Make empty dir icons auto update

lua/lib/fs.lua

@@ -54,6 +54,7 @@ function M.create(node)
   if not ans or #ans == 0 then return end
 
   if not ans:match('/') then
+    node.open = true
     return create_file(add_into..ans)
   end
 

lua/lib/populate.lua

@@ -16,7 +16,7 @@ local function dir_new(cwd, name)
   local absolute_path = cwd..'/'..name
   local stat = luv.fs_stat(absolute_path)
   local handle = luv.fs_opendir(absolute_path, nil, 1)
-  local children = luv.fs_readdir(handle)
+  local child = luv.fs_readdir(handle)
   luv.fs_closedir(handle)
   return {
     name = name,
@@ -26,7 +26,7 @@ local function dir_new(cwd, name)
     match_name = path_to_matching_str(name),
     match_path = path_to_matching_str(absolute_path),
     open = false,
-    empty = children == nil,
+    has_children = child ~= nil,
     entries = {}
   }
 end

lua/lib/renderer.lua

@@ -16,21 +16,21 @@ local set_folder_hl = function(line, depth, git_icon_len, _, hl_group)
 end
 
 if icon_state.show_folder_icon then
-  get_folder_icon = function(open, is_symlink, is_empty)
+  get_folder_icon = function(open, is_symlink, has_children)
     local n = ""
     if is_symlink then
       n = icon_state.icons.folder_icons.symlink
     elseif open then
-      if is_empty then
-        n = icon_state.icons.folder_icons.empty_open
-      else
+      if has_children then
         n = icon_state.icons.folder_icons.open
+      else
+        n = icon_state.icons.folder_icons.empty_open
       end
     else
-      if is_empty then
-        n = icon_state.icons.folder_icons.empty
-      else
+      if has_children then
         n = icon_state.icons.folder_icons.default
+      else
+        n = icon_state.icons.folder_icons.empty
       end
     end
     return n.." "
@@ -238,7 +238,8 @@ 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.empty)
+      local icon = get_folder_icon(node.open, node.link_to ~= nil, #node.entries ~= 0 or node.has_children)
+      if node.has_children then node.has_children = nil end
       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')