after/ftplugin/javascript.vim

@@ -1,8 +0,0 @@
-" Disable inserting comment leader after hitting o or O or <Enter>
-set formatoptions-=o
-set formatoptions-=r
-
-set tabstop=2       " number of visual spaces per TAB
-set softtabstop=2   " number of spaces in tab when editing
-set shiftwidth=2    " number of spaces to use for autoindent
-set expandtab       " expand tab to spaces so that tabs are spaces

lua/config/statusline.lua

@@ -21,22 +21,14 @@ local function ime_state()
 end
 
 local function trailing_space()
-  local line_num = nil
+  -- Get the positions of trailing whitespaces from plugin 'jdhao/whitespace.nvim'.
-
+  local trailing_space_pos = vim.b.trailing_whitespace_pos
-  for i=1, fn.line('$') do
-    local linetext = fn.getline(i)
-    -- To prevent invalid escape error, we wrap the regex string with `[[]]`.
-    local idx = fn.match(linetext, [[\v\s+$]])
-
-    if idx ~= -1 then
-      line_num = i
-      break
-    end
-  end
 
   local msg = ""
-  if line_num ~= nil then
+  if #trailing_space_pos > 0 then
-    msg = string.format("[%d]trailing", line_num)
+    -- Note that lua index is 1-based, not zero based!!!
+    local line = trailing_space_pos[1][1]
+    msg = string.format("[%d]trailing", line)
   end
 
   return msg