From: Peter Lemenkov <lemenkov@gmail.com>
Date: Wed, 1 Jun 2016 17:25:30 +0300
Subject: [PATCH] Remove pre-18.0 code

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>

diff --git a/src/edown_doclet.erl b/src/edown_doclet.erl
index 762d342..b0ad8e9 100644
--- a/src/edown_doclet.erl
+++ b/src/edown_doclet.erl
@@ -123,7 +123,7 @@ gen(Sources, App, Modules, Ctxt) ->
         ++ lists:concat([modules_frame(Modules1) || Modules1 =/= []]),
     Text = edown_lib:export(Data, Options),
     write_file(Text, Dir, right_suffix(?INDEX_FILE, Options)),
-    write_info_file(App, Modules1, Dir),
+    edoc_lib:write_info_file(App, Modules1, Dir),
     copy_stylesheet(Dir, Options),
     copy_image(Dir, Options),
     make_top_level_README(Data, Options),
@@ -320,25 +320,7 @@ write_file(Text, Dir, F) ->
     write_file(Text, Dir, F, F, auto).
 
 write_file(Text, Dir, LastName, Name, Enc) ->
-    %% edoc_lib:write_file/5 (with encoding support) was added in OTP R16B
-    %% -- and removed in 18.0; we reuse the check to detect 18, since we don't
-    %% -- care about pre-R16
-    case lists:member({write_file,5}, edoc_lib:module_info(exports)) of
-        true ->
-            edoc_lib:write_file(Text, Dir, LastName, '',
-                                [{encoding, encoding(Enc, Name)}]);
-        false ->
-            edoc_lib:write_file(Text, Dir, LastName,
-				[{encoding, encoding(Enc, Name)}])
-    end.
-
-write_info_file(App, Modules, Dir) ->
-    case erlang:function_exported(edoc_lib, write_info_file, 4) of
-	true ->
-	    edoc_lib:write_info_file(App, [], Modules, Dir);
-	false ->
-	    edoc_lib:write_info_file(App, Modules, Dir)
-    end.
+    edoc_lib:write_file(Text, Dir, LastName, [{encoding, encoding(Enc, Name)}]).
 
 encoding(auto, Name) ->
     edoc_lib:read_encoding(Name, []);