feat(neovim): finish transition to nixvim

users/myuser/neovim/languages.nix

@@ -0,0 +1,47 @@
+{
+  programs.nixvim = {
+    files."ftplugin/nix.lua".extraConfigLua = ''
+      vim.opt_local.expandtab = true
+      vim.opt_local.tabstop = 2
+      vim.opt_local.shiftwidth = 2
+      vim.opt_local.softtabstop = 2
+    '';
+
+    plugins = {
+      treesitter = {
+        enable = true;
+        # TODO (autocmd * zR needed) folding = true;
+        indent = true;
+
+        incrementalSelection = {
+          enable = true;
+          keymaps = {
+            initSelection = "<C-Space>";
+            nodeIncremental = "<C-Space>";
+            scopeIncremental = "<C-S-Space>";
+            nodeDecremental = "<C-B>";
+          };
+        };
+
+        nixvimInjections = true;
+      };
+
+      # Show the current function / context in topmost line
+      treesitter-context.enable = true;
+
+      # Cargo.toml dependency completion
+      crates-nvim = {
+        enable = true;
+        extraOptions = {
+          src.cmp.enabled = true;
+        };
+      };
+
+      # Rust specific LSP tools
+      rust-tools = {
+        enable = true;
+        server.check.command = "clippy";
+      };
+    };
+  };
+}