class Pronto::Formatter::GithubPullRequestFormatter

def create_comment(client, sha, body, path, position)
  comment = Github::Comment.new(sha, body, path, position)
  comments = client.pull_comments(sha)
  existing = comments.any? { |c| comment == c }
  client.create_pull_comment(comment) unless existing
end

def format(messages, repo)
  messages = messages.uniq { |message| [message.msg, message.line.new_lineno] }
  client = Github.new(repo)
  commit_messages = messages.map do |message|
    body = message.msg
    path = message.path
    commits = repo.commits_until(message.commit_sha)
    line = nil
    sha = commits.find do |commit|
      patches = repo.show_commit(commit)
      line = patches.find_line(message.full_path, message.line.new_lineno)
      line
    end
    create_comment(client, sha, body, path, line.position)
  end
  "#{commit_messages.compact.count} Pronto messages posted to GitHub"
end