Convert QObject subclasses to clementine wrapped python types properly when calling python functions

src/scripting/python/clementine.sip

@@ -28,3 +28,7 @@
 %Include songloader.sip
 %Include taskmanager.sip
 %Include uiinterface.sip
+
+// Remember: when adding a class that inherits from QObject, add it to the list
+// in scriptinterface.sip as well, or else it won't cast properly when calling
+// python slots.

src/scripting/python/playlistmanager.sip

@@ -21,7 +21,7 @@ public:
   LibraryBackend* library_backend() const;
   // PlaylistBackend* playlist_backend() const;
   PlaylistSequence* sequence() const;
-  // PlaylistParser* parser() const;
+  PlaylistParser* parser() const;
 
 public slots:
   void New(const QString& name, const SongList& songs = SongList());

src/scripting/python/scriptinterface.sip

@@ -4,6 +4,53 @@ class ScriptInterface : QObject {
 #include "scripting/scriptinterface.h"
 %End
 
+%ConvertToSubClassCode
+  // Any classes that inherit from QObject must be added to this list
+
+  #define CLASS(name) {sipName_##name, &sipType_##name}
+  static struct class_list {
+    const char *name;
+    sipTypeDef **type;
+  } list[] = {
+    CLASS(LibraryBackend),
+    CLASS(MergedProxyModel),
+    CLASS(NetworkAccessManager),
+    CLASS(ParserBase),
+    CLASS(Player),
+    CLASS(Playlist),
+    CLASS(PlaylistManager),
+    CLASS(PlaylistParser),
+    CLASS(PlaylistSequence),
+    CLASS(Queue),
+    CLASS(RadioModel),
+    CLASS(RadioService),
+    CLASS(ScriptInterface),
+    CLASS(SettingsDialog),
+    CLASS(SongLoader),
+    CLASS(TaskManager),
+    CLASS(UIInterface),
+    {0, 0}
+  };
+  #undef CLASS
+
+  sipType = NULL;
+
+  for (int i=0 ; ; ++i) {
+    struct class_list* p = &list[i];
+    if (!p->name) {
+      break;
+    }
+
+    if (sipCpp->inherits(p->name)) {
+      sipType = *p->type;
+      break;
+    }
+  }
+%End
+
+public:
+  void Abort();
+
 signals:
   void SettingsDialogRequested();
 

src/scripting/scriptinterface.cpp

@@ -27,6 +27,10 @@ ScriptInterface::ScriptInterface(Script* script, QObject* parent)
 {
 }
 
+void ScriptInterface::Abort() {
+  abort();
+}
+
 void ScriptInterface::ShowSettingsDialog() {
   emit SettingsDialogRequested();
 }

src/scripting/scriptinterface.h

@@ -31,6 +31,9 @@ class ScriptInterface : public QObject {
 public:
   ScriptInterface(Script* script, QObject* parent = 0);
 
+  // Gdb will break here
+  void Abort();
+
 public slots:
   // Callable by C++
   void ShowSettingsDialog();