ref: 2e1b043bf2ca680cba7b44e62564aefaaf0ff483
dir: /win32/genversion.bat/
@echo off
setlocal enableextensions enabledelayedexpansion
for /f %%v in ('git --git-dir="%~dp0..\.git" describe --tags --match "v*"') do set version=%%v
if not "%version%"=="" goto :gotversion
if exist "%~dp0..\version.mk" goto :getversion
echo Git cannot be found, nor can version.mk. Generating unknown version.
set version=unknown
goto :gotversion
:getversion
for /f "delims== tokens=2" %%v in (%~dps0..\version.mk) do set version=%%v
set version=!version:^"=!
set version=!version: =!
:gotversion
set version_out=#define %~2 "%version%"
set version_mk=%~2 = "%version%"
echo %version_out%> "%~1_temp"
if %version%==unknown goto :skipgenerate
echo # static version string; update manually every release.> "%~dp0..\version.mk"
echo %version_mk%>> "%~dp0..\version.mk"
:skipgenerate
echo n | comp "%~1_temp" "%~1" > NUL 2> NUL
if not errorlevel 1 goto exit
copy /y "%~1_temp" "%~1"
:exit
del "%~1_temp"