andry81/tacklelib

@echo off

setlocal DISABLEDELAYEDEXPANSION

if "%~1" == "" (
  echo.%~nx0: error: variable's name is not defined.
  exit /b 255
) >&2

if "%~2" == "" (
  echo.%~nx0: error: variable's value is not defined: "%~1".
  exit /b 255
) >&2

if defined %~1 exit /b 0

for /F "tokens=* delims="eol^= %%i in ("%~2\.") do set "RETURN_VALUE=%%~fi"
rem set "RETURN_VALUE=%RETURN_VALUE:\=/%"
(
  endlocal
  set "%~1=%RETURN_VALUE%"
)

exit /b 0