diff --git a/plugin/virtcolumn.lua b/plugin/virtcolumn.lua
index c050a18..3a5693a 100644
--- a/plugin/virtcolumn.lua
+++ b/plugin/virtcolumn.lua
@@ -3,158 +3,148 @@
 --- vim.g.virtcolumn_priority = 10
 
 local api, fn = vim.api, vim.fn
-local ffi = require "ffi"
+local ffi = require('ffi')
 
-ffi.cdef "int curwin_col_off(void);"
+ffi.cdef('int curwin_col_off(void);')
 ---@diagnostic disable-next-line: undefined-field
 local curwin_col_off = ffi.C.curwin_col_off
 
-local NS = api.nvim_create_namespace "virtcolumn"
+local NS = api.nvim_create_namespace('virtcolumn')
 
 ---@param cc string
 ---@return number[]
 local function parse_items(cc)
-    local textwidth = vim.o.textwidth
-    ---@type number[]
-    local items = {}
-    for _, c in ipairs(vim.split(cc, ",")) do
-        local item
-        if c and c ~= "" then
-            if vim.startswith(c, "+") then
-                if textwidth ~= 0 then
-                    item = textwidth + tonumber(c:sub(2))
-                end
-            elseif vim.startswith(cc, "-") then
-                if textwidth ~= 0 then
-                    item = textwidth - tonumber(c:sub(2))
-                end
-            else
-                item = tonumber(c)
-            end
-        end
-        if item and item > 0 then
-            table.insert(items, item)
-        end
+  local textwidth = vim.o.textwidth
+  ---@type number[]
+  local items = {}
+  for _, c in ipairs(vim.split(cc, ',')) do
+    local item
+    if c and c ~= '' then
+      if vim.startswith(c, '+') then
+        if textwidth ~= 0 then item = textwidth + tonumber(c:sub(2)) end
+      elseif vim.startswith(cc, '-') then
+        if textwidth ~= 0 then item = textwidth - tonumber(c:sub(2)) end
+      else
+        item = tonumber(c)
+      end
     end
-    table.sort(items, function(a, b)
-        return a > b
-    end)
-    return items
+    if item and item > 0 then table.insert(items, item) end
+  end
+  table.sort(items, function(a, b)
+    return a > b
+  end)
+  return items
 end
 
 local function _refresh()
-    local curbuf = api.nvim_get_current_buf()
-    if not api.nvim_buf_is_loaded(curbuf) then
-        return
-    end
-
-    local items = vim.b.virtcolumn_items or vim.w.virtcolumn_items
-    local local_cc = api.nvim_get_option_value("cc", { scope = "local" })
-    if not items or local_cc ~= "" then
-        items = parse_items(local_cc)
-        api.nvim_set_option_value("cc", "", { scope = "local" })
-    end
-    vim.b.virtcolumn_items = items
-    vim.w.virtcolumn_items = items
-
-    api.nvim_buf_clear_namespace(curbuf, NS, 0, -1)
-
-    local win_width = api.nvim_win_get_width(0) - curwin_col_off()
-    items = vim.tbl_filter(function(item)
-        return win_width > item
-    end, items)
-
-    if #items == 0 then
-        return
-    end
-
-    local debounce = math.floor(api.nvim_win_get_height(0) * 0.6)
-    local offset = vim.fn.line "w0"
-    -- Avoid flickering caused by winscrolled_timer
-    offset = (offset <= debounce and 1 or offset - debounce) - 1 -- convert to 0-based
-
-    --                                                Avoid flickering caused by winscrolled_timer
-    --                                                                    ↓↓↓↓↓↓↓↓↓↓↓
-    local lines = api.nvim_buf_get_lines(curbuf, offset, vim.fn.line "w$" + debounce, false)
-    local tabstop = vim.opt.tabstop:get()
-    local char = vim.g.virtcolumn_char or "▕"
-    local priority = vim.g.virtcolumn_priority or 10
-
-    for i = 1, #lines do
-        for _, item in ipairs(items) do
-            local line = lines[i]:gsub("\t", string.rep(" ", tabstop))
-            if api.nvim_strwidth(line) < item or fn.strpart(line, item - 1, 1) == " " then
-                api.nvim_buf_set_extmark(curbuf, NS, i + offset - 1, 0, {
-                    virt_text = { { char, "VirtColumn" } },
-                    hl_mode = "combine",
-                    virt_text_win_col = item - 1,
-                    priority = priority,
-                })
-            end
-        end
+  local curbuf = api.nvim_get_current_buf()
+  if not api.nvim_buf_is_loaded(curbuf) then return end
+
+  local items = vim.b.virtcolumn_items or vim.w.virtcolumn_items
+  local local_cc = api.nvim_get_option_value('cc', { scope = 'local' })
+  if not items or local_cc ~= '' then
+    items = parse_items(local_cc)
+    api.nvim_set_option_value('cc', '', { scope = 'local' })
+  end
+  vim.b.virtcolumn_items = items
+  vim.w.virtcolumn_items = items
+
+  api.nvim_buf_clear_namespace(curbuf, NS, 0, -1)
+
+  local win_width = api.nvim_win_get_width(0) - curwin_col_off()
+  items = vim.tbl_filter(function(item)
+    return win_width > item
+  end, items)
+
+  if #items == 0 then return end
+
+  local debounce = math.floor(api.nvim_win_get_height(0) * 0.6)
+  local offset = vim.fn.line('w0')
+  -- Avoid flickering caused by winscrolled_timer
+  offset = (offset <= debounce and 1 or offset - debounce) - 1 -- convert to 0-based
+
+  --                                                Avoid flickering caused by winscrolled_timer
+  --                                                                    ↓↓↓↓↓↓↓↓↓↓↓
+  local lines = api.nvim_buf_get_lines(curbuf, offset, vim.fn.line('w$') + debounce, false)
+  local tabstop = vim.opt.tabstop:get()
+  local char = vim.g.virtcolumn_char or '▕'
+  local priority = vim.g.virtcolumn_priority or 10
+
+  for i = 1, #lines do
+    for _, item in ipairs(items) do
+      local line = lines[i]:gsub('\t', string.rep(' ', tabstop))
+      if api.nvim_strwidth(line) < item or fn.strpart(line, item - 1, 1) == ' ' then
+        api.nvim_buf_set_extmark(curbuf, NS, i + offset - 1, 0, {
+          virt_text = { { char, 'VirtColumn' } },
+          hl_mode = 'combine',
+          virt_text_win_col = item - 1,
+          priority = priority,
+        })
+      end
     end
+  end
 end
 
 -- Avoid unnecessary refreshing as much as possible lcoallfdafffadf
 local winscrolled_timer
 local textchanged_timer
 local function refresh(args)
-    ---@type string
-    local event = args.event or ""
-    if event == "WinScrolled" then
-        if winscrolled_timer and winscrolled_timer:is_active() then
-            winscrolled_timer:stop()
-            winscrolled_timer:close()
-        end
-        winscrolled_timer = vim.defer_fn(_refresh, 100)
-    elseif event:match "TextChanged" then
-        if textchanged_timer and textchanged_timer:is_active() then
-            textchanged_timer:stop()
-            textchanged_timer:close()
-        end
-        local lines_count = vim.fn.line "$"
-        local delay
-        if lines_count ~= vim.b.virtcolumn_lines_count then
-            vim.b.virtcolumn_lines_count = lines_count
-            delay = 15
-        else
-            delay = 150
-        end
-        textchanged_timer = vim.defer_fn(_refresh, delay)
-    else
-        _refresh()
+  ---@type string
+  local event = args.event or ''
+  if event == 'WinScrolled' then
+    if winscrolled_timer and winscrolled_timer:is_active() then
+      winscrolled_timer:stop()
+      winscrolled_timer:close()
     end
+    winscrolled_timer = vim.defer_fn(_refresh, 100)
+  elseif event:match('TextChanged') then
+    if textchanged_timer and textchanged_timer:is_active() then
+      textchanged_timer:stop()
+      textchanged_timer:close()
+    end
+    local lines_count = vim.fn.line('$')
+    local delay
+    if lines_count ~= vim.b.virtcolumn_lines_count then
+      vim.b.virtcolumn_lines_count = lines_count
+      delay = 15
+    else
+      delay = 150
+    end
+    textchanged_timer = vim.defer_fn(_refresh, delay)
+  else
+    _refresh()
+  end
 end
 
 local function set_hl()
-    local cc_bg = api.nvim_get_hl_by_name("ColorColumn", true).background
-    if cc_bg then
-        api.nvim_set_hl(0, "VirtColumn", { fg = cc_bg, default = true })
-    else
-        vim.cmd [[hi default link VirtColumn NonText]]
-    end
+  local cc_bg = api.nvim_get_hl_by_name('ColorColumn', true).background
+  if cc_bg then
+    api.nvim_set_hl(0, 'VirtColumn', { fg = cc_bg, default = true })
+  else
+    vim.cmd([[hi default link VirtColumn NonText]])
+  end
 end
 
-local group = api.nvim_create_augroup("virtcolumn", {})
+local group = api.nvim_create_augroup('virtcolumn', {})
 api.nvim_create_autocmd({
-    "WinScrolled",
-    "TextChanged",
-    "TextChangedI",
-    "BufWinEnter",
-    "InsertLeave",
-    "InsertEnter",
-    "FileChangedShellPost",
+  'WinScrolled',
+  'TextChanged',
+  'TextChangedI',
+  'BufWinEnter',
+  'InsertLeave',
+  'InsertEnter',
+  'FileChangedShellPost',
 }, { group = group, callback = refresh })
-api.nvim_create_autocmd("OptionSet", {
-    group = group,
-    callback = function()
-        vim.b.virtcolumn_items = nil
-        vim.w.virtcolumn_items = nil
-        _refresh()
-    end,
-    pattern = "colorcolumn",
+api.nvim_create_autocmd('OptionSet', {
+  group = group,
+  callback = function()
+    vim.b.virtcolumn_items = nil
+    vim.w.virtcolumn_items = nil
+    _refresh()
+  end,
+  pattern = 'colorcolumn',
 })
-api.nvim_create_autocmd("ColorScheme", { group = group, callback = set_hl })
+api.nvim_create_autocmd('ColorScheme', { group = group, callback = set_hl })
 
 pcall(set_hl)
 pcall(_refresh)