How do I set color of user input in Spring Shell 2?

Question

I have a similar question to: Commands color in spring shell 2 but I am more interested in how I can override the color of user input.

When I open my Spring Shell 2 application and start typing a command (before a command is executed), the text input is in red until I type a command that is valid, then the text turns a bold white color. Is there a way for me to override the red text input to be another color?

Answer 1

I was able to get the behavior I wanted by overriding the LineReader bean in org.springframework.shell.jline.JLineShellAutoConfiguration

@Bean
public LineReader lineReader() {
    LineReaderBuilder lineReaderBuilder = LineReaderBuilder.builder().terminal(this.terminal()).appName("Spring Shell").completer(this.completer()).history(this.history).highlighter(new Highlighter() {
        public AttributedString highlight(LineReader reader, String buffer) {
            int l = 0;
            String best = null;
            Iterator var5 = JLineShellAutoConfiguration.this.shell.listCommands().keySet().iterator();

            while(var5.hasNext()) {
                String command = (String)var5.next();
                if (buffer.startsWith(command) && command.length() > l) {
                    l = command.length();
                    best = command;
                }
            }

            if (best != null) {
                return (new AttributedStringBuilder(buffer.length())).append(best, AttributedStyle.BOLD).append(buffer.substring(l)).toAttributedString();
            } else {
                return new AttributedString(buffer, AttributedStyle.DEFAULT.foreground(1));
            }
        }
    }).parser(this.parser());
    LineReader lineReader = lineReaderBuilder.build();
    lineReader.unsetOpt(Option.INSERT_TAB);
    return lineReader;
}

In the 'if (best != null)' block, the if sets the text to bold when a candidate command is matched, where the else block sets the text to red.