Option to show console when external program is run

Windows only.
Closes #9592

src/app/application.cpp

@@ -345,8 +345,34 @@ void Application::runExternalProgram(const BitTorrent::TorrentHandle *torrent) c
     for (int i = 1; i < argCount; ++i)
         argList += QString::fromWCharArray(args[i]);
 
-    QProcess::startDetached(QString::fromWCharArray(args[0]), argList);
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+    QProcess proc;
+    proc.setProgram(QString::fromWCharArray(args[0]));
+    proc.setArguments(argList);
+    proc.setCreateProcessArgumentsModifier([](QProcess::CreateProcessArguments *args)
+    {
+        if (Preferences::instance()->isAutoRunConsoleEnabled()) {
+            args->flags |= CREATE_NEW_CONSOLE;
+            args->flags &= ~(CREATE_NO_WINDOW | DETACHED_PROCESS);
+        }
+        else {
+            args->flags |= CREATE_NO_WINDOW;
+            args->flags &= ~(CREATE_NEW_CONSOLE | DETACHED_PROCESS);
+        }
+        args->inheritHandles = false;
+        args->startupInfo->dwFlags &= ~STARTF_USESTDHANDLES;
+        ::CloseHandle(args->startupInfo->hStdInput);
+        ::CloseHandle(args->startupInfo->hStdOutput);
+        ::CloseHandle(args->startupInfo->hStdError);
+        args->startupInfo->hStdInput = nullptr;
+        args->startupInfo->hStdOutput = nullptr;
+        args->startupInfo->hStdError = nullptr;
+    });
+    proc.startDetached();
 #else
+    QProcess::startDetached(QString::fromWCharArray(args[0]), argList);
+#endif // QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
+#else // Q_OS_WIN
     // Cannot give users shell environment by default, as doing so could
     // enable command injection via torrent name and other arguments
     // (especially when some automated download mechanism has been setup).

src/base/preferences.cpp

@@ -804,6 +804,18 @@ void Preferences::setAutoRunProgram(const QString &program)
     setValue("AutoRun/program", program);
 }
 
+#if defined(Q_OS_WIN) && (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+bool Preferences::isAutoRunConsoleEnabled() const
+{
+    return value("AutoRun/ConsoleEnabled", false).toBool();
+}
+
+void Preferences::setAutoRunConsoleEnabled(const bool enabled)
+{
+    setValue("AutoRun/ConsoleEnabled", enabled);
+}
+#endif
+
 bool Preferences::shutdownWhenDownloadsComplete() const
 {
     return value("Preferences/Downloads/AutoShutDownOnCompletion", false).toBool();

src/base/preferences.h

@@ -238,6 +238,10 @@ public:
     void setAutoRunEnabled(bool enabled);
     QString getAutoRunProgram() const;
     void setAutoRunProgram(const QString &program);
+#if defined(Q_OS_WIN) && (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+    bool isAutoRunConsoleEnabled() const;
+    void setAutoRunConsoleEnabled(bool enabled);
+#endif
     bool shutdownWhenDownloadsComplete() const;
     void setShutdownWhenDownloadsComplete(bool shutdown);
     bool suspendWhenDownloadsComplete() const;

src/gui/optionsdialog.cpp

@@ -295,6 +295,7 @@ OptionsDialog::OptionsDialog(QWidget *parent)
     connect(m_ui->mailNotifPassword, &QLineEdit::textChanged, this, &ThisType::enableApplyButton);
     connect(m_ui->autoRunBox, &QGroupBox::toggled, this, &ThisType::enableApplyButton);
     connect(m_ui->lineEditAutoRun, &QLineEdit::textChanged, this, &ThisType::enableApplyButton);
+    connect(m_ui->autoRunConsole, &QCheckBox::toggled, this, &ThisType::enableApplyButton);
 
     const QString autoRunStr = QString("%1\n    %2\n    %3\n    %4\n    %5\n    %6\n    %7\n    %8\n    %9\n    %10\n    %11\n%12")
         .arg(tr("Supported parameters (case sensitive):")
@@ -696,6 +697,9 @@ void OptionsDialog::saveOptions()
     pref->setMailNotificationSMTPPassword(m_ui->mailNotifPassword->text());
     pref->setAutoRunEnabled(m_ui->autoRunBox->isChecked());
     pref->setAutoRunProgram(m_ui->lineEditAutoRun->text().trimmed());
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)) && defined(Q_OS_WIN)
+    pref->setAutoRunConsoleEnabled(m_ui->autoRunConsole->isChecked());
+#endif
     pref->setActionOnDblClOnTorrentDl(getActionOnDblClOnTorrentDl());
     pref->setActionOnDblClOnTorrentFn(getActionOnDblClOnTorrentFn());
     TorrentFileGuard::setAutoDeleteMode(!m_ui->deleteTorrentBox->isChecked() ? TorrentFileGuard::Never
@@ -970,6 +974,11 @@ void OptionsDialog::loadOptions()
 
     m_ui->autoRunBox->setChecked(pref->isAutoRunEnabled());
     m_ui->lineEditAutoRun->setText(pref->getAutoRunProgram());
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)) && defined(Q_OS_WIN)
+    m_ui->autoRunConsole->setChecked(pref->isAutoRunConsoleEnabled());
+#else
+    m_ui->autoRunConsole->hide();
+#endif
     intValue = pref->getActionOnDblClOnTorrentDl();
     if (intValue >= m_ui->actionTorrentDlOnDblClBox->count())
         intValue = 0;

src/gui/optionsdialog.ui

@@ -1264,6 +1264,13 @@
                <item>
                 <widget class="QLineEdit" name="lineEditAutoRun"/>
                </item>
+               <item>
+                <widget class="QCheckBox" name="autoRunConsole">
+                 <property name="text">
+                  <string>Show console window</string>
+                 </property>
+                </widget>
+               </item>
                <item>
                 <widget class="QLabel" name="labelAutoRunParam">
                  <property name="wordWrap">