First commit

lib/xler.ex

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+defmodule Xler do
+  alias Xler.Native
+
+  @moduledoc """
+  Documentation for Xler.
+  """
+
+  @doc """
+  Show the available worksheets for file.
+
+  ## Examples
+
+      iex> Xler.worksheets("file.xls")
+      {:ok, ["Sheet 1"]}
+
+  """
+  def worksheets(filename), do: filename |> Native.worksheets()
+
+  @doc """
+  Parses a specific worksheet from a file
+
+  Returns an list (of rows) with a list of columns
+
+  ## Examples
+
+      iex> Xler.parse("file.xls", "Sheet 1")
+      {:ok, [["Date", "Text"]]}
+
+  """
+  def parse(filename, worksheet), do: filename |> Native.parse(worksheet)
+end

lib/xler/native.ex

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+defmodule Xler.Native do
+  use Rustler, otp_app: :xler, crate: :xler_native
+
+  def parse(_filename, _worksheet), do: error()
+  def worksheets(_filename), do: error()
+
+  defp error, do: :erlang.nif_error(:nif_not_loaded)
+end