function to show spell indicator

lua/emp/plugins/lualine.lua

@@ -49,6 +49,14 @@ return {
       },
     }
 
+    -- spell indicator
+    local function spell()
+      if vim.wo.spell == true then
+        return "[" .. vim.bo.spelllang .. "]"
+      end
+      return ""
+    end
+
     -- configure lualine with modified theme
     lualine.setup({
       options = {
@@ -61,6 +69,7 @@ return {
             cond = lazy_status.has_updates,
             color = { fg = "#ff9e64" },
           },
+          { spell },
           { "encoding" },
           { "fileformat" },
           { "filetype" },