Make clearing the screen the default

README.md

@@ -32,10 +32,10 @@ You should see the first failure. Open the corresponding file in your favourite
 and fill in the blanks to make the koans pass one by one.
 The autorunner will give you feedback each time you save.
 
-To make the autorunner less noisy, you can start the koans with
 
+If you want the autorunner to show you your previous results, run it with `--no-clear-screen`
 ```sh
-$ mix meditate --clear-screen
+$ mix meditate --no-clear-screen
 ```
 
 ### Contributing

lib/options.ex

@@ -1,6 +1,6 @@
 defmodule Options do
   @defaults %{
-    clear_screen: false,
+    clear_screen: true,
     initial_koan: Equalities,
   }
 
@@ -27,6 +27,6 @@ defmodule Options do
   end
 
   def parse_argument("--koan="<>module), do: %{ initial_koan: String.to_atom("Elixir."<> module)}
-  def parse_argument("--clear-screen"), do: %{ clear_screen: true}
+  def parse_argument("--no-clear-screen"), do: %{ clear_screen: false}
   def parse_argument(_), do: %{}
 end

test/options_test.exs

@@ -3,12 +3,12 @@ defmodule OptionTest do
 
   test "has default options" do
     Options.start([])
-    refute Options.clear_screen?
+    assert Options.clear_screen?
   end
 
   test "override clearing of screen" do
-    Options.start(["--clear-screen"])
-    assert Options.clear_screen?
+    Options.start(["--no-clear-screen"])
+    refute Options.clear_screen?
   end
 
   test "can target specifc koans" do
@@ -18,6 +18,6 @@ defmodule OptionTest do
 
   test "ignores unknown options" do
     Options.start(["--foo"])
-    refute Options.clear_screen?
+    assert Options.clear_screen?
   end
 end