re-organize nixvim

programs/nixvim/plugins/lualine.nix

@@ -0,0 +1,49 @@
+{ ... }:
+
+{
+  programs.nixvim.plugins.lualine = {
+    enable = true;
+
+    settings = {
+      options.globalstatus = true;
+
+      sections = {
+        lualine_a = [ "mode" ];
+        lualine_b = [ "branch" ];
+        lualine_c = [
+          "filename"
+          "diff"
+        ];
+
+        lualine_x = [
+          "diagnostics"
+
+          {
+            __unkeyed.__raw = ''
+              function()
+                  local msg = ""
+                  local buf_ft = vim.api.nvim_buf_get_option(0, 'filetype')
+                  local clients = vim.lsp.get_clients()
+                  if next(clients) == nil then
+                      return msg
+                  end
+                  for _, client in ipairs(clients) do
+                      local filetypes = client.config.filetypes
+                      if filetypes and vim.fn.index(filetypes, buf_ft) ~= -1 then
+                          return client.name
+                      end
+                  end
+                  return msg
+              end
+            '';
+            icon = "";
+            color.fg = "#ffffff";
+          }
+          "encoding"
+          "fileformat"
+          "filetype"
+        ];
+      };
+    };
+  };
+}