Add asciidoctor task

Issue gh-613

build.gradle

@@ -12,7 +12,6 @@ buildscript {
     }
     dependencies {
         classpath "com.github.ben-manes:gradle-versions-plugin:0.17.0"
-        classpath('org.asciidoctor:asciidoctor-gradle-plugin:1.5.1')
         classpath("io.spring.gradle:spring-io-plugin:0.0.6.RELEASE")
         classpath "org.jfrog.buildinfo:build-info-extractor-gradle:4.12.0"
         classpath 'org.hidetake:gradle-ssh-plugin:2.10.1'
@@ -28,4 +27,24 @@ description = "Spring LDAP"
 nohttp {
 	allowlistFile = project.file("etc/nohttp/allowlist.lines")
 	source.exclude "buildSrc/build/**"
+}
+
+asciidoctor {
+	outputDir = new File("$buildDir/docs")
+	attributes([
+		copycss : '',
+		icons : 'font',
+		'source-highlighter': 'prettify',
+		sectanchors : '',
+		toc2: '',
+		idprefix: '',
+		idseparator: '-',
+		doctype: 'book',
+		numbered: '',
+		'spring-ldap-version' : project.version,
+		revnumber : project.version
+	])
+	options = [
+		eruby: 'erubis'
+	]
 }

buildSrc/build.gradle

@@ -91,6 +91,7 @@ dependencies {
     implementation 'io.spring.javaformat:spring-javaformat-gradle-plugin:0.0.15'
     implementation 'io.spring.nohttp:nohttp-gradle:0.0.10'
     implementation 'net.sourceforge.htmlunit:htmlunit:2.37.0'
+    implementation 'org.asciidoctor:asciidoctor-gradle-jvm:3.3.2'
     implementation 'org.hidetake:gradle-ssh-plugin:2.10.1'
     implementation 'org.jfrog.buildinfo:build-info-extractor-gradle:4.26.1'
     implementation 'org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:2.7.1'

buildSrc/src/main/groovy/io/spring/gradle/convention/DocsPlugin.groovy

@@ -1,8 +1,10 @@
 package io.spring.gradle.convention
 
+import org.gradle.api.Action
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.Task
+import org.gradle.api.artifacts.dsl.RepositoryHandler
 import org.gradle.api.plugins.BasePlugin
 import org.gradle.api.plugins.PluginManager
 import org.gradle.api.tasks.bundling.Zip
@@ -17,9 +19,23 @@ public class DocsPlugin implements Plugin<Project> {
 
 		PluginManager pluginManager = project.getPluginManager();
 		pluginManager.apply(BasePlugin);
+		pluginManager.apply("org.asciidoctor.jvm.convert");
 		pluginManager.apply(DeployDocsPlugin);
 		pluginManager.apply(JavadocApiPlugin);
 
+		project.getGradle().afterProject(new Action<Project>() {
+			@Override
+			public void execute(Project p) {
+				RepositoryHandler repositories = p.getRepositories();
+				if (repositories.isEmpty()) {
+					repositories.mavenCentral();
+					repositories.maven(repo -> {
+						repo.setUrl(URI.create("https://repo.spring.io/release"));
+					});
+				}
+			}
+		});
+
 		Task docsZip = project.tasks.create('docsZip', Zip) {
 			dependsOn 'api'
 			group = 'Distribution'
@@ -27,7 +43,10 @@ public class DocsPlugin implements Plugin<Project> {
 			archiveClassifier = 'docs'
 			description = "Builds -${archiveClassifier.get()} archive containing all " +
 				"Docs for deployment at docs.spring.io"
-
+			from(project.tasks.asciidoctor.outputs) {
+				into 'reference'
+				include '**'
+			}
 			from(project.tasks.api.outputs) {
 				into 'api'
 			}