Jansi escape sequences ignored when running javaexec from gradle

When i run a class that outputs colour (using jansi) via a gradle JavaExec task, all of the escape sequences are lost. It works fine if I invoke the class directly from java.

For example

class AnsiConsoleTest {
 def static main(args) {
  System.out.println( ansi().render("@|red Hello|@ @|green World|@") )

Using the following task:

task runConsoleTest(type: JavaExec, dependsOn: "classes") {
 description = "Runs the Ansi Console Tester"
 main = 'AnsiConsoleTest'
 classpath configurations.compile, configurations.runtime, sourceSets.main.output

and invoking gives:

$ gradle runConsoleTest
:compileJava UP-TO-DATE
:processResources UP-TO-DATE
Hello World
  Total time: 5.437 secs

where the UP-TO-DATE messages are coloured correctly, but my output is not.

Is there a way to get it to work via the gradle task invocation?

I did a search on forums, but the only thing I could find vaguely related to colour issues was this feature request: http://forums.gradle.org/gradle/topics/feature_request_force_color_option_color

but this doesn’t appear to be my problem, I am seeing colour in the build process, just not on execution of my class.

Thanks, Mark

This is always the case with forked processes in Java. Pre Java 7, there’s no way to have a child process inherit the stdio handles.

What we will do, eventually, is add support for stdio handle inheritance (using JNA for pre Java 7). I’ve raised GRADLE-2530 for this.

Unfortunately right now, there’s no way to give this child process access to the console.

Thanks for the reply Luke.