class Github::Repos::Comments

def list(user_name, repo_name, params={})
  set :user => user_name, :repo => repo_name
  assert_presence_of user, repo
  normalize! params
  response = if (sha = params.delete('sha'))
    get_request("/repos/#{user}/#{repo}/commits/#{sha}/comments", params)
  else
    get_request("/repos/#{user}/#{repo}/comments", params)
  end
  return response unless block_given?
  response.each { |el| yield el }
end