Dynamically add log files to monitor

apps/log_monitor/src/coordinator.erl

@@ -1,6 +1,8 @@
 -module(coordinator).
 -behaviour(supervisor).
--compile(export_all).
+
+-export([start_link/0]).
+-export([init/1]).
 
 start_link() ->
     supervisor:start_link(?MODULE, []).
@@ -12,14 +14,13 @@ init([]) ->
                      start => {mailer, start_link, []},
                      restart => permanent,
                      shutdown => 5000
-                   }] ++ monitors_child_specs(),
+                   },
+                  #{
+                     id => logfiles_sup,
+                     start => {logfiles_sup, start_link, []},
+                     restart => permanent,
+                     type => supervisor,
+                     shutdown => 5000
+                   }
+                 ],
     {ok, {SupFlags, ChildSpecs}}.
-
-monitors_child_specs() ->
-    {ok, Files} = application:get_env(log_monitor, logfiles),
-    [#{
-        id => list_to_atom(File),
-        start => {monitor, start_link, [File]},
-        restart => temporary,
-        shutdown => 5000
-      } || File <- Files].

apps/log_monitor/src/gatherer.erl

@@ -1,6 +1,9 @@
 -module(gatherer).
 -behaviour(gen_server).
--compile(export_all).
+
+-export([start_link/1, init/1, terminate/2]).
+-export([handle_info/2, handle_cast/2, handle_call/3]).
+-export([code_change/3]).
 
 start_link(File) ->
     gen_server:start_link(?MODULE, [File], []).

apps/log_monitor/src/logfiles_sup.erl

@@ -0,0 +1,25 @@
+-module(logfiles_sup).
+-behaviour(supervisor).
+
+-export([start_link/0]).
+-export([init/1]).
+
+start_link() ->
+    supervisor:start_link({local, logfiles_sup}, ?MODULE, []).
+
+init([]) ->
+    SupFlags = #{
+      strategy => simple_one_for_one,
+      intensity => 0,
+      period => 1
+     },
+    ChildSpecs = [#{
+                     id => monitor,
+                     start => {monitor, start_link, []},
+                     restart => temporary,
+                     shutdown => 5000
+                   }],
+    {ok, {SupFlags, ChildSpecs}}.
+
+%% Start monitor with:
+%% supervisor:start_child(logfiles_sup, "/tmp/lines.log")

apps/log_monitor/src/mailer.erl

@@ -1,6 +1,9 @@
 -module(mailer).
 -behaviour(gen_server).
--compile(export_all).
+
+-export([start_link/0, init/1, terminate/2]).
+-export([handle_info/2, handle_cast/2, handle_call/3]).
+-export([code_change/3]).
 
 start_link() ->
     gen_server:start_link(?MODULE, [], []).

apps/log_monitor/src/monitor.erl

@@ -1,6 +1,8 @@
 -module(monitor).
 -behaviour(supervisor).
--compile(export_all).
+
+-export([start_link/1]).
+-export([init/1]).
 
 start_link(File) ->
     supervisor:start_link(?MODULE, [File]).

apps/log_monitor/src/watcher.erl

@@ -1,6 +1,9 @@
 -module(watcher).
 -behaviour(gen_server).
--compile(export_all).
+
+-export([start_link/2, init/1, terminate/2]).
+-export([handle_info/2, handle_cast/2, handle_call/3]).
+-export([code_change/3]).
 
 start_link(SupPid, File) ->
     gen_server:start_link(?MODULE, [SupPid, File], []).

config/sys.config

@@ -1,7 +1,6 @@
 [
   { log_monitor, 
     [
-      {logfiles, ["/tmp/lines.log", "/tmp/lines2.log"]},
       {email_config,
         [
           {sender, "me@example.com"},