refactor: revert changes of formatter module name

Author: yordis

lib/ex_doc.ex

@@ -35,16 +35,11 @@ defmodule ExDoc do
   end
 
   defp find_formatter(name) do
-    [ExDoc.Formatter, format_module_name(name)]
+    [ExDoc.Formatter, String.upcase(name)]
     |> Module.concat()
     |> check_formatter_module(name)
   end
 
-  defp format_module_name("html"), do: "HTML"
-  defp format_module_name("epub"), do: "EPUB"
-  defp format_module_name("markdown"), do: "Markdown"
-  defp format_module_name(name), do: String.upcase(name)
-
   defp check_formatter_module(modname, argname) do
     if Code.ensure_loaded?(modname) do
       modname

lib/ex_doc/formatter/epub.ex

@@ -51,7 +51,9 @@ defmodule ExDoc.Formatter.EPUB do
     module_files = generate_list(config, nodes_map.modules)
     task_files = generate_list(config, nodes_map.tasks)
 
-    all_files = List.flatten([content_files, nav_files, title_files, extra_files, module_files, task_files])
+    all_files =
+      List.flatten([content_files, nav_files, title_files, extra_files, module_files, task_files])
+
     generate_build(all_files, build)
 
     {:ok, epub} = generate_epub(config.output)

lib/ex_doc/formatter/markdown.ex

@@ -1,4 +1,4 @@
-defmodule ExDoc.Formatter.Markdown do
+defmodule ExDoc.Formatter.MARKDOWN do
   @moduledoc false
 
   alias __MODULE__.{Templates}

lib/ex_doc/formatter/markdown/templates.ex

@@ -1,4 +1,4 @@
-defmodule ExDoc.Formatter.Markdown.Templates do
+defmodule ExDoc.Formatter.MARKDOWN.Templates do
   @moduledoc false
 
   require EEx