Hi
Recently I wanted to check if a File is a Picture, and I don’t like checking just the extension.
So with the help of this:

  def is_picture(file) do
    {_, content} = :file.open(file, [:read, :binary])
    fileHeader = :file.read(content, 8)
    :file.close(content)
    case fileHeader do
      {:ok, <<0xFF, 0xD8, _, _, _, _, _, _>>} -> true #jpg
      {:ok, <<0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A>>} -> true #png
      {:ok, <<0x47, 0x49, 0x46, 0x38, 0x37, 0x61, _, _>>} -> true #gif standard
      {:ok, <<0x47, 0x49, 0x46, 0x38, 0x39, 0x61, _, _>>} -> true #gif animated
      _ -> false
    end
  end

As I’m still not experienced with Elixir, I wonder how would you write such a function in an elegant way?