Add support for h AnyModule.__info__. Closes #1230

Author: alco

lib/iex/lib/iex/helpers.ex

@@ -99,12 +99,26 @@ defmodule IEx.Helpers do
       h Enum.all?/2
       h Enum.all?
   """
+  # Special case for `h AnyModule.__info__/1`
+  defmacro h({ :/, _, [{ { :., _, [_mod, :__info__] }, _, [] }, 1] }) do
+    quote do
+      IEx.Introspection.h(Module, :__info__, 1)
+    end
+  end
+
   defmacro h({ :/, _, [{ { :., _, [mod, fun] }, _, [] }, arity] }) do
     quote do
       IEx.Introspection.h(unquote(mod), unquote(fun), unquote(arity))
     end
   end
 
+  # Special case for `h AnyModule.__info__`
+  defmacro h({ { :., _, [_mod, :__info__] }, _, [] }) do
+    quote do
+      IEx.Introspection.h(Module, :__info__, 1)
+    end
+  end
+
   defmacro h({ { :., _, [mod, fun] }, _, [] }) do
     quote do
       IEx.Introspection.h(unquote(mod), unquote(fun))

lib/iex/test/iex/helpers_test.exs

@@ -43,6 +43,13 @@ defmodule IEx.HelpersTest do
            == "* def pwd()\n\nPrints the current working directory.\n\n"
   end
 
+  test "h helper __info__" do
+    h_output_module = capture_io(fn -> h Module.__info__ end)
+    assert capture_io(fn -> h Module.UnlikelyTo.Exist.__info__ end) == h_output_module
+    assert capture_io(fn -> h Module.UnlikelyTo.Exist.__info__/1 end) == h_output_module
+    assert capture_io(fn -> h __info__ end) == "No docs for __info__ have been found\n"
+  end
+
   test "t helper" do
     assert capture_io(fn -> t ExUnit end) == "No types for ExUnit have been found\n"