don't unescessarily recompile yrl/xrl files

fixes #175

1 files changed, 10 insertions, 4 deletions

diff --git a/src/rebar_erlc_compiler.erl b/src/rebar_erlc_compiler.erl
index afdd6bd..ce15ab0 100644
--- a/src/rebar_erlc_compiler.erl
+++ b/src/rebar_erlc_compiler.erl
@@ -265,14 +265,20 @@ opts_changed(Opts, Target) ->
     case code:load_abs(ObjectFile) of
         {module, Mod} ->
             Compile = Mod:module_info(compile),
-            %% dialyzer and eunit have trouble without the next two lines
-            code:delete(Mod),
-            code:purge(Mod),
+            _ = purge(Mod),
             lists:sort(Opts) =/= lists:sort(proplists:get_value(options,
                                                                 Compile));
-        {error, _} -> true
+        {error, nofile} -> false
     end.
 
+purge(Mod) ->
+    %% remove old code if necessary
+    _ = code:purge(Mod),
+    %% move current code to old
+    true = code:delete(Mod),
+    %% remove new old code
+    _ = code:purge(Mod).
+
 check_erlcinfo(_Config, #erlcinfo{vsn=?ERLCINFO_VSN}) ->
     ok;
 check_erlcinfo(Config, #erlcinfo{vsn=Vsn}) ->