diff --git a/lua/navigator/cclshierarchy.lua b/lua/navigator/cclshierarchy.lua
index a8b337d..1109f56 100644
--- a/lua/navigator/cclshierarchy.lua
+++ b/lua/navigator/cclshierarchy.lua
@@ -13,7 +13,7 @@ local function call_hierarchy_handler(direction, err, result, ctx, cfg, error_me
   log('call_hierarchy')
   log('call_hierarchy', direction, err, result, ctx, cfg)
 
-  assert(#vim.lsp.buf_get_clients() > 0, 'Must have a client running to use lsp_tags')
+  assert(next(vim.lsp.buf_get_clients()), 'Must have a client running to use lsp_tags')
   if err ~= nil then
     log('hierarchy error', ctx, 'dir', direction, 'result', result, 'err', err)
     vim.notify('ERROR: ' .. error_message, vim.lsp.log_levels.WARN)
@@ -52,7 +52,8 @@ 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, result, ctx, cfg)
-  assert(#vim.lsp.buf_get_clients() > 0, 'Must have a client running to use lsp_tags')
+  local bufnr = vim.api.nvim_get_current_buf()
+  assert(next(vim.lsp.buf_get_clients(bufnr)), 'Must have a client running to use lsp_tags')
 
   local results = call_hierarchy_handler_from(err, result, ctx, cfg, 'Incoming calls not found')
 
@@ -69,7 +70,8 @@ local function outgoing_calls_handler(bang, err, result, ctx, cfg)
 end
 
 function M.incoming_calls(bang, opts)
-  assert(#vim.lsp.buf_get_clients() > 0, 'Must have a client running to use lsp_tags')
+  local bufnr = vim.api.nvim_get_current_buf()
+  assert(next(vim.lsp.buf_get_clients(bufnr)), 'Must have a client running to use lsp_tags')
   -- if not lsphelper.check_capabilities("call_hierarchy") then
   --   return
   -- end
@@ -85,7 +87,8 @@ function M.incoming_calls(bang, opts)
 end
 
 function M.outgoing_calls(bang, opts)
-  assert(#vim.lsp.buf_get_clients() > 0, 'Must have a client running to use lsp_tags')
+  local bufnr = vim.api.nvim_get_current_buf()
+  assert(next(vim.lsp.buf_get_clients(bufnr)), 'Must have a client running to use lsp_tags')
   local params = vim.lsp.util.make_position_params()
   params['levels'] = 2
   params['callee'] = true
diff --git a/lua/navigator/codelens.lua b/lua/navigator/codelens.lua
index 49f6ebd..994f297 100644
--- a/lua/navigator/codelens.lua
+++ b/lua/navigator/codelens.lua
@@ -92,7 +92,7 @@ end
 M.lsp_clients = {}
 
 function M.refresh()
-  if #vim.lsp.buf_get_clients() < 1 then
+  if next(vim.lsp.buf_get_clients(0)) == nil then
     log('Must have a client running to use lsp code action')
     return
   end
@@ -130,7 +130,8 @@ M.inline = function()
   if vim.fn.getcmdwintype() == ':' then
     return
   end
-  if #vim.lsp.buf_get_clients() == 0 then
+
+  if next(vim.lsp.buf_get_clients(0)) == nil then
     return
   end
 
diff --git a/lua/navigator/definition.lua b/lua/navigator/definition.lua
index 87873d8..b491dd6 100644
--- a/lua/navigator/definition.lua
+++ b/lua/navigator/definition.lua
@@ -39,7 +39,7 @@ local function get_symbol()
 end
 
 local function def_preview(timeout_ms)
-  assert(#vim.lsp.buf_get_clients() > 0, 'Must have a client running')
+  assert(next(vim.lsp.buf_get_clients(0)), 'Must have a client running')
   local method = 'textDocument/definition'
   local params = vim.lsp.util.make_position_params()
   local result = vim.lsp.buf_request_sync(0, method, params, timeout_ms or 1000)
diff --git a/lua/navigator/diagnostics.lua b/lua/navigator/diagnostics.lua
index 13c2e35..a3f291b 100644
--- a/lua/navigator/diagnostics.lua
+++ b/lua/navigator/diagnostics.lua
@@ -385,14 +385,16 @@ M.set_diag_loclist = function()
     log('great, no errors!')
     return
   end
-  local clients = vim.lsp.buf_get_clients(0)
+
+  local bufnr = vim.api.nvim_get_current_buf()
+  local clients = vim.lsp.buf_get_clients(bufnr)
   local cfg = { open = diag_cnt > 0 }
   for _, client in pairs(clients) do
     cfg.client_id = client['id']
     break
   end
 
-  if not vim.tbl_isempty(vim.lsp.buf_get_clients(0)) then
+  if not vim.tbl_isempty(vim.lsp.buf_get_clients(bufnr)) then
     local err_cnt = get_count(0, [[Error]])
     if err_cnt > 0 and _NgConfigValues.lsp.disply_diagnostic_qf then
       if diagnostic.set_loclist then
diff --git a/lua/navigator/foldlsp.lua b/lua/navigator/foldlsp.lua
index b826046..43f3f6b 100644
--- a/lua/navigator/foldlsp.lua
+++ b/lua/navigator/foldlsp.lua
@@ -1,5 +1,5 @@
-local log = require"navigator.util".log
-local mk_handler = require"navigator.util".mk_handler
+local log = require('navigator.util').log
+local mk_handler = require('navigator.util').mk_handler
 
 local lsp = vim.lsp
 local api = vim.api
@@ -18,7 +18,7 @@ M.servers_supporting_folding = {
   texlab = true,
   clangd = false,
   gopls = true,
-  julials = false
+  julials = false,
 }
 
 M.active_folding_clients = {}
@@ -29,11 +29,11 @@ function M.on_attach()
 end
 
 function M.setup_plugin()
-  api.nvim_command("augroup FoldingCommand")
-  api.nvim_command("autocmd! * <buffer>")
+  api.nvim_command('augroup FoldingCommand')
+  api.nvim_command('autocmd! * <buffer>')
   api.nvim_command("autocmd BufEnter <buffer> lua require'navigator.foldlsp'.update_folds()")
   api.nvim_command("autocmd BufWritePost <buffer> lua require'navigator.foldlsp'.update_folds()")
-  api.nvim_command("augroup end")
+  api.nvim_command('augroup end')
 
   -- vim.cmd([[
   --
@@ -43,7 +43,7 @@ function M.setup_plugin()
   --
   --   ]])
 
-  local clients = vim.lsp.buf_get_clients()
+  local clients = vim.lsp.buf_get_clients(0)
 
   for _, client in pairs(clients) do
     local client_id = client['id']
@@ -73,9 +73,8 @@ function M.update_folds()
         -- XXX: better to pass callback in this method or add it directly in the config?
         -- client.config.callbacks['textDocument/foldingRange'] = M.fold_handler
         local current_bufnr = api.nvim_get_current_buf()
-        local params = {uri = vim.uri_from_bufnr(current_bufnr)}
-        client.request('textDocument/foldingRange', {textDocument = params}, M.fold_handler,
-                       current_bufnr)
+        local params = { uri = vim.uri_from_bufnr(current_bufnr) }
+        client.request('textDocument/foldingRange', { textDocument = params }, M.fold_handler, current_bufnr)
       end
     end
   end
@@ -93,7 +92,7 @@ M.fold_handler = mk_handler(function(err, result, ctx, config)
   -- params: err, method, result, client_id, bufnr
   -- XXX: handle err?
   if err or result == nil or #result == 0 then
-    vim.notify(string.format("%s %s ", tostring(err), vim.inspect(ctx)), vim.lsp.log_levels.WARN)
+    vim.notify(string.format('%s %s ', tostring(err), vim.inspect(ctx)), vim.lsp.log_levels.WARN)
     return
   end
   M.debug_folds()
@@ -160,13 +159,12 @@ function M.get_fold_indic(lnum)
     -- without any marker.
     return fold_level
   elseif is_foldstart then
-    return string.format(">%d", fold_level)
+    return string.format('>%d', fold_level)
   elseif is_foldend then
-    return string.format("<%d", fold_level)
+    return string.format('<%d', fold_level)
   else
     return fold_level
   end
-
 end
 
 return M
diff --git a/lua/navigator/hierarchy.lua b/lua/navigator/hierarchy.lua
index d71532a..36badd5 100644
--- a/lua/navigator/hierarchy.lua
+++ b/lua/navigator/hierarchy.lua
@@ -1,24 +1,26 @@
-local gui = require "navigator.gui"
-local util = require "navigator.util"
+local gui = require('navigator.gui')
+local util = require('navigator.util')
 local log = util.log
 local trace = util.trace
 local partial = util.partial
-local lsphelper = require "navigator.lspwrapper"
+local lsphelper = require('navigator.lspwrapper')
 
-local path_sep = require"navigator.util".path_sep()
-local path_cur = require"navigator.util".path_cur()
+local path_sep = require('navigator.util').path_sep()
+local path_cur = require('navigator.util').path_cur()
 local cwd = vim.loop.cwd()
 local M = {}
 local function call_hierarchy_handler(direction, err, result, ctx, cfg, error_message)
   if not result then
-    vim.notify ("No call hierarchy items found", vim.lsp.log_levels.WARN)
+    vim.notify('No call hierarchy items found', vim.lsp.log_levels.WARN)
     return
   end
   trace('call_hierarchy', result)
-  assert(#vim.lsp.buf_get_clients() > 0, "Must have a client running to use lsp_tags")
+
+  local bufnr = vim.api.nvim_get_current_buf()
+  assert(next(vim.lsp.buf_get_clients(bufnr)), 'Must have a client running to use lsp_tags')
   if err ~= nil then
-    log("dir", direction, "result", result, "err", err, ctx)
-    vim.notify("ERROR: " .. error_message, vim.lsp.log_levels.WARN)
+    log('dir', direction, 'result', result, 'err', err, ctx)
+    vim.notify('ERROR: ' .. error_message, vim.lsp.log_levels.WARN)
     return
   end
 
@@ -28,14 +30,14 @@ local function call_hierarchy_handler(direction, err, result, ctx, cfg, error_me
     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
     range = call_hierarchy_item.range or call_hierarchy_item.selectionRange
     local filename = assert(vim.uri_to_fname(call_hierarchy_item.uri))
     local display_filename = filename:gsub(cwd .. path_sep, path_cur, 1)
-    call_hierarchy_item.detail = call_hierarchy_item.detail or ""
-    call_hierarchy_item.detail = call_hierarchy_item.detail:gsub("\n", " ↳ ")
+    call_hierarchy_item.detail = call_hierarchy_item.detail or ''
+    call_hierarchy_item.detail = call_hierarchy_item.detail:gsub('\n', ' ↳ ')
     trace(range, call_hierarchy_item)
 
     local disp_item = {
@@ -45,7 +47,7 @@ local function call_hierarchy_handler(direction, err, result, ctx, cfg, error_me
       text = kind .. call_hierarchy_item.name .. ' ﰲ ' .. call_hierarchy_item.detail,
       range = range,
       lnum = range.start.line + 1,
-      col = range.start.character
+      col = range.start.character,
     }
 
     table.insert(items, disp_item)
@@ -54,43 +56,46 @@ local function call_hierarchy_handler(direction, err, result, ctx, cfg, error_me
   return items
 end
 
-local call_hierarchy_handler_from = partial(call_hierarchy_handler, "from")
-local call_hierarchy_handler_to = partial(call_hierarchy_handler, "to")
+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, result, ctx, cfg)
-  assert(#vim.lsp.buf_get_clients() > 0, "Must have a client running to use lsp hierarchy")
-  local results = call_hierarchy_handler_from(err, result, ctx, cfg, "Incoming calls not found")
+  local bufnr = vim.api.nvim_get_current_buf()
+  assert(next(vim.lsp.buf_get_clients(bufnr)), 'Must have a client running to use lsp hierarchy')
+  local results = call_hierarchy_handler_from(err, result, ctx, cfg, 'Incoming calls not found')
 
-  local ft = vim.api.nvim_buf_get_option(ctx.bufnr, "ft")
-  gui.new_list_view({items = results, ft = ft, api = ' '})
+  local ft = vim.api.nvim_buf_get_option(ctx.bufnr, 'ft')
+  gui.new_list_view({ items = results, ft = ft, api = ' ' })
 end
 
 local function outgoing_calls_handler(bang, err, result, ctx, cfg)
-  local results = call_hierarchy_handler_to(err, result, ctx, cfg, "Outgoing calls not found")
+  local results = call_hierarchy_handler_to(err, result, ctx, cfg, 'Outgoing calls not found')
 
-  local ft = vim.api.nvim_buf_get_option(ctx.bufnr, "ft")
-  gui.new_list_view({items = results, ft = ft, api = ' '})
+  local ft = vim.api.nvim_buf_get_option(ctx.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 hierarchy")
-  if not lsphelper.check_capabilities("call_hierarchy") then
+  local bufnr = vim.api.nvim_get_current_buf()
+  assert(next(vim.lsp.buf_get_clients(bufnr)), 'Must have a client running to use lsp hierarchy')
+  if not lsphelper.check_capabilities('call_hierarchy') then
     return
   end
 
   local params = vim.lsp.util.make_position_params()
-  lsphelper.call_sync("callHierarchy/incomingCalls", params, opts, partial(incoming_calls_handler, bang))
+  lsphelper.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
+  local bufnr = vim.api.nvim_get_current_buf()
+  assert(next(vim.lsp.buf_get_clients(bufnr)), '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()
-  lsphelper.call_sync("callHierarchy/outgoingCalls", params, opts, partial(outgoing_calls_handler, bang))
+  lsphelper.call_sync('callHierarchy/outgoingCalls', params, opts, partial(outgoing_calls_handler, bang))
 end
 
 M.incoming_calls_call = partial(M.incoming_calls, 0)