Telegram bot for GitHub follower notifications

notify_followers.sh

#!/usr/bin/env bash

set -e

file="followers.txt"
followers=()
page=1
per_page=100
page_result=()
# github_token=
# telegram_bot_token=
# telegram_chat_id=

notify() {
  curl -s -X POST \
    -H "Content-Type: application/x-www-form-urlencoded; charset=utf-8" \
    --data "chat_id=${telegram_chat_id}" \
    --data-urlencode "text=${1}" \
    --data "parse_mode=markdown" \
    "https://api.telegram.org/bot${telegram_bot_token}/sendMessage"
}

while true; do
  readarray -t page_result <<<$(curl -s \
    -X GET \
    -H "Accept: application/vnd.github+json" \
    -H "Authorization: Bearer ${github_token}" \
    -H "X-GitHub-Api-Version: 2022-11-28" \
    "https://api.github.com/user/followers?page=${page}&per_page=${per_page}" | jq -r '.[].login')
  if [ ${#page_result[@]} -eq 1 ]; then
    break
  fi
  followers+=("${page_result[@]}")
  page=$((page + 1))
done

printf "%s\n" "${followers[@]}" >"${file}"
diff_result=$(diff -u "old_${file}" "${file}" | tail -n +4 | awk '$1 ~ /^+|^-/' | sed -E "s/^(\+|-)/\1 https:\/\/github.com\//g")
if [ -n "${diff_result}" ]; then
  notify "${diff_result}"
  notify "$(wc -l <"old_${file}") -> $(wc -l <"${file}")"
fi
printf "%s\n" "${followers[@]}" >"old_${file}"