tg-notify.bash

#!/usr/bin/env -S bash

TOKEN=""
CHAT_ID=""

declare -A PIDS

function notify() {
    local URL="$1"
    local PID="$2"
    local MESSAGE="$3"
    wget -qO->>/dev/null -U "GayRobot (like TelegramBot)" \
        --post-data "chat_id=${CHAT_ID}&text=<b><a href=\"${URL}\">${PID}</a> ${MESSAGE}</b>&parse_mode=HTML&disable_web_page_preview=True" \
        "https://api.telegram.org/bot${TOKEN}/sendMessage"
}

function check() {
    local PID=$1
    [[ -d "/proc/${PID}" ]] && return 0 || return 1
}

function download() {
    local URL="$1"
    local NAME="$2"
    PIDS["$URL"]+=$(wget --no-check-certificate -U "Mozilla/5.0" -qO "$NAME" -bc "$URL" | grep -Ewo "[0-9]+")
}

function main() {
    while IFS=' ' read -r link name; do download "$link" "$name"; done < links.txt # format: https://example.com/deb.iso deb.iso

    while [[ "${#PIDS[@]}" != 0 ]]; do
        for k in "${!PIDS[@]}"; do
            if [[ $(check ${PIDS["$k"]}; echo $?) != 0 ]]; then
                notify "$k" "${PIDS["$k"]}" "download is complete."
                unset "PIDS["$k"]"
                sleep 3s
            fi
        done
        sleep 60s
    done

    exit 0
}

main & disown
echo "main PID: $!"
exit 0