SaveTool: launch the thread, and add basic response handling.

src/SaveTool/SaveTool.cpp

@@ -133,6 +133,11 @@ SaveTool::SaveTool(const Arguments& arguments):
     }
 
     initialiseConfiguration();
+
+    if(_checkUpdatesOnStartup) {
+        _thread = std::thread{[this]{ checkForUpdates(); }};
+        _queue.addToast(Toast::Type::Default, "Checking for updates...");
+    }
 }
 
 SaveTool::~SaveTool() {
@@ -286,7 +291,18 @@ void SaveTool::initEvent(SDL_Event& event) {
 void SaveTool::updateCheckEvent(SDL_Event& event) {
     _thread.join();
 
-    // TODO: implement
+    cpr::Response r{std::move(*static_cast<cpr::Response*>(event.user.data1))};
+    delete static_cast<cpr::Response*>(event.user.data1);
+
+    if(r.elapsed > 10.0) {
+        _queue.addToast(Toast::Type::Error, "The request timed out.");
+        return;
+    }
+
+    if(r.status_code != 200) {
+        _queue.addToast(Toast::Type::Error, Utility::formatString("The request failed with error code {}: {}", r.status_code, r.reason));
+        return;
+    }
 }
 
 void SaveTool::initialiseConfiguration() {

src/SaveTool/SaveTool_drawMainMenu.cpp

@@ -62,7 +62,10 @@ void SaveTool::drawMainMenu() {
 
                 ImGui::Checkbox("Check for updates on startup", &_checkUpdatesOnStartup);
                 ImGui::SameLine();
-                ImGui::Button(ICON_FA_SYNC_ALT " Check now");
+                if(ImGui::Button(ICON_FA_SYNC_ALT " Check now")) {
+                    _queue.addToast(Toast::Type::Default, "Checking for updates...");
+                    _thread = std::thread{[this]{ checkForUpdates(); }};
+                }
 
                 ImGui::EndMenu();
             }