#!/usr/bin/env bash

out="if (\$http_user_agent ~* \""

# loop lists
for filename in ./lists/*.txt; do
    # line by line
    while read -r line; do
        # ignore empty
        [ -z "$line" ] && continue
        # ignore comments
        [[ $line =~ ^#.* ]] && continue

        # add to out
        out="$out$line|"
    done < $filename
done

out=${out::-1}
out="$out\") {\n    return 444;\n}\n"

printf "$out"