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#! /bin/sh
set -euf
# require flock from util-linux (pkgs.utillinux)
if test "${FLOCK-}" != "$state_file"; then
exec env FLOCK="$state_file" flock "$state_file" "$0" "$@"
fi
to="$_from"
test -e "$state_file" || touch "$state_file"
# print messages
sed -n '/^'"$to"' /{
s/^\([^ ]\+\) \([^ ]\+\) <\([^>]\+\)> \(.*\)/\1: \4 2-- \2, \3/p
}' "$state_file"
# delete messages
sed -i '/^'"$to"' /{
d
}' "$state_file"
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