Use EDoc link for erlang type

lib/ex_doc/formatter/html/autolink.ex

@@ -285,7 +285,17 @@ defmodule ExDoc.Formatter.HTML.Autolink do
 
   defp type_remote_url(source, alias, name, args) do
     name = enc("#{name}")
-    "#{source}#{enc(inspect(alias))}.html#t:#{name}/#{length(args)}"
+
+    if erlang_alias?(alias) do
+      "#{source}#{enc(to_string(alias))}.html#type-#{name}"
+    else
+      "#{source}#{enc(inspect(alias))}.html#t:#{name}/#{length(args)}"
+    end
+  end
+
+  defp erlang_alias?(alias) do
+    first_char = alias |> to_string() |> String.at(0)
+    first_char == String.downcase(first_char)
   end
 
   defp typespec_string_to_link(string, url) do

test/ex_doc/formatter/html/autolink_test.exs

@@ -542,11 +542,16 @@ defmodule ExDoc.Formatter.HTML.AutolinkTest do
                ~s[<a href=\"#{@erlang_docs}sets.html#type-set\">:sets.set</a>(<a href=\"#t:foo/0\">foo</a>())]
     end
 
-    test "autolinks shared aliases" do
+    test "autolinks shared Elixir aliases for ex_doc" do
       assert Autolink.typespec(quote(do: Foo.t()), [], [Foo]) ==
                ~s[<a href="Foo.html#t:t/0">Foo.t</a>()]
     end
 
+    test "autolinks shared Erlang aliases for EDoc" do
+      assert Autolink.typespec(quote(do: :foo.t()), [], [:foo]) ==
+               ~s[<a href="foo.html#type-t">:foo.t</a>()]
+    end
+
     test "autolinks inside parameterized types" do
       assert Autolink.typespec(quote(do: t(foo())), [t: 1, foo: 0], []) ==
                ~s[<a href="#t:t/1">t</a>(<a href="#t:foo/0">foo</a>())]