#!/bin/bash
#
# Report statistics for each Maildir mailbox:
#
#   Total files (messages).
#
#   Disk space used.
#
#   Size after being tar-gzipped.
#
# Robin Whittle http://www.firstpr.com.au 24 September 2002
#
# My reason for such a report is to help me understand the
# contribution of each mailbox to my nightly tar.gzip backup
# so I can prune intelligently and keep it smaller than 
# a CDR.  The tar.gz size statistics are not an absolutely 
# accurate representation of the mailbox's contribution to 
# the final tar.gz file, since that will involve longer
# pathnames and other finer points, but it is plenty good
# enough to help me prune.
#
# This script works on the mailbox files found in one user's
# /home/user/Maildir.   Run it from the user's home directory
# as either the user or root.   This is intended to work with
# the Courier IMAPD arrangement where the Inbox is the files
# found in ~/Maildir/new and ~/Maildir/cur, and where
# all other mailboxes are subdirectories, of ~/Maildir/ with
# each sub-directory starting with a ".".  From the IMAP 
# client's point of view, mailboxes can contain mailboxes, 
# but Courier IMAPD makes all levels of mailbox appear as
# subdirectories in ~/Maildir/ .  For instance:
#
#    ~/Maildir/.Lists.Mail-Courier-users
#
# is the mailbox "Mail-Courier-users" in the Lists mailbox.
#
#
# Based on a script Michael Carmack (http://www.karmak.org)
# contributed to the Courier Users list 23 September 2002.  
# His script worked on the total contents of each "Maildir" 
# directory and all its subdirectories for each user: 
#
#   /home/*/Maildir.   
#
# So it had to be run as root and gives a single set of
# statistics for each user.
#
# This is modified with double quotes as per Michael's 
# suggestion to cope with filenames with spaces in them.
#
# Thanks Michael for cooking up the original script!
#
# Make sure /tmp is big enough to handle the largest tar-gz file!

tmpfile=/tmp/compressedmaildir.${RANDOM}.tgz


# Was:
# for maildir in /home/*/Maildir; do

####  I want it to find only those directories starting with a dot!
####  Thanks Michael for ".[^.]*".

# for maildir in Maildir/.[^.]*; do  

# I will cd to ~/Maildir" first and work from there:

cd Maildir

for maildir in .[^.]*; do  

    echo
    echo    "Mailbox:                          "${maildir}""
    echo -n "Number of files:          "
    find "${maildir}" -type f | wc -l
    echo -n "Total size of all files:          "
    find "${maildir}" -type f -printf '%s\n' | \
        awk 'BEGIN { t=0 } { t+=$1 } END {
          if (t<1024) print t,"bytes";
          else if (t<1048576) print t/1024,"kB";
          else if (t<1073741824) print t/1048576,"MB";
          else print t/1073741824,"GB";
        }'
    echo -n "Disk space used:                                "
    du -sh "${maildir}" | cut -f1
    echo -n "Approx tar.gz size:                                          "
    tar -czf ${tmpfile} "${maildir}" 2>/dev/null
    ls -lh ${tmpfile} | awk '{ print $5 }'
    echo
    
done

rm -f ${tmpfile}

cd ..
exit 0