Modernize the look and feel and remove Docbook

* Upgrade to latest `sciidoctor-gradle-plugin` and `asciidoctorj-pdf`
* Remove `Authors:` and move `version` before Copyright in the `index.adoc`

build.gradle

@@ -4,8 +4,8 @@ buildscript {
 		maven { url 'https://repo.spring.io/plugins-release' }
 	}
 	dependencies {
-		classpath 'io.spring.gradle:docbook-reference-plugin:0.3.1'
-		classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.5.8'
+		classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.5.9.2'
+		classpath 'org.asciidoctor:asciidoctorj-pdf:1.5.0-alpha.16'
 		classpath 'me.champeau.gradle:gradle-javadoc-hotfix-plugin:0.1'
 		classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
 		classpath "org.jetbrains.kotlin:kotlin-allopen:$kotlinVersion"
@@ -22,8 +22,6 @@ apply plugin: 'base'
 apply plugin: 'project-report'
 apply plugin: 'idea'
 
-def docsDir = 'src/reference/asciidoc'
-
 ext {
 	isTravisBuild = System.getenv().get("TRAVIS") == 'true'
 	linkHomepage = 'https://projects.spring.io/spring-amqp'
@@ -32,6 +30,7 @@ ext {
 	linkScmUrl           = 'https://github.com/spring-projects/spring-amqp'
 	linkScmConnection    = 'git://github.com/spring-projects/spring-amqp.git'
 	linkScmDevConnection = 'git@github.com:spring-projects/spring-amqp.git'
+	docResourcesVersion = '0.1.0.RELEASE'
 }
 
 allprojects {
@@ -329,40 +328,64 @@ project('spring-rabbit-test') {
 
 }
 
+configurations {
+	docs
+}
+
+dependencies {
+	docs "io.spring.docresources:spring-doc-resources:${docResourcesVersion}@zip"
+}
+
+task prepareAsciidocBuild(type: Sync) {
+	dependsOn configurations.docs
+	from {
+		configurations.docs.collect { zipTree(it) }
+	}
+	from 'src/reference/asciidoc/'
+	into "$buildDir/asciidoc"
+}
+
 apply plugin: 'org.asciidoctor.convert'
 
-asciidoctor {
-	sourceDir = file("$docsDir")
+task reference(type: org.asciidoctor.gradle.AsciidoctorTask) {
+	backends = ['pdf']
+	sourceDir "$buildDir/asciidoc"
 	sources {
 		include 'index.adoc'
-	}
-	backends = ['html5', 'docbook']
-	logDocuments = true
-	options = [
-		doctype: 'book',
-	]
-	attributes = [
-		docinfo: '',
-		toc2: '',
-		'compat-mode': '',
-		imagesdir: '',
-		stylesdir: "stylesheets/",
-		stylesheet: 'golo.css',
-		'spring-amqp-version': "$version",
-		'source-highlighter': 'highlightjs'
-	]
+		}
+	options doctype: 'book', eruby: 'erubis'
+	attributes 'source-highlighter': 'coderay',
+		    'icons': 'font', 
+            "project-version=$project.version"
 }
 
-apply plugin: DocbookReferencePlugin
+reference.dependsOn asciidoctor
 
-reference {
-	sourceFileName = 'index.xml'
-	sourceDir = file("$buildDir/asciidoc/docbook")
-	pdfFilename = 'spring-amqp-reference.pdf'
-	expandPlaceholders = ''
+asciidoctor {
+	sourceDir "$buildDir/asciidoc"
+	sources {
+		include 'index.adoc'
+	}
+	resources {
+		from(sourceDir) {
+			include 'images/*', 'css/**', 'js/**'
+		}
+	}
+	logDocuments = true
+	backends = ['html5']
+	options doctype: 'book', eruby: 'erubis'
+	attributes 'docinfo': 'shared',
+		stylesdir: "css/",
+		stylesheet: 'spring.css',
+		'linkcss': true,
+		'icons': 'font',
+		'source-highlighter=highlight.js',
+		'highlightjsdir=js/highlight',
+		'highlightjs-theme=atom-one-dark-reasonable',
+		"project-version=$project.version"
 }
 
-reference.dependsOn asciidoctor
+asciidoctor.dependsOn prepareAsciidocBuild
 
 sonarqube {
 	properties {
@@ -426,7 +449,7 @@ task schemaZip(type: Zip) {
 	}
 }
 
-task docsZip(type: Zip) {
+task docsZip(type: Zip, dependsOn: [reference]) {
 		group = 'Distribution'
 		classifier = 'docs'
 		description = "Builds -${classifier} archive containing api and reference " +
@@ -440,7 +463,12 @@ task docsZip(type: Zip) {
 			into 'api'
 		}
 
-		from (reference) {
+		from ('build/asciidoc/html5') {
+			into 'reference'
+		}
+
+		from ('build/asciidoc/pdf') {
+			include 'index.pdf'
 			into 'reference'
 		}
 }

src/reference/asciidoc/index.adoc

@@ -1,8 +1,18 @@
 [[spring-amqp-reference]]
-
 = Spring AMQP
+:toc: left
+:toclevels: 4
+:numbered:
+:icons: font
+:hide-uri-scheme:
+Mark Pollack; Mark Fisher; Oleg Zhurakousky; Dave Syer; Gary Russell; Gunnar Hillert; Artem Bilan; Stéphane Nicoll; Arnaud Cogoluègnes; Jay Bryant
+
+*{project-version}*
+
+(C) 2010 - 2019 by Pivotal Software, Inc.
+
+Copies of this document may be made for your own use and for distribution to others, provided that you do not charge any fee for such copies and further provided that each copy contains this Copyright Notice, whether distributed in print or electronically.
 
-:toc:
 
 == Preface