@echo off

REM
REM Check for commandline args
REM
if "[%~1]" == "[]" goto error
if "[%~2]" == "[]" goto error

set LN=ln.exe

if not exist "%~1" goto error
if not exist "%~2" goto error

setLocal EnableDelayedExpansion

REM
REM Get date and time for timestamps on directories
REM
for /f "delims=" %%a in ('%LN% --datetime') do set DATETIMESTAMP=%%a

set SourceDir=%~n1
set DestDir=%~2

REM
REM Do the Delorean Copy
REM
pushd %DestDir%
if exist "%SourceDir% - ????-??-?? ??-??-??" (
  for /f "delims=" %%a in ('dir /b /AD /O:N "%SourceDir% - ????-??-?? ??-??-??"') do set LastBackup=%%a
  popd
  %LN% --delorean "%~1" "%DestDir%\!LastBackup!" "%DestDir%\%SourceDir% - %DATETIMESTAMP%"
) else (
  popd
  %LN% --copy "%~1" "%DestDir%\%SourceDir% - %DATETIMESTAMP%"
)

goto ausmausraus

REM
REM Usage
REM
:error
echo DeLorean Copy: Argument is missing. Usage DeLoreanCopy ^<SourcePath^> ^<DestPath^>
echo e.g. DeLoreanCopy c:\data\source c:\data\backup

:ausmausraus
echo on