rmdir.bat

@echo off
:: Recursively remove empty directories.
:: Place this into Windows+R shell:sendto as rmdir.bat
:: Then you can use "Send to" "rmdir.bat" to get rid ob all empty directories.
::
:: This is free as in free beer, free speech and free baby
::
:: Why does /s in rmdir cause catastrophic removal of all files instead of removing only empty directories?
::
:: Why is there no way to iterate directories depth-first?
::
:: How do I loop over a loop variable like in: for %%a in (%*) do
:: parser error:  for /r %%a %%b in (.) do
:: does not work: for /r !a! %%b in (.) do
::
:: What could be done in 1 line (or some single reasonable command) hence has to look like this:

set FAIL=

:ARGS loop until all args are processed
if //==/%1/ goto END

:LOOP as long as we succeeded in removeing some empty directory
set AGAIN=0

for /r %1 %%x in (.) do (
  set LAST="%%~x"
  rmdir "%%~x" && set AGAIN=1
)

if %AGAIN% NEQ 0 goto LOOP

:: If the directory still exists, rmdir did not work.
:: Then remember last encountered directory (which must have failed)
if exist %1 set FAIL=%LAST%

:: Process next argument
shift
goto :ARGS

:END
if not //==/%FAIL%/ (
  echo FAILED DIRECTORY: %FAIL%
::  pause not needed here, as the newer terminal waits on error codes
  exit 1
)