jline keep prompt at the bottom

问题:

I am using jline and I have a neat ConsoleReader and everything works great. However, if you are typing something into the the prompt and there is output on stdout (from another thread), the output splits the word/command that you are typing.

How can I keep the jline prompt at the bottom of the terminal?

I am using jline 1, but I am open to using jline 2 if it is stable enough.

回答1:

Finally figured this out... here's what you do. First, define these functions:

private ConsoleReader console = ...;
private CursorBuffer stashed;

private void stashLine() {
    this.stashed = this.console.getCursorBuffer().copy();
    try {
        this.console.getOutput().write("\u001b[1G\u001b[K");
        this.console.flush();
    } catch (IOException e) {
        // ignore
    }
}

private void unstashLine() {
    try {
        this.console.resetPromptLine(this.console.getPrompt(),
          this.stashed.toString(), this.stashed.cursor);
    } catch (IOException e) {
        // ignore
    }
}

Then when you want to output new data, first invoke stashLine() to save the current console input, then output whatever new lines of output, then invoke unstashLine() to restore it.