Language server process is now started in root_uri path due to some servers require this it seems. Also added yet another hover result value retrieve method due to so many different result structures from different server implementations.

src/source_language_protocol.cc

@@ -14,7 +14,7 @@
 const bool output_messages_and_errors=false;
 
 LanguageProtocol::Client::Client(std::string root_uri_, std::string language_id_) : root_uri(std::move(root_uri_)), language_id(std::move(language_id_)) {
-  process = std::make_unique<TinyProcessLib::Process>(language_id+"-language-server", "",
+  process = std::make_unique<TinyProcessLib::Process>(language_id+"-language-server", root_uri,
                                                       [this](const char *bytes, size_t n) {
     server_message_stream.write(bytes, n);
     parse_server_message();
@@ -900,6 +900,7 @@ void Source::LanguageProtocolView::show_type_tooltips(const Gdk::Rectangle &rect
   auto offset=iter.get_offset();
   client->write_request("textDocument/hover", "\"textDocument\": {\"uri\":\"file://"+file_path.string()+"\"}, \"position\": {\"line\": "+std::to_string(iter.get_line())+", \"character\": "+std::to_string(iter.get_line_offset())+"}", [this, offset](const boost::property_tree::ptree &result, bool error) {
     if(!error) {
+      // hover result structure vary significantly from the different language servers
       std::string content;
       {
         auto contents_pt=result.get_child("contents", boost::property_tree::ptree());
@@ -911,6 +912,8 @@ void Source::LanguageProtocolView::show_type_tooltips(const Gdk::Rectangle &rect
         auto contents_it=result.find("contents");
         if(contents_it!=result.not_found())
           content=contents_it->second.get_value<std::string>("");
+        if(content.empty())
+          content=contents_it->second.get<std::string>("value", "");
       }
       if(!content.empty()) {
         dispatcher.post([this, offset, content=std::move(content)] {