setup.py: transition to setuptools

Also reformat it for black&flake8, and get the version number from the
VERSION file.

Change-Id: I5495a88f75bae224a21e4a125af4b4869b38727a
TN: V707-013

Author: pmderodat

.gitignore

@@ -2,3 +2,5 @@
 out
 tmp*
 gnatpython
+*.egg-info
+build

.pre-commit-config.yaml

@@ -4,14 +4,14 @@ repos:
     hooks:
     - id: black
       types: [file]
-      files: ^gnatdbg/.*\.py$
+      files: ^(gnatdbg/|setup).*\.py$
       args: [--line-length=79]
   - repo:  https://github.com/pycqa/flake8
     rev: 4.0.1
     hooks:
     - id: flake8
       types: [file]
-      files: ^gnatdbg/.*\.py$
+      files: ^(gnatdbg/|setup).*\.py$
       additional_dependencies:
         - flake8-bugbear
         - flake8-builtins

VERSION

@@ -0,0 +1 @@
+23.0

setup.py

@@ -1,17 +1,24 @@
 #! /usr/bin/env python
 
-from distutils.core import setup
+import os.path
 
+from setuptools import setup
 
-setup(
-    name='GNATdbg',
-    version='0.1-dev',
-    author='AdaCore',
-    author_email='[email protected]',
-    url='https://github.com/AdaCore/gnat-gdb-scripts',
-    description='Python helpers in GDB to deal with the GNAT runtime for Ada',
-    packages=['gnatdbg'],
 
+# The actual version is stored in a separate file to ease automatic updates
+version_file = os.path.join(os.path.dirname(__file__), "VERSION")
+with open(version_file) as f:
+    version = f.read().strip()
+
+
+setup(
+    name="GNATdbg",
+    version=version,
+    author="AdaCore",
+    author_email="[email protected]",
+    url="https://github.com/AdaCore/gnat-gdb-scripts",
+    description="Python helpers in GDB to deal with the GNAT runtime for Ada",
+    packages=["gnatdbg"],
     # This requires to be run in GDB's embedded Python interpreter
     requires=[],
 )