Even the best codebase can't effortless be ported. Calibre seems to have something around 25 MB of python-code, several external plugins, some C-code and other

Even the best codebase can't effortless be ported. Calibre seems to have something around 25 MB of python-code, several external plugins, some C-code and other languages. Transition of this would take quite some time. Additionally, there is the problem of compability. Configuration in Calibre is python-code, and on several corners the user can mod stuff. Any transition would need to make sure to not brake things to hard.