don't list subdirectories named 'internal'

instead of just specifically for lua files with a '-internal.lua' suffix

docs/changelog.txt

@@ -56,7 +56,7 @@ changelog.txt uses a syntax similar to RST, with a few special sequences:
 
 ## Lua
 - Added a ``ref_target`` field to primitive field references, corresponding to the ``ref-target`` XML attribute
-- Support for splitting scripts into multiple files without polluting the output of '#DFHack ls'. Scripts that end in '-internal.lua' will not be listed, but but they can still be 'require'd from other scripts.
+- Support for splitting scripts into multiple files without polluting the output of ``#DFHack ls``. Scripts can now add internal files to an ``scripts/internal`` folder.
 
 ## Ruby
 - Updated ``item_find`` and ``building_find`` to use centralized logic that works on more screens

library/Core.cpp

@@ -301,7 +301,7 @@ static void listScripts(PluginManager *plug_mgr, std::map<string,string> &pset,
     path += '/';
     for (size_t i = 0; i < files.size(); i++)
     {
-        if (hasEnding(files[i], ".lua") && !hasEnding(files[i], "-internal.lua"))
+        if (hasEnding(files[i], ".lua"))
         {
             string help = getScriptHelp(path + files[i], "--");
             string key = prefix + files[i].substr(0, files[i].size()-4);
@@ -317,7 +317,7 @@ static void listScripts(PluginManager *plug_mgr, std::map<string,string> &pset,
                 pset[key] = help;
             }
         }
-        else if (all && !files[i].empty() && files[i][0] != '.')
+        else if (all && !files[i].empty() && files[i][0] != '.' && files[i] != "internal")
         {
             listScripts(plug_mgr, pset, path+files[i]+"/", all, prefix+files[i]+"/");
         }