Gradle: task's standardOutput to file and terminal simultaneously

Question

I want to change standardOutput of one build task to file, because it will be parsed later by another task.

But also, I would like to have simultaneously output in the terminal to see what's going on in the build.

This is how I changed output of the task to the file:

task sampleTaskWithOutputToFile(type: Exec) {
    commandLine 'someCommand', 'param1'

    doFirst {
        standardOutput = new FileOutputStream('someFolder/someFile.out')
    }
} 

As I understand, I can write own OutputStream implementation with output to file and standard System.out simultaneously but I would like to use existing solution.

Also, I can not use unix tools like tee for that, because task can be launched from any OS (Mac OS, Some Linux or even Windows...)

Thanks!

Answer 1

Expounding on Peter N's comment regarding TeeOutputStream:

task sampleTaskWithOutputToFile(type: Exec) {
    commandLine 'someCommand', 'param1'

    doFirst {
        standardOutput = new org.apache.tools.ant.util.TeeOutputStream(
            new FileOutputStream("someFolder/someFile.out"), System.out);
    }
}