Add basic linting for .app file

src/rebar_app_utils.erl

@@ -100,6 +100,7 @@ validate_application_info(AppInfo, AppDetail) ->
         undefined ->
             false;
         AppFile ->
+            lint_detail(AppDetail, AppFile),
             case proplists:get_value(modules, AppDetail) of
                 undefined ->
                     ?PRV_ERROR({module_list, AppFile});
@@ -108,6 +109,36 @@ validate_application_info(AppInfo, AppDetail) ->
             end
     end.
 
+-spec lint_detail(list(), file:filename_all()) -> ok.
+lint_detail(AppDetail, AppFile) ->
+    lint_description(AppDetail, AppFile),
+    lint_applications(AppDetail, AppFile).
+
+-spec lint_description(list(), file:filename_all()) -> ok.
+lint_description(AppDetail, AppFile) ->
+    case proplists:get_value(description, AppDetail, "") of
+        "" -> ?WARN("~p is missing description entry", [AppFile]);
+        _ -> ok
+    end.
+
+-spec lint_applications(list(), file:filename_all()) -> ok.
+lint_applications(AppDetail, AppFile) ->
+    case proplists:get_value(applications, AppDetail, []) of
+        [] -> ?WARN("~p is missing applications entry", [AppFile]);
+        AppList when is_list(AppList) ->
+            case lists:member(kernel, AppList) of
+                false ->
+                    ?WARN("~p is missing kernel from applications list", [AppFile]);
+                true -> ok
+            end,
+            case lists:member(stdlib, AppList) of
+                false ->
+                    ?WARN("~p is missing stdlib from applications list", [AppFile]);
+                true -> ok
+            end;
+        _ -> ?WARN("~p requires a list for applications key", [AppFile])
+    end.
+
 %% @doc parses all dependencies from the root of the project
 -spec parse_deps(Dir, Deps, State, Locks, Level) -> [rebar_app_info:t()] when
       Dir :: file:filename(),

test/rebar_compile_SUITE.erl

@@ -40,7 +40,9 @@ all() ->
      always_recompile_when_erl_compiler_options_set,
      dont_recompile_when_erl_compiler_options_env_does_not_change,
      recompile_when_erl_compiler_options_env_changes,
-     rebar_config_os_var].
+     rebar_config_os_var,
+
+     app_file_linting].
 
 groups() ->
     [{basic_app, [], [build_basic_app, paths_basic_app, clean_basic_app]},
@@ -431,7 +433,6 @@ paths_release_apps(Config) ->
     [Vsn1, Vsn2] = ?config(vsns, Config),
 
     {ok, State} = rebar_test_utils:run_and_check(Config, [], ["compile"], return),
-
     code:add_paths(rebar_state:code_paths(State, all_deps)),
     ok = application:load(list_to_atom(Name1)),
     ok = application:load(list_to_atom(Name2)),
@@ -2312,6 +2313,23 @@ regex_filter_regression(Config) ->
                                    {ok, [{file, Expected}]}),
     ok.
 
+app_file_linting(Config) ->
+    meck:new(rebar_log, [no_link, passthrough]),
+    AppDir = ?config(apps, Config),
+    Name = rebar_test_utils:create_random_name("app_file_linting"),
+    Vsn = rebar_test_utils:create_random_vsn(),
+    rebar_test_utils:create_app(AppDir, Name, Vsn, [foo]),
+
+    _ = rebar_test_utils:run_and_check(Config, [], ["compile"], return),
+    History = meck:history(rebar_log),
+    Warnings = [{Str, Args} || {_, {rebar_log, log, [warn, Str, Args]}, _} <- History],
+
+    ct:pal("Warnings Length: ~p", [length(Warnings)]),
+    ct:pal("Warnings: ~p", [Warnings]),
+    ?assert(none /= proplists:lookup("~p is missing description entry", Warnings)),
+    ?assert(none /= proplists:lookup("~p is missing kernel from applications list", Warnings)),
+    ?assert(none /= proplists:lookup("~p is missing stdlib from applications list", Warnings)).
+
 %%
 
 %% a copy of lib/parsetools/include/yeccpre.hrl so we can test yrl includefile