Do not use unicode chars if ANSI is disabled

See #10481 (comment)

Author: josevalim

lib/elixir/lib/io/ansi/docs.ex

@@ -1,7 +1,8 @@
 defmodule IO.ANSI.Docs do
   @moduledoc false
 
-  @bullet_text "• "
+  @bullet_text_unicode "• "
+  @bullet_text_ascii "* "
   @bullets [?*, ?-, ?+]
   @spaces [" ", "\n", "\t"]
 
@@ -219,7 +220,10 @@ defmodule IO.ANSI.Docs do
   end
 
   defp traverse_erlang_html({:dt, _, entries}, indent, options) do
-    ["#{indent}  ", @bullet_text | handle_erlang_html_text(entries, indent <> "    ", options)]
+    [
+      "#{indent}  ",
+      bullet_text(options) | handle_erlang_html_text(entries, indent <> "    ", options)
+    ]
   end
 
   defp traverse_erlang_html({:dd, _, entries}, indent, options) do
@@ -240,7 +244,10 @@ defmodule IO.ANSI.Docs do
       end
     else
       for {:li, _, lines} <- entries do
-        ["#{indent}  ", @bullet_text | handle_erlang_html_text(lines, indent <> "    ", options)]
+        [
+          "#{indent}  ",
+          bullet_text(options) | handle_erlang_html_text(lines, indent <> "    ", options)
+        ]
       end
     end
   end
@@ -424,7 +431,7 @@ defmodule IO.ANSI.Docs do
     case stripped do
       <<bullet, ?\s, item::binary>> when bullet in @bullets ->
         write_text(text, indent, options)
-        process_list(@bullet_text, item, rest, count, indent, options)
+        process_list(bullet_text(options), item, rest, count, indent, options)
 
       <<d1, ?., ?\s, item::binary>> when d1 in ?0..?9 ->
         write_text(text, indent, options)
@@ -930,6 +937,10 @@ defmodule IO.ANSI.Docs do
     end
   end
 
+  defp bullet_text(options) do
+    if options[:enabled], do: @bullet_text_unicode, else: @bullet_text_ascii
+  end
+
   defp color(style, colors) do
     IO.ANSI.format_fragment(colors[style], colors[:enabled])
   end

lib/elixir/test/elixir/io/ansi/docs_test.exs

@@ -192,6 +192,11 @@ defmodule IO.ANSI.DocsTest do
       assert result == "  • one\n  • two\n  • three\n\e[0m"
     end
 
+    test "* list is converted without ansi" do
+      result = format_markdown("* one\n* two\n* three\n", enabled: false)
+      assert result == "  * one\n  * two\n  * three"
+    end
+
     test "* list surrounded by text is converted" do
       result = format_markdown("Count:\n\n* one\n* two\n* three\n\nDone")
       assert result == "Count:\n\e[0m\n  • one\n  • two\n  • three\n\e[0m\nDone\n\e[0m"