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#!/bin/bash
#
# Split an mbox into message files, and sort them into directories according
# to message-id splitting.
#
# This needs to run under bash because some of the ${} stuff is a bash-ism.
#
# $Id$
mbox=$1
destdir=messages
export destdir
# *() and other patterns need this set
shopt -s extglob
if [ ! -f $mbox ]; then
echo "mbox $mbox not found" >&2
exit 1
fi
if [ ! -d $destdir ]; then
echo "destination directory $destdir does not exist" >&2
exit 1
fi
if [ $(basename $mbox) = $(basename $mbox .gz) ]; then
cat=cat
else
cat=zcat
fi
tempdir=$(mktemp -d)
export tempdir
$cat $mbox | formail -s sh -c 'cat - > $tempdir/msg.$FILENO'
for message in $tempdir/msg.*; do
# Fetch the Message-Id. Note: due to braindamage at Microsoft we need to
# cope with messages having more than one Message-Id, so we loop here.
formail -x Message-Id < $message | while read messageid; do
# strip the initial " <", the trailing ">", and replace /'s with _
messageid=${messageid##*([< ])}
messageid=${messageid%%>}
messageid=${messageid//\//_}
# fetch the part after the first @ (inclusive)
dir=${messageid##*([^@])}
# escape [, ? and * from it (these are special chars for bash ${} expansion)
diresc=${dir/[/\\[}
diresc=${diresc/\*/\\*}
diresc=${diresc/\?/\\?}
# and fetch the part before the @ (i.e. strip $dir)
file=${messageid%%$diresc}
# create the directory if needed
if [ ! -d "$destdir/$dir" ]; then
mkdir -v "$destdir/$dir" || echo "failed to create $destdir/$dir"
fi
# and link the message into place
if [ ! -f "$destdir/$dir/$file" ]; then
ln $message "$destdir/$dir/$file" || echo "failed to link $message to $destdir/$dir/$file"
fi
done
rm $message
done
rmdir $tempdir # unless something remained
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