corrections and improvements to have all neovim lsp and completions working

programs/nixvim/autocommands.nix

@@ -0,0 +1,34 @@
+{ ... }:
+
+{
+  programs.nixvim.autoCmd = [
+    # Vertically center document when entering insert mode
+    {
+      event = "InsertEnter";
+      command = "norm zz";
+    }
+
+    # Open help in a vertical split
+    {
+      event = "FileType";
+      pattern = "help";
+      command = "wincmd L";
+    }
+
+    # Enable spellcheck for some filetypes
+    {
+      event = "FileType";
+      pattern = [
+        "markdown"
+      ];
+      command = "setlocal spell spelllang=en";
+    }
+
+    # Set indentation for specific filetypes
+    {
+      event = "FileType";
+      pattern = ["swift" "json" "lua" "nix"];
+      command = "setlocal shiftwidth=2 tabstop=2 softtabstop=2 expandtab";
+    }
+  ];
+}