From 8421d5ce817bc201c5fa946baed205b596f498d6 Mon Sep 17 00:00:00 2001
From: Tristan Sloughter <t@crashfast.com>
Date: Sun, 20 Sep 2015 17:06:16 -0500
Subject: handle case that upgraded app no longer has .app.src file

---
 src/rebar_app_discover.erl |  3 ++-
 src/rebar_app_info.erl     |  4 ++++
 src/rebar_otp_app.erl      | 19 +++++++------------
 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/src/rebar_app_discover.erl b/src/rebar_app_discover.erl
index 4f7442b..67acf54 100644
--- a/src/rebar_app_discover.erl
+++ b/src/rebar_app_discover.erl
@@ -229,7 +229,8 @@ try_handle_app_file(AppInfo0, [File], AppDir, AppSrcFile, _, Validate) ->
                            [F] ->
                                rebar_app_info:app_file_src(AppInfo1, F);
                            [] ->
-                               AppInfo1;
+                               %% Set to undefined in case AppInfo previous had a .app.src
+                               rebar_app_info:app_file_src(AppInfo1, undefined);
                            Other when is_list(Other) ->
                                throw({error, {multiple_app_files, Other}})
                       end,
diff --git a/src/rebar_app_info.erl b/src/rebar_app_info.erl
index b41880e..bb9f7a4 100644
--- a/src/rebar_app_info.erl
+++ b/src/rebar_app_info.erl
@@ -232,6 +232,8 @@ app_file_src(#app_info_t{app_file_src=AppFileSrc}) ->
     ec_cnv:to_list(AppFileSrc).
 
 -spec app_file_src(t(), file:filename_all()) -> t().
+app_file_src(AppInfo=#app_info_t{}, undefined) ->
+    AppInfo#app_info_t{app_file_src=undefined};
 app_file_src(AppInfo=#app_info_t{}, AppFileSrc) ->
     AppInfo#app_info_t{app_file_src=ec_cnv:to_list(AppFileSrc)}.
 
@@ -248,6 +250,8 @@ app_file_src_script(#app_info_t{app_file_src_script=AppFileSrcScript}) ->
     ec_cnv:to_list(AppFileSrcScript).
 
 -spec app_file_src_script(t(), file:filename_all()) -> t().
+app_file_src_script(AppInfo=#app_info_t{}, undefined) ->
+    AppInfo#app_info_t{app_file_src_script=undefined};
 app_file_src_script(AppInfo=#app_info_t{}, AppFileSrcScript) ->
     AppInfo#app_info_t{app_file_src_script=ec_cnv:to_list(AppFileSrcScript)}.
 
diff --git a/src/rebar_otp_app.erl b/src/rebar_otp_app.erl
index c1d90bc..ddaa44b 100644
--- a/src/rebar_otp_app.erl
+++ b/src/rebar_otp_app.erl
@@ -60,7 +60,7 @@ compile(State, App) ->
 format_error({missing_app_file, Filename}) ->
     io_lib:format("App file is missing: ~s", [Filename]);
 format_error({file_read, File, Reason}) ->
-    io_lib:format("Failed to read app file ~s for processing: ~p", [File, file:format_error(Reason)]);
+    io_lib:format("Failed to read required file ~s for processing: ~s", [File, file:format_error(Reason)]);
 format_error({invalid_name, File, AppName}) ->
     io_lib:format("Invalid ~s: name of application (~p) must match filename.", [File, AppName]).
 
@@ -110,7 +110,7 @@ preprocess(State, AppInfo, AppSrcFile) ->
             A1 = apply_app_vars(AppVars, AppData),
 
             %% AppSrcFile may contain instructions for generating a vsn number
-            Vsn = app_vsn(AppSrcFile, State),
+            Vsn = app_vsn(AppData, AppSrcFile, State),
             A2 = lists:keystore(vsn, 1, A1, {vsn, Vsn}),
 
             %% systools:make_relup/4 fails with {missing_param, registered}
@@ -128,7 +128,7 @@ preprocess(State, AppInfo, AppSrcFile) ->
 
             AppFile;
         {error, Reason} ->
-            ?PRV_ERROR({file_read, AppSrcFile, Reason})
+            throw(?PRV_ERROR({file_read, AppSrcFile, Reason}))
     end.
 
 load_app_vars(State) ->
@@ -214,15 +214,10 @@ consult_app_file(Filename) ->
             end
     end.
 
-app_vsn(AppFile, State) ->
-    case consult_app_file(AppFile) of
-        {ok, [{application, _AppName, AppData}]} ->
-            AppDir = filename:dirname(filename:dirname(AppFile)),
-            Resources = rebar_state:resources(State),
-            rebar_utils:vcs_vsn(get_value(vsn, AppData, AppFile), AppDir, Resources);
-        {error, Reason} ->
-            throw(?PRV_ERROR({file_read, AppFile, Reason}))
-    end.
+app_vsn(AppData, AppFile, State) ->
+    AppDir = filename:dirname(filename:dirname(AppFile)),
+    Resources = rebar_state:resources(State),
+    rebar_utils:vcs_vsn(get_value(vsn, AppData, AppFile), AppDir, Resources).
 
 get_value(Key, AppInfo, AppFile) ->
     case proplists:get_value(Key, AppInfo) of
-- 
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