roll.zsh

# roll 2d6+3
function roll {
    local match total
    local -a rolls

    if ! [[ "$1" =~ '([0-9]+)d([0-9]+)(\+[0-9]+)?' ]]; then
        echo "usage: roll 2d6+3" 1>&2
        return 1
    fi

    for ((n=0;n<$match[1];n++)); do
        ((total += m = $[$RANDOM % $match[2] + 1]))
        rolls+=($m)
    done
    ((total += match[3]))

    local IFS="+"
    echo "\u001b[1m$total\u001b[0m (${rolls[*]}$match[3])"
}