pynsist/examples/_mu/prep_files.py

import os
from subprocess import run

pjoin = os.path.join

# Run pynsist to gather the necessary files
#run([sys.executable, '-m', 'nsist', 'installer.cfg', '--no-makensis'], check=True)

# Remove NSIS script - we're not using it today
try:
	os.unlink(pjoin('build', 'nsis', 'installer.nsi'))
except FileNotFoundError:
	pass

# Move msvcrt files into Python directory, where they need to be installed
msvcrt_dir = pjoin('build', 'nsis', 'msvcrt')
python_dir = pjoin('build', 'nsis', 'Python')
if os.path.isdir(msvcrt_dir):
	for file in os.listdir(msvcrt_dir):
		os.rename(pjoin(msvcrt_dir, file), pjoin(python_dir, file))
	os.rmdir(msvcrt_dir)
	
# Run 'heat' (part of Wix) to create a list of the files to install
HEAT = os.path.join(os.environ['WIX'], 'bin', 'heat')
run([HEAT, 'dir', pjoin('build', 'nsis'),
		'-out', 'files.wxs',  # Target file (wix xml format)
		'-ag',                # Autogenerated GUIDs for files ('*' - generated at compile time)
		'-sfrag',             # Single fragment. Not sure if it matters, but it looks neater.
		'-cg', 'ApplicationFiles', # Component group. Referenced from wrapper.wxs
		'-dr', 'INSTALLDIR',  # Directory to install files into
		'-srd',               # Suppress Root Directory (don't make 'nsis' folder in install dir)
	], check=True)