Fix discarded output of commands executed from within a script

Resolve #1270

Signed-off-by: czpilar <david@czpilar.net>

Author: czpilar

spring-shell-core/src/main/java/org/springframework/shell/core/NonInteractiveShellRunner.java

@@ -49,7 +49,7 @@ public class NonInteractiveShellRunner implements ShellRunner {
 	private final CommandRegistry commandRegistry;
 
 	// Use a no-op PrintWriter since output is not needed in non-interactive mode
-	private final PrintWriter outputWriter = new PrintWriter(PrintWriter.nullWriter());
+	private PrintWriter outputWriter = new PrintWriter(PrintWriter.nullWriter());
 
 	// Use a no-op InputReader since input is not needed in non-interactive mode
 	private final InputReader inputReader = new InputReader() {
@@ -66,6 +66,19 @@ public NonInteractiveShellRunner(CommandParser commandParser, CommandRegistry co
 		this.commandExecutor = new CommandExecutor(commandRegistry);
 	}
 
+	/**
+	 * Create a new {@link NonInteractiveShellRunner} instance.
+	 * @param commandParser the command parser
+	 * @param commandRegistry the command registry
+	 * @param outputWriter the output writer
+	 * @since 4.0.1
+	 */
+	public NonInteractiveShellRunner(CommandParser commandParser, CommandRegistry commandRegistry,
+			PrintWriter outputWriter) {
+		this(commandParser, commandRegistry);
+		this.outputWriter = outputWriter;
+	}
+
 	@Override
 	public void run(String[] args) throws Exception {
 		if (ObjectUtils.isEmpty(args)) {

spring-shell-core/src/main/java/org/springframework/shell/core/command/Script.java

@@ -63,7 +63,7 @@ public ExitStatus execute(CommandContext commandContext) throws Exception {
 	private void executeCommand(CommandContext commandContext, String input) throws Exception {
 		String[] commandTokens = input.split(" ");
 		NonInteractiveShellRunner shellRunner = new NonInteractiveShellRunner(this.commandParser,
-				commandContext.commandRegistry());
+				commandContext.commandRegistry(), commandContext.outputWriter());
 		shellRunner.run(commandTokens);
 	}