Standard error capturing init script

init.gradle

rootProject {
    def errorFile = file("${rootProject.buildDir}/errors.log")
    def errorListener = new ErrorCapture(errorFile)

    allprojects {
        logging.addStandardErrorListener(errorListener)

        tasks.all {
            logging.addStandardErrorListener(errorListener)
        }
    }
}

class ErrorCapture implements StandardOutputListener {
    private final File errorFile

    ErrorCapture(File errorFile) {
        this.errorFile = errorFile
        errorFile.parentFile.mkdirs()
    }

    void onOutput(CharSequence output) {
        errorFile << output
    }
}