sleepbot.rb

#!/usr/bin/env ruby
require "slack"

Slack.configure do |config|
  config.token = ENV['SLACK_TOKEN']
end

channel = ENV['SLACK_CHANNEL']

# Slack.auth_test
cl       = Slack.client
users    = cl.users_list presence: true
present = users["members"].select { |u| u["presence"] == "active" }.map {|u| "@" + u["name"]}

if present.length > 0
  msg = "#{present.join(", ")} – jest #{Time.now.strftime "%H:%M"}, pora spać!"
  cl.chat_postMessage channel: channel, text: msg, username: "SleepBot", icon_emoji: ":sleeping:"
end