use not over ! when rewriting unless a (> >= < <= in) b

lib/style/blocks.ex

@@ -328,12 +328,7 @@ defmodule Styler.Style.Blocks do
   defp invert({:===, m, [a, b]}), do: {:!==, m, [a, b]}
   defp invert({:!, _, [condition]}), do: condition
   defp invert({:not, _, [condition]}), do: condition
-
-  defp invert({fun, m, _} = ast) do
-    meta = [line: m[:line]]
-
-    if fun == :|>,
-      do: {:|>, meta, [ast, {{:., meta, [Kernel, :!]}, meta, []}]},
-      else: {:!, meta, [ast]}
-  end
+  defp invert({:|>, m, _} = ast), do: {:|>, m, [ast, {{:., m, [Kernel, :!]}, m, []}]}
+  defp invert({bool, m, [_, _]} = ast) when bool in ~w(> >= < <= in)a, do: {:not, m, [ast]}
+  defp invert({_, m, _} = ast), do: {:!, [line: m[:line]], [ast]}
 end

test/style/blocks_test.exs

@@ -934,6 +934,14 @@ defmodule Styler.Style.BlocksTest do
     test "unless with pipes" do
       assert_style "unless a |> b() |> c(), do: x", "if a |> b() |> c() |> Kernel.!(), do: x"
     end
+
+    test "kernel boolean operators" do
+      assert_style "unless a in b, do: x", "if a not in b, do: x"
+
+      for bool <- ~w(> >= < <=)a do
+        assert_style "unless a #{bool} b, do: x", "if not (a #{bool} b), do: x"
+      end
+    end
   end
 
   describe "if" do