github_issues.ex

defmodule Issues.GitHubIssues do
  @user_agent [{"User-agent", "Issues [email protected]"}]

  def fetch(user, project) do
    issues_url(user, project)
    |> HTTPoison.get(@user_agent)
    |> handle_response
  end

  def issues_url(user, project) do
    "https://api.github.com/repos/#{user}/#{project}/issues"
  end

  def handle_response({:ok, %{status_code: 200, body: body}}), do: {:ok, body}
  def handle_response({_, %{status_code: _, body: body}}), do: {:error, body}
end