spring-security/docs/guides/build.gradle

apply plugin: 'asciidoctor'

asciidoctor {
    options = [
      eruby: 'erubis',
      eruby: 'erubis',
      attributes: [
          copycss : '',
          icons : 'font',
          'source-highlighter': 'prettify',
          sectanchors : '',
          toc2: '',
          idprefix: '',
          idseparator: '-',
          doctype: 'book',
          'spring-security-version' : project.version,
          revnumber : project.version
      ]
    ]
}

ext.spec = copySpec {
    into ('guides') {
        from(asciidoctor.outputDir)
        exclude 'build', 'Guardfile'
    }
}