CAMEL-19949: camel-jbang - Allow to set a custom remote debugging port

dsl/camel-jbang/camel-jbang-core/src/main/java/org/apache/camel/dsl/jbang/core/commands/Run.java

@@ -16,7 +16,7 @@
  */
 package org.apache.camel.dsl.jbang.core.commands;
 
-import java.awt.*;
+import java.awt.Toolkit;
 import java.awt.datatransfer.Clipboard;
 import java.awt.datatransfer.DataFlavor;
 import java.awt.datatransfer.UnsupportedFlavorException;
@@ -166,8 +166,10 @@ public class Run extends CamelCommand {
             description = "Whether to allow automatic downloading JAR dependencies (over the internet)")
     boolean download = true;
 
-    @Option(names = { "--jvm-debug" }, defaultValue = "false", description = "To enable JVM remote debug on localhost:4004")
-    boolean jvmDebug;
+    @Option(names = { "--jvm-debug" }, parameterConsumer = DebugConsumer.class, paramLabel = "<true|false|port>",
+            description = "To enable JVM remote debugging on port 4004 by default. The supported values are true to " +
+                          "enable the remote debugging, false to disable the remote debugging or a number to use a custom port")
+    int jvmDebugPort;
 
     @Option(names = { "--name" }, defaultValue = "CamelJBang", description = "The name of the Camel application")
     String name;
@@ -300,6 +302,10 @@ protected Integer runScript(String file) throws Exception {
         return run();
     }
 
+    private boolean isDebugMode() {
+        return jvmDebugPort > 0;
+    }
+
     private void writeSetting(KameletMain main, Properties existing, String key, String value) {
         String val = existing != null ? existing.getProperty(key, value) : value;
         if (val != null) {
@@ -707,7 +713,7 @@ private int run() throws Exception {
         }
 
         // okay we have validated all input and are ready to run
-        if (camelVersion != null || jvmDebug) {
+        if (camelVersion != null || isDebugMode()) {
             boolean custom = false;
             if (camelVersion != null) {
                 // run in another JVM with different camel version (foreground or background)
@@ -794,7 +800,7 @@ private Properties loadProfileProperties() throws Exception {
             openapi = answer.getProperty("camel.jbang.open-api", openapi);
             download = "true".equals(answer.getProperty("camel.jbang.download", download ? "true" : "false"));
             background = "true".equals(answer.getProperty("camel.jbang.background", background ? "true" : "false"));
-            jvmDebug = "true".equals(answer.getProperty("camel.jbang.jvmDebug", jvmDebug ? "true" : "false"));
+            jvmDebugPort = parseJvmDebugPort(answer.getProperty("camel.jbang.jvmDebug", Integer.toString(jvmDebugPort)));
             camelVersion = answer.getProperty("camel.jbang.camel-version", camelVersion);
             kameletsVersion = answer.getProperty("camel.jbang.kameletsVersion", kameletsVersion);
             gav = answer.getProperty("camel.jbang.gav", gav);
@@ -808,6 +814,27 @@ private Properties loadProfileProperties() throws Exception {
         return answer;
     }
 
+    /**
+     * Parses the JVM debug port from the given value.
+     * <p/>
+     * The value can be {@code true} to indicate a default port which is {@code 4004}, {@code false} to indicate no
+     * debug, or a number corresponding to a custom port.
+     *
+     * @param  value the value to parse.
+     *
+     * @return       the JVM debug port corresponding to the given value.
+     */
+    private static int parseJvmDebugPort(String value) {
+        if (value == null) {
+            return 0;
+        } else if (value.equalsIgnoreCase("true")) {
+            return 4004;
+        } else if (value.equalsIgnoreCase("false")) {
+            return 0;
+        }
+        return Integer.parseInt(value);
+    }
+
     protected int runCamelVersion(KameletMain main) throws Exception {
         List<String> cmds = new ArrayList<>(spec.commandLine().getParseResult().originalArgs());
 
@@ -831,9 +858,9 @@ protected int runCamelVersion(KameletMain main) throws Exception {
         if (kameletsVersion != null) {
             jbangArgs.add("-Dcamel-kamelets.version=" + kameletsVersion);
         }
-        if (jvmDebug) {
-            jbangArgs.add("--debug"); // jbang --debug
-            cmds.remove("--jvm-debug");
+        if (isDebugMode()) {
+            jbangArgs.add("--debug=" + jvmDebugPort); // jbang --debug=port
+            cmds.removeIf(arg -> arg.startsWith("--jvm-debug"));
         }
 
         if (repos != null) {
@@ -1375,4 +1402,10 @@ protected void doConsumeParameters(Stack<String> args, Run cmd) {
         }
     }
 
+    static class DebugConsumer extends ParameterConsumer<Run> {
+        @Override
+        protected void doConsumeParameters(Stack<String> args, Run cmd) {
+            cmd.jvmDebugPort = parseJvmDebugPort(args.pop());
+        }
+    }
 }