. 2. We only use the `main` and `parsers` directory from https://github.com/universal-ctags/ctags - we don't use anything else. Now of course we could add all the rest as well, including the tons of unit tests, docs, etc. but I'm not sure it's a good idea.
Now I have no experience with git subtrees so maybe this is solvable somehow. I'm just afraid we'd get huge amount of stuff we don't care about and having to deal with all the diffs and merge conflicts inside `parsers` whenever something changes upstream would make our life much harder.