#!/bin/sh

set -e

exit1() (
	echo >&2 "ERROR: $1"
	exit 1
)

warn() (
	echo >&2 "WARNING: $1"
)

maybestaleuser() {
	warn "Skipping possibly non-stale account for user $user"
}

untouchedinbox() {
	set -e
	h="$1"; shift
	[ -d "$home/Maildir" ]
	find "$home/Maildir/new" -maxdepth 0 -type d -mtime +365 | grep -q .
	find "$home/Maildir/cur" -maxdepth 0 -type d -mtime +365 | grep -q .
}

untouchednewmail() {
	set -e
	h="$1"; shift
	[ -d "$home/Maildir" ]
	find "$home/Maildir/new" -type f -mtime +365 | grep -q
}

for user in $@; do
	home=$(getent passwd "$user" | cut -d: -f6)
	[ -n "$home" ] || exit1 "Failed resolving homedir for user $user"
	if [ -e "$home/.forward" ]; then
		maybestaleuser "$user"
		continue
	fi
	if untouchedinbox "$home" || untouchednewmail "$home"; then
		localrmaccount "$user"
		continue
	fi
	maybestaleuser "$user"
done