#! /usr/local/bin/zsh
#
# this file:
#   https://dataswamp.org/~incal/sth/scripts/senior

local passwdf=/etc/passwd
local ignore=\(nologin\|root\)
local delim=':'

acn_pos () {
    local pos=$1
    if [[ $pos ]]; then
        local usr=$(egrep -v $ignore $passwdf |
                        sed '$d'              |
                        head -n $pos          |
                        tail -n 1             |
                        cut -d $delim -f 1)
        if [[ $usr != '' ]]; then
            echo "$usr[1].$usr[2,-1]"
        fi
    fi
}

acn_usr () {
    local usr=$1

    local jun="junior"
    local dotjun="$jun[1].$jun[2,-1]"

    local joe="joehckr"
    local dotjoe="$joe[1].$joe[2,-1]"

    if [[ $usr = $jun || $usr = $dotjun ]]; then
        zsh /home/incal/public_html/bot/scripts/junior
    elif [[ $usr[2] != '.' ]]; then
        echo "use $joe for $dotjoe"
    else
        local rusr="$usr[1]$usr[3,-1]"
        egrep -v $ignore $passwdf |
            sed '$d'              |
            egrep -n "^$rusr" -   |
            cut -d $delim -f 1
    fi
}

local pos=1
if [[ $1 != '' ]]; then
    local arg=$1
    if [[ "$arg" =~ "^[0-9]+$" ]]; then
        pos=$arg
        if [[ $pos == 0 ]]; then # secret
            echo "error: failed to unhash non-empty entry"
            return
        fi
    else
        acn_usr $arg
        return
    fi
fi
acn_pos $pos