switched to pyproject.toml setup

MANIFEST.in

+include fact_helper_file/bin/custommime.mgc
+include custommime.mgc
+include *.mgc

pyproject.toml

+[build-system]
+requires = [
+  "setuptools >= 61.0.0",
+  "wheel",
+]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "fact_helper_file"
+version = "0.2.13"
+authors = [
+    {name = "Johannes vom Dorp"}
+]
+license = {file = "LICENSE"}
+urls = {homepage = "https://github.com/fkie-cad/fact_helper_file"}
+dependencies = [
+    "python-magic",
+]
+requires-python = ">=3.7"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["fact_helper_file"]
+exclude = ["test"]
+
+[tool.setuptools.package-data]
+mypkg = ["*.mgc"]
+
 [tool.black]
 line-length = 120
 skip-string-normalization = true
-target-version = ['py37']
+target-version = ["py37"]
 
 [tool.pylint.main]
 init-hook = 'import sys; sys.path.append("./src")'

setup.py

 #!/usr/bin/env python
+from __future__ import annotations
 
 import os
 import sys
 from pathlib import Path
-from subprocess import Popen, PIPE
+from subprocess import run, STDOUT
 
 from setuptools import setup
 
 MODULE_NAME = 'fact_helper_file'
-MIME_DIR = Path(__file__).parent / MODULE_NAME / 'mime'
+MODULE_DIR = Path(__file__).parent / MODULE_NAME
+MIME_DIR = MODULE_DIR / 'mime'
+BIN_DIR = MODULE_DIR / 'bin'
 
 
 class OperateInDirectory:
-    def __init__(self, target_directory: str):
+    def __init__(self, target_directory: str | Path):
         self._current_working_dir = None
         self._target_directory = target_directory
 
     def __enter__(self):
-        self._current_working_dir = os.getcwd()
+        self._current_working_dir = Path.cwd()
         os.chdir(self._target_directory)
 
     def __exit__(self, *_):
         os.chdir(self._current_working_dir)
 
 
-def execute_shell_command(shell_command):
-    with Popen(shell_command, shell=True, stdout=PIPE, stderr=PIPE) as pl:
-        output = pl.communicate()[0].decode('utf-8', errors='replace')
-        return output, pl.returncode
+BIN_DIR.mkdir(exist_ok=True)
 
-
-os.makedirs(str(MIME_DIR.parent / 'bin'), exist_ok=True)
-with OperateInDirectory(str(MIME_DIR)):
-    FILE_OUTPUT, FILE_CODE = execute_shell_command(
+with OperateInDirectory(MIME_DIR):
+    process = run(
         '(cat custom_* > custommime)'
         ' && file -C -m custommime'
         ' && mv -f custommime.mgc ../bin/'
-        ' && rm custommime'
+        ' && rm custommime',
+        shell=True,
+        stderr=STDOUT,
     )
-    if FILE_CODE != 0:
-        sys.exit('Failed to properly compile magic file\n{}'.format(FILE_OUTPUT))
-
-
-setup(
-    name=MODULE_NAME,
-    version='0.2.12',
-    description='Helper functions for file type generation',
-    author='Johannes vom Dorp',
-    url='https://github.com/fkie-cad/fact_helper_file',
-    install_requires=['python-magic'],
-    python_requires='>=3.5',
-    packages=[MODULE_NAME, ],
-    package_data={MODULE_NAME: [str(MIME_DIR.parent / 'bin' / 'custommime.mgc'), ]}
-)
+    if process.returncode != 0:
+        sys.stderr.write(f'Failed to properly compile magic file\n{process.stdout}\n')
+        sys.exit(1)
+
+
+setup()