Make gnuplot_bin private

Author: devstopfix

README.md

@@ -100,7 +100,7 @@ by adding `gnuplot` to your list of dependencies in `mix.exs`:
 ```elixir
 def deps do
   [
-    {:gnuplot, "~> 0.19.86"}
+    {:gnuplot, "~> 0.19.87"}
   ]
 end
 ```

lib/gnuplot.ex

@@ -24,6 +24,7 @@ defmodule Gnuplot do
 
   alias Gnuplot.Commands
   import Gnuplot.Dataset
+  import Gnuplot.Bin
 
   @type command_term :: atom() | charlist() | number() | Range.t() | String.t()
 
@@ -65,17 +66,6 @@ defmodule Gnuplot do
       |> Stream.run()
   end
 
-  @doc """
-  Find the gnuplot executable.
-  """
-  @spec gnuplot_bin() :: {:error, :gnuplot_missing} | {:ok, :file.name()}
-  def gnuplot_bin do
-    case :os.find_executable(String.to_charlist("gnuplot")) do
-      false -> {:error, :gnuplot_missing}
-      path -> {:ok, path}
-    end
-  end
-
   @doc "Build a comma separated list from a list of terms."
   def list(xs) when is_list(xs), do: %Commands.List{xs: xs}
 

lib/gnuplot/bin.ex

@@ -0,0 +1,14 @@
+defmodule Gnuplot.Bin do
+  @moduledoc false
+
+  @doc """
+  Find the gnuplot executable.
+  """
+  @spec gnuplot_bin() :: {:error, :gnuplot_missing} | {:ok, :file.name()}
+  def gnuplot_bin do
+    case :os.find_executable(String.to_charlist("gnuplot")) do
+      false -> {:error, :gnuplot_missing}
+      path -> {:ok, path}
+    end
+  end
+end

lib/gnuplot/commands.ex

@@ -5,6 +5,8 @@ defmodule Gnuplot.Commands do
 
   defprotocol Command do
     @spec formatg(term()) :: String.t()
+
+    @doc "Format Elixir term as a Gnuplot String"
     def formatg(cmd)
   end
 

mix.exs

@@ -4,7 +4,7 @@ defmodule Gnuplot.MixProject do
   def project do
     [
       app: :gnuplot,
-      version: "0.19.86",
+      version: "0.19.87",
       elixir: "~> 1.6",
       start_permanent: Mix.env() == :prod,
       description: "Interface between Elixir and Gnuplot graphing library",

test/gnuplot_test.exs

@@ -54,7 +54,7 @@ defmodule GnuplotTest do
 
   @tag gnuplot: true
   test "Gnuplot is installed" do
-    assert {:ok, path} = G.gnuplot_bin()
+    assert {:ok, path} = Gnuplot.Bin.gnuplot_bin()
     assert File.exists?(path)
   end