init

lib/exproj.ex

@@ -0,0 +1,18 @@
+defmodule Exproj do
+  @moduledoc """
+  Documentation for `Exproj`.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> Exproj.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end

lib/mix/tasks/hello.ex

@@ -0,0 +1,9 @@
+defmodule Mix.Tasks.Hello do
+  @moduledoc "Prints a greeting: `mix help hello`"
+  use Mix.Task
+
+  @shortdoc "Prints 'hello' to the console"
+  def run(_args) do
+    IO.puts("hello")
+  end
+end