ruby script to search gitter archives (requires `oga` rubygem)

gitter-search.rb

#!/usr/bin/env ruby
#
# gitter-search [--date YYYYMMDD] [--user @USERNAME] ORG/ROOM [PATTERN]
#

require 'oga'
require 'optparse'
require 'net/http'

options = {}

OptionParser.new do |opt|
  opt.banner = "Usage: #{File.basename $0} [--date YYYY/MM/DD] [--user @USERNAME] ORG/ROOM [PATTERN]"

  opt.separator ""

  opt.on("--date=DATE", "Search only a specific date")   { |date| options[:date] = date }
  opt.on("--user=USER", "Limit search to specific user") { |user| options[:user] = user }

  opt.separator ""
  opt.separator "Examples"
  opt.separator ""
  opt.separator "  Search for all messages in ManageIQ/miq_bot by @NickLaMuro"
  opt.separator ""
  opt.separator "    $ gitter --user NickLaMuro ManageIQ/miq_bot"
  opt.separator ""
  opt.separator "  Search for all messages in ManageIQ/miq_bot on 2019/07/02"
  opt.separator ""
  opt.separator "    $ gitter --date 2019/07/02 ManageIQ/miq_bot"
  opt.separator ""
  opt.separator "  ... now with messages containing the word 'fun'"
  opt.separator ""
  opt.separator "    $ gitter --date 2019/07/02 ManageIQ/miq_bot fun"
  opt.separator ""
  opt.separator ""
end.parse!

host = "https://gitter.im/"
room = ARGV.shift
path = "/#{room}/archives"
user = "@#{options[:user]}" if options[:user]
date = options[:date]

pattern     = ARGV.shift
link_regexp = /href="(#{path}[^"]*)"/
room_format = /^[a-z\d](?:[a-z\d]|-(?=[a-z\d])){0,38}\/[a-z\d\-_\/]*$/i

raise "Invalid ORG/ROOM format" unless room =~ room_format

archives_list = Net::HTTP.get URI("#{host}#{path}")
archive_paths = archives_list.scan(link_regexp).map(&:first)

archive_paths.each do |archive|
  next if date && !archive.include?(date)

  printed = false
  document = Oga.parse_html Net::HTTP.get(URI("#{host}#{archive}"))

  document.css('.chat-item__content').each do |element|
    found_user    = element.at_css('.chat-item__username')
    @current_user = found_user.text if found_user
    chat_msg      = element.at_css('.chat-item__text')

    next if user && @current_user != user
    next if pattern && !chat_msg.text.include?(pattern)

    unless printed == true
      puts
      puts "Archive: #{host}#{archive}"
      puts
      printed = true
    end

    print "#{@current_user}: "
    puts  chat_msg.text.strip
  end
end