Merge root folder and parent navigator into one.

doc/nvim-tree-lua.txt

@@ -146,7 +146,7 @@ Can be `0` or `1`. When `1`, will hide dotfiles, files or folders which start
 with the `.` character.
 Default is 0
 
-|g:lua_tree_root_folder_modifier|			*g:lua_tree_hide_dotfiles*
+|g:lua_tree_root_folder_modifier|		*g:lua_tree_root_folder_modifier*
 
 In what format to show root folder. See `:help filename-modifiers` for
 available options.

lua/lib/lib.lua

@@ -58,7 +58,7 @@ function M.init(with_open, with_render)
 end
 
 local function get_node_at_line(line)
-  local index = 3
+  local index = 2
   local function iter(entries)
     for _, node in ipairs(entries) do
       if index == line then
@@ -135,9 +135,9 @@ end
 function M.set_index_and_redraw(fname)
   local i
   if M.Tree.cwd == '/' then
-    i = 1
+    i = 0
   else
-    i = 2
+    i = 1
   end
   local reload = false
 

lua/lib/renderer.lua

@@ -164,16 +164,10 @@ local root_folder_modifier = vim.g.lua_tree_root_folder_modifier or ':~'
 
 local function update_draw_data(tree, depth, markers)
   if tree.cwd and tree.cwd ~= '/' then
-    table.insert(lines, ".. (up a dir)")
-    table.insert(hl, {'LuaTreeFolderName', index, 0, 13})
-    index = 1
-  end
-
-  if tree.cwd then
-    local root_name = vim.fn.fnamemodify(tree.cwd, root_folder_modifier)
+    local root_name = vim.fn.fnamemodify(tree.cwd, root_folder_modifier):gsub('/$', '').."/.."
     table.insert(lines, root_name)
     table.insert(hl, {'LuaTreeRootFolder', index, 0, string.len(root_name)})
-    index = tree.cwd ~= '/' and 2 or 1
+    index = 1
   end
 
   for idx, node in ipairs(tree.entries) do