nvim: Add support for clangd for C++ and ccls for C

clangd doesn't work the way I want it to with C.
ccls doesn't work the way I want it to with C++.

So now I use both for each ones they work well with.

dotfiles/nvim/lua/plugins/lsp/c.lua

@@ -1,5 +1,8 @@
 return function ()
-  require"lspconfig".clangd.setup {
-    capabilities = require"cmp_nvim_lsp".default_capabilities()
+  require"lspconfig".ccls.setup {
+    capabilities = require"cmp_nvim_lsp".default_capabilities(),
+    filetypes = {
+      "c"
+    }
   }
 end

dotfiles/nvim/lua/plugins/lsp/cxx.lua

@@ -0,0 +1,8 @@
+return function ()
+  require"lspconfig".clangd.setup {
+    capabilities = require"cmp_nvim_lsp".default_capabilities(),
+    filetypes = {
+      "cpp", "objc", "objcpp", "cuda", "proto"
+    }
+  }
+end

dotfiles/nvim/lua/settings/autocmds.lua

@@ -0,0 +1,37 @@
+vim.api.nvim_create_autocmd("BufReadPost", {
+  pattern = "*.h",
+  callback = function()
+    -- Toggle .h files between being interpreted as C and C++
+    -- in case I have to work on a C++ header that was saved
+    -- (incorrectly) as a C header file.
+    vim.api.nvim_create_user_command("Fytwmmrt", function()
+      if not vim.b.fu then
+        vim.b.fu = true
+        vim.bo.filetype = "cpp"
+        vim.cmd([[
+          LspStop ccls 
+          LspStart clangd 
+        ]])
+      else
+        vim.b.fu = false
+        vim.bo.filetype = "c"
+        vim.cmd([[
+          LspStop ccls 
+          LspStart clangd 
+        ]])
+      end
+    end, { desc = "Fuck you to whoever made me run this."})
+
+    -- Set all .h files to be interpreted as C by default instead
+    -- of C++. If you use .h for your C++ headers instead of .hpp
+    -- you should be ashamed of yourself and change and grow as a
+    -- person as to not repeat such heretical offenses.
+    if not vim.b.fu then
+      vim.bo.filetype = "c"
+      vim.cmd([[
+        LspStop clangd
+        LspStart ccls
+      ]])
+    end
+  end,
+})

modules/packages/nvim.nix

@@ -21,6 +21,7 @@
         (llvmPackages_19.clang-tools.override {
           enableLibcxx = true;
         })
+        ccls
         ripgrep
         nil
         gcc14