handle null case, as well

locco.lua

@@ -118,8 +118,8 @@ function generate_html(source, path, filename, sections, jump_to)
   f:write(h)
   for i=1, #sections do
     local t = template.table_entry:gsub('%%index%%', i..'')
-    t = t:gsub('%%docs_html%%', sections[i]['docs_html']:gsub('%%', '%%%%'))
-    t = t:gsub('%%code_html%%', sections[i]['code_html']:gsub('%%', '%%%%'))
+    t = t:gsub('%%docs_html%%', replace_percent(sections[i]['docs_html']))
+    t = t:gsub('%%code_html%%', replace_percent(sections[i]['code_html']))
     f:write(t)
   end
   f:write(template.footer)
@@ -162,6 +162,11 @@ function escape(s)
   return s
 end
 
+function replace_percent(s)
+  s = s:gsub('%%', '%%%%')
+  return s
+end
+
 -- Define the Lua keywords, built-in functions and operators that should
 -- be highlighted.
 local keywords = { 'break', 'do', 'else', 'elseif', 'end', 'false', 'for',