Picocli:如何始终显示标题/横幅

• 如何从应用程序中获取横幅文本?

您可以从用法帮助消息中获取横幅,也可以使用 new CommandLine(new App()).getCommandSpec().usageHelpMessage().header() @Spec 注释 CommandSpec 应用程序中的字段。

CommandLine.Help.Ansi.AUTO.string(line) 对于每条横幅线。

综合起来:

@Command(name = "git-star", header = {
        "@|green       _ _      _             |@", 
        "@|green  __ _(_) |_ __| |_ __ _ _ _  |@",
        "@|green / _` | |  _(_-<  _/ _` | '_| |@",
        "@|green \\__, |_|\\__/__/\\__\\__,_|_|   |@",
        "@|green |___/                        |@"},
        description = "Shows GitHub stars for a project",
        mixinStandardHelpOptions = true, version = "git-star 0.1")
class GitStar implements Runnable {

  @Option(names = "-c")
  int count;

  @Spec CommandSpec spec;

  // prints banner every time the command is invoked
  public void run() {

    String[] banner = spec.usageHelpMessage().header();

    // or: String[] banner = new CommandLine(new GitStar())
    //        .getCommandSpec().usageHelpMessage().header();

    for (String line : banner) {
      System.out.println(CommandLine.Help.Ansi.AUTO.string(line));
    }

    // business logic here...
  }

  public static void main(String[] args) {
    CommandLine.run(new GitStar(), args);
  }
}

public void run() {
    CommandLine cmd = new CommandLine(new App());
    cmd.usage(System.out, Ansi.ON);

    // business logic here...
}