build.gradle

import java.util.zip.*

plugins {
    id 'maven-publish'
}



File build = file("build")
if (build.exists())
    build.delete()
build.mkdirs()

File filtersDir = file("filters")
filtersDir.listFiles().each { directory ->

    // extract version
    String version = (new File(directory, "version.txt")).text.trim()


    def baos = new ByteArrayOutputStream()
    def zaos = new ZipOutputStream(baos)
    zaos.putNextEntry(new ZipEntry("${directory.getName()}/"))

    // just add everything in the zip
    directory.listFiles().each { f ->
        zaos.putNextEntry(new ZipEntry("${directory.getName()}/${f.getName()}"))
        zaos.write(f.bytes)
    }

    zaos.close()

    File artifactFile = new File(file("build"), "${directory.getName()}-${version}.zip")
    artifactFile.setBytes(baos.toByteArray())

    def pub = publishing.publications.create(directory.getName(), MavenPublication)
    pub.setGroupId("com.muwire.filters")
    pub.setArtifactId(directory.getName())
    pub.setVersion(version)

    // create artifact
    pub.artifact(artifactFile, { 
         extension = "zip"
    })
}