Add empty directory highlight group

lua/lib/lib.lua

@@ -92,7 +92,7 @@ end
 
 function M.unroll_dir(node)
   node.open = not node.open
-  if node.children_initial then node.children_initial = false end
+  if node.has_children then node.has_children = false end
   if #node.entries > 0 then
     renderer.draw(M.Tree, true)
   else

lua/lib/populate.lua

@@ -25,7 +25,7 @@ local function dir_new(cwd, name)
     match_name = path_to_matching_str(name),
     match_path = path_to_matching_str(absolute_path),
     open = false,
-    children_initial = has_children,
+    has_children = has_children,
     entries = {}
   }
 end

lua/lib/renderer.lua

@@ -238,10 +238,13 @@ local function update_draw_data(tree, depth, markers)
     local git_hl = get_git_hl(node)
 
     if node.entries then
-      local icon = get_folder_icon(node.open, node.link_to ~= nil, #node.entries ~= 0 or node.children_initial)
+      local has_children = #node.entries ~= 0 or node.has_children
+      local icon = get_folder_icon(node.open, node.link_to ~= nil, has_children)
       local git_icon = get_git_icons(node, index, offset, #icon+1) or ""
       -- INFO: this is mandatory in order to keep gui attributes (bold/italics)
-      set_folder_hl(index, offset, #icon, #node.name+#git_icon, 'NvimTreeFolderName')
+      local folder_hl = "NvimTreeFolderName"
+      if not has_children then folder_hl = "NvimTreeEmptyFolderName" end
+      set_folder_hl(index, offset, #icon, #node.name+#git_icon, folder_hl)
       if git_hl then
         set_folder_hl(index, offset, #icon, #node.name+#git_icon, git_hl)
       end