app version: Write a .gitversion file with short hash from setup.py

.gitignore

@@ -1,3 +1,4 @@
+.gitversion
 .DS_Store
 build
 dist.*

constants.py

@@ -9,6 +9,7 @@ found necessary to move out of other files.
 # config.py
 appname = 'EDMarketConnector'
 applongname = 'E:D Market Connector'
+GITVERSION_FILE = '.gitversion'
 
 # protocol.py
 protocolhandler_redirect = 'edmc://auth'

setup.py

@@ -12,6 +12,7 @@ import os
 import platform
 import re
 import shutil
+import subprocess
 import sys
 from distutils.core import setup
 from os.path import exists, isdir, join
@@ -21,10 +22,34 @@ from typing import Any, Generator, Set
 import semantic_version
 
 from config import appcmdname, applongname, appname, appversion, copyright, update_feed, update_interval
+from constants import GITVERSION_FILE
 
 if sys.version_info[0:2] != (3, 9):
     raise AssertionError(f'Unexpected python version {sys.version}')
 
+# Retrieve current git short hash and store in file GITVERSION_FILE
+try:
+    git_cmd = subprocess.Popen('git rev-parse --short HEAD'.split(),
+                               stdout=subprocess.PIPE,
+                               stderr=subprocess.STDOUT
+                               )
+    out, err = git_cmd.communicate()
+
+except Exception as e:
+    print(f"Couldn't run git command for short hash: {e!r}")
+    exit(-1)
+
+else:
+    git_shorthash: str = out.decode().rstrip('\n')
+    if re.match(r'^[0-9a-f]{7,}$', git_shorthash) is None:
+        print(f"'{git_shorthash}' doesn't look like a valid git short hash!")
+        exit(-2)
+
+    with open(GITVERSION_FILE, 'w+', encoding='utf-8') as gvf:
+        gvf.write(git_shorthash)
+
+print(f'Git short hash: {git_shorthash}')
+
 if sys.platform == 'win32':
     assert platform.architecture()[0] == '32bit', 'Assumes a Python built for 32bit'
     import py2exe  # noqa: F401 # Yes, this *is* used