All modules have an intro.

lib/koans.ex

@@ -83,15 +83,12 @@ defmodule Koans do
 
   defmacro __before_compile__(env) do
     koans = koans(env)
-    intro = extract_into(env)
     quote do
       def all_koans do
         unquote(koans)
       end
 
-      def intro do
-        unquote(intro)
-      end
+      def intro, do: @intro
     end
   end
 
@@ -101,13 +98,6 @@ defmodule Koans do
     |> Enum.reverse
   end
 
-  defp extract_into(env) do
-    env.module
-    |> Module.get_attribute(:intro)
-    |> default("")
-    |> String.strip
-  end
-
   defp default(nil, n), do: n
   defp default(n, _), do: n
 end

lib/koans/02_strings.ex

@@ -1,6 +1,8 @@
 defmodule Strings do
   use Koans
 
+  @intro "Strings"
+
   koan "Strings are there to represent text" do
     assert "hello" == ___
   end

lib/koans/03_atoms.ex

@@ -1,6 +1,8 @@
 defmodule Atoms do
   use Koans
 
+  @intro "Atoms"
+
   koan "Atoms are sort of like strings" do
     adam = :human
     assert adam == ___

lib/koans/04_tuples.ex

@@ -1,6 +1,8 @@
 defmodule Tuples do
   use Koans
 
+  @intro "Tuples"
+
   koan "Tuples can contain different things" do
     assert {:a, 1, "hi"} == ___
   end

lib/koans/05_lists.ex

@@ -1,6 +1,8 @@
 defmodule Lists do
   use Koans
 
+  @intro "Lists"
+
   koan "We can see what is ahead" do
     assert List.first([1, 2, 3]) == ___
   end

lib/koans/06_keyword_lists.ex

@@ -1,6 +1,8 @@
 defmodule KeywordLists do
   use Koans
 
+  @intro "KeywordLists"
+
   koan "Like maps, keyword lists are key-value pairs" do
     kw_list = [foo: "bar"]
 

lib/koans/07_maps.ex

@@ -1,6 +1,8 @@
 defmodule Maps do
   use Koans
 
+  @intro "Maps"
+
   @person %{
     first_name: "Jon",
     last_name: "Snow",

lib/koans/08_structs.ex

@@ -1,6 +1,8 @@
 defmodule Structs do
   use Koans
 
+  @intro "Structs"
+
   defmodule Person do
     defstruct [:name, :age]
   end

lib/koans/09_pattern_matching.ex

@@ -1,6 +1,8 @@
 defmodule PatternMatching do
   use Koans
 
+  @intro "PatternMatching"
+
   koan "One matches one" do
     assert match?(1, ___)
   end

lib/koans/10_functions.ex

@@ -1,6 +1,8 @@
 defmodule Functions do
   use Koans
 
+  @intro "Functions"
+
   def greet(name) do
     "Hello, #{name}!"
   end

lib/koans/11_enums.ex

@@ -1,6 +1,8 @@
 defmodule Enums do
   use Koans
 
+  @intro "Enums"
+
   koan "Knowing how many elements are in a list is important for book-keeping" do
     assert Enum.count([1, 2, 3]) == ___
   end

lib/koans/12_processes.ex

@@ -1,6 +1,8 @@
 defmodule Processes do
   use Koans
 
+  @intro "Processes"
+
   koan "You are a process" do
     assert Process.alive?(self) == ___
   end

lib/koans/13_tasks.ex

@@ -1,6 +1,8 @@
 defmodule Tasks do
   use Koans
 
+  @intro "Tasks"
+
   koan "Tasks can be used for asynchronous computations with results" do
     task = Task.async(fn -> 3 * 3 end)
     do_other_stuff()

lib/koans/14_agents.ex

@@ -1,6 +1,8 @@
 defmodule Agents do
   use Koans
 
+  @intro "Agents"
+
   koan "Agents maintain state, so you can ask them about it" do
     {:ok, pid} = Agent.start_link(fn -> "Hi there" end)
     assert Agent.get(pid, &(&1)) == ___

test/executor_test.exs

@@ -12,6 +12,6 @@ defmodule ExecuteTest do
   end
 
   test "can access intro" do
-    assert SampleKoan.intro == "There is something"
+    assert SampleKoan.intro == "There is something\n"
   end
 end

test/support/passing_koan.ex

@@ -1,6 +1,8 @@
 defmodule PassingKoan do
   use Koans
 
+  @intro "something"
+
   koan "Hi there" do
     assert 1 == 1
   end