ref: a2be3388fb5905efa4652adf859ea3b7e1ceaea6
dir: /win32/genversion.bat/
@echo off
setlocal enableextensions enabledelayedexpansion
for /f %%v in ('cd "%~dp0.." ^&^& git status ^>NUL 2^>NUL ^&^& git describe --tags --match "v*" --dirty 2^>NUL') do set version=%%v
if not "%version%"=="" set version=!version:~1! && goto :gotversion
if exist "%~dp0..\package_version" goto :getversion
echo Git cannot be found, nor can package_version. Generating unknown version.
set version=unknown
goto :gotversion
:getversion
for /f "delims== tokens=2" %%v in (%~dps0..\package_version) do set version=%%v
set version=!version:"=!
:gotversion
set version=!version: =!
set version_out=#define %~2 "%version%"
echo %version_out%> "%~1_temp"
echo n | comp "%~1_temp" "%~1" > NUL 2> NUL
if not errorlevel 1 goto exit
copy /y "%~1_temp" "%~1"
:exit
del "%~1_temp"