在Groovy中使用Picocli创建CLI工具

Question

我正在使用Picocli和Groovy来创建一个CLI工具，我遵循了下面的示例：https://picocli.info/picocli-2.0-groovy-scripts-on-steroids.html

这个例子运行得很好。但是在Groovy中无法获得多个子命令的简单工作示例。我想从jar执行它，如下所示: java -jar picapp -count次数java -jar picapp -namesList of name/s

所以：

java -jar picapp count 3 
outputs: 
hi, hi , hi

java -jar picapp names bob john
outputs:
hi bob
hi john

我猜我正在尝试以this格式实现该功能：https://github.com/remkop/picocli/blob/master/picocli-examples/src/main/java/picocli/examples/subcommands/SubCmdsViaMethods.java

下面的Groovy代码无法编译：

@Grab('info.picocli:picocli:2.0.3')
import picocli.CommandLine;
import picocli.CommandLine.Command;
import picocli.CommandLine.Model.CommandSpec;
import picocli.CommandLine.Parameters;
import picocli.CommandLine.ParameterException;
import picocli.CommandLine.Spec;
import java.util.Locale;
@Command(name = "hi", subcommands = { CommandLine.HelpCommand.class },
        description = "hi")

public class picapp implements Runnable {

    @Command(name = "count", description = "count")
    void country(@Parameters(arity = "1..*", paramLabel = "count",
            description = "count") int count) {
        count.times {
            println("hi $it...")
        }
    }
    @Command(name = "names", description = "names")
    void language(@Parameters(arity = "1..*", paramLabel = "names",
            description = "name") String[] names) {
        println 'CmdLineTool says \n\tWelcome:'
        names.each {
            println '\t\t' + it
        }
    }

    @Override
    public void run() {
        throw new ParameterException(spec.commandLine(), "Specify a subcommand");
    }

    public static void main(String[] args) {
        CommandLine cmd = new CommandLine(new SubCmdsViaMethods());
        if (args.length == 0) {
            cmd.usage(System.out);
        }
        else {
            cmd.execute(args);
        }
    }
}

Answer 1

问题是picocli版本2.0.3是旧的，不支持execute方法。在picocli 4.0中引入了execute方法。

建议始终使用最新的picocli版本。(考虑使用dependabot等工具自动升级。)