feat(nvim): set tabs to 4 spaces for c/cpp

common/home/neovim/langs/clang.nix

@@ -19,6 +19,11 @@ in
         extraLuaConfig =
           # lua
           ''
+            vim.api.nvim_create_autocmd('FileType', {
+                pattern = { 'cpp' , 'c'},
+                command = 'setlocal ts=4 sw=4 sts=0 expandtab',
+            });
+
             local lsp = require('lspconfig');
             local coq = require('coq');