KCauldron-minecraft-server/buildSrc/src/main/groovy/kcauldron/InstallBundle.groovy

package kcauldron

import org.gradle.api.DefaultTask
import org.gradle.api.GradleException
import org.gradle.api.tasks.InputFile
import org.gradle.api.tasks.OutputDirectory
import org.gradle.api.tasks.TaskAction
import org.gradle.api.tasks.incremental.IncrementalTaskInputs

class InstallBundle extends DefaultTask {
    @InputFile
    def File installer

    @OutputDirectory
    def File getInstallLocation() {
        new File(project.buildDir, 'bundle')
    }

    @TaskAction
    def install() {
        installLocation.deleteDir()
        installLocation.mkdirs()
        for (int i = 0; i < 3; i++) {
            def result = project.javaexec {
                workingDir installLocation
                classpath installer
                main 'net.minecraftforge.installer.SimpleInstaller'
                args '--installServer'
                standardOutput new NopOutputStream()
                errorOutput new NopOutputStream()
            }
            if (result.exitValue == 0) return
        }
        throw new GradleException("Failed to install bundle into ${installLocation}")
    }

    private static final class NopOutputStream extends OutputStream {
        @Override
        void write(byte[] b, int off, int len) throws IOException {
        }

        @Override
        void write(byte[] b) throws IOException {
        }

        @Override
        void write(int b) throws IOException {
        }
    }
}