#!/usr/bin/env bash
trap 'kill -TERM 0' EXIT

read s <<< "$1"
files=(/var/irclogs/_esoteric/????-??-??.txt)

for file in "${files[@]:${#files[@]} - 30}"
do {
	line=
	while read -r t n m; do [[ $n =~ $s ]] && line="$t $n $m"; done | tail -n1 <"$file"
		[[ -n "$line" ]] && { printf '%s:%s\n' "${file##*/}" "$line"; exit; }
	} &
done | tail -n1

wait && echo 'well, not lately'