Test reading debug.log

src/mainwindow.cpp

@@ -2115,11 +2115,51 @@ void MainWindow::rescanButtonClicked(int number) {
 
         // Call rescan RPC
         rpc->rescan(rescanHeight, [=] (QJsonValue response){
-            qDebug() << "rescanning " << response;
+            qDebug() << "rescanning finished" << response;
         });
 
-        /* TODO: Display progress somewhere by reading debug.log with QFileSystemWatcher
-         * or something similar / or use an available RPC and update rescan progress somewhere */
+        // TODO: Display progress somewhere by reading debug.log
+        #ifdef Q_OS_LINUX
+        auto debugLocation = QStandardPaths::locate(QStandardPaths::HomeLocation, ".hush/HUSH3/debug.log");
+        if(!QFile(debugLocation).exists()) {
+            // legacy location
+            debugLocation = QStandardPaths::locate(QStandardPaths::HomeLocation, ".komodo/HUSH3/debug.log");
+        }
+        #elif defined(Q_OS_DARWIN)
+        auto debugLocation = QStandardPaths::locate(QStandardPaths::HomeLocation, "Library/Application Support/Hush/HUSH3/debug.log");
+        if(!QFile(debugLocation).exists()) {
+            // legacy location
+            debugLocation = QStandardPaths::locate(QStandardPaths::HomeLocation, "Library/Application Support/Komodo/HUSH3/debug.log");
+        }
+        #else
+        auto debugLocation = QStandardPaths::locate(QStandardPaths::AppDataLocation, "../../Hush/HUSH3/debug.log");
+        if(!QFile(debugLocation).exists()) {
+            // legacy location
+            debugLocation = QStandardPaths::locate(QStandardPaths::AppDataLocation, "../../Komodo/HUSH3/debug.log");
+        }
+        #endif
+
+        if(QFile(debugLocation).exists()){
+            qDebug() << "Found debug.log at "+ debugLocation;
+            QFile debugLog(debugLocation);
+
+            if(debugLog.open(QIODevice::ReadOnly)){
+                debugLog.seek(debugLog.size()-1);
+                int count = 0;
+                int lines = 25;
+                while ( (count < lines) && (debugLog.pos() > 0) )
+                {
+                    QString ch = debugLog.read(1);
+                    debugLog.seek(debugLog.pos()-2);
+                    if (ch == "\n")
+                        count++;
+                }
+                qDebug() << "debug.log =" + debugLog.readAll();
+                debugLog.close();
+            }else{
+                qDebug() <<"couldn't open debug.log for reading";
+            }
+        }
     }
 }