@echo off
setlocal EnableDelayedExpansion
:: Variables
set driveletter=%1
set RCport=%2

:: Check that the folder is valid, otherwise wait until it is
echo " "| set /p dummyName=Waiting for %driveletter%: to be ready

:LOOP1
vol %driveletter%: >nul 2>nul
if errorlevel 1 (
echo " "| set /p dummyName=.
timeout /t 1 > nul
goto LOOP1
) else (
echo.
echo %driveletter%: is now ready^^!
)

echo You may use the cloud-drive normally while the cache is being warmed up...
FOR /F "tokens=* USEBACKQ" %%F IN (`rclone rc vfs/refresh recursive^=true --rc-addr localhost:%RCport%`) do (
set output=%%F
:: Check if any line in command output contains OK and then display message
if not "!output:OK=!"=="!output!" echo Cache warmup for !driveletter!: OK^^!
)