Get rid of unnecessary supplier.

src/main/java/org/nwapw/abacus/Abacus.java

@@ -12,8 +12,6 @@ import org.nwapw.abacus.plugin.StandardPlugin;
 import org.nwapw.abacus.tree.NumberReducer;
 import org.nwapw.abacus.tree.TreeNode;
 
-import java.util.function.Supplier;
-
 /**
  * The main calculator class. This is responsible
  * for piecing together all of the components, allowing
@@ -49,10 +47,10 @@ public class Abacus {
     /**
      * Creates a new instance of the Abacus calculator.
      */
-    public Abacus(Supplier<Configuration> configurationSupplier) {
+    public Abacus(Configuration configuration) {
         pluginManager = new PluginManager(this);
         numberReducer = new NumberReducer(this);
-        configuration = configurationSupplier.get();
+        this.configuration = new Configuration(configuration);
         LexerTokenizer lexerTokenizer = new LexerTokenizer();
         ShuntingYardParser shuntingYardParser = new ShuntingYardParser(this);
         treeBuilder = new TreeBuilder<>(lexerTokenizer, shuntingYardParser);

src/main/java/org/nwapw/abacus/config/Configuration.java

@@ -39,6 +39,15 @@ public class Configuration {
      */
     private Set<String> disabledPlugins = new HashSet<>();
 
+    /**
+     * Creates a new configuration form the given configuration.
+     *
+     * @param copyFrom the configuration to copy.
+     */
+    public Configuration(Configuration copyFrom){
+        copyFrom(copyFrom);
+    }
+
     /**
      * Creates a new configuration with the given values.
      *

src/main/java/org/nwapw/abacus/fx/AbacusController.java

@@ -180,7 +180,7 @@ public class AbacusController implements PluginListener {
             if (oldValue.equals(settingsTab)) alertIfApplyNeeded(true);
         });
 
-        abacus = new Abacus(() -> new Configuration(new java.io.File("config.toml")));
+        abacus = new Abacus(new Configuration(CONFIG_FILE));
         PluginManager abacusPluginManager = abacus.getPluginManager();
         abacusPluginManager.addListener(this);
         abacusPluginManager.addInstantiated(new StandardPlugin(abacus.getPluginManager()));