Get last Jekyll article's title and url

travisci-article-part3.rb

TWEET_FILE="new-article.txt"

desc "Check if we have a new article and create the message"
task :prepare_new_article_tweet do
  title, article_url  = last_article
  # Check if article already published
  uri = URI(article_url)
  res = Net::HTTP.get_response(uri)
  if res.is_a?(Net::HTTPNotFound)
    puts "If successful deployment, we should tweet"
    message = "#{title} - #{article_url}"
    system "echo #{message} > #{TWEET_FILE}"
  else
    puts "Last article already published"
  end
end

desc "Tweet the newly published article"
task :tweet do
  if File.exists?(TWEET_FILE)
    message = File.read(TWEET_FILE)
    puts "Tweeting #{message}"
    `bundle exec t update "#{message}"`
  end
end

def last_article
  filename =  nil

  Dir.chdir("_posts") do
    filenames = `git ls-files`.split("\n")
    filename = filenames.last
  end

  title = nil
  # Try to find title inside article
  File.read("_posts/#{filename}").each_line do |line|
    next if /^---$/.match(line)
    if match = /title: (.*)/.match(line)
      title = match[1]
      break
    end
  end
  basename = filename.split('.')[0]
  matched, year, month, day, name = /^(\d{4})-(\d{2})-(\d{2})-(.*)$/.match(basename).to_a
  if title.nil?
    # build title from filename if not found
    title = name.gsub(/-/, ' ').capitalize
  end
  article_url = "https://netbe.github.io/#{year}/#{month}/#{day}/#{name}"
  return title, article_url
end