From 3d85f9ec12ecdc9ce9e8ba06f616276e6c0867a1 Mon Sep 17 00:00:00 2001
From: JFronny <git@akbvopenfl1.hopto.org>
Date: Sun, 7 Jul 2024 16:16:00 +0200
Subject: [PATCH] feat(gtk): redirect GTK logs through our custom logger

---
 .../io/gitlab/jfronny/inceptum/gtk/GtkMain.kt |  2 ++
 .../gitlab/jfronny/inceptum/gtk/util/Log.kt   | 33 ++++++++++++++++++-
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/GtkMain.kt b/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/GtkMain.kt
index 70e1634..5c8b7d8 100644
--- a/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/GtkMain.kt
+++ b/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/GtkMain.kt
@@ -2,6 +2,7 @@ package io.gitlab.jfronny.inceptum.gtk
 
 import io.gitlab.jfronny.inceptum.common.BuildMetadata
 import io.gitlab.jfronny.inceptum.common.MetaHolder
+import io.gitlab.jfronny.inceptum.gtk.util.GtkLog
 import io.gitlab.jfronny.inceptum.gtk.util.Log
 import io.gitlab.jfronny.inceptum.gtk.window.MainWindow
 import io.gitlab.jfronny.inceptum.launcher.LauncherEnv
@@ -19,6 +20,7 @@ object GtkMain {
     @Throws(IOException::class)
     @JvmStatic
     fun main(args: Array<String>) {
+        GLib.logSetWriterFunc(GtkLog)
         LauncherEnv.initialize(GtkEnvBackend)
         Log.info("Launching Inceptum v" + BuildMetadata.VERSION)
         Log.info("Loading from " + MetaHolder.BASE_PATH)
diff --git a/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/util/Log.kt b/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/util/Log.kt
index e9832bf..e349de9 100644
--- a/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/util/Log.kt
+++ b/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/util/Log.kt
@@ -2,5 +2,36 @@ package io.gitlab.jfronny.inceptum.gtk.util
 
 import io.gitlab.jfronny.commons.logger.SystemLoggerPlus
 import io.gitlab.jfronny.inceptum.common.Utils
+import org.gnome.glib.LogField
+import org.gnome.glib.LogLevelFlags
+import org.gnome.glib.LogWriterFunc
+import org.gnome.glib.LogWriterOutput
 
-object Log : SystemLoggerPlus by Utils.LOGGER
\ No newline at end of file
+object Log : SystemLoggerPlus by Utils.LOGGER
+object GtkLog : LogWriterFunc {
+    // Based on https://github.com/jwharm/java-gi-examples/blob/6e08b4d2e62998c53d855b32433513308e01e82d/Logging/src/main/java/io/github/jwharm/javagi/examples/logging/SLF4JLogWriterFunc.java
+    // Original license: LGPL-2.1, written by Jan-Willem Harmannij
+    override fun run(logLevel: Set<LogLevelFlags>, fields: Array<LogField>): LogWriterOutput {
+        val level = logLevel.firstOrNull()?.let { convertLevel(it) } ?: return LogWriterOutput.UNHANDLED
+        val domain = readStringFromKey("GLIB_DOMAIN", fields) ?: return LogWriterOutput.UNHANDLED
+        val message = readStringFromKey("MESSAGE", fields) ?: return LogWriterOutput.UNHANDLED
+        val source = readStringFromKey("CODE_FILE", fields) ?: "<unknown>"
+        val func = readStringFromKey("CODE_FUNC", fields)?.let { "::$it" } ?: ""
+        val line = readStringFromKey("CODE_LINE", fields)?.let { ":$it" } ?: ""
+        System.getLogger(domain).log(level, "$source$func$line: $message")
+        return LogWriterOutput.HANDLED
+    }
+
+    private fun convertLevel(flag: LogLevelFlags) = when (flag) {
+        LogLevelFlags.LEVEL_ERROR, LogLevelFlags.LEVEL_CRITICAL -> System.Logger.Level.ERROR
+        LogLevelFlags.LEVEL_WARNING -> System.Logger.Level.WARNING
+        LogLevelFlags.LEVEL_MESSAGE, LogLevelFlags.LEVEL_INFO -> System.Logger.Level.INFO
+        LogLevelFlags.LEVEL_DEBUG -> System.Logger.Level.DEBUG
+        else -> null
+    }
+    private fun readStringFromKey(key: String, logFields: Array<LogField>) = logFields.firstOrNull { it.readKey() == key }?.readString()
+    private fun LogField.readString(): String {
+        val length = readLength()
+        return readValue().reinterpret(if (length == -1L) Long.MAX_VALUE else length).getString(0)
+    }
+}
\ No newline at end of file