Added a basic CLI

lib/elixir_rss/cli.ex

@@ -0,0 +1,43 @@
+defmodule ElixirRss.CLI do
+  @default_host "0.0.0.0"
+  @default_port 8080
+  @default_basepath "/"
+
+  def run(argv) do
+    parse_args(argv)
+    |> process()
+  end
+
+  def parse_args(argv) do
+    OptionParser.parse(
+      argv,
+      strict: [help: :boolean,
+               host: :string,
+               port: :integer,
+               path: :string],
+      aliases: [h: :help])
+    |> elem(0)
+    |> switches_to_internal()
+  end
+
+  defp switches_to_internal(kwargs) do
+    if Keyword.get(kwargs, :help) do
+      :help
+    else
+      {Keyword.get(kwargs, :host, @default_host),
+       Keyword.get(kwargs, :port, @default_port),
+       Keyword.get(kwargs, :path, @default_basepath)}
+    end
+  end
+
+  defp process(:help) do
+    IO.puts("""
+      usage: elixir_rss [--host HOST] [--port PORT] [--path BASEPATH]
+      """)
+    System.halt(0)
+  end
+
+  defp process({host, port, path}) do
+    IO.puts("Host: #{host}, Port: #{port}, Basepath: #{path}")
+  end
+end

lib/elixir_rss/http.ex

@@ -1,4 +1,4 @@
-defmodule ElixirRss.Fetch do
+defmodule ElixirRss.Http do
   def fetch(url) do
     url
     |> HTTPoison.get()