Provide a simple RegistryImpl that can provide options from LineReader (

#1128)

console/src/main/java/org/jline/console/impl/SimpleSystemRegistryImpl.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2024, the original author(s).
+ *
+ * This software is distributable under the BSD license. See the terms of the
+ * BSD license in the documentation provided with this software.
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ */
+package org.jline.console.impl;
+
+import java.nio.file.Path;
+import java.util.function.Supplier;
+
+import org.jline.builtins.ConfigurationPath;
+import org.jline.reader.LineReader;
+import org.jline.reader.Parser;
+import org.jline.terminal.Terminal;
+
+/**
+ * Simple SystemRegistry which stores variables in the LineReader.
+ */
+public class SimpleSystemRegistryImpl extends SystemRegistryImpl {
+    private LineReader lineReader;
+
+    public SimpleSystemRegistryImpl(
+            Parser parser, Terminal terminal, Supplier<Path> workDir, ConfigurationPath configPath) {
+        super(parser, terminal, workDir, configPath);
+    }
+
+    public void setLineReader(LineReader lineReader) {
+        this.lineReader = lineReader;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public <T> T consoleOption(String name, T defVal) {
+        return (T) lineReader.getVariables().getOrDefault(name, defVal);
+    }
+
+    @Override
+    public void setConsoleOption(String name, Object value) {
+        lineReader.setVariable(name, value);
+    }
+}