Generate start script for PyInstaller from entry point

scripts/dosage.spec

@@ -1,25 +1,40 @@
-# -*- mode: python ; coding: utf-8 -*-
+# SPDX-License-Identifier: MIT
+# Copyright (C) 2017-2020 Tobias Gruetzmacher
 
-block_cipher = None
+# Idea from
+# https://github.com/pyinstaller/pyinstaller/wiki/Recipe-Setuptools-Entry-Point,
+# but with importlib
+def Entrypoint(group, name, **kwargs):
+    import re
+    try:
+        from importlib.metadata import entry_points
+    except ImportError:
+        from importlib_metadata import entry_points
+
+    # get the entry point
+    eps = entry_points()[group]
+    ep = next(ep for ep in eps if ep.name == name)
+    module, attr = re.split(r'\s*:\s*', ep.value, 1)
+
+    # script name must not be a valid module name to avoid name clashes on import
+    script_path = os.path.join(workpath, name + '-script.py')
+    print("creating script for entry point", group, name)
+    with open(script_path, 'w') as fh:
+        print("import sys", file=fh)
+        print("import", module, file=fh)
+        print("sys.exit(%s.%s())" % (module, attr), file=fh)
+
+    return Analysis(
+        [script_path] + kwargs.get('scripts', []),
+        **kwargs
+    )
 
 
-a = Analysis(['../dosage'],
-             pathex=['.'],
-             binaries=[],
-             datas=[],
-             hiddenimports=[],
-             hookspath=['.'],
-             runtime_hooks=[],
-             excludes=[],
-             win_no_prefer_redirects=False,
-             win_private_assemblies=False,
-             cipher=block_cipher,
-             noarchive=False)
+a = Entrypoint('console_scripts', 'dosage')
 
 a.binaries = [x for x in a.binaries if not x[1].lower().startswith(r'c:\windows')]
 
-pyz = PYZ(a.pure, a.zipped_data,
-             cipher=block_cipher)
+pyz = PYZ(a.pure, a.zipped_data)
 exe = EXE(pyz,
           a.scripts,
           a.binaries,
@@ -31,3 +46,5 @@ exe = EXE(pyz,
           upx=False,
           runtime_tmpdir=None,
           console=True)
+
+# vim: set ft=python: