Core: do not override sys.stdin when using FreeCAD as Python module

src/Gui/PythonConsole.cpp

@@ -469,7 +469,13 @@ PythonConsole::PythonConsole(QWidget *parent)
     d->_stderrPy = new PythonStderr(this);
     d->_stdinPy  = new PythonStdin (this);
     d->_stdin  = PySys_GetObject("stdin");
-    PySys_SetObject("stdin", d->_stdinPy);
+
+    // Don't override stdin when running FreeCAD as Python module
+    auto& cfg = App::Application::Config();
+    auto overrideStdIn = cfg.find("DontOverrideStdIn");
+    if (overrideStdIn == cfg.end()) {
+        PySys_SetObject("stdin", d->_stdinPy);
+    }
 
     const char* version  = PyUnicode_AsUTF8(PySys_GetObject("version"));
     const char* platform = PyUnicode_AsUTF8(PySys_GetObject("platform"));

src/Gui/PythonConsolePy.cpp

@@ -296,6 +296,7 @@ void PythonStdin::init_type()
     behaviors().doc("Redirection of stdin to FreeCAD to open an input dialog");
     // you must have overwritten the virtual functions
     behaviors().supportRepr();
+    behaviors().supportGetattr();
     add_varargs_method("readline",&PythonStdin::readline,"readline()");
 }
 
@@ -316,6 +317,14 @@ Py::Object PythonStdin::repr()
     return Py::String(s_out.str());
 }
 
+Py::Object PythonStdin::getattr(const char *name)
+{
+    if (strcmp(name, "closed") == 0) {
+        return Py::Boolean(false);
+    }
+    return getattr_methods(name);
+}
+
 Py::Object PythonStdin::readline(const Py::Tuple& /*args*/)
 {
     return Py::String( (const char *)pyConsole->readline().toLatin1() );

src/Gui/PythonConsolePy.h

@@ -145,6 +145,7 @@ public:
     ~PythonStdin() override;
 
     Py::Object repr() override;
+    Py::Object getattr(const char *name) override;
     Py::Object readline(const Py::Tuple&);
 };
 

src/Main/FreeCADGuiPy.cpp

@@ -287,19 +287,23 @@ QWidget* setupMainWindow()
         }
 
         Base::PyGILStateLocker lock;
-        PyObject* input = PySys_GetObject("stdin");
+        // It's sufficient to create the config key
+        App::Application::Config()["DontOverrideStdIn"] = "";
         Gui::MainWindow *mw = new Gui::MainWindow();
         hasMainWindow = true;
 
         QIcon icon = qApp->windowIcon();
-        if (icon.isNull())
+        if (icon.isNull()) {
             qApp->setWindowIcon(Gui::BitmapFactory().pixmap(App::Application::Config()["AppIcon"].c_str()));
+        }
         mw->setWindowIcon(qApp->windowIcon());
         QString appName = qApp->applicationName();
-        if (!appName.isEmpty())
+        if (!appName.isEmpty()) {
             mw->setWindowTitle(appName);
-        else
+        }
+        else {
             mw->setWindowTitle(QString::fromLatin1(App::Application::Config()["ExeName"].c_str()));
+        }
 
         if (!SoDB::isInitialized()) {
             // init the Inventor subsystem
@@ -350,7 +354,6 @@ QWidget* setupMainWindow()
 
         Gui::Application::Instance->activateWorkbench(start.c_str());
         mw->loadWindowSettings();
-        PySys_SetObject("stdin", input);
     }
     else {
         Gui::getMainWindow()->show();