Default the error_logger redirect to be on, log to the 'log' dir

README.org

@@ -64,8 +64,12 @@
 * Error logger integration
   Lager is also supplied with a error_logger handler module that translates
   traditional erlang error messages into a friendlier format and sends them into
-  lager itself to be treated like a regular lager log call. To enable this, set
-  the lager application variable `error_logger_redirect' to `true'.
+  lager itself to be treated like a regular lager log call. To disable this, set
+  the lager application variable `error_logger_redirect' to `false'.
+
+  The error_logger handler will also log more complete error messages (protected
+  with use of trunc_io) to a "crash log" which can be referred to for further
+  information.
 
 * Runtime loglevel changes
   You can change the log level of any lager backend at runtime by doing the

src/lager.erl

@@ -35,7 +35,7 @@ start_link() ->
     Handlers = case application:get_env(lager, handlers) of
         undefined ->
             [{lager_console_backend, [info]},
-                {lager_file_backend, [{"error.log", error}, {"console.log", info}]}];
+                {lager_file_backend, [{"log/error.log", error}, {"log/console.log", info}]}];
         {ok, Val} ->
             Val
     end,
@@ -45,7 +45,7 @@ start() ->
     Handlers = case application:get_env(lager, handlers) of
         undefined ->
             [{lager_console_backend, [info]},
-                {lager_file_backend, [{"error.log", error}, {"console.log", info}]}];
+                {lager_file_backend, [{"log/error.log", error}, {"log/console.log", info}]}];
         {ok, Val} ->
             Val
     end,
@@ -100,13 +100,13 @@ init([Handlers]) ->
     MinLog = minimum_log_level(get_log_levels()),
     lager_mochiglobal:put(loglevel, MinLog),
     case application:get_env(lager, error_logger_redirect) of
-        {ok, true} ->
+        {ok, false} ->
+            {ok, #state{}};
+        _ ->
             gen_event:add_sup_handler(error_logger, error_logger_lager_h, []),
             %% TODO allow user to whitelist handlers to not be removed
             [gen_event:delete_handler(error_logger, X, {stop_please, ?MODULE}) ||
                 X <- gen_event:which_handlers(error_logger) -- [error_logger_lager_h]],
-            {ok, #state{}};
-        _ ->
             {ok, #state{}}
     end.
 

test/lager_test_backend.erl

@@ -173,6 +173,7 @@ lager_test_() ->
 setup() ->
     application:load(lager),
     application:set_env(lager, handlers, [{?MODULE, [info]}]),
+    application:set_env(lager, error_logger_redirect, false),
     application:start(lager).
 
 cleanup(_) ->