diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..2af0068
--- /dev/null
+++ b/TODO.md
@@ -0,0 +1,3 @@
+- Defination vs Reference (A seperate def call)
+- Called by (which function calls this or reference the variable)
+- inline edit in float window (Almost done)
diff --git a/lua/navigator.lua b/lua/navigator.lua
index b62356f..e70fe10 100644
--- a/lua/navigator.lua
+++ b/lua/navigator.lua
@@ -9,13 +9,10 @@ _NgConfigValues = {
   --   -- your on_attach will be called at end of navigator on_attach
   -- end,
   sumneko_root_path = vim.fn.expand("$HOME") .. "/github/sumneko/lua-language-server",
-  sumneko_binary = vim.fn.expand("$HOME") .. "/github/sumneko/lua-language-server/bin/macOS/lua-language-server",
-  code_action_prompt = {
-    enable = true,
-    sign = true,
-    sign_priority = 40,
-    virtual_text = true
-  }
+  sumneko_binary = vim.fn.expand("$HOME") ..
+      "/github/sumneko/lua-language-server/bin/macOS/lua-language-server",
+  treesitter_call_tree = true,
+  code_action_prompt = {enable = true, sign = true, sign_priority = 40, virtual_text = true}
 }
 
 vim.cmd("command! -nargs=0 LspLog call v:lua.open_lsp_log()")
@@ -23,27 +20,21 @@ vim.cmd("command! -nargs=0 LspRestart call v:lua.reload_lsp()")
 
 local extend_config = function(opts)
   opts = opts or {}
-  if next(opts) == nil then
-    return
-  end
+  if next(opts) == nil then return end
   for key, value in pairs(opts) do
     if _NgConfigValues[key] == nil then
       error(string.format("[] Key %s not valid", key))
       return
     end
     if type(M.config_values[key]) == "table" then
-      for k, v in pairs(value) do
-        _NgConfigValues[key][k] = v
-      end
+      for k, v in pairs(value) do _NgConfigValues[key][k] = v end
     else
       _NgConfigValues[key] = value
     end
   end
 end
 
-M.config_values = function()
-  return _NgConfigValues
-end
+M.config_values = function() return _NgConfigValues end
 
 M.setup = function(cfg)
   extend_config(cfg)
diff --git a/lua/navigator/definition.lua b/lua/navigator/definition.lua
index 88b3dad..90de38d 100644
--- a/lua/navigator/definition.lua
+++ b/lua/navigator/definition.lua
@@ -5,8 +5,16 @@ local gui = require "navigator.gui"
 local log = util.log
 local TextView = require("guihua.textview")
 -- callback for lsp definition, implementation and declaration handler
-local function definition_hdlr(_, _, locations, _, bufnr)
+local function definition_hdlr(err, _, locations, _, bufnr)
   -- log(locations)
+  if err ~= nil then
+    print(err)
+    return
+  end
+  if type(locations) == "number" then
+    log(locations)
+    err("unable to handle request")
+  end
   if locations == nil or vim.tbl_isempty(locations) then
     print "Definition not found"
     return
@@ -38,9 +46,7 @@ local function def_preview(timeout_ms)
   -- result = {vim.tbl_deep_extend("force", {}, unpack(result))}
   -- log("def-preview", result)
   for key, value in pairs(result) do
-    if result[key] ~= nil then
-      table.insert(data, value.result[1])
-    end
+    if result[key] ~= nil then table.insert(data, value.result[1]) end
   end
   local range = data[1].targetRange or data[1].range
 
@@ -49,13 +55,9 @@ local function def_preview(timeout_ms)
   row = math.max(row - 3, 1)
   local delta = range.start.line - row + 1
   local uri = data[1].uri or data[1].targetUri
-  if not uri then
-    return
-  end
+  if not uri then return end
   local bufnr = vim.uri_to_bufnr(uri)
-  if not vim.api.nvim_buf_is_loaded(bufnr) then
-    vim.fn.bufload(bufnr)
-  end
+  if not vim.api.nvim_buf_is_loaded(bufnr) then vim.fn.bufload(bufnr) end
   -- TODO: 12 should be an option
   local definition = vim.api.nvim_buf_get_lines(bufnr, row, range["end"].line + 12, false)
   local def_line = vim.api.nvim_buf_get_lines(bufnr, range.start.line, range.start.line + 1, false)
diff --git a/lua/navigator/gui.lua b/lua/navigator/gui.lua
index 417afa0..b4e2fcf 100644
--- a/lua/navigator/gui.lua
+++ b/lua/navigator/gui.lua
@@ -2,72 +2,78 @@ local M = {}
 local ListView = require "guihua.listview"
 local TextView = require "guihua.textview"
 local util = require "navigator.util"
-local log = require "navigator.util".log
-local verbose = require "navigator.util".verbose
+local log = require"navigator.util".log
+local verbose = require"navigator.util".verbose
 local api = vim.api
 
 function M.new_preview(opts)
-  return TextView:new(
-    {
-      loc = "top_center",
-      rect = {
-        height = opts.preview_heigh or 12,
-        width = opts.width or 100,
-        pos_x = opts.pos_x or 0,
-        pos_y = opts.pos_y or 4
-      },
-      -- data = display_data,
-      relative = opts.relative,
-      data = opts.items,
-      syntax = opts.syntax,
-      enter = opts.enter or false,
-      hl_line = opts.hl_line
-    }
-  )
+  return TextView:new({
+    loc = "top_center",
+    rect = {
+      height = opts.height, -- opts.preview_heigh or 12, -- TODO 12
+      width = opts.width or 100,
+      pos_x = opts.pos_x or 0,
+      pos_y = opts.pos_y or 4
+    },
+    -- data = display_data,
+    relative = opts.relative,
+    -- data = opts.items, -- either items or uri
+    uri = opts.uri,
+    syntax = opts.syntax,
+    enter = opts.enter or false,
+    range = opts.range,
+    display_range = opts.display_range,
+    hl_line = opts.hl_line
+  })
 end
 
-function M._preview_location(opts) --location, width, pos_x, pos_y
-  local uri = opts.location.targetUri or opts.location.uri
+function M._preview_location(opts) -- location, width, pos_x, pos_y
+  local uri = opts.location.uri
   if opts.uri == nil then
     log("invalid/nil uri ")
     return
   end
   local bufnr = vim.uri_to_bufnr(uri)
-  if not api.nvim_buf_is_loaded(bufnr) then
-    vim.fn.bufload(bufnr)
-  end
+  if not api.nvim_buf_is_loaded(bufnr) then vim.fn.bufload(bufnr) end
   --
 
-  local range = opts.location.targetRange or opts.location.range
-  if range.start == nil then
-    print("error invalid range")
-    return
-  end
-  if range.start.line == nil then
-    range.start.line = range["end"].line - 1
-    opts.lnum = range["end"].line + 1
-    log(opts)
-  end
-  if range["end"].line == nil then
-    range["end"].line = range.start.line + 1
-    opts.lnum = range.start.line + 1
-    log(opts)
-  end
-  local contents = api.nvim_buf_get_lines(bufnr, range.start.line, (range["end"].line or 1) + 10, false)
+  local display_range = opts.location.range
+  -- if range.start == nil then
+  --   print("error invalid range")
+  --   return
+  -- end
+  -- if range.start.line == nil then
+  --   range.start.line = range["end"].line - 1
+  --   opts.lnum = range["end"].line + 1
+  --   log(opts)
+  -- end
+  -- if range["end"].line == nil then
+  --   range["end"].line = range.start.line + 1
+  --   opts.lnum = range.start.line + 1
+  --   log(opts)
+  -- end
+  -- TODO: preview height
+  -- local contents = api.nvim_buf_get_lines(bufnr, range.start.line, range["end"].line, false)
   --
-  local syntax = api.nvim_buf_get_option(bufnr, "syntax")
-  if syntax == nil or #syntax < 1 then
-    syntax = api.nvim_buf_get_option(bufnr, "ft")
-  end
+  local syntax = api.nvim_buf_get_option(bufnr, "ft")
+  if syntax == nil or #syntax < 1 then syntax = "c" end
 
-  verbose(syntax, contents)
-  local win_opts = {syntax = syntax, width = opts.width, pos_x = opts.offset_x or 0, pos_y = opts.offset_y or 10}
-  win_opts.items = contents
-  win_opts.hl_line = opts.lnum - range.start.line
-  if win_opts.hl_line < 0 then
-    win_opts.hl_line = 1
-  end
-  verbose(opts.lnum, range.start.line, win_opts.hl_line)
+  -- verbose(syntax, contents)
+  local win_opts = {
+    syntax = syntax,
+    width = opts.width,
+    height = display_range['end'].line - display_range.start.line + 1,
+    pos_x = opts.offset_x or 0,
+    pos_y = opts.offset_y or 10,
+    range = opts.range,
+    display_range = display_range,
+    uri = uri,
+    allow_edit = true
+  }
+  -- win_opts.items = contents
+  win_opts.hl_line = opts.lnum - display_range.start.line
+  if win_opts.hl_line < 0 then win_opts.hl_line = 1 end
+  verbose(opts.lnum, opts.range.start.line, win_opts.hl_line)
   local w = M.new_preview(win_opts)
 
   return w
@@ -75,15 +81,14 @@ end
 
 function M.preview_uri(opts) -- uri, width, line, col, offset_x, offset_y
   local line_beg = opts.lnum - 1
-  if line_beg >= 2 then
-    line_beg = line_beg - 2
-  end
-  local loc = {uri = opts.uri, targetRange = {start = {line = line_beg}}}
-  -- TODO: options for 8
-  loc.targetRange["end"] = {line = opts.lnum + 8}
+  if line_beg >= 2 then line_beg = line_beg - 2 end
+  local loc = {uri = opts.uri, range = {start = {line = line_beg}}}
+
+  -- TODO: preview height
+  loc.range["end"] = {line = opts.lnum + 12}
   opts.location = loc
 
-  -- log("uri", opts.uri, opts.lnum, opts.location)
+  log("uri", opts.uri, opts.lnum, opts.location)
   return M._preview_location(opts)
 end
 
@@ -92,69 +97,129 @@ function M.new_list_view(opts)
 
   local items = opts.items
   local data = {}
-  if opts.rawdata then
-    data = items
-  else
-    data = require "guihua.util".aggregate_filename(items, opts)
-  end
+
   local wwidth = api.nvim_get_option("columns")
   local width = math.min(opts.width or config.width or 120, math.floor(wwidth * 0.8))
   local wheight = config.height or math.floor(api.nvim_get_option("lines") * 0.8)
   local prompt = opts.prompt or false
+  opts.width = width
+  if opts.rawdata then
+    data = items
+  else
+    data = require"guihua.util".prepare_for_render(items, opts)
+  end
+
   if data and not vim.tbl_isempty(data) then
     -- replace
     -- TODO: 10 vimrc opt
-    if #data > 10 and opts.prompt == nil then
-      prompt = true
-    end
+    if #data > 10 and opts.prompt == nil then prompt = true end
 
     local height = math.min(#data, math.floor(wheight / 2))
-    local offset_y = height
-    if prompt then
-      offset_y = offset_y + 1
-    end
-    return ListView:new(
-      {
-        loc = "top_center",
-        prompt = prompt,
-        relative = opts.relative,
-        style = opts.style,
-        api = opts.api,
-        rect = {
-          height = height,
+    local offset_y = height + 2 -- style shadow took 2 lines
+    if prompt then offset_y = offset_y + 1 end
+    return ListView:new({
+      loc = "top_center",
+      prompt = prompt,
+      relative = opts.relative,
+      style = opts.style,
+      api = opts.api,
+      rect = {height = height, width = width, pos_x = 0, pos_y = 0},
+      ft = opts.ft or 'guihua',
+      -- data = display_data,
+      data = data,
+      on_confirm = opts.on_confirm or function(pos)
+        if pos == 0 then pos = 1 end
+        local l = data[pos]
+        if l.filename ~= nil then
+          verbose("openfile ", l.filename, l.lnum, l.col)
+          util.open_file_at(l.filename, l.lnum, l.col)
+        end
+      end,
+      on_move = opts.on_move or function(pos)
+        if pos == 0 then pos = 1 end
+        local l = data[pos]
+        verbose("on move", pos, l)
+        verbose("on move", pos, l.text or l, l.uri, l.filename)
+        -- todo fix
+        if l.uri == nil then l.uri = "file:///" .. l.filename end
+        return M.preview_uri({
+          uri = l.uri,
           width = width,
-          pos_x = 0,
-          pos_y = 0
-        },
-        -- data = display_data,
-        data = data,
-        on_confirm = opts.on_confirm or function(pos)
-            if pos == 0 then
-              pos = 1
-            end
-            local l = data[pos]
-            if l.filename ~= nil then
-              verbose("openfile ", l.filename, l.lnum, l.col)
-              util.open_file_at(l.filename, l.lnum, l.col)
-            end
-          end,
-        on_move = opts.on_move or function(pos)
-            if pos == 0 then
-              pos = 1
-            end
-            local l = data[pos]
-            verbose("on move", pos, l.text or l, l.uri, l.filename)
-            -- todo fix
-            if l.uri == nil then
-              l.uri = "file:///" .. l.filename
-            end
-            return M.preview_uri(
-              {uri = l.uri, width = width, lnum = l.lnum, col = l.col, offset_x = 0, offset_y = offset_y}
-            )
-          end
-      }
-    )
+          lnum = l.lnum,
+          col = l.col,
+          range = l.range,
+          offset_x = 0,
+          offset_y = offset_y,
+          border = "double"
+        })
+      end
+    })
   end
 end
 
 return M
+
+-- Doc
+
+--[[
+    -- each item should look like this
+    -- update if API changes
+    {
+      call_by = { <table 1> },
+      col = 40,
+      display_filename = "./curry.js",
+      filename = "/Users/ray.xu/lsp_test/js/curry.js",
+      lnum = 4,
+      range = {
+        end = {
+          character = 46,
+          line = 3  -- note: C index
+        },
+        start = {
+          character = 39,
+          line = 3
+        }
+      },
+      rpath = "js/curry.js",
+      text = "      (sum, element, index) => (sum += element * vector2[index]),",
+      uri = "file:///Users/ray.xu/lsp_test/js/curry.js"
+    }
+  --]]
+
+-- on move item:
+--[[
+
+ call_by = { {
+      kind = " ",
+      node_scope = {
+        end = {
+          character = 1,
+          line = 7
+        },
+        start = {
+          character = 0,
+          line = 0
+        }
+      },
+      node_text = "curriedDot",
+      type = "var"
+    } },
+  col = 22,
+  display_filename = "./curry.js",
+  filename = "/Users/ray.xu/lsp_test/js/curry.js",
+  lnum = 4,
+  range = {
+    end = {
+      character = 26,
+      line = 3
+    },
+    start = {
+      character = 21,
+      line = 3
+    }
+  },
+  rpath = "js/curry.js",
+  text = "    4:        (sum, element, index) => (sum += element * vector     curriedDot()",
+  uri = "file:///Users/ray.xu/lsp_test/js/curry.js"
+--
+]]
diff --git a/lua/navigator/hierarchy.lua b/lua/navigator/hierarchy.lua
index f359a91..2186b62 100644
--- a/lua/navigator/hierarchy.lua
+++ b/lua/navigator/hierarchy.lua
@@ -1,15 +1,17 @@
 local gui = require "navigator.gui"
 local util = require "navigator.util"
 local log = util.log
-local  partial = util.partial
+local partial = util.partial
 local lsphelper = require "navigator.lspwrapper"
 local cwd = vim.fn.getcwd(0)
 local M = {}
 
-local function call_hierarchy_handler(direction, err, _, result, _, _, error_message)
+local function call_hierarchy_handler(direction, err, _, result, _, _,
+                                      error_message)
   -- log('call_hierarchy')
 
-  assert(#vim.lsp.buf_get_clients() > 0, "Must have a client running to use lsp_tags")
+  assert(#vim.lsp.buf_get_clients() > 0,
+         "Must have a client running to use lsp_tags")
   if err ~= nil then
     print("ERROR: " .. error_message)
     return
@@ -21,24 +23,22 @@ local function call_hierarchy_handler(direction, err, _, result, _, _, error_mes
     local call_hierarchy_item = call_hierarchy_call[direction]
     local kind = ' '
     if call_hierarchy_item.kind then
-      kind = require'navigator.lspclient.lspkind'.symbol_kind(call_hierarchy_item.kind) .. ' '
+      kind = require'navigator.lspclient.lspkind'.symbol_kind(
+                 call_hierarchy_item.kind) .. ' '
     end
     for _, range in pairs(call_hierarchy_call.fromRanges) do
       local filename = assert(vim.uri_to_fname(call_hierarchy_item.uri))
       local display_filename = filename:gsub(cwd .. "/", "./", 1)
-      table.insert(
-        items,
-        {
-          uri = call_hierarchy_item.uri,
-          filename = filename,
-          -- display_filename = filename:gsub(cwd .. "/", "./", 1),
-          display_filename = call_hierarchy_item.detail or display_filename,
-          text = kind .. call_hierarchy_item.name,
-          range = range,
-          lnum = range.start.line,
-          col = range.start.character
-        }
-      )
+      table.insert(items, {
+        uri = call_hierarchy_item.uri,
+        filename = filename,
+        -- display_filename = filename:gsub(cwd .. "/", "./", 1),
+        display_filename = call_hierarchy_item.detail or display_filename,
+        text = kind .. call_hierarchy_item.name,
+        range = range,
+        lnum = range.start.line,
+        col = range.start.character
+      })
     end
   end
   return items
@@ -47,38 +47,45 @@ end
 local call_hierarchy_handler_from = partial(call_hierarchy_handler, "from")
 local call_hierarchy_handler_to = partial(call_hierarchy_handler, "to")
 
-local function incoming_calls_handler(bang, err, method, result, client_id, bufnr)
-  assert(#vim.lsp.buf_get_clients() > 0, "Must have a client running to use lsp_tags")
-  local results = call_hierarchy_handler_from(err, method, result, client_id, bufnr, "Incoming calls not found")
-  gui.new_list_view({items = results, api = ' '})
+local function incoming_calls_handler(bang, err, method, result, client_id,
+                                      bufnr)
+  assert(#vim.lsp.buf_get_clients() > 0,
+         "Must have a client running to use lsp_tags")
+  local results = call_hierarchy_handler_from(err, method, result, client_id,
+                                              bufnr, "Incoming calls not found")
+
+  local ft = vim.api.nvim_buf_get_option(bufnr, "ft")
+  gui.new_list_view({items = results, ft = ft, api = ' '})
 end
 
-local function outgoing_calls_handler(bang, err, method, result, client_id, bufnr)
-  local results = call_hierarchy_handler_to(err, method, result, client_id, bufnr, "Outgoing calls not found")
+local function outgoing_calls_handler(bang, err, method, result, client_id,
+                                      bufnr)
+  local results = call_hierarchy_handler_to(err, method, result, client_id,
+                                            bufnr, "Outgoing calls not found")
 
-  gui.new_list_view({items =results, api = ' '})
-  --fzf_locations(bang, "", "Outgoing Calls", results, false)
+  local ft = vim.api.nvim_buf_get_option(bufnr, "ft")
+  gui.new_list_view({items = results, ft = ft, api = ' '})
+  -- fzf_locations(bang, "", "Outgoing Calls", results, false)
 end
 
-
 function M.incoming_calls(bang, opts)
-  assert(#vim.lsp.buf_get_clients() > 0, "Must have a client running to use lsp_tags")
-  if not lsphelper.check_capabilities("call_hierarchy") then
-    return
-  end
+  assert(#vim.lsp.buf_get_clients() > 0,
+         "Must have a client running to use lsp_tags")
+  if not lsphelper.check_capabilities("call_hierarchy") then return end
 
   local params = vim.lsp.util.make_position_params()
-  util.call_sync("callHierarchy/incomingCalls", params, opts, partial(incoming_calls_handler, bang))
+  util.call_sync("callHierarchy/incomingCalls", params, opts,
+                 partial(incoming_calls_handler, bang))
 end
 
 function M.outgoing_calls(bang, opts)
-  assert(#vim.lsp.buf_get_clients() > 0, "Must have a client running to use lsp_tags")
-  if not lsphelper.check_capabilities("call_hierarchy") then
-    return
-  end
+  assert(#vim.lsp.buf_get_clients() > 0,
+         "Must have a client running to use lsp_tags")
+  if not lsphelper.check_capabilities("call_hierarchy") then return end
 
   local params = vim.lsp.util.make_position_params()
-  util.call_sync("callHierarchy/outgoingCalls", params, opts, partial(outgoing_calls_handler, bang))
+  util.call_sync("callHierarchy/outgoingCalls", params, opts,
+                 partial(outgoing_calls_handler, bang))
 end
 
 M.incoming_calls_call = partial(M.incoming_calls, 0)
diff --git a/lua/navigator/implementation.lua b/lua/navigator/implementation.lua
index 4c8f36f..3a5b150 100644
--- a/lua/navigator/implementation.lua
+++ b/lua/navigator/implementation.lua
@@ -17,20 +17,18 @@ end
 
 local function implementation_handler(bang, err, method, result, client_id, bufnr)
   local results = location_handler(err, method, result, client_id, bufnr, "Implementation not found")
-  gui.new_list_view({items =results, api = 'Implementation'})
+  local ft = vim.api.nvim_buf_get_option(bufnr, "ft")
+  gui.new_list_view({items = results, ft = ft, api = 'Implementation'})
 end
 
 function M.implementation(bang, opts)
-  if not lsphelper.check_capabilities("implementation") then
-    return
-  end
+  if not lsphelper.check_capabilities("implementation") then return end
 
   local params = vim.lsp.util.make_position_params()
+
   util.call_sync("textDocument/implementation", params, opts, partial(implementation_handler, bang))
 end
 
-
-
 M.implementation_call = partial(M.implementation, 0)
 
 M.implementation_handler = partial(implementation_handler, 0)
diff --git a/lua/navigator/lspclient/attach.lua b/lua/navigator/lspclient/attach.lua
index baa62ba..ec39633 100644
--- a/lua/navigator/lspclient/attach.lua
+++ b/lua/navigator/lspclient/attach.lua
@@ -3,6 +3,7 @@ local lsp = require("vim.lsp")
 
 local util = require "navigator.util"
 local log = util.log
+local verbose = util.verbose
 
 local diagnostic_map = function(bufnr)
   local opts = {noremap = true, silent = true}
@@ -11,37 +12,41 @@ end
 local M = {}
 
 M.on_attach = function(client, bufnr)
-  log("attaching")
+  local uri = vim.uri_from_bufnr(bufnr)
 
-  local hassig, sig = pcall(require, "lsp_signature")
-  if hassig then
-    sig.on_attach()
+  log("loading for ft ", ft, uri)
+  if uri == 'file://' or uri == 'file:///' then
+    log("skip loading for ft ", ft, uri)
+    return
   end
+  log("attaching", bufnr)
+  verbose(client)
+  local hassig, sig = pcall(require, "lsp_signature")
+  if hassig then sig.on_attach() end
   diagnostic_map(bufnr)
   -- lspsaga
-  require "navigator.lspclient.highlight".add_highlight()
+  require"navigator.lspclient.highlight".add_highlight()
 
   api.nvim_buf_set_option(bufnr, "omnifunc", "v:lua.vim.lsp.omnifunc")
 
-  require("navigator.lspclient.mapping").setup({client = client, bufnr = bufnr, cap = client.resolved_capabilities})
+  require("navigator.lspclient.mapping").setup({
+    client = client,
+    bufnr = bufnr,
+    cap = client.resolved_capabilities
+  })
 
   if client.resolved_capabilities.document_highlight then
     require("navigator.dochighlight").documentHighlight()
   end
 
-  require "navigator.lspclient.lspkind".init()
-
+  require"navigator.lspclient.lspkind".init()
 
   local capabilities = vim.lsp.protocol.make_client_capabilities()
   capabilities.textDocument.completion.completionItem.snippetSupport = true
-  local config = require "navigator".config_value
-  if config ~= nil and config.on_attach ~= nil then
-    config.on_attach(client, bufnr)
-  end
+  local config = require"navigator".config_value
+  if config ~= nil and config.on_attach ~= nil then config.on_attach(client, bufnr) end
 end
 
-M.setup = function(cfg)
-  return M
-end
+M.setup = function(cfg) return M end
 
 return M
diff --git a/lua/navigator/lspclient/clients.lua b/lua/navigator/lspclient/clients.lua
index b160b5c..e6174fb 100644
--- a/lua/navigator/lspclient/clients.lua
+++ b/lua/navigator/lspclient/clients.lua
@@ -1,29 +1,26 @@
 -- todo allow config passed in
-local log = require "navigator.util".log
-local verbose = require "navigator.util".verbose
+local log = require"navigator.util".log
+local verbose = require"navigator.util".verbose
 
 _Loading = false
 
 if packer_plugins ~= nil then
   -- packer installed
-  local loader = require "packer".loader
-  if not packer_plugins["neovim/nvim-lspconfig"] or not packer_plugins["neovim/nvim-lspconfig"].loaded then
-    loader("nvim-lspconfig")
-  end
+  local loader = require"packer".loader
+  if not packer_plugins["neovim/nvim-lspconfig"] or
+      not packer_plugins["neovim/nvim-lspconfig"].loaded then loader("nvim-lspconfig") end
   if not packer_plugins["ray-x/guihua.lua"] or not packer_plugins["guihua.lua"].loaded then
     loader("guihua.lua")
-  -- if lazyloading
+    -- if lazyloading
   end
 end
 
 local has_lsp, lspconfig = pcall(require, "lspconfig")
-if not has_lsp then
-  error("loading lsp config")
-end
+if not has_lsp then error("loading lsp config") end
 local highlight = require "navigator.lspclient.highlight"
 
 local util = lspconfig.util
-local config = require "navigator".config_values()
+local config = require"navigator".config_values()
 
 local cap = vim.lsp.protocol.make_client_capabilities()
 local on_attach = require("navigator.lspclient.attach").on_attach
@@ -32,6 +29,37 @@ local on_attach = require("navigator.lspclient.attach").on_attach
 -- lua setup
 local sumneko_root_path = config.sumneko_root_path
 local sumneko_binary = config.sumneko_binary
+local library = {}
+
+local path = vim.split(package.path, ";")
+
+table.insert(path, "lua/?.lua")
+table.insert(path, "lua/?/init.lua")
+
+local function add(lib)
+  for _, p in pairs(vim.fn.expand(lib, false, true)) do
+    p = vim.loop.fs_realpath(p)
+    library[p] = true
+  end
+end
+
+-- add runtime
+add("$VIMRUNTIME")
+
+-- add your config
+local home = vim.fn.expand("$HOME")
+if vim.fn.isdirectory(home .. "/.config/nvim") then add(home .. "/.config/nvim") end
+
+-- add plugins it may be very slow to add all in path
+-- if vim.fn.isdirectory(home .. "/.config/share/nvim/site/pack/packer") then
+--   add(home .. "/.local/share/nvim/site/pack/packer/opt/*")
+--   add(home .. "/.local/share/nvim/site/pack/packer/start/*")
+-- end
+
+library[vim.fn.expand("$VIMRUNTIME/lua")] = true
+library[vim.fn.expand("$VIMRUNTIME/lua/vim")] = true
+library[vim.fn.expand("$VIMRUNTIME/lua/vim/lsp")] = true
+-- [vim.fn.expand("~/repos/nvim/lua")] = true
 
 local setups = {
   gopls = {
@@ -40,11 +68,8 @@ local setups = {
     filetypes = {"go", "gomod"},
     message_level = vim.lsp.protocol.MessageType.Error,
     cmd = {
-      "gopls",
-      -- share the gopls instance if there is one already
-      "-remote=auto",
-      --[[ debug options ]]
-      --
+      "gopls", -- share the gopls instance if there is one already
+      "-remote=auto", --[[ debug options ]] --
       -- "-logfile=auto",
       -- "-debug=:0",
       "-remote.debug=:0"
@@ -73,10 +98,7 @@ local setups = {
   },
   clangd = {
     cmd = {
-      "clangd",
-      "--background-index",
-      "--suggest-missing-includes",
-      "--clang-tidy",
+      "clangd", "--background-index", "--suggest-missing-includes", "--clang-tidy",
       "--header-insertion=iwyu"
     },
     filetypes = {"c", "cpp", "objc", "objcpp"},
@@ -87,7 +109,8 @@ local setups = {
   },
   rust_analyzer = {
     root_dir = function(fname)
-      return util.root_pattern("Cargo.toml", "rust-project.json", ".git")(fname) or util.path.dirname(fname)
+      return util.root_pattern("Cargo.toml", "rust-project.json", ".git")(fname) or
+                 util.path.dirname(fname)
     end,
     filetypes = {"rust"},
     message_level = vim.lsp.protocol.MessageType.error,
@@ -105,7 +128,7 @@ local setups = {
     on_attach = function(client, bufnr)
       client.resolved_capabilities.execute_command = true
       highlight.diagnositc_config_sign()
-      require "sqls".setup {picker = "telescope"} -- or default
+      require"sqls".setup {picker = "telescope"} -- or default
     end,
     settings = {
       cmd = {"sqls", "-config", "$HOME/.config/sqls/config.yml"}
@@ -133,25 +156,16 @@ local setups = {
         diagnostics = {
           enable = true,
           -- Get the language server to recognize the `vim` global
-          globals = {
-            "vim",
-            "describe",
-            "it",
-            "before_each",
-            "after_each",
-            "teardown",
-            "pending"
-          }
+          globals = {"vim", "describe", "it", "before_each", "after_each", "teardown", "pending"}
         },
+        completion = {callSnippet = "Both"},
         workspace = {
           -- Make the server aware of Neovim runtime files
-          library = {
-            [vim.fn.expand("$VIMRUNTIME/lua")] = true,
-            [vim.fn.expand("$VIMRUNTIME/lua/vim")] = true,
-            [vim.fn.expand("$VIMRUNTIME/lua/vim/lsp")] = true
-            -- [vim.fn.expand("~/repos/nvim/lua")] = true
-          }
-        }
+          library = library,
+          maxPreload = 256,
+          preloadFileSize = 50000
+        },
+        telemetry = {enable = false}
       }
     }
   },
@@ -172,49 +186,17 @@ local setups = {
     init_options = {
       compilationDatabaseDirectory = "build",
       root_dir = [[ util.root_pattern("compile_commands.json", "compile_flags.txt", "CMakeLists.txt", "Makefile", ".git") or util.path.dirname ]],
-      index = {
-        threads = 2
-      },
-      clang = {
-        excludeArgs = {"-frounding-math"}
-      }
+      index = {threads = 2},
+      clang = {excludeArgs = {"-frounding-math"}}
     }
   }
 }
 
 local servers = {
-  "angularls",
-  "gopls",
-  "tsserver",
-  "flow",
-  "bashls",
-  "dockerls",
-  "julials",
-  "pyls",
-  "pyright",
-  "jedi_language_server",
-  "jdtls",
-  "sumneko_lua",
-  "vimls",
-  "html",
-  "jsonls",
-  "solargraph",
-  "cssls",
-  "yamlls",
-  "clangd",
-  "ccls",
-  "sqls",
-  "denols",
-  "dartls",
-  "dotls",
-  "kotlin_language_server",
-  "nimls",
-  "intelephense",
-  "vuels",
-  "phpactor",
-  "omnisharp",
-  "r_language_server",
-  "rust_analyzer",
+  "angularls", "gopls", "tsserver", "flow", "bashls", "dockerls", "julials", "pyls", "pyright",
+  "jedi_language_server", "jdtls", "sumneko_lua", "vimls", "html", "jsonls", "solargraph", "cssls",
+  "yamlls", "clangd", "ccls", "sqls", "denols", "dartls", "dotls", "kotlin_language_server",
+  "nimls", "intelephense", "vuels", "phpactor", "omnisharp", "r_language_server", "rust_analyzer",
   "terraformls"
 }
 
@@ -232,16 +214,12 @@ local function load_cfg(ft, client, cfg, loaded)
 
   local should_load = false
   if lspft ~= nil and #lspft > 0 then
-    for _, value in ipairs(lspft) do
-      if ft == value then
-        should_load = true
-      end
-    end
+    for _, value in ipairs(lspft) do if ft == value then should_load = true end end
     if should_load then
       for _, c in pairs(loaded) do
         if client == c then
           -- loaded
-          log(client, "already been loaded for", ft, loaded)
+          verbose(client, "already been loaded for", ft, loaded)
           return
         end
       end
@@ -258,35 +236,27 @@ local function wait_lsp_startup(ft, retry)
   local loaded = {}
   for i = 1, 2 do
     for _, client in ipairs(clients) do
-      if client ~= nil then
-        table.insert(loaded, client.name)
-      end
+      if client ~= nil then table.insert(loaded, client.name) end
     end
     for _, lspclient in ipairs(servers) do
       local cfg = setups[lspclient] or default_cfg
       load_cfg(ft, lspclient, cfg, loaded)
     end
-    if not retry or ft == nil then
-      return
-    end
+    if not retry or ft == nil then return end
     --
     local timer = vim.loop.new_timer()
     local i = 0
-    vim.wait(
-      1000,
-      function()
-        clients = vim.lsp.get_active_clients() or {}
-        i = i + 1
-        if i > 5 or #clients > 0 then
-          timer:close() -- Always close handles to avoid leaks.
-          log("active", #clients, i)
-          _Loading = false
-          return true
-        end
+    vim.wait(1000, function()
+      clients = vim.lsp.get_active_clients() or {}
+      i = i + 1
+      if i > 5 or #clients > 0 then
+        timer:close() -- Always close handles to avoid leaks.
+        verbose("active", #clients, i)
         _Loading = false
-      end,
-      200
-    )
+        return true
+      end
+      _Loading = false
+    end, 200)
   end
 end
 
@@ -294,39 +264,36 @@ vim.cmd([[autocmd FileType * lua require'navigator.lspclient.clients'.setup()]])
 
 local function setup(user_opts)
   verbose(debug.traceback())
-  if _Loading == true then
+  if lspconfig == nil then
+    error("lsp-config need installed and enabled")
     return
   end
+
+  if _Loading == true then return end
   local ft = vim.bo.filetype
-  if ft == nil then
-    ft = vim.api.nvim_buf_get_option(0, "filetype")
-  end
+  if ft == nil then ft = vim.api.nvim_buf_get_option(0, "filetype") end
 
   if ft == nil or ft == "" then
     log("nil filetype")
     return
   end
-  log("loading for ft ", ft)
   local retry = true
   local disable_ft = {
-    "NvimTree",
-    "guihua",
-    "clap_input",
-    "clap_spinner",
-    "vista",
-    "TelescopePrompt",
-    "csv",
-    "txt",
-    "markdown",
-    "defx"
+    "NvimTree", "guihua", "clap_input", "clap_spinner", "vista", "vista_kind", "TelescopePrompt",
+    "csv", "txt", "markdown", "defx"
   }
   for i = 1, #disable_ft do
     if ft == disable_ft[i] then
+      log("navigator disabled for ft", ft)
       return
     end
   end
-  if lspconfig == nil then
-    error("lsp-config need installed and enabled")
+  local bufnr = vim.fn.bufnr()
+  local uri = vim.uri_from_bufnr(bufnr)
+
+  log("loading for ft ", ft, uri)
+  if uri == 'file://' or uri == 'file:///' then
+    log("skip loading for ft ", ft, uri)
     return
   end
 
diff --git a/lua/navigator/lspclient/lspkind.lua b/lua/navigator/lspclient/lspkind.lua
index c8051ec..7cf37dc 100644
--- a/lua/navigator/lspclient/lspkind.lua
+++ b/lua/navigator/lspclient/lspkind.lua
@@ -23,37 +23,13 @@ local kind_symbols = {
   Struct = " ",
   Event = "ﳅ",
   Operator = "",
-  TypeParameter = "",
+  TypeParameter = " ",
   Default = ""
 }
 
 local CompletionItemKind = {
-  " ",
-  "𝔉 ",
-  "ⓕ ",
-  " ",
-  "ﴲ ",
-  " ",
-  " ",
-  "ﰮ ",
-  " ",
-  " ",
-  " ",
-  " ",
-  "𝕰 ",
-  " ",
-  "﬌ ",
-  " ",
-  " ",
-  " ",
-  " ",
-  " ",
-  " ",
-  " ",
-  "ﳅ ",
-  " ",
-  " ",
-  " "
+  " ", "𝔉 ", "ⓕ ", " ", "ﴲ ", " ", " ", "ﰮ ", " ", " ", " ", " ", "𝕰 ", " ",
+  "﬌ ", " ", " ", " ", " ", " ", " ", " ", "ﳅ ", " ", " ", " "
 }
 
 -- A symbol kind.
@@ -87,18 +63,14 @@ local SymbolKind = {
 }
 
 local SymbolItemKind = {
-  " ", " ", " ", " ", "פּ ", "ƒ ", " ", "ﴲ ", " ", "𝕰 ", "蘒", " ", " ", " ", " ", " ", " ", " ", " ", " ", "ﳠ ", " ", " ", "ﳅ ", " ", " ", " " }
+  " ", " ", " ", " ", "פּ ", "ƒ ", " ", "ﴲ ", " ", "𝕰 ", "蘒", " ", " ", " ", " ",
+  " ", " ", " ", " ", " ", "ﳠ ", " ", " ", "ﳅ ", " ", " ", " "
+}
 
 local lspkind = {}
-function lspkind.comp_kind(kind)
-  return CompletionItemKind[kind] or ""
-end
+function lspkind.comp_kind(kind) return CompletionItemKind[kind] or "" end
 
-function lspkind.symbol_kind(kind)
-  return SymbolItemKind[kind] or ""
-end
+function lspkind.symbol_kind(kind) return SymbolItemKind[kind] or "" end
 
-function lspkind.init()
-   require('vim.lsp.protocol').CompletionItemKind = CompletionItemKind
-end
+function lspkind.init() require('vim.lsp.protocol').CompletionItemKind = CompletionItemKind end
 return lspkind
diff --git a/lua/navigator/lspclient/mapping.lua b/lua/navigator/lspclient/mapping.lua
index 47d9341..96fdd11 100644
--- a/lua/navigator/lspclient/mapping.lua
+++ b/lua/navigator/lspclient/mapping.lua
@@ -3,7 +3,8 @@ local function set_keymap(...) vim.api.nvim_set_keymap(...) end
 
 local event_hdlrs = {
   {ev = "BufWritePre", func = "diagnostic.set_loclist({open_loclist = false})"},
-  {ev = "CursorHold", func = "document_highlight()"}, {ev = "CursorHoldI", func = "document_highlight()"},
+  {ev = "CursorHold", func = "document_highlight()"},
+  {ev = "CursorHoldI", func = "document_highlight()"},
   {ev = "CursorMoved", func = "clear_references()"}
 }
 
@@ -11,13 +12,15 @@ local key_maps = {
   {key = "gr", func = "references()"}, {mode = "i", key = "<M-k>", func = "signature_help()"},
   {key = "gs", func = "signature_help()"}, {key = "g0", func = "document_symbol()"},
   {key = "gW", func = "workspace_symbol()"}, {key = "<c-]>", func = "definition()"},
-  {key = "gD", func = "declaration()"}, {key = "gp", func = "require('navigator.definition').definition_preview()"},
+  {key = "gD", func = "declaration()"},
+  {key = "gp", func = "require('navigator.definition').definition_preview()"},
   {key = "gT", func = "require('navigator.treesitter').buf_ts()"},
   {key = "GT", func = "require('navigator.treesitter').bufs_ts()"}, {key = "K", func = "hover()"},
-  {key = "ga", mode = "n", func = "code_action()"}, {key = "ga", mode = "v", func = "range_code_action()"},
-  {key = "<Leader>re", func = "rename()"}, {key = "<Leader>gi", func = "incoming_calls()"},
-  {key = "<Leader>go", func = "outgoing_calls()"}, {key = "gi", func = "implementation()"},
-  {key = "gt", func = "type_definition()"}, {key = "gL", func = "diagnostic.show_line_diagnostics()"},
+  {key = "ga", mode = "n", func = "code_action()"},
+  {key = "ga", mode = "v", func = "range_code_action()"}, {key = "<Leader>re", func = "rename()"},
+  {key = "<Leader>gi", func = "incoming_calls()"}, {key = "<Leader>go", func = "outgoing_calls()"},
+  {key = "gi", func = "implementation()"}, {key = "gt", func = "type_definition()"},
+  {key = "gL", func = "diagnostic.show_line_diagnostics()"},
   {key = "gG", func = "require('navigator.diagnostics').show_diagnostic()"},
   {key = "]d", func = "diagnostic.goto_next()"}, {key = "[d", func = "diagnostic.goto_prev()"},
   {key = "]r", func = "require('navigator.treesitter').goto_next_usage()"},
@@ -77,7 +80,9 @@ local function set_mapping(user_opts)
     vim.cmd([[autocmd BufWritePre <buffer> lua vim.lsp.buf.formatting()]])
   end
   -- if user_opts.cap.document_range_formatting then
-  if range_fmt then buf_set_keymap("v", "<space>ff", "<cmd>lua vim.lsp.buf.range_formatting()<CR>", opts) end
+  if range_fmt then
+    buf_set_keymap("v", "<space>ff", "<cmd>lua vim.lsp.buf.range_formatting()<CR>", opts)
+  end
 end
 
 local function set_event_handler(user_opts)
@@ -94,7 +99,8 @@ local function set_event_handler(user_opts)
     else
       f = "lua vim.lsp.buf." .. value.func
     end
-    local cmd = "autocmd FileType " .. file_types .. " autocmd nvim_lsp_autos " .. value.ev .. " <buffer> silent! " .. f
+    local cmd = "autocmd FileType " .. file_types .. " autocmd nvim_lsp_autos " .. value.ev ..
+                    " <buffer> silent! " .. f
     vim.api.nvim_command(cmd)
   end
   vim.api.nvim_command([[augroup END]])
@@ -110,8 +116,10 @@ function M.setup(user_opts)
   set_event_handler(user_opts)
   local cap = user_opts.cap or {}
   if cap.call_hierarchy or cap.callHierarchy then
-    vim.lsp.handlers["callHierarchy/incomingCalls"] = require"navigator.hierarchy".incoming_calls_handler
-    vim.lsp.handlers["callHierarchy/outgoingCalls"] = require"navigator.hierarchy".outgoing_calls_handler
+    vim.lsp.handlers["callHierarchy/incomingCalls"] =
+        require"navigator.hierarchy".incoming_calls_handler
+    vim.lsp.handlers["callHierarchy/outgoingCalls"] =
+        require"navigator.hierarchy".outgoing_calls_handler
   end
 
   vim.lsp.handlers["textDocument/references"] = require"navigator.reference".reference_handler
@@ -122,15 +130,21 @@ function M.setup(user_opts)
     vim.lsp.handlers["textDocument/declaration"] = require"navigator.definition".declaration_handler
   end
 
-  vim.lsp.handlers["textDocument/typeDefinition"] = require"navigator.definition".typeDefinition_handler
-  vim.lsp.handlers["textDocument/implementation"] = require"navigator.implementation".implementation_handler
+  vim.lsp.handlers["textDocument/typeDefinition"] =
+      require"navigator.definition".typeDefinition_handler
+  vim.lsp.handlers["textDocument/implementation"] =
+      require"navigator.implementation".implementation_handler
 
-  vim.lsp.handlers["textDocument/documentSymbol"] = require"navigator.symbols".document_symbol_handler
+  vim.lsp.handlers["textDocument/documentSymbol"] =
+      require"navigator.symbols".document_symbol_handler
   vim.lsp.handlers["workspace/symbol"] = require"navigator.symbols".workspace_symbol_handler
-  vim.lsp.handlers["textDocument/publishDiagnostics"] = require"navigator.diagnostics".diagnostic_handler
+  vim.lsp.handlers["textDocument/publishDiagnostics"] =
+      require"navigator.diagnostics".diagnostic_handler
 
   local hassig, sig = pcall(require, "lsp_signature")
-  if not hassig then vim.lsp.handlers["textDocument/signatureHelp"] = require"navigator.signature".signature_handler end
+  if not hassig then
+    vim.lsp.handlers["textDocument/signatureHelp"] = require"navigator.signature".signature_handler
+  end
 
   -- vim.lsp.handlers["textDocument/hover"]  = require 'navigator.hover'.hover_handler
 end
diff --git a/lua/navigator/lspwrapper.lua b/lua/navigator/lspwrapper.lua
index 8139ca4..c8d5088 100644
--- a/lua/navigator/lspwrapper.lua
+++ b/lua/navigator/lspwrapper.lua
@@ -2,10 +2,18 @@ local M = {}
 local util = require "navigator.util"
 local gutil = require "guihua.util"
 local lsp = require "vim.lsp"
-local log = require "navigator.util".log
-local symbol_kind = require "navigator.lspclient.lspkind".symbol_kind
+local api = vim.api
+local log = require"navigator.util".log
+local verbose = require"navigator.util".verbose
+local symbol_kind = require"navigator.lspclient.lspkind".symbol_kind
 local cwd = vim.fn.getcwd(0)
 cwd = gutil.add_pec(cwd)
+ts_nodes = {}
+ts_nodes_time = {}
+local ts_enabled, ts_locals = pcall(require, "nvim-treesitter.locals")
+
+local calltree_enabled = require"navigator".config_values().treesitter_call_tree
+
 function M.lines_from_locations(locations, include_filename)
   local fnamemodify = (function(filename)
     if include_filename then
@@ -17,10 +25,8 @@ function M.lines_from_locations(locations, include_filename)
 
   local lines = {}
   for _, loc in ipairs(locations) do
-    table.insert(
-      lines,
-      (fnamemodify(loc["filename"]) .. loc["lnum"] .. ":" .. loc["col"] .. ": " .. vim.trim(loc["text"]))
-    )
+    table.insert(lines, (fnamemodify(loc["filename"]) .. loc["lnum"] .. ":" .. loc["col"] .. ": " ..
+                     vim.trim(loc["text"])))
   end
 
   return lines
@@ -35,11 +41,9 @@ function M.symbols_to_items(result)
       item.kind = result[i].kind
 
       local kind = symbol_kind(item.kind)
-      item.name = result[i].name --symbol name
+      item.name = result[i].name -- symbol name
       item.text = result[i].name
-      if kind ~= nil then
-        item.text = kind .. ": " .. item.text
-      end
+      if kind ~= nil then item.text = kind .. ": " .. item.text end
       item.filename = vim.uri_to_fname(item.uri)
 
       item.display_filename = item.filename:gsub(cwd .. "/", "./", 1)
@@ -48,9 +52,7 @@ function M.symbols_to_items(result)
       end
       item.lnum = item.range.start.line + 1
 
-      if item.containerName ~= nil then
-        item.text = " " .. item.containerName .. item.text
-      end
+      if item.containerName ~= nil then item.text = " " .. item.containerName .. item.text end
       table.insert(locations, item)
     end
   end
@@ -63,9 +65,7 @@ local function extract_result(results_lsp)
   if results_lsp then
     local results = {}
     for _, server_results in pairs(results_lsp) do
-      if server_results.result then
-        vim.list_extend(results, server_results.result)
-      end
+      if server_results.result then vim.list_extend(results, server_results.result) end
     end
 
     return results
@@ -78,9 +78,7 @@ function M.check_capabilities(feature, client_id)
   local supported_client = false
   for _, client in pairs(clients) do
     supported_client = client.resolved_capabilities[feature]
-    if supported_client then
-      goto continue
-    end
+    if supported_client then goto continue end
   end
 
   ::continue::
@@ -99,7 +97,8 @@ end
 function M.call_sync(method, params, opts, handler)
   params = params or {}
   opts = opts or {}
-  local results_lsp, err = lsp.buf_request_sync(0, method, params, opts.timeout or vim.g.navtator_timeout)
+  local results_lsp, err = lsp.buf_request_sync(0, method, params,
+                                                opts.timeout or vim.g.navtator_timeout or 1000)
 
   handler(err, method, extract_result(results_lsp), nil, nil)
 end
@@ -110,44 +109,86 @@ function M.call_async(method, params, handler)
     util.show(...)
     handler(...)
   end
-  return  lsp.buf_request(0, method, params, callback)
+  return lsp.buf_request(0, method, params, callback)
   -- results_lsp, canceller
 end
 
+local function ts_functions(uri)
+  if not ts_enabled or not calltree_enabled then return nil end
+  local ts_func = require"navigator.treesitter".buf_func
+  local bufnr = vim.uri_to_bufnr(uri)
+  local x = os.clock()
+  if ts_nodes[uri] ~= nil then
+    local t = ts_nodes_time[uri]
+    local fname = vim.uri_to_fname(uri)
+    local modified = vim.fn.getftime(fname)
+    if modified < t then return ts_nodes[uri] end
+  end
+  local unload = false
+  if not api.nvim_buf_is_loaded(bufnr) then
+    log("! load buf !", uri, bufnr)
+    vim.fn.bufload(bufnr)
+    unload = true
+  end
+
+  local funcs = ts_func(bufnr)
+  if unload then
+    local cmd = string.format("bd %d", bufnr)
+    log(cmd)
+    -- vim.cmd(cmd)  -- todo: not sure if it is needed
+  end
+  ts_nodes[uri] = funcs
+  ts_nodes_time[uri] = os.time()
+  verbose(funcs)
+  log(string.format("elapsed time: %.4f\n", os.clock() - x))
+  return funcs
+end
+
+local function find_ts_func_by_range(funcs, range)
+  if funcs == nil or range == nil then return nil end
+  local result = {}
+  verbose(funcs, range)
+  for _, value in pairs(funcs) do
+    local func_range = value.node_scope
+    -- note treesitter is C style
+    if func_range and func_range.start.line + 1 <= range.start.line and func_range['end'].line + 1 >=
+        range['end'].line then table.insert(result, value) end
+  end
+  return result
+end
+
 function M.locations_to_items(locations)
   if not locations or vim.tbl_isempty(locations) then
     print("list not avalible")
     return
   end
+  local width = 4
 
   local items = {} -- lsp.util.locations_to_items(locations)
   -- items and locations may not matching
-  table.sort(
-    locations,
-    function(i, j)
-      if i.uri == j.uri then
-        if i.range and i.range.start then
-          return i.range.start.line < j.range.start.line
-        end
-        return false
-      else
-        return i.uri < j.uri
-      end
+  table.sort(locations, function(i, j)
+    if i.uri == j.uri then
+      if i.range and i.range.start then return i.range.start.line < j.range.start.line end
+      return false
+    else
+      return i.uri < j.uri
     end
-  )
+  end)
   for i, loc in ipairs(locations) do
     local item = lsp.util.locations_to_items({loc})[1]
     item.uri = locations[i].uri
+    local funcs = ts_functions(item.uri)
     item.range = locations[i].range
     item.filename = assert(vim.uri_to_fname(item.uri))
     local filename = item.filename:gsub(cwd .. "/", "./", 1)
     item.display_filename = filename or item.filename
-
+    item.call_by = find_ts_func_by_range(funcs, item.range)
     item.rpath = util.get_relative_path(cwd, item.filename)
     table.insert(items, item)
+    width = math.max(width, #item.text)
   end
 
-  return items
+  return items, width + 15
 end
 
 function M.symbol_to_items(locations)
@@ -158,20 +199,15 @@ function M.symbol_to_items(locations)
 
   local items = {} -- lsp.util.locations_to_items(locations)
   -- items and locations may not matching
-  table.sort(
-    locations,
-    function(i, j)
-      if i.uri == j.uri then
-        if i.range and i.range.start then
-          return i.range.start.line < j.range.start.line
-        end
-        return false
-      else
-        return i.uri < j.uri
-      end
+  table.sort(locations, function(i, j)
+    if i.uri == j.uri then
+      if i.range and i.range.start then return i.range.start.line < j.range.start.line end
+      return false
+    else
+      return i.uri < j.uri
     end
-  )
-  for i, loc in ipairs(locations) do
+  end)
+  for i, _ in ipairs(locations) do
     local item = {} -- lsp.util.locations_to_items({loc})[1]
     item.uri = locations[i].uri
     item.range = locations[i].range
diff --git a/lua/navigator/reference.lua b/lua/navigator/reference.lua
index 678502c..9c57b02 100644
--- a/lua/navigator/reference.lua
+++ b/lua/navigator/reference.lua
@@ -3,39 +3,51 @@ local log = util.log
 local lsphelper = require "navigator.lspwrapper"
 local gui = require "navigator.gui"
 local lsp = require "navigator.lspwrapper"
-local verbose = require "navigator.util".verbose
+local verbose = require"navigator.util".verbose
 -- local log = util.log
 -- local partial = util.partial
 -- local cwd = vim.fn.getcwd(0)
 -- local lsphelper = require "navigator.lspwrapper"
 local locations_to_items = lsphelper.locations_to_items
 
---vim.api.nvim_set_option("navtator_options", {width = 90, height = 60, location = require "navigator.location".center})
+-- vim.api.nvim_set_option("navtator_options", {width = 90, height = 60, location = require "navigator.location".center})
 -- local options = vim.g.navtator_options or {width = 60, height = 40, location = location.center}
-local function ref_hdlr(arg1, api, locations, num, bufnr)
+local function ref_hdlr(err, api, locations, num, bufnr)
   local opts = {}
   -- log("arg1", arg1)
   -- log(api)
   -- log(locations)
   -- log("num", num)
   -- log("bfnr", bufnr)
+  if err ~= nil then
+    print('ref callback error, lsp may not ready', err)
+    return
+  end
+  if type(locations) ~= 'table' then
+    log("arg1", arg1)
+    log(api)
+    log(locations)
+    log("num", num)
+    log("bfnr", bufnr)
+    error(locations)
+  end
   if locations == nil or vim.tbl_isempty(locations) then
     print "References not found"
     return
   end
-  verbose(locations)
-  local items = locations_to_items(locations)
-  gui.new_list_view({items = items, api = "Reference"})
+  local items, width = locations_to_items(locations)
+  local ft = vim.api.nvim_buf_get_option(bufnr, "ft")
+
+  local wwidth = vim.api.nvim_get_option("columns")
+  width = math.min(width + 24 or 120, math.floor(wwidth * 0.8))
+  gui.new_list_view({items = items, ft = ft, width = width, api = "Reference"})
 end
 
 local async_reference_request = function()
-  local method = {"textDocument/references"}
   local ref_params = vim.lsp.util.make_position_params()
   ref_params.context = {includeDeclaration = true}
-  return lsp.call_async(method[1], ref_params, ref_hdlr) -- return asyncresult, canceller
+  lsp.call_async("textDocument/references", ref_params, ref_hdlr) -- return asyncresult, canceller
+  -- lsp.call_async("textDocument/definition", ref_params, ref_hdlr) -- return asyncresult, canceller
 end
 
-return {
-  reference_handler = ref_hdlr,
-  show_reference = async_reference_request
-}
+return {reference_handler = ref_hdlr, show_reference = async_reference_request}
diff --git a/lua/navigator/symbols.lua b/lua/navigator/symbols.lua
index ddd7167..2934071 100644
--- a/lua/navigator/symbols.lua
+++ b/lua/navigator/symbols.lua
@@ -1,10 +1,10 @@
 local gui = require "navigator.gui"
 local M = {}
-local log = require "navigator.util".log
+local log = require"navigator.util".log
 local lsphelper = require "navigator.lspwrapper"
 local locations_to_items = lsphelper.locations_to_items
-local clone = require "guihua.util".clone
-local symbol_kind = require "navigator.lspclient.lspkind".symbol_kind
+local clone = require"guihua.util".clone
+local symbol_kind = require"navigator.lspclient.lspkind".symbol_kind
 local symbols_to_items = lsphelper.symbols_to_items
 
 -- function M.document_symbols(opts)
@@ -46,7 +46,8 @@ function M.workspace_symbols(opts)
   local params = vim.lsp.util.make_position_params()
   params.context = {includeDeclaration = true}
   params.query = opts.prompt or ""
-  local results_lsp = vim.lsp.buf_request_sync(0, "workspace/symbol", params, lspopts.timeout or 15000)
+  local results_lsp = vim.lsp.buf_request_sync(0, "workspace/symbol", params,
+                                               lspopts.timeout or 15000)
   if not results_lsp or vim.tbl_isempty(results_lsp) then
     print(bufnr, "symbol not found for buf")
     return
@@ -54,16 +55,18 @@ function M.workspace_symbols(opts)
   -- result_lsp
   local result = {}
   for i = 1, #results_lsp do
-    if results_lsp[i] ~= nil and results_lsp[i].result ~= nil and #results_lsp[i].result > 0 then
-      result = results_lsp[i].result
-    end
+    if results_lsp[i] ~= nil and results_lsp[i].result ~= nil and
+        #results_lsp[i].result > 0 then result = results_lsp[i].result end
   end
 
   local items = symbols_to_items(result)
   -- log(#items, items[1])
 
+  local ft = vim.api.nvim_buf_get_option(0, "ft")
+
   if #items > 0 then
     lspopts.items = items
+    lspopts.ft = ft
     gui.new_list_view(lspopts)
   else
     print("symbols not found")
@@ -71,9 +74,7 @@ function M.workspace_symbols(opts)
 end
 
 function M.document_symbol_handler(err, _, result, _, bufnr)
-  if err then
-    print(bufnr, "failed to get document symbol")
-  end
+  if err then print(bufnr, "failed to get document symbol") end
 
   if not result or vim.tbl_isempty(result) then
     print(bufnr, "symbol not found for buf")
@@ -94,9 +95,7 @@ function M.document_symbol_handler(err, _, result, _, bufnr)
     item.uri = uri
     item.selectionRange = result[i].selectionRange
     item.detail = result[i].detail or ""
-    if item.detail == "()" then
-      item.detail = "func"
-    end
+    if item.detail == "()" then item.detail = "func" end
 
     item.lnum = result[i].range.start.line + 1
     item.text = "[" .. kind .. "]" .. item.detail .. " " .. item.name
@@ -116,14 +115,23 @@ function M.document_symbol_handler(err, _, result, _, bufnr)
         child.uri = uri
         child.lnum = c.range.start.line + 1
         child.detail = c.detail or ""
-        child.text = "   [" .. ckind .. "] " .. child.detail .. " " .. child.name
+        child.text = "   [" .. ckind .. "] " .. child.detail .. " " ..
+                         child.name
         table.insert(locations, child)
       end
     end
   end
+
+  local ft = vim.api.nvim_buf_get_option(bufnr, "ft")
   -- verbose(locations)
   -- local items = locations_to_items(locations)
-  gui.new_list_view({items = locations, prompt = true, rawdata = true, api = " "})
+  gui.new_list_view({
+    items = locations,
+    prompt = true,
+    rawdata = true,
+    ft = ft,
+    api = " "
+  })
 
   -- if locations == nil or vim.tbl_isempty(locations) then
   --   print "References not found"
@@ -147,9 +155,7 @@ function M.document_symbol_handler(err, _, result, _, bufnr)
 end
 
 function M.workspace_symbol_handler(err, _, result, _, bufnr)
-  if err then
-    print(bufnr, "failed to get workspace symbol")
-  end
+  if err then print(bufnr, "failed to get workspace symbol") end
   if not result or vim.tbl_isempty(result) then
     print(bufnr, "symbol not found for buf")
     return
@@ -170,7 +176,15 @@ function M.workspace_symbol_handler(err, _, result, _, bufnr)
   --   table.insert(locations, item)
   -- end
   -- local items = locations_to_items(locations)
-  gui.new_list_view({items = items, prompt = true, rowdata = true, api = " "})
+
+  local ft = vim.api.nvim_buf_get_option(bufnr, "ft")
+  gui.new_list_view({
+    items = items,
+    prompt = true,
+    ft = ft,
+    rowdata = true,
+    api = " "
+  })
 
   -- if locations == nil or vim.tbl_isempty(locations) then
   --   print "References not found"
diff --git a/lua/navigator/treesitter.lua b/lua/navigator/treesitter.lua
index 6a435c3..f087996 100644
--- a/lua/navigator/treesitter.lua
+++ b/lua/navigator/treesitter.lua
@@ -1,5 +1,9 @@
 local gui = require "navigator.gui"
-local ts_locals = require "nvim-treesitter.locals"
+
+local ok, ts_locals = pcall(require, "nvim-treesitter.locals")
+
+if not ok then error("treesitter not installed") end
+
 local parsers = require "nvim-treesitter.parsers"
 local ts_utils = require "nvim-treesitter.ts_utils"
 local utils = require "nvim-treesitter.utils"
@@ -70,26 +74,47 @@ local function prepare_node(node, kind)
   return matches
 end
 
-local function get_smallest_context(source)
-  local scopes = ts_locals.get_scopes()
+local function get_var_context(source)
+  local sbl, sbc, sel, sec = source:range()
   local current = source
+  local result = current
+  local next = ts_utils.get_next_node(source)
+  local parent = current:parent()
 
-  while current ~= nil and not vim.tbl_contains(scopes, current) do
-    current = current:parent()
-    log(current)
-    log(current.node)
-    log(current:range())
-    -- local nod = prepare_node(current)
-    -- log(nod)
+  if next == nil or parent == nil then return end
+  if next:type() == "function" or next:type() == "arrow_function" then
+    log(current:type(), current:range())
+    return parent
+  else
+    return source
   end
-  return current or nil
+  -- while current ~= nil do
+  --   log(current:type(), current:range())
+  --   if current:type() == "variable_declarator" or current:type() == "function_declaration" then
+  --     return current
+  --   end
+  --   -- local bl, bc, el, ec = current:range()
+  --   -- if bl == sbl and bc == sbc and el >= sel and ec >= sec then result = current end
+  --   current = current:parent()
+  -- end
+  -- log(current)
+end
+
+local function get_smallest_context(source)
+  local scopes = ts_locals.get_scopes()
+  local current = source
+  while current ~= nil and not vim.tbl_contains(scopes, current) do current = current:parent() end
+  log(current)
+  if current ~= nil then return current end
+  return get_var_context(source)
+  -- if source:type() == "identifier" then return get_var_context(source) end
 end
 
 local lsp_reference = require"navigator.dochighlight".goto_adjent_reference
 
 function M.goto_adjacent_usage(bufnr, delta)
   local opt = {forward = true}
-  log(delta)
+  -- log(delta)
   if delta < 0 then opt = {forward = false} end
   bufnr = bufnr or api.nvim_get_current_buf()
   local node_at_point = ts_utils.get_node_at_cursor()
@@ -132,7 +157,13 @@ local function get_all_nodes(bufnr, filter, summary)
 
   -- Force some types to act like they are parents
   -- instead of neighbors of the next nodes.
-  local containers = {["function"] = true, ["type"] = true, ["method"] = true}
+  local containers = {
+    ["function"] = true,
+    ["arrow_function"] = true,
+    ["type"] = true,
+    ["class"] = true,
+    ["method"] = true
+  }
   -- Step 2 find correct completions
   local length = 10
   local parents = {} -- stack of nodes a clever algorithm from treesiter refactor @Santos Gallegos
@@ -156,20 +187,28 @@ local function get_all_nodes(bufnr, filter, summary)
       item.kind = node.kind
       item.type = node.type
       local tsdata = node.def
-      local scope = get_smallest_context(tsdata)
+
+      log(item.type, tsdata:type())
       if node.def == nil then goto continue end
-      local start_line_node, _, _ = tsdata:start()
-      item.range = ts_utils.node_to_lsp_range(tsdata)
       item.node_text = ts_utils.get_node_text(tsdata, bufnr)[1]
+
+      local scope = get_smallest_context(tsdata)
+      if scope ~= nil then
+        -- it is strange..
+        log(item.node_text, item.kind, item.type)
+        item.node_scope = ts_utils.node_to_lsp_range(scope)
+      end
       if filter ~= nil and not filter[item.type] then goto continue end
       if summary then
-        table.insert(all_nodes, item)
+        if item.node_scope ~= nil then table.insert(all_nodes, item) end
         goto continue
       end
 
-      item.node_scope = scope
+      item.range = ts_utils.node_to_lsp_range(tsdata)
+      local start_line_node, _, _ = tsdata:start()
       if item.node_text == "_" then goto continue end
-      item.full_text = vim.trim(api.nvim_buf_get_lines(bufnr, start_line_node, start_line_node + 1, false)[1] or "")
+      item.full_text = vim.trim(api.nvim_buf_get_lines(bufnr, start_line_node, start_line_node + 1,
+                                                       false)[1] or "")
       item.uri = uri
       item.name = node.node_text
       item.filename = fname
@@ -180,24 +219,44 @@ local function get_all_nodes(bufnr, filter, summary)
       local indent = ""
       if #parents > 1 then indent = string.rep("  ", #parents - 1) .. " " end
 
-      item.text = string.format(" %s %s%-10s\t %s", item.kind, indent, item.node_text, item.full_text)
+      item.text = string.format(" %s %s%-10s\t %s", item.kind, indent, item.node_text,
+                                item.full_text)
       if #item.text > length then length = #item.text end
       table.insert(all_nodes, item)
       ::continue::
     end
   end
+  verbose(all_nodes)
   return all_nodes, length
 end
 
-function M.buf_func()
-  if ts_locals == nil then
+function M.buf_func(bufnr)
+  if not ok or ts_locals == nil then
     error("treesitter not loaded")
     return
   end
 
-  local bufnr = api.nvim_get_current_buf()
-  local all_nodes, width = get_all_nodes(bufnr, {["function"] = true, ["method"] = true}, true)
-  -- log(all_nodes, width)
+  bufnr = bufnr or api.nvim_get_current_buf()
+  local all_nodes, width = get_all_nodes(bufnr, {
+    ["function"] = true,
+    ["var"] = true,
+    ["method"] = true,
+    ["class"] = true,
+    ["type"] = true
+  }, true)
+  table.sort(all_nodes, function(i, j)
+    if i.range and j.range then
+      if i.range.start.line == j.range.start.line then
+        return i.range['end'].line < j.range['end'].line
+      else
+        return i.range.start.line < j.range.start.line
+      end
+    end
+    return false
+  end)
+
+  verbose(all_nodes, width)
+
   return all_nodes
 
 end
@@ -212,7 +271,14 @@ function M.buf_ts()
   local all_nodes, width = get_all_nodes(bufnr)
 
   local ft = vim.api.nvim_buf_get_option(bufnr, "ft")
-  gui.new_list_view({items = all_nodes, prompt = true, ft = ft, rawdata = true, width = width + 10, api = "🎄"})
+  gui.new_list_view({
+    items = all_nodes,
+    prompt = true,
+    ft = ft,
+    rawdata = true,
+    width = width + 10,
+    api = "🎄"
+  })
 end
 
 function M.bufs_ts()
@@ -239,7 +305,13 @@ function M.bufs_ts()
     verbose(ts_opened)
 
     local ft = vim.api.nvim_buf_get_option(0, "ft")
-    gui.new_list_view({items = ts_opened, prompt = true, ft = ft, width = max_length + 10, api = "🎄"})
+    gui.new_list_view({
+      items = ts_opened,
+      prompt = true,
+      ft = ft,
+      width = max_length + 10,
+      api = "🎄"
+    })
   end
 end
 
diff --git a/lua/navigator/util.lua b/lua/navigator/util.lua
index 1abff5c..824fca4 100644
--- a/lua/navigator/util.lua
+++ b/lua/navigator/util.lua
@@ -1,10 +1,7 @@
 -- retreives data form file
 -- and line to highlight
 -- Some of function copied from https://github.com/RishabhRD/nvim-lsputils
-
-local M = {
-  log_path = vim.lsp.get_log_path()
-}
+local M = {log_path = vim.lsp.get_log_path()}
 function M.get_data_from_file(filename, startLine)
   local displayLine
   if startLine < 3 then
@@ -28,10 +25,7 @@ function M.get_data_from_file(filename, startLine)
       startLine = startLine + 1
     end
   end
-  return {
-    data = data,
-    line = displayLine
-  }
+  return {data = data, line = displayLine}
 end
 
 function M.get_base(path)
@@ -47,9 +41,7 @@ end
 local function getDir(path)
   local data = {}
   local len = #path
-  if len <= 1 then
-    return nil
-  end
+  if len <= 1 then return nil end
   local last_index = 1
   for i = 2, len do
     local cur_char = path:sub(i, i)
@@ -68,35 +60,22 @@ function M.get_relative_path(base_path, my_path)
   local base_len = #base_data
   local my_len = #my_data
 
-  if base_len > my_len then
-    return my_path
-  end
+  if base_len > my_len then return my_path end
 
-  if base_data[1] ~= my_data[1] then
-    return my_path
-  end
+  if base_data[1] ~= my_data[1] then return my_path end
 
   local cur = 0
   for i = 1, base_len do
-    if base_data[i] ~= my_data[i] then
-      break
-    end
+    if base_data[i] ~= my_data[i] then break end
     cur = i
   end
   local data = ""
-  for i = cur + 1, my_len do
-    data = data .. my_data[i] .. "/"
-  end
+  for i = cur + 1, my_len do data = data .. my_data[i] .. "/" end
   data = data .. M.get_base(my_path)
   return data
 end
 
-local default_config = {
-  plugin = "navigator",
-  use_console = false,
-  use_file = true,
-  level = "debug"
-}
+local default_config = {plugin = "navigator", use_console = false, use_file = true, level = "error"}
 
 M._log = require("guihua.log").new({level = default_config.level}, true)
 
@@ -104,24 +83,16 @@ M._log = require("guihua.log").new({level = default_config.level}, true)
 M.log = M._log.info
 M.verbose = M._log.debug
 
-function M.fmt(...)
-  M._log.fmt_info(...)
-end
+function M.fmt(...) M._log.fmt_info(...) end
 
 function M.split(inputstr, sep)
-  if sep == nil then
-    sep = "%s"
-  end
+  if sep == nil then sep = "%s" end
   local t = {}
-  for str in string.gmatch(inputstr, "([^" .. sep .. "]+)") do
-    table.insert(t, str)
-  end
+  for str in string.gmatch(inputstr, "([^" .. sep .. "]+)") do table.insert(t, str) end
   return t
 end
 
-function M.trim_space(s)
-  return s:match("^%s*(.-)%s*$")
-end
+function M.trim_space(s) return s:match("^%s*(.-)%s*$") end
 
 function M.quickfix_extract(line)
   -- check if it is a line of file pos been selected
@@ -137,7 +108,10 @@ function M.quickfix_extract(line)
     M.log(line)
     return nil
   end
-  local location = {uri = "file:///" .. sep[1], range = {start = {line = sep[2] - 3 > 0 and sep[2] - 3 or 1}}}
+  local location = {
+    uri = "file:///" .. sep[1],
+    range = {start = {line = sep[2] - 3 > 0 and sep[2] - 3 or 1}}
+  }
   location.range["end"] = {line = sep[2] + 15}
   return location
 end
@@ -156,9 +130,7 @@ function M.getArgs(inputstr)
   return cmd, t
 end
 
-function M.p(t)
-  print(vim.inspect(t))
-end
+function M.p(t) print(vim.inspect(t)) end
 
 function M.printError(msg)
   vim.cmd("echohl ErrorMsg")
@@ -176,18 +148,14 @@ function M.open_log()
   vim.cmd("edit " .. path)
 end
 
-function table.pack(...)
-  return {n = select("#", ...), ...}
-end
+function table.pack(...) return {n = select("#", ...), ...} end
 
 function M.show(...)
   local string = ""
 
   local args = table.pack(...)
 
-  for i = 1, args.n do
-    string = string .. tostring(args[i]) .. "\t"
-  end
+  for i = 1, args.n do string = string .. tostring(args[i]) .. "\t" end
 
   return string .. "\n"
 end
@@ -197,48 +165,26 @@ function M.split2(s, sep)
 
   sep = sep or " "
   local pattern = string.format("([^%s]+)", sep)
-  string.gsub(
-    s,
-    pattern,
-    function(c)
-      fields[#fields + 1] = c
-    end
-  )
+  string.gsub(s, pattern, function(c) fields[#fields + 1] = c end)
 
   return fields
 end
 
-M.open_file = function(filename)
-  vim.api.nvim_command(string.format("e! %s", filename))
-end
+M.open_file = function(filename) vim.api.nvim_command(string.format("e! %s", filename)) end
 
 M.open_file_at = function(filename, line, col)
   vim.api.nvim_command(string.format("e! +%s %s", line, filename))
   col = col or 1
-  vim.api.nvim_command(string.format("normal! %dl", col-1))
+  vim.api.nvim_command(string.format("normal! %dl", col - 1))
 end
 
-function M.exists(var)
-  for k, _ in pairs(_G) do
-    if k == var then
-      return true
-    end
-  end
-end
+function M.exists(var) for k, _ in pairs(_G) do if k == var then return true end end end
 
-function M.partial(func, arg)
-  return (function(...)
-    return func(arg, ...)
-  end)
-end
+function M.partial(func, arg) return (function(...) return func(arg, ...) end) end
 
 local exclude_ft = {"scrollbar", "help", "NvimTree"}
 function M.exclude(fname)
-  for i = 1, #exclude_ft do
-    if string.find(fname, exclude_ft[i]) then
-      return true
-    end
-  end
+  for i = 1, #exclude_ft do if string.find(fname, exclude_ft[i]) then return true end end
   return false
 end
 
@@ -250,33 +196,28 @@ local api = vim.api
 local bufs
 
 function M.set_virt_eol(bufnr, lnum, chunks, priority, id)
-  if nss == nil then
-    nss = api.nvim_create_namespace("navigator_search")
-  end
+  if nss == nil then nss = api.nvim_create_namespace("navigator_search") end
   bufnr = bufnr == 0 and api.nvim_get_current_buf() or bufnr
   bufs[bufnr] = true
   -- id may be nil
-  return api.nvim_buf_set_extmark(bufnr, nss, lnum, -1, {id = id, virt_text = chunks, priority = priority})
+  return api.nvim_buf_set_extmark(bufnr, nss, lnum, -1,
+                                  {id = id, virt_text = chunks, priority = priority})
 end
 
 function M.clear_buf(bufnr)
-  if not bufnr then
-    return
-  end
+  if not bufnr then return end
   bufnr = bufnr == 0 and api.nvim_get_current_buf() or bufnr
   if bufs[bufnr] then
     if api.nvim_buf_is_valid(bufnr) then
       api.nvim_buf_clear_namespace(bufnr, nss, 0, -1)
-    -- nvim_buf_del_extmark
+      -- nvim_buf_del_extmark
     end
     bufs[bufnr] = nil
   end
 end
 
 function M.clear_all_buf()
-  for bufnr in pairs(bufs) do
-    M.clear_buf(bufnr)
-  end
+  for bufnr in pairs(bufs) do M.clear_buf(bufnr) end
   bufs = {}
 end