feat: demo subcommand

src/main/java/me/hatter/demo/PicocliCli.java

@@ -1,32 +1,26 @@
 package me.hatter.demo;
 
+import me.hatter.demo.commands.DemoSubCommand;
 import picocli.CommandLine;
 import picocli.CommandLine.Command;
 import picocli.CommandLine.Option;
-import picocli.CommandLine.Parameters;
+
 import java.io.File;
 
 @Command(name = "example",
         mixinStandardHelpOptions = true,
-        version = "Picocli example 1.0")
-public class PicocliCli {
+        version = "Picocli example 1.0",
+        subcommands = {
+                DemoSubCommand.class
+        })
+public class PicocliCli implements Runnable {
 
     @Option(names = {"-v", "--verbose"},
             description = "Verbose mode. Helpful for troubleshooting. Multiple -v options increase the verbosity.")
     private boolean[] verbose = new boolean[0];
 
-    @Parameters(arity = "1..*", paramLabel = "FILE", description = "File(s) to process.")
-    private File[] inputFiles;
-
     public void run() {
-        if (verbose.length > 0) {
-            System.out.println(inputFiles.length + " files to process...");
-        }
-        if (verbose.length > 1) {
-            for (File f : inputFiles) {
-                System.out.println(f.getAbsolutePath());
-            }
-        }
+        System.out.println("Use --help for help");
     }
 
     public static void main(String[] args) {

src/main/java/me/hatter/demo/commands/DemoSubCommand.java

@@ -0,0 +1,15 @@
+package me.hatter.demo.commands;
+
+import picocli.CommandLine;
+import picocli.CommandLine.Option;
+
+@CommandLine.Command(name = "demo", description = "Demo subcommand")
+public class DemoSubCommand implements Runnable {
+    @Option(names = {"-h", "--help"}, usageHelp = true, description = "Show this help message and exit.")//, hidden = true)
+    boolean helpRequested = false;
+
+    @Override
+    public void run() {
+        System.out.println("Subcommand demo.");
+    }
+}