Modified some APIs for more consistence

Correct null check after create_cutter_plugin()

Fix cutter.core()

src/Cutter.cpp

@@ -171,7 +171,7 @@ CutterCore::CutterCore(QObject *parent) :
 }
 
 
-CutterCore *CutterCore::getInstance()
+CutterCore *CutterCore::instance()
 {
     return uniqueInstance;
 }

src/Cutter.h

@@ -26,7 +26,7 @@
 
 #define APPNAME "Cutter"
 
-#define Core() (CutterCore::getInstance())
+#define Core() (CutterCore::instance())
 
 /*!
  * \brief Type to be used for all kinds of addresses/offsets in r2 address space.
@@ -416,7 +416,7 @@ class CutterCore: public QObject
 public:
     explicit CutterCore(QObject *parent = nullptr);
     ~CutterCore();
-    static CutterCore *getInstance();
+    static CutterCore *instance();
 
     AsyncTaskManager *getAsyncTaskManager() { return asyncTaskManager; }
 

src/MainWindow.cpp

@@ -389,6 +389,11 @@ void MainWindow::addPluginDockWidget(QDockWidget *dockWidget, QAction *action)
     updateDockActionChecked(action);
 }
 
+void MainWindow::addMenuFileAction(QAction *action)
+{
+    ui->menuFile->addAction(action);
+}
+
 void MainWindow::openNewFile(InitialOptions options, bool skipOptionsDialog)
 {
     setFilename(options.filename);
@@ -1162,3 +1167,18 @@ void MainWindow::addDockWidgetAction(QDockWidget *dockWidget, QAction *action)
 {
     this->dockWidgetActions[action] = dockWidget;
 }
+
+/*!
+ * \brief Show a warning message box.
+ *
+ * This API can either be used in Cutter internals, or by Python plugins.
+ */
+void MainWindow::messageBoxWarning(QString title, QString message)
+{
+    QMessageBox mb(this);
+    mb.setIcon(QMessageBox::Warning);
+    mb.setStandardButtons(QMessageBox::Ok);
+    mb.setWindowTitle(title);
+    mb.setText(message);
+    mb.exec();
+}

src/MainWindow.h

@@ -104,6 +104,7 @@ public:
     void addExtraWidget(QDockWidget *extraDock);
 
     void addPluginDockWidget(QDockWidget *dockWidget, QAction *action);
+    void addMenuFileAction(QAction *action);
 
     void updateDockActionChecked(QAction * action);
 
@@ -111,6 +112,7 @@ public:
     {
         return filename;
     }
+    void messageBoxWarning(QString title, QString message);
 
 public slots:
     void finalizeOpen();

src/common/PythonAPI.cpp

@@ -12,7 +12,7 @@ PyObject *api_version(PyObject *self, PyObject *null)
 {
     Q_UNUSED(self)
     Q_UNUSED(null)
-    return PyUnicode_FromString("Cutter version " CUTTER_VERSION_FULL);
+    return PyUnicode_FromString(CUTTER_VERSION_FULL);
 }
 
 PyObject *api_cmd(PyObject *self, PyObject *args)

src/plugins/PluginManager.cpp

@@ -126,7 +126,7 @@ CutterPlugin *PluginManager::loadPythonPlugin(const char *moduleName)
 
     PyObject *createPluginFunc = PyObject_GetAttrString(pluginModule, "create_cutter_plugin");
     if (!createPluginFunc || !PyCallable_Check(createPluginFunc)) {
-        qWarning() << "Plugin module does not contain create_plugin() function:" << QString(moduleName);
+        qWarning() << "Plugin module does not contain create_cutter_plugin() function:" << QString(moduleName);
         if (createPluginFunc) {
             Py_DECREF(createPluginFunc);
         }
@@ -137,14 +137,23 @@ CutterPlugin *PluginManager::loadPythonPlugin(const char *moduleName)
     PyObject *pluginObject = PyObject_CallFunction(createPluginFunc, nullptr);
     Py_DECREF(createPluginFunc);
     Py_DECREF(pluginModule);
+    if (!pluginObject) {
+        qWarning() << "Plugin's create_cutter_plugin() function failed.";
+        PyErr_Print();
+        return nullptr;
+    }
 
     PythonToCppFunc pythonToCpp = Shiboken::Conversions::isPythonToCppPointerConvertible(reinterpret_cast<SbkObjectType *>(SbkCutterBindingsTypes[SBK_CUTTERPLUGIN_IDX]), pluginObject);
     if (!pythonToCpp) {
-        qWarning() << "Plugin's create_plugin() function did not return an instance of CutterPlugin:" << QString(moduleName);
+        qWarning() << "Plugin's create_cutter_plugin() function did not return an instance of CutterPlugin:" << QString(moduleName);
         return nullptr;
     }
     CutterPlugin *plugin;
     pythonToCpp(pluginObject, &plugin);
+    if (!plugin) {
+        qWarning() << "Error during the setup of CutterPlugin:" << QString(moduleName);
+        return nullptr;
+    }
     return plugin;
 }
 #endif

src/python/cutter.py

@@ -9,4 +9,4 @@ def cmdj(command):
 
 
 def core():
-    return CutterCore.getInstance()
+    return CutterCore.instance()