Show a warning about old docset storage (fixes #317)

src/ui/mainwindow.cpp

@@ -14,6 +14,7 @@
 #include <QAbstractEventDispatcher>
 #include <QCloseEvent>
 #include <QDesktopServices>
+#include <QFileInfo>
 #include <QKeyEvent>
 #include <QMenu>
 #include <QMessageBox>
@@ -319,6 +320,20 @@ MainWindow::MainWindow(Core::Application *app, QWidget *parent) :
     ui->treeView->setAttribute(Qt::WA_MacShowFocusRect, false);
     ui->sections->setAttribute(Qt::WA_MacShowFocusRect, false);
 #endif
+
+    /// TODO: Remove in the future releases
+    // Check pre-0.1 docset path
+    QString oldDocsetDir = QStandardPaths::writableLocation(QStandardPaths::DataLocation);
+    oldDocsetDir.remove(QStringLiteral("Zeal/Zeal"));
+    oldDocsetDir += QLatin1String("zeal/docsets");
+    if (QFileInfo::exists(oldDocsetDir) && m_settings->docsetPath != oldDocsetDir) {
+        QMessageBox::information(this, QStringLiteral("Zeal"),
+                                 QString(tr("Old docset storage has been found in <b>%1</b>. "
+                                            "You can move docsets to <b>%2</b> or change the docset storage path in the settings. <br><br>"
+                                            "Please note, that old docsets cannot be updated automatically, so it is better to download your docsets again. <br><br>"
+                                            "Remove or use the old docset storage to avoid this message in the future."))
+                                 .arg(oldDocsetDir, m_settings->docsetPath));
+    }
 }
 
 MainWindow::~MainWindow()