Add setup.py

[JakobDev]

This PR tries to create a Whell for Python. It should close #364. The code was copied from StackOverflow.

What does work?
I created a small demo program to test:

from PyQt5.QtWidgets import QApplication
from QTermWidget import QTermWidget
import sys


if __name__ == "__main__":
    app = QApplication(sys.argv)
    term = QTermWidget()
    term.show()
    sys.exit(app.exec())

I used the follwing enviroment:
A VM wwith Arch Linux. All needed packages to build are installed. PyQt5 is installed with Pacman. QTermWidget is not installed.

How to build:

python setup.py bdist_wheel
pip install ./dist/*.whl

The demo program above worked.

What does not work?
The package dosen't contain data files such as the color-schemes. I needed to figure out how to copy them from the lib folder into the package and QTermWidget needs to recognize they on this place.

Building from a source package does also not work.

python setup.py bdist_wheel
pip install ./dist/QTermWidget-0.1.tar.gz

The build and instalation have no problems. But when I try to run I get the following error:

ImportError: libqtermwidget5.so.0: cannot open shared object file: No such file or directory

libqtermwidget5.so.0 is in the same folder as the rest. It has the same files like the wheel, so I don't know what's the problem here.

What was not tested?
I don't know if the Binaries are working on other systems than mine. We may have to take a look at manylinux.

[JakobDev]

The data files are now included. QTermWidget need now to be patched to find them, but that is out of my scope.

I noticed that I can fix ImportError from the source build by adding the directory with the package to LD_LIBRARY_PATH. I don't know why this is only needed when using a source package. Maybe someone who knows more about C++ and building can take a look at that.

[yan12125]

FWIW, I'm working on moving the PyQt builder from SIP 4.x to the latest SIP (6.x) on branch https://github.com/lxqt/qtermwidget/tree/sip5. One of major changes in newer SIP is that it builds wheels out-of-box.

[yan12125]

I believe this is not necessary anymore after the SIP 5.x support (#465) is merged. Feel free to propose improvements for newly-added files ;)