More on learning from imap folders

[LuKreme]

I built the following script:

#/bin/bash

VROOT="/usr/local/virtual/";

for i in `ls -d ${VROOT}*@*` ; do
   echo "`date`"
   echo "Processing ${i}"
   J_PATH="${i}/.Junk"
   H_PATH=${i}/"NotJunk"

  if test -d ${J_PATH}; then
    /usr/local/bin/sa-learn --spam -u vpopmail "$J_PATH/{new,cur}"
  else
    echo "No $J_PATH"
  fi

  if test -d ${H_PATH}; then
    /usr/local/bin/sa-learn --ham -u vpopmail "$H_PATH"
    mv "$H_PATH/{cur,new}/*" ${VROOT}${i}/cur
  else
    echo "No $H_PATH"
  fi

  echo ""
done

And it appears to work fine, except that it takes 20 seconds to process an 
entirely empty folder

---OUTPUT
Sun Mar 11 13:17:24 MDT 2012
Processing /usr/local/virtual/ben@…
Learned tokens from 0 message(s) (0 message(s) examined)

Sun Mar 11 13:17:44 MDT 2012
---END

# ls -lsR /usr/local/virtual/ben\@…/.Junk/
total 6
2 drwx------  2 root  vpopmail  512 Mar  8 04:21 cur
2 drwx------  2 root  vpopmail  512 Mar  8 04:21 new
2 drwx------  2 root  vpopmail  512 Mar  8 04:21 tmp

/usr/local/virtual/b...@xanmax.com/.Junk/cur:
total 0

/usr/local/virtual/b...@xanmax.com/.Junk/new:
total 0

/usr/local/virtual/b...@xanmax.com/.Junk/tmp:
total 0

This seems like a lot of time for sa-learn to process 0 files. Long enough that 
I probably need to add some logic to check for actual files before passing the 
directory to sa-learn. Is this sort of delay normal?

As for the logic, I was thinking of something like this:

    ISSPAM=`find "$J_PATH/{cur,new}" -type f`
    if [ ! $ISSPAM ]; then
      /usr/local/bin/sa-learn --spam -u vpopmail "$J_PATH/{new,cur}"
    fi


-- 
I can't die, I haven't seen The Jolson Story