catch and print exception string in ui on main screen creation

src/start_screen.cpp

@@ -13,6 +13,8 @@
 #include <memory>
 #include <filesystem>
 #include <fstream>
+#include <exception>
+#include <stdexcept>
 
 StartScreen::StartScreen(const std::vector<std::string_view>& args, SDL_Renderer* renderer, Theme& theme) : _renderer(renderer), _theme(theme) {
 	bool config_loaded {false};
@@ -301,9 +303,23 @@ Screen* StartScreen::render(float, bool&) {
 		}
 	} else {
 		if (ImGui::Button("proceed", {TEXT_PROCEED_WIDTH*1.5f, TEXT_BASE_HEIGHT*1.5f})) {
+			_error_string.clear();
 
-			auto new_screen = std::make_unique<MainScreen>(std::move(_conf), _renderer, _theme, _tox_profile_path, _password, _user_name, queued_plugin_paths);
-			return new_screen.release();
+			try {
+				auto new_screen = std::make_unique<MainScreen>(std::move(_conf), _renderer, _theme, _tox_profile_path, _password, _user_name, queued_plugin_paths);
+				if (!new_screen) {
+					throw std::runtime_error("failed to init main screen.");
+				}
+				return new_screen.release();
+			} catch (const std::exception& e) {
+				_error_string = std::string{"ToxCore/MainScreen creation failed with: "} + e.what();
+			} catch (...) {
+				_error_string = "ToxCore/MainScreen creation failed with unknown error";
+			}
+		}
+
+		if (!_error_string.empty()) {
+			ImGui::TextColored({1.f, 0.5f, 0.5f, 1.f}, "%s", _error_string.c_str());
 		}
 	}
 

src/start_screen.hpp

@@ -30,6 +30,8 @@ struct StartScreen final : public Screen {
 	std::string _tox_profile_path {"unnamed-tomato.tox"};
 	std::vector<std::string> queued_plugin_paths;
 
+	std::string _error_string;
+
 	StartScreen(void) = delete;
 	StartScreen(const std::vector<std::string_view>& args, SDL_Renderer* renderer, Theme& theme);
 	~StartScreen(void) = default;

src/tox_client.cpp

@@ -55,7 +55,7 @@ ToxClient::ToxClient(std::string_view save_path, std::string_view save_password)
 						profile_data.data(),
 						nullptr // TODO: error checking
 					)) {
-						throw std::runtime_error("FAILED to decrypt save file!!!!");
+						throw std::runtime_error("failed to decrypt save file!");
 					}
 					eee(_tox_profile_password);
 				}
@@ -69,12 +69,12 @@ ToxClient::ToxClient(std::string_view save_path, std::string_view save_password)
 
 	tox_options_set_experimental_groups_persistence(options, true);
 
-	TOX_ERR_NEW err_new;
+	Tox_Err_New err_new;
 	_tox = tox_new(options, &err_new);
 	tox_options_free(options);
 	if (err_new != TOX_ERR_NEW_OK) {
 		std::cerr << "tox_new failed with error code " << err_new << "\n";
-		throw std::runtime_error{"tox failed"};
+		throw std::runtime_error{std::string{"toxcore creation failed with '"} + tox_err_new_to_string(err_new) + "'"};
 	}
 
 	// no callbacks, use events