#!/usr/bin/env zsh

let greather_than_zero=0
if [[ "${1}" == '-g' ]]; then
    greather_than_zero=1
fi

lines=(${(f)"$(mu find '(maildir:/protonmail/Inbox or maildir:/ucsc-gmail/Inbox) AND flag:unread' 2>/dev/null)"})
if [[ ${#lines} > 0 ]] || ! (( greather_than_zero )); then
    printf '%d' "${#lines}"
fi