#!/bin/sh -e
# Print to stdout a list of duplicate messages in a maildir.

cd "$1"
test -e cur

f=/tmp/flag.$$
mkdir $f
trap 'echo >&2 cleaning up; rm -r /tmp/flag.$$' 0

find cur new -type f | while read fn ; do
	if grep -q -i '^message-id:' $fn ; then
		:
	else
		echo >&2 "no-id $fn"
		continue
	fi
	sum=`grep -i '^message-id:' $fn | md5sum - | awk '{print $1}'`
	if [ -e $f/$sum ] ; then
		echo >&2 "$fn is dup of `cat $f/$sum`"
		echo $fn
	else
		echo $fn >$f/$sum
	fi
done