install.py

import sys
import os
import shutil

from pathlib import Path
from subprocess import call
from platform import system

def main(cont):
    
    # Sensors
    sensor = cont.sensors[0]
    
    if sensor.positive:
    
        # Other
        ext_exe = '.exe' if system() == 'Windows' else ''
        system_supported = system() in ['Windows', 'Linux']

        # Paths
        path_current = Path('.').resolve()
        path_bgcython = Path(Path(__file__).resolve().parent.as_posix() + '/bgcython').resolve()
        path_blender = Path(sys.executable).resolve()
        path_python = None
        path_sitepkg = None
        
        # Set remaining path variables, walking through blender files structure
        for _path, _folders, _files in os.walk(path_blender.parent.as_posix()):
            
            # python/bin folder
            if _path.endswith('bin'):
                for _file in _files:
                    
                    _p = Path(_path + '/' + _file).resolve()
                    
                    # Check if file is a python executable
                    if _file.startswith('python') and _file.endswith(ext_exe) and os.access(_p.as_posix(), os.X_OK):
                        path_python = _p
            
            # Get folder site-packages from python library
            if _path.endswith('site-packages'):
                path_sitepkg = Path(_path).resolve()
                
            # Break loop to avoid reading unecessary files
            if path_python and path_sitepkg:
                break
        
        ### START ###
        ### Only continue if all paths exists ###
        if system_supported and path_bgcython.exists() and path_blender.exists() and path_python.exists() and path_sitepkg.exists():
            
            # Change working directory to Python binaries directory
            os.chdir(path_python.parent.as_posix())
            
            # Print main paths
            print('\n> Blender path is:\n' + path_blender.as_posix() + '\n' +
                '\n> Python path is:\n' + path_python.as_posix() + '\n' +
                '\n> site-packages path is:\n' + path_sitepkg.as_posix() + '\n')
                
            # If pip is not installed
            if not 'pip' in os.listdir(path_sitepkg.as_posix()):
                
                print('pip is not installed, installing it through ensurepip\n')
                    
                # Execute ensurepip
                print('Execute ensurepip')
                import ensurepip
                ensurepip._main()
                
                print('pip successfully installed\n')
            
            # Continue if pip is installed
            if 'pip' in os.listdir(path_sitepkg.as_posix()):
                
                # If Cython is not installed
                if not 'Cython' in os.listdir(path_sitepkg.as_posix()):
                    
                    print('Cython is not installed, installing it through pip\n')
                    
                    # Install Cython through pip
                    call(path_python.name + ' -m pip install Cython')
                    
                    print('Cython successfully installed\n')
                
                # If bgcython is not installed
                if not 'bgcython' in os.listdir(path_sitepkg.as_posix()):
                    
                    print('bgcython is not installed, installing it\n')
                    
                    # Copy bgcython package to site-packages
                    print('Copying bgcython package to site-packages')
                    
                    shutil.copytree(
                        path_bgcython.as_posix(),
                        path_sitepkg.as_posix() + '/bgcython/'
                    )
                        
                    # Copy settings.txt to package folder
                    print('Copying settings.txt package folder')
                    
                    shutil.copyfile(
                        path_bgcython.as_posix() + '/settings.txt',
                        path_sitepkg.as_posix() + '/bgcython/settings.txt'
                        )
                        
                    print('bgcython successfully installed\n')
                    
                    # Open settings file for editing
                    os.startfile(path_sitepkg.as_posix() + '/bgcython/settings.txt')
                    
            print('Installation successfully finished')
                    
        # Change working directory back to current 
        os.chdir(path_current.as_posix())