detect journald, parse some env options

bin/main.ml

@@ -1,12 +1,50 @@
-Logging.init_pretty_writer stderr
-  ~min_level:TRACE;
+let min_level =
+  match Sys.getenv_opt "LOG_LEVEL" |> Option.map String.uppercase_ascii with
+  | Some "TRACE" -> Logging.TRACE
+  | Some "DEBUG" -> Logging.TRACE
+  | Some "INFO" -> Logging.TRACE
+  | Some ("WARN" | "WARNING") -> Logging.TRACE
+  | Some ("ERR" | "ERROR") -> Logging.TRACE
+  | _ -> Logging.INFO
 
-Lwt_main.run
-  (Server.run {
-      port = 6667;
-      listen_backlog = 8;
-      ping_interval = 60;
-      whowas_history_len = 1000;
-      hostname = "irc.tali.software";
-      (* TODO: motd *)
-    })
+let no_color = Option.is_some (Sys.getenv_opt "LOG_NO_COLOR")
+let no_timestamp = Option.is_some (Sys.getenv_opt "LOG_NO_TIMESTAMP")
+let no_namespace = Option.is_some (Sys.getenv_opt "LOG_NO_NAMESPACE")
+
+let () =
+  match Sys.getenv_opt "JOURNAL_STREAM" with
+  | Some _ ->
+    Logging.init_journald_writer ()
+      ~min_level
+  | None ->
+    Logging.init_pretty_writer stderr
+      ~min_level
+      ~color:(not no_color)
+      ~timestamp:(not no_timestamp)
+      ~namespace:(not no_namespace)
+
+let port =
+  try
+    let port = int_of_string (Sys.getenv "IRC_PORT") in
+    if port <= 0 || port > 65535 then failwith "invalid port";
+    port
+  with _ ->
+    6667
+
+let hostname =
+  match Sys.getenv_opt "IRC_HOSTNAME" with
+  | Some x -> x
+  | None -> "irc.tali.software"
+
+let config : Server.config = {
+  port;
+  hostname;
+  listen_backlog = 8;
+  ping_interval = 60;
+  whowas_history_len = 1000;
+
+  (* TODO: motd *)
+}
+
+let () =
+  Lwt_main.run @@ Server.run config