jdtls, enable signature by default

lua/navigator.lua

@@ -20,6 +20,8 @@ _NgConfigValues = {
   code_lens_action_prompt = {enable = true, sign = true, sign_priority = 40, virtual_text = true},
   treesitter_analysis = true, -- treesitter variable context
   transparency = 50, -- 0 ~ 100 blur the main window, 100: fully transparent, 0: opaque,  set to nil to disable it
+  signature_help_cfg = nil, -- if you would like to init lsp_signature plugin in navigator, pass in signature help
+  -- setup here. if it is nil, navigator will not init signature help
   lsp = {
     format_on_save = true, -- set to false to disasble lsp code format on save (if you are using prettier/efm/formater etc)
     disable_format_ft = {}, -- a list of lsp not enable auto-format (e.g. if you using efm or vim-codeformat etc), empty by default

lua/navigator/lspclient/clients.lua

@@ -230,6 +230,11 @@ local setups = {
       clang = {excludeArgs = {"-frounding-math"}}
     },
     flags = {allow_incremental_sync = true}
+  },
+  jdtls = {
+    settings = {
+      java = {signatureHelp = {enabled = true}, contentProvider = {preferred = 'fernflower'}}
+    }
   }
 }
 
@@ -326,6 +331,7 @@ local function wait_lsp_startup(ft, retry, user_lsp_opts)
   capabilities.textDocument.completion.completionItem.resolveSupport = {
     properties = {'documentation', 'detail', 'additionalTextEdits'}
   }
+  capabilities.workspace.configuration = true
 
   for _, client in ipairs(clients) do
     if client ~= nil then
@@ -410,6 +416,11 @@ local function wait_lsp_startup(ft, retry, user_lsp_opts)
           end
         end
       end
+      cfg.on_init = function(client)
+        if client and client.config and client.config.settings then
+          client.notify('workspace/didChangeConfiguration', {settings = client.config.settings})
+        end
+      end
     end
 
     load_cfg(ft, lspclient, cfg, loaded)

lua/navigator/lspclient/mapping.lua

@@ -242,7 +242,11 @@ function M.setup(user_opts)
 
   -- TODO: when active signature merge to neovim, remove this setup:
   local hassig, sig = pcall(require, "lsp_signature")
-  if not hassig then
+  if hassig then
+    if _NgConfigValues.signature_help_cfg then
+      sig.setup(_NgConfigValues.signature_help_cfg)
+    end
+  else
     vim.lsp.handlers["textDocument/signatureHelp"] = vim.lsp.with(
                                                          require"navigator.signature".signature_handler,
                                                          {

lua/navigator/signature.lua

@@ -52,7 +52,14 @@ local signature_handler = mk_handler(function(err, result, ctx, config)
   if config == nil then
     log("config nil")
   end
-  config = config or nil
+  if err then
+    print("signature help error: ", err, vim.inspect(result), ctx, config)
+  end
+  config = config or {}
+  if config.border == nil then
+    config.border = _NgConfigValues.border
+  end
+
   if not (result and result.signatures and result.signatures[1]) then
     return
   end