WINDOWS: Check for python before creating the search engine tab. Prevents the creation of python specific files in the user's PC if no python is found. Closes #1370.

src/mainwindow.cpp

@@ -85,6 +85,9 @@ void qt_mac_set_dock_menu(QMenu *menu);
 #include "programupdater.h"
 #endif
 #include "powermanagement.h"
+#ifdef Q_OS_WIN
+#include "downloadthread.h"
+#endif
 
 using namespace libtorrent;
 
@@ -98,7 +101,11 @@ using namespace libtorrent;
  *****************************************************/
 
 // Constructor
-MainWindow::MainWindow(QWidget *parent, const QStringList& torrentCmdLine) : QMainWindow(parent), m_posInitialized(false), force_exit(false) {
+MainWindow::MainWindow(QWidget *parent, const QStringList& torrentCmdLine) : QMainWindow(parent), m_posInitialized(false), force_exit(false)
+#ifdef Q_OS_WIN
+, has_python(false)
+#endif
+{
   setupUi(this);
 
   Preferences* const pref = Preferences::instance();
@@ -249,9 +256,10 @@ MainWindow::MainWindow(QWidget *parent, const QStringList& torrentCmdLine) : QMa
   actionRSS_Reader->setChecked(pref->isRSSEnabled());
   actionSearch_engine->setChecked(pref->isSearchEnabled());
   actionExecution_Logs->setChecked(pref->isExecutionLogEnabled());
-  displaySearchTab(actionSearch_engine->isChecked());
   displayRSSTab(actionRSS_Reader->isChecked());
   on_actionExecution_Logs_triggered(actionExecution_Logs->isChecked());
+  if (actionSearch_engine->isChecked())
+    QTimer::singleShot(0, this, SLOT(on_actionSearch_engine_triggered()));
 
   // Auto shutdown actions
   QActionGroup * autoShutdownGroup = new QActionGroup(this);
@@ -1317,7 +1325,27 @@ void MainWindow::on_actionRSS_Reader_triggered() {
 }
 
 void MainWindow::on_actionSearch_engine_triggered() {
-  Preferences::instance()->setSearchEnabled(actionSearch_engine->isChecked());
+#ifdef Q_OS_WIN
+  if (!has_python && actionSearch_engine->isChecked()) {
+    bool res = addPythonPathToEnv();
+    if (res)
+      has_python = true;
+    else if (QMessageBox::question(this, tr("Missing Python Interpreter"),
+                                   tr("Python 2.x is required to use the search engine but it does not seem to be installed.\nDo you want to install it now?"),
+                                   QMessageBox::Yes|QMessageBox::No, QMessageBox::Yes) == QMessageBox::Yes) {
+      // Download and Install Python
+      installPython();
+      actionSearch_engine->setChecked(false);
+      Preferences::instance()->setSearchEnabled(false);
+      return;
+    }
+    else {
+      actionSearch_engine->setChecked(false);
+      Preferences::instance()->setSearchEnabled(false);
+      return;
+    }
+  }
+#endif
   displaySearchTab(actionSearch_engine->isChecked());
 }
 
@@ -1467,3 +1495,65 @@ void MainWindow::checkProgramUpdate() {
   updater->checkForUpdates();
 }
 #endif
+
+#ifdef Q_OS_WIN
+bool MainWindow::addPythonPathToEnv() {
+  if (has_python)
+    return true;
+  QString python_path = Preferences::getPythonPath();
+  if (!python_path.isEmpty()) {
+    // Add it to PATH envvar
+    QString path_envar = QString::fromLocal8Bit(qgetenv("PATH").constData());
+    if (path_envar.isNull()) {
+      path_envar = "";
+    }
+    path_envar = python_path+";"+path_envar;
+    qDebug("New PATH envvar is: %s", qPrintable(path_envar));
+    qputenv("PATH", fsutils::toNativePath(path_envar).toLocal8Bit());
+    return true;
+  }
+  return false;
+}
+
+void MainWindow::installPython() {
+  setCursor(QCursor(Qt::WaitCursor));
+  // Download python
+  DownloadThread *pydownloader = new DownloadThread(this);
+  connect(pydownloader, SIGNAL(downloadFinished(QString,QString)), this, SLOT(pythonDownloadSuccess(QString,QString)));
+  connect(pydownloader, SIGNAL(downloadFailure(QString,QString)), this, SLOT(pythonDownloadFailure(QString,QString)));
+  pydownloader->downloadUrl("http://python.org/ftp/python/2.7.3/python-2.7.3.msi");
+}
+
+void MainWindow::pythonDownloadSuccess(QString url, QString file_path) {
+  setCursor(QCursor(Qt::ArrowCursor));
+  Q_UNUSED(url);
+  QFile::rename(file_path, file_path+".msi");
+  QProcess installer;
+  qDebug("Launching Python installer in passive mode...");
+
+  installer.start("msiexec.exe /passive /i " + fsutils::toNativePath(file_path) + ".msi");
+  // Wait for setup to complete
+  installer.waitForFinished();
+
+  qDebug("Installer stdout: %s", installer.readAllStandardOutput().data());
+  qDebug("Installer stderr: %s", installer.readAllStandardError().data());
+  qDebug("Setup should be complete!");
+  // Delete temp file
+  fsutils::forceRemove(file_path);
+  // Reload search engine
+  has_python = addPythonPathToEnv();
+  if (has_python) {
+    actionSearch_engine->setChecked(true);
+    Preferences::instance()->setSearchEnabled(true);
+    displaySearchTab(true);
+  }
+  sender()->deleteLater();
+}
+
+void MainWindow::pythonDownloadFailure(QString url, QString error) {
+  Q_UNUSED(url);
+  setCursor(QCursor(Qt::ArrowCursor));
+  QMessageBox::warning(this, tr("Download error"), tr("Python setup could not be downloaded, reason: %1.\nPlease install it manually.").arg(error));
+  sender()->deleteLater();
+}
+#endif

src/mainwindow.h

@@ -152,6 +152,12 @@ protected:
 
 private:
   QIcon getSystrayIcon() const;
+#ifdef Q_OS_WIN
+  bool addPythonPathToEnv();
+  void installPython();
+  void pythonDownloadSuccess(QString url, QString file_path);
+  void pythonDownloadFailure(QString url, QString error);
+#endif
 
 private:
   QFileSystemWatcher *executable_watcher;
@@ -200,6 +206,9 @@ private:
 #if defined(Q_OS_WIN) || defined(Q_OS_MAC)
   QTimer programUpdateTimer;
 #endif
+#ifdef Q_OS_WIN
+  bool has_python;
+#endif
 
 private slots:
     void on_actionSearch_engine_triggered();

src/searchengine/searchengine.cpp

@@ -49,7 +49,6 @@
 
 #include "searchengine.h"
 #include "qbtsession.h"
-#include "downloadthread.h"
 #include "fs_utils.h"
 #include "misc.h"
 #include "preferences.h"
@@ -79,9 +78,6 @@ SearchEngine::SearchEngine(MainWindow* parent)
   // Boolean initialization
   search_stopped = false;
   // Creating Search Process
-#ifdef Q_OS_WIN
-  has_python = addPythonPathToEnv();
-#endif
   searchProcess = new QProcess(this);
   searchProcess->setEnvironment(QProcess::systemEnvironment());
   connect(searchProcess, SIGNAL(started()), this, SLOT(searchStarted()));
@@ -93,11 +89,7 @@ SearchEngine::SearchEngine(MainWindow* parent)
   connect(searchTimeout, SIGNAL(timeout()), this, SLOT(on_search_button_clicked()));
   // Update nova.py search plugin if necessary
   updateNova();
-  supported_engines = new SupportedEngines(
-      #ifdef Q_OS_WIN
-        has_python
-      #endif
-        );
+  supported_engines = new SupportedEngines();
   // Fill in category combobox
   fillCatCombobox();
 
@@ -114,65 +106,6 @@ void SearchEngine::fillCatCombobox() {
   }
 }
 
-#ifdef Q_OS_WIN
-bool SearchEngine::addPythonPathToEnv() {
-  QString python_path = Preferences::getPythonPath();
-  if (!python_path.isEmpty()) {
-    // Add it to PATH envvar
-    QString path_envar = QString::fromLocal8Bit(qgetenv("PATH").constData());
-    if (path_envar.isNull()) {
-      path_envar = "";
-    }
-    path_envar = python_path+";"+path_envar;
-    qDebug("New PATH envvar is: %s", qPrintable(path_envar));
-    qputenv("PATH", fsutils::toNativePath(path_envar).toLocal8Bit());
-    return true;
-  }
-  return false;
-}
-
-void SearchEngine::installPython() {
-  setCursor(QCursor(Qt::WaitCursor));
-  // Download python
-  DownloadThread *pydownloader = new DownloadThread(this);
-  connect(pydownloader, SIGNAL(downloadFinished(QString,QString)), this, SLOT(pythonDownloadSuccess(QString,QString)));
-  connect(pydownloader, SIGNAL(downloadFailure(QString,QString)), this, SLOT(pythonDownloadFailure(QString,QString)));
-  pydownloader->downloadUrl("http://python.org/ftp/python/2.7.3/python-2.7.3.msi");
-}
-
-void SearchEngine::pythonDownloadSuccess(QString url, QString file_path) {
-  setCursor(QCursor(Qt::ArrowCursor));
-  Q_UNUSED(url);
-  QFile::rename(file_path, file_path+".msi");
-  QProcess installer;
-  qDebug("Launching Python installer in passive mode...");
-
-  installer.start("msiexec.exe /passive /i " + fsutils::toNativePath(file_path) + ".msi");
-  // Wait for setup to complete
-  installer.waitForFinished();
-
-  qDebug("Installer stdout: %s", installer.readAllStandardOutput().data());
-  qDebug("Installer stderr: %s", installer.readAllStandardError().data());
-  qDebug("Setup should be complete!");
-  // Reload search engine
-  has_python = addPythonPathToEnv();
-  if (has_python) {
-    supported_engines->update();
-    // Launch the search again
-    on_search_button_clicked();
-  }
-  // Delete temp file
-  fsutils::forceRemove(file_path);
-}
-
-void SearchEngine::pythonDownloadFailure(QString url, QString error) {
-  Q_UNUSED(url);
-  setCursor(QCursor(Qt::ArrowCursor));
-  QMessageBox::warning(this, tr("Download error"), tr("Python setup could not be downloaded, reason: %1.\nPlease install it manually.").arg(error));
-}
-
-#endif
-
 QString SearchEngine::selectedCategory() const {
   return comboCategory->itemData(comboCategory->currentIndex()).toString();
 }
@@ -226,17 +159,6 @@ void SearchEngine::giveFocusToSearchInput() {
 
 // Function called when we click on search button
 void SearchEngine::on_search_button_clicked() {
-#ifdef Q_OS_WIN
-  if (!has_python) {
-    if (QMessageBox::question(this, tr("Missing Python Interpreter"),
-                             tr("Python 2.x is required to use the search engine but it does not seem to be installed.\nDo you want to install it now?"),
-                             QMessageBox::Yes|QMessageBox::No, QMessageBox::Yes) == QMessageBox::Yes) {
-      // Download and Install Python
-      installPython();
-    }
-    return;
-  }
-#endif
   if (searchProcess->state() != QProcess::NotRunning) {
 #ifdef Q_OS_WIN
     searchProcess->kill();

src/searchengine/searchengine.h

@@ -41,7 +41,6 @@
 #include "searchtab.h"
 #include "supportedengines.h"
 
-class DownloadThread;
 class SearchEngine;
 class MainWindow;
 class LineEdit;
@@ -105,12 +104,6 @@ protected slots:
   void downloadFinished(int exitcode, QProcess::ExitStatus);
   void fillCatCombobox();
   void searchTextEdited(QString);
-#ifdef Q_OS_WIN
-  bool addPythonPathToEnv();
-  void installPython();
-  void pythonDownloadSuccess(QString url, QString file_path);
-  void pythonDownloadFailure(QString url, QString error);
-#endif
 
 private slots:
   void on_goToDescBtn_clicked();
@@ -130,9 +123,6 @@ private:
   QList<QPointer<SearchTab> > all_tab; // To store all tabs
   const SearchCategories full_cat_names;
   MainWindow *mp_mainWindow;
-#ifdef Q_OS_WIN
-  bool has_python;
-#endif
 };
 
 #endif

src/searchengine/supportedengines.h

@@ -105,9 +105,8 @@ signals:
   void newSupportedEngine(QString name);
 
 public:
-  SupportedEngines(bool has_python = true) {
-    if (has_python)
-      update();
+  SupportedEngines() {
+    update();
   }
 
   ~SupportedEngines() {