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#!/bin/bash
# Delete duplicate messages in $1 based on the Message-ID header
maildir=$1
msgid_file="$(mktemp --tmpdir "${0##*/}.XXXXXXXXXX")"
trap "rm -f -- $(printf '%q' "$msgid_file")" EXIT
echo -n 'Generating Message-ID table... '
grep -rH -m1 '^[Mm]essage-[Ii][Dd]:' "$maildir"| \
sed -r 's/(.*):[Mm]essage-[Ii][Dd]:\s*(\S.*)/\2:\1/'| \
sort -n>"$msgid_file"
echo 'done'
< "$msgid_file" sed 's/:.*//'|uniq -d|while read msgid; do
echo "Removing dups of $msgid"
< "$msgid_file" sed -n "s/^$msgid://p"|sed 1d|xargs -d'\n' rm -fv|sed 's/./ &/'
done
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