Replace old C integration with lsp-mode config

config.org

@@ -299,52 +299,40 @@
      (setq-default indent-tabs-mode nil)
    #+end_src
 
+*** Language Server Protocol
+    LSP seems to be the way forward in terms of IDE-like features in
+    Emacs; grab =lsp-mode= and enable =lsp-deferred=:
+
+    #+begin_src emacs-lisp
+      (use-package lsp-mode
+        :init (setq lsp-keymap-prefix "C-c l")
+        :commands (lsp lsp-deferred))
+    #+end_src
+
+    =lsp-deferred= means that the LSP server will only be started once
+    a buffer is actually opened, which makes more sense to me.
+
+    Also going to give =lsp-ui= a shot, which displays a bunch of
+    information from the language server in the buffer. It looks like
+    it could be a bit much but we'll see.
+
+    #+begin_src emacs-lisp
+      (use-package lsp-ui :commands lsp-ui-mode)
+    #+end_src
+
+    Finally, to enable Ido integration:
+
+    #+begin_src emacs-lisp
+      (require 'lsp-ido)
+    #+end_src
+
 ** C
-   For C, I like to indent with tabs and align with spaces: this
+   For C there is =clangd= implementing LSP. Assuming that's installed
-   behaviour is provided by =smart-tabs-mode=.
+   and on the =PATH=, we can just hook =lsp-mode= into the default
+   mode and there will be much rejoicing.
 
    #+begin_src emacs-lisp
-     (use-package smart-tabs-mode)
+     (add-hook 'c-mode-hook #'lsp-deferred)
-     (smart-tabs-insinuate 'c)
-   #+end_src
-
-   I'll generally format my code in BSD style but I also use
-   =clang-format= a lot, so I have a keybinding to run that.
-
-   #+begin_src emacs-lisp
-     (setq c-default-style "bsd")
-     (setq c-basic-offset 4)
-
-     (use-package clang-format)
-     (add-hook 'c-mode-hook
-               (lambda ()
-                 (define-key c-mode-map (kbd "C-M-f")
-                   'clang-format-buffer)))
-   #+end_src
-
-   Meson is my build system of choice for C, but I also use CMake a lot.
-
-   #+begin_src emacs-lisp
-     (use-package meson-mode)
-     (use-package cmake-mode)
-   #+end_src
-
-*** Code Navigation
-    Using GNU Global for now, so hook =ggtags-mode= into =c-mode=:
-
-    #+begin_src emacs-lisp
-      (use-package ggtags
-        :config
-        (add-hook 'c-mode-common-hook
-                  (lambda () (ggtags-mode 1))))
-    #+end_src
-
-    And, of course, add some keybindings
-
-    #+begin_src emacs-lisp
-      (define-key ggtags-mode-map (kbd "C-c g r") 'ggtags-find-reference)
-      (define-key ggtags-mode-map (kbd "C-c g d") 'ggtags-find-definition)
-      (define-key ggtags-mode-map (kbd "C-c g u") 'ggtags-update-tags)
    #+end_src
 
 ** Haskell