meet.rb

# https://developers.google.com/calendar/api/quickstart/ruby
require "google/apis/calendar_v3"
require "googleauth"
require "googleauth/stores/file_token_store"
require "date"
require "fileutils"

OOB_URI = "urn:ietf:wg:oauth:2.0:oob".freeze
APPLICATION_NAME = "Google Calendar API Ruby Quickstart".freeze
CREDENTIALS_PATH = "credentials.json".freeze
TOKEN_PATH = "token.yaml".freeze
SCOPE = Google::Apis::CalendarV3::AUTH_CALENDAR_READONLY

def authorize
  client_id = Google::Auth::ClientId.from_file CREDENTIALS_PATH
  token_store = Google::Auth::Stores::FileTokenStore.new file: TOKEN_PATH
  authorizer = Google::Auth::UserAuthorizer.new client_id, SCOPE, token_store
  user_id = "default".freeze
  credentials = authorizer.get_credentials user_id
  if credentials.nil?
    url = authorizer.get_authorization_url base_url: OOB_URI
    puts url
    code = gets
    credentials = authorizer.get_and_store_credentials_from_code(
      user_id: user_id, code: code, base_url: OOB_URI
    )
  end
  credentials
end

service = Google::Apis::CalendarV3::CalendarService.new
service.client_options.application_name = APPLICATION_NAME
service.authorization = authorize

calendar_id = "primary".freeze
response = service.list_events(
  calendar_id,
  max_results:   20,
  single_events: true,
  order_by:      "startTime",
  time_min:      "#{Date.today.to_s}T00:00:00+09:00",
  time_max:      "#{Date.today.to_s}T23:59:59+09:00"
)
response.items.map do |e|
  link = e.conference_data&.entry_points&.find{|ep| ep.entry_point_type == "video" }&.uri
  puts "#{e.start.date_time.to_s[11..15]} #{link} - #{e.summary}" if link
end

puts "--"

loop do
  link = response.items.find {|e| e.start.date_time.to_s[0..15] == DateTime.now.rfc3339[0..15] }
    &.conference_data&.entry_points&.find{|ep| ep.entry_point_type == "video" }&.uri
  puts "#{DateTime.now.rfc3339[11..15]} #{link}"
  system "open -a '/Applications/Google Chrome.app' #{link}" if link
  sleep 60
end