fix: stop must be call to get results when no duration is asked

Fixes #2

README.md

@@ -26,4 +26,8 @@ To use the extension:
 4. Start your application in dev mode: `quarkus dev`
 5. Enter the dev mode terminal by pressing `:` (column)
 6. You should have a new `power` command available, type `power --help` for more information
-7. You can start power measurement with `power start` and stop it with `power stop`
+7. You can start power measurement with `power start` and stop it with `power stop`, at which time the power consumption
+   of your app will be displayed.
+8. You can also ask for power to be measured for a given duration by using the `--duration` option when
+   calling `power start`. In this case, there's no need to call `power stop`, the energy consumed during the specified
+   time will be automatically displayed once the time period is elapsed.

deployment/src/main/java/io/quarkiverse/power/deployment/devui/commands/StartCommand.java

@@ -28,7 +28,7 @@ public CommandResult execute(CommandInvocation commandInvocation) {
             if (duration > 0) {
                 commandInvocation.println("Measuring power for " + duration + " seconds, every " + frequency + " milliseconds");
             } else {
-                commandInvocation.println("Measuring power until 'stop' is called, every " + frequency + " milliseconds");
+                commandInvocation.println("Measuring power every " + frequency + " milliseconds. Execute 'power stop' to stop measurements and get the results.");
             }
             sensor.start(duration, frequency, commandInvocation::println);
         } catch (Exception e) {