StringInput better unicode handling

- Add unicode handling in flow components in
  AbstractTextComponent which allows StringInput
  to process unicode given from jline.
- This add basic non-english character support
  for input.
- Backport #1115
- Fixes #1117

Author: jvalkeal

spring-shell-core/src/main/java/org/springframework/shell/component/StringInput.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -94,6 +94,7 @@ protected boolean read(BindingReader bindingReader, KeyMap<String> keyMap, Strin
 		}
 		String input;
 		switch (operation) {
+			case OPERATION_UNICODE:
 			case OPERATION_CHAR:
 				String lastBinding = bindingReader.getLastBinding();
 				input = context.getInput();

spring-shell-core/src/main/java/org/springframework/shell/component/support/AbstractComponent.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -60,6 +60,7 @@ public abstract class AbstractComponent<T extends ComponentContext<T>> implement
 	public final static String OPERATION_EXIT = "EXIT";
 	public final static String OPERATION_BACKSPACE = "BACKSPACE";
 	public final static String OPERATION_CHAR = "CHAR";
+	public final static String OPERATION_UNICODE = "UNICODE";
 	public final static String OPERATION_SELECT = "SELECT";
 	public final static String OPERATION_DOWN = "DOWN";
 	public final static String OPERATION_UP = "UP";

spring-shell-core/src/main/java/org/springframework/shell/component/support/AbstractTextComponent.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -62,6 +62,7 @@ protected void bindKeyMap(KeyMap<String> keyMap) {
 		for (char i = 32; i < KeyMap.KEYMAP_LENGTH - 1; i++) {
 			keyMap.bind(OPERATION_CHAR, Character.toString(i));
 		}
+		keyMap.setUnicode(OPERATION_UNICODE);
 	}
 
 	@Override

spring-shell-core/src/test/java/org/springframework/shell/component/StringInputTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -166,6 +166,29 @@ public void testResultUserInput() throws InterruptedException {
 		assertThat(run1Context.getResultValue()).isEqualTo("test");
 	}
 
+	@Test
+	public void testResultUserInputUnicode() throws InterruptedException {
+		ComponentContext<?> empty = ComponentContext.empty();
+		StringInput component1 = new StringInput(getTerminal(), "component1", "component1ResultValue");
+		component1.setResourceLoader(new DefaultResourceLoader());
+		component1.setTemplateExecutor(getTemplateExecutor());
+
+		service.execute(() -> {
+			StringInputContext run1Context = component1.run(empty);
+			result1.set(run1Context);
+			latch1.countDown();
+		});
+
+		TestBuffer testBuffer = new TestBuffer().append("😂").cr();
+		write(testBuffer.getBytes());
+
+		latch1.await(2, TimeUnit.SECONDS);
+		StringInputContext run1Context = result1.get();
+
+		assertThat(run1Context).isNotNull();
+		assertThat(run1Context.getResultValue()).isEqualTo("😂");
+	}
+
 	@Test
 	public void testPassingViaContext() throws InterruptedException {
 		ComponentContext<?> empty = ComponentContext.empty();