diff --git a/README.md b/README.md
index dd3eec6..8ac84d0 100644
--- a/README.md
+++ b/README.md
@@ -90,7 +90,7 @@ in the same line). Using treesitter for file preview highlighter etc
 
 # Why a new plugin
 
-I'd like to go beyond what the system is providing.
+I'd like to go beyond what the system is offering.
 
 # Similar projects / special mentions:
 
diff --git a/lua/navigator.lua b/lua/navigator.lua
index 7ec9494..1bef8c3 100644
--- a/lua/navigator.lua
+++ b/lua/navigator.lua
@@ -1,10 +1,11 @@
 local M = {}
 _NgConfigValues = {
   debug = false, -- log output not implemented
-  width = 0.6, -- valeu of cols TODO allow float e.g. 0.6
-  preview_height = 0.35,
-  preview_lines = 40,
-  height = 0.35,
+  width = 0.62, -- valeu of cols
+  height = 0.38, -- listview height
+  preview_height = 0.38,
+  preview_lines = 40, -- total lines in preview screen
+  preview_lines_before = 5, -- lines before the highlight line
   default_mapping = true,
   keymaps = {}, -- e.g keymaps={{key = "GR", func = "references()"}, } this replace gr default mapping
 
@@ -119,7 +120,7 @@ M.setup = function(cfg)
   -- print("loading navigator")
   require('navigator.lazyloader')
   require('navigator.lspclient.clients').setup(_NgConfigValues)
-  require("navigator.lspclient.mapping").setup(_NgConfigValues)
+  -- require("navigator.lspclient.mapping").setup(_NgConfigValues)
   require("navigator.reference")
   require("navigator.definition")
   require("navigator.hierarchy")
diff --git a/lua/navigator/diagnostics.lua b/lua/navigator/diagnostics.lua
index b2edefc..74465d6 100644
--- a/lua/navigator/diagnostics.lua
+++ b/lua/navigator/diagnostics.lua
@@ -21,7 +21,7 @@ local function error_marker(result, client_id)
   local ft = vim.fn.expand('%:h:t') -- get the current file extension
 
   local bufnr = vim.uri_to_bufnr(result.uri)
-  if bufnr ~= vim.fn.bufnr() then
+  if bufnr ~= vim.api.nvim_get_current_buf() then
     -- log("not same buf", client_id, result.uri, bufnr, vim.fn.bufnr())
     return
   end
@@ -38,11 +38,20 @@ local function error_marker(result, client_id)
   end
 
   -- total line num of current buffer
-  local winid = vim.fn.win_getid(vim.fn.winnr())
-  local total_num = vim.fn.getbufinfo(vim.fn.winbufnr(winid))[1].linecount
+
+  -- local winid = vim.fn.win_getid(vim.fn.winnr())
+  -- local winid = vim.api.nvim_get_current_win()
+  bufnr = vim.api.nvim_get_current_buf()
+  local total_num = vim.fn.getbufinfo(bufnr)[1].linecount
+  -- local total_num = vim.fn.getbufinfo(vim.fn.winbufnr(winid))[1].linecount
   -- window size of current buffer
-  local wwidth = vim.fn.winwidth(winid)
-  local wheight = vim.fn.winheight(winid)
+
+  local stats = vim.api.nvim_list_uis()[1]
+  local wwidth = stats.width;
+  local wheight = stats.height;
+
+  -- local wwidth = vim.fn.winwidth(winid)
+  -- local wheight = vim.fn.winheight(winid)
   if total_num <= wheight then
     return
   end
diff --git a/lua/navigator/gui.lua b/lua/navigator/gui.lua
index 17453b6..13e6769 100644
--- a/lua/navigator/gui.lua
+++ b/lua/navigator/gui.lua
@@ -91,7 +91,9 @@ 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
+  if line_beg >= _NgConfigValues.preview_lines_before then
+    line_beg = line_beg - _NgConfigValues.preview_lines_before
+  elseif line_beg >= 2 then
     line_beg = line_beg - 2
   end
   local loc = {uri = opts.uri, range = {start = {line = line_beg}}}
diff --git a/lua/navigator/lru.lua b/lua/navigator/lru.lua
index 2e79a51..c335312 100644
--- a/lua/navigator/lru.lua
+++ b/lua/navigator/lru.lua
@@ -1,6 +1,32 @@
 -- lua-lru, LRU cache in Lua
 -- Copyright (c) 2015 Boris Nagaev
 -- See the LICENSE file for terms of use.
+--[[
+
+The MIT License (MIT)
+
+Copyright (c) 2015 Boris Nagaev
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+]]--
+
 local lru = {}
 
 function lru.new(max_size, max_bytes)
diff --git a/lua/navigator/lspclient/attach.lua b/lua/navigator/lspclient/attach.lua
index b055e29..39bd38a 100644
--- a/lua/navigator/lspclient/attach.lua
+++ b/lua/navigator/lspclient/attach.lua
@@ -50,8 +50,6 @@ M.on_attach = function(client, bufnr)
     config.lsp[client.name].on_attach(client, bufnr)
   end
 
-  require("navigator.lspclient.mapping").setup(_NgConfigValues)
-
 end
 
 -- M.setup = function(cfg)
diff --git a/lua/navigator/lspclient/clients.lua b/lua/navigator/lspclient/clients.lua
index d8b5217..3c7c074 100644
--- a/lua/navigator/lspclient/clients.lua
+++ b/lua/navigator/lspclient/clients.lua
@@ -313,6 +313,7 @@ end
 local function wait_lsp_startup(ft, retry, user_lsp_opts)
   retry = retry or false
   local clients = vim.lsp.get_active_clients() or {}
+
   local loaded = {}
   local capabilities = vim.lsp.protocol.make_client_capabilities()
   capabilities.textDocument.completion.completionItem.snippetSupport = true
diff --git a/lua/navigator/lspclient/mapping.lua b/lua/navigator/lspclient/mapping.lua
index 086ab4d..d8a4367 100644
--- a/lua/navigator/lspclient/mapping.lua
+++ b/lua/navigator/lspclient/mapping.lua
@@ -1,7 +1,5 @@
 local log = require"navigator.util".log
-local function set_keymap(...)
-  vim.api.nvim_set_keymap(...)
-end
+local trace = require"navigator.util".trace
 
 local event_hdlrs = {
   {ev = "BufWritePre", func = [[require "navigator.diagnostics".set_diag_loclist()]]},
@@ -42,11 +40,13 @@ local key_maps = {
   {key = "<C-LeftMouse>", func = "definition()"},
   {key = "g<LeftMouse>", func = "implementation()"},
   {key = "<Leader>k", func = "require('navigator.dochighlight').hi_symbol()"},
-  {key = '<Space>wa', func = 'vim.lsp.buf.add_workspace_folder()'},
-  {key = '<Space>wr', func = 'vim.lsp.buf.remove_workspace_folder()'},
+  {key = '<Space>wa', func = 'add_workspace_folder()'},
+  {key = '<Space>wr', func = 'remove_workspace_folder()'},
+  {key = 'ff', func = 'formatting()'},
+  {key = 'ff', func = 'range_formatting()', mode='v'},
   {key = '<Space>wl', func = 'print(vim.inspect(vim.lsp.buf.list_workspace_folders()))'},
-
   {key = "<Space>la", mode = "n", func = "require('navigator.codelens').run_action()"},
+
 }
 -- LuaFormatter on
 local M = {}
@@ -56,20 +56,51 @@ local ccls_mappings = {
   {key = "<Leader>go", func = "require('navigator.cclshierarchy').outgoing_calls()"}
 }
 
+local check_cap = function()
+  -- log(vim.lsp.buf_get_clients(0))
+  local rsv, fmt, rfmt, ccls
+  for _, value in pairs(vim.lsp.buf_get_clients(0)) do
+    if value == nil or value.resolved_capabilities == nil then
+      return
+    end
+    if value.resolved_capabilities.document_formatting then
+      fmt = true
+    end
+    if value.resolved_capabilities.document_range_formatting then
+      rfmt = true
+    end
+
+    -- log("override ccls", value.config)
+    if value.config.name == "ccls" then
+      ccls = true
+    end
+  end
+  return rsv, fmt, rfmt, ccls
+end
+
 local function set_mapping(user_opts)
   local opts = {noremap = true, silent = true}
   user_opts = user_opts or {}
 
-  local user_key = user_opts.keymaps or {}
+  local user_key = _NgConfigValues.keymaps or {}
   local bufnr = user_opts.bufnr or 0
 
-  local function buf_set_keymap(...)
-    vim.api.nvim_buf_set_keymap(bufnr, ...)
+  local function del_keymap(...)
+    vim.api.nvim_buf_del_keymap(bufnr, ...)
   end
 
+  local function set_keymap(...)
+    vim.api.nvim_buf_set_keymap(bufnr, ...)
+  end
   -- local function buf_set_option(...)
   --   vim.api.nvim_buf_set_option(bufnr, ...)
   -- end
+  local rsv, range_fmt, doc_fmt, ccls = check_cap()
+
+  if ccls then
+    vim.list_entend(key_maps, ccls_mappings)
+  end
+
   for _, v in pairs(user_key) do
     local exists = false
     for _, default in pairs(key_maps) do
@@ -82,9 +113,7 @@ local function set_mapping(user_opts)
       table.insert(key_maps, v)
     end
   end
-  -- log(key_maps)
-
-  -- local key_opts = {vim.tbl_deep_extend("force", key_maps, unpack(result))}
+  local fmtkey, rfmtkey
   for _, value in pairs(key_maps) do
     local f = "<Cmd>lua vim.lsp.buf." .. value.func .. "<CR>"
     if string.find(value.func, "require") then
@@ -96,57 +125,31 @@ local function set_mapping(user_opts)
     end
     local k = value.key
     local m = value.mode or "n"
-    -- log("binding", k, f)
-    set_keymap(m, k, f, opts)
-  end
-
-  -- format setup
-
-  local range_fmt = false
-  local doc_fmt = false
-  local ccls = false
-  -- log(vim.lsp.buf_get_clients(0))
-  for _, value in pairs(vim.lsp.buf_get_clients(0)) do
-    if value == nil or value.resolved_capabilities == nil then
-      return
-    end
-    if value.resolved_capabilities.document_formatting then
-      doc_fmt = true
-    end
-    if value.resolved_capabilities.document_range_formatting then
-      range_fmt = true
-    end
-
-    -- log("override ccls", value.config)
-    if value.config.name == "ccls" then
-
-      ccls = true
+    if string.find(value.func, "range_formatting") then
+      rfmtkey = value.key
+    elseif string.find(value.func, "formatting") then
+      fmtkey = value.key
     end
+    trace("binding", k, f)
+    set_keymap(m, k, f, opts)
   end
 
-  if ccls then
-    -- log("override ccls", ccls_mappings)
-    for _, value in pairs(ccls_mappings) do
-      local f = "<Cmd>lua " .. value.func .. "<CR>"
-      local k = value.key
-      local m = value.mode or "n"
-      set_keymap(m, k, f, opts)
-    end
-  end
   -- if user_opts.cap.document_formatting then
   if doc_fmt then
-    buf_set_keymap("n", "<space>ff", "<cmd>lua vim.lsp.buf.formatting()<CR>", opts)
     vim.cmd([[
       aug NavigatorAuFormat
         au!
         autocmd BufWritePre <buffer> lua vim.lsp.buf.formatting()
       aug END
      ]])
+  else
+    del_keymap('n', fmtkey)
   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)
+  if not range_fmt then
+    del_keymap("v", rfmtkey)
   end
+
   log("enable format ", doc_fmt, range_fmt)
 end
 
@@ -162,7 +165,7 @@ end
 local function set_event_handler(user_opts)
   user_opts = user_opts or {}
   local file_types =
-      "c,cpp,h,go,python,vim,sh,javascript,html,css,lua,typescript,rust,javascriptreact,typescriptreact,json,yaml,kotlin,php,dart,nim,terraform"
+      "c,cpp,h,go,python,vim,sh,javascript,html,css,lua,typescript,rust,javascriptreact,typescriptreact,json,yaml,kotlin,php,dart,nim,terraform,java"
   -- local format_files = "c,cpp,h,go,python,vim,javascript,typescript" --html,css,
   vim.api.nvim_command [[augroup nvim_lsp_autos]]
   vim.api.nvim_command [[autocmd!]]