feat: improved loading and saving logic, made Json loader ignore unknown keys

Signed-off-by: moonleay <contact@moonleay.net>

src/main/java/net/moonleay/gimbal/client/config/ClientConfigHolder.kt

@@ -30,42 +30,48 @@ class ClientConfigHolder(private val path: Path) {
         private set
 
     init {
-        config = load()
+        this.config = load()
     }
 
     fun updateConfig(new: GimbalClientConfig) {
-        config = new
-        save(config)
+        this.config = new
+        this.save(config)
     }
 
     @OptIn(ExperimentalSerializationApi::class)
     fun load(): GimbalClientConfig {
         if (!path.isReadable())
             save(GimbalClientConfig())
-        return path.inputStream().use {
-            Json.decodeFromStream(it)
+        val iStream = path.inputStream()
+        val gimbalClientConfig: GimbalClientConfig = iStream.use {
+            Json {
+                ignoreUnknownKeys = true
+            }.decodeFromStream<GimbalClientConfig>(it)
         }
+        iStream.close()
+        return gimbalClientConfig
     }
 
-    // TODO: Support incomplete config files
     @OptIn(ExperimentalSerializationApi::class)
     fun save(conf: GimbalClientConfig) {
+        if (!path.parent.exists()) {
+            path.parent.createDirectory()
+        }
+        if (!path.parent.isWritable()) {
+            throw Exception("Parent of path ${path.parent.pathString} is not writable.")
+        }
+        if (!path.exists())
+            path.createFile()
         if (!path.isWritable()) {
-            if (!path.parent.exists()) {
-                path.parent.createDirectory()
-            }
-            if (!path.parent.isWritable()) {
-                throw Exception("Parent of path ${path.parent.pathString} is not writable.")
-            }
-            if (!path.exists())
-                path.createFile()
-            if (!path.isWritable()) {
-                throw Exception("Path (${path.pathString}) exists, but is not writable.")
-            }
+            throw Exception("Path (${path.pathString}) exists, but is not writable.")
         }
-        path.outputStream().use {
-            Json.encodeToStream(conf, it)
+        val oStream = path.outputStream()
+        oStream.use {
+            Json {
+                ignoreUnknownKeys = true
+            }.encodeToStream<GimbalClientConfig>(conf, it)
         }
+        oStream.close()
     }
 
 }