Add neovim config using nixvim

programs/nixvim/_plugins/conform.nix

@@ -0,0 +1,36 @@
+{ ... }:
+
+{
+  programs.nixvim = {
+    plugins.conform-nvim = {
+      enable = true;
+      settings = {
+        formatters_by_ft = {
+          lua = [ "stylua" ];
+          nix = [ "nixfmt" ];
+          python = ''
+            function(bufnr)
+              if require("conform").get_formatter_info("ruff_format", bufnr).available then
+                return { "ruff_fix", "ruff_format" }
+              else
+                return { "isort", "black", "flake8" }
+              end
+            end
+          '';
+          scala = [ "scalafmt" ];
+          swift = [ "swift_format" ];
+          "*" = [ "trim_whitespace" "trim_newlines" ];
+        };
+        format_on_save = ''
+          function(bufnr)
+            -- Disable with a global or buffer-local variable
+            if vim.g.disable_autoformat or vim.b[bufnr].disable_autoformat then
+              return
+            end
+            return { timeout_ms = 500, lsp_fallback = true }
+          end
+        '';
+      };
+    };
+  };
+}