From fe034b04f75a70a3b79061e14178fe00d5064822 Mon Sep 17 00:00:00 2001
From: Jesper Alf Dam <jalf@karoshealth.com>
Date: Fri, 25 Nov 2016 10:11:54 +0100
Subject: [PATCH] Make logger output configurable

init_logging can now optionally be called with an object containing
custom handlers for log messages.

This allows clients to use their own logging frameworks instead of log
messages always just being written to the console.
---
 core/util/logging.js | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/core/util/logging.js b/core/util/logging.js
index 8978a075..a163553a 100644
--- a/core/util/logging.js
+++ b/core/util/logging.js
@@ -17,18 +17,28 @@ let Info = () => {};
 let Warn = () => {};
 let Error = () => {};
 
-export function init_logging(level) {
-    if (typeof level === 'undefined') {
-        level = _log_level;
-    } else {
-        _log_level = level;
+export function init_logging(param) {
+    Debug = Info = Warn = Error = () => {};
+    let has_custom_logger = false;
+    switch (typeof param) {
+        case 'string':
+            _log_level = param;
+            break;
+        case 'object':
+            let has_custom_logger = true;
+            if ('level' in param) {
+                _log_level = param.level;
+            }
+            if ('debug' in param) { Debug = param.debug; }
+            if ('info' in param) { Info = param.info; }
+            if ('warn' in param) { Warn = param.warn; }
+            if ('error' in param) { Error = param.error; }
+            break;
     }
 
-    Debug = Info = Warn = Error = () => {};
-
-    if (typeof window.console !== "undefined") {
+    if (!has_custom_logger && typeof window.console !== "undefined") {
         /* eslint-disable no-console, no-fallthrough */
-        switch (level) {
+        switch (_log_level) {
             case 'debug':
                 Debug = console.debug.bind(window.console);
             case 'info':