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Wait, what? Tagging system? What is it? 2015? Doesn't emacs have a good LSP support by now?

Nowadays with the popularity of treesitter and LSP even small-community command line text editors can have most of what IDEs do built-in.

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LSPs of today have a really large surface area to be implemented as LSPs grew a lot on what they can do. I don't think it's easy to wire down a LSP to any IDE, and lots of small IDEs are written around some text component - like Scintilla. If the text component doesn't have a standard way to be wired up to a LSP, that is already properly maintained, it's really hard to implement it.

emacs 29 comes with eglot built-in. That's the LSP client for emacs and as long as your language has an LSP server, it can hook to it. OP is using C and I am not sure there's a LSP server for C that can work well in emacs, but using Go and Dart and Java seems to work just fine in emacs, just like other IDEs.

Even relatively small, immature, niche CLI text editors start with LSP + tree-sitter support, so I'm not convinced that it would be too much for a mature OS like emacs.

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