map incoming/outgoing calls handler

lua/navigator/lspclient/mapping.lua

@@ -283,10 +283,10 @@ function M.setup(user_opts)
 
   log('lsp cap:', cap.codeActionProvider)
 
-  -- if cap.call_hierarchy or cap.callHierarchyProvider then
-  --   vim.lsp.handlers['callHierarchy/incomingCalls'] = require('navigator.hierarchy').incoming_calls_handler
-  --   vim.lsp.handlers['callHierarchy/outgoingCalls'] = require('navigator.hierarchy').outgoing_calls_handler
-  -- end
+  if cap.call_hierarchy or cap.callHierarchyProvider then
+    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
   -- vim.lsp.handlers["textDocument/codeAction"] = require"navigator.codeAction".code_action_handler