Use Spring Doc Resources for reference docs

This commit removes the custom static resources for the reference
documentation and instead uses the new Spring Doc Resources project
https://github.com/spring-io/spring-doc-resources

The asciidoctor theme is now shared between Spring projects and
integrated in the project build.

Author: bclozel

build.gradle

@@ -148,6 +148,7 @@ configure(allprojects) { project ->
 	}
 
 	repositories {
+		mavenLocal()
 		maven { url "https://repo.spring.io/libs-release" }
 	}
 

gradle/docs.gradle

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -79,13 +79,32 @@ dokka {
 	}
 }
 
+configurations {
+	docs
+}
+
+dependencies {
+	// for documentation resources
+	docs "io.spring.docresources:spring-doc-resources:0.1.0.RELEASE@zip"
+}
+
+task extractDocResources(type: Sync) {
+	dependsOn configurations.docs
+	from "src/docs/asciidoc/"
+	from {
+		configurations.docs.collect { zipTree(it) }
+	}
+	into "$buildDir/asciidoc/build"
+}
+
 asciidoctor {
+	sourceDir "$buildDir/asciidoc/build"
 	sources {
 		include '*.adoc'
 	}
 	resources {
 		from(sourceDir) {
-			include 'images/*', 'stylesheets/*', 'tocbot-3.0.2/*'
+			include 'images/*', 'css/**', 'js/**'
 		}
 	}
 	logDocuments = true
@@ -98,17 +117,21 @@ asciidoctor {
 	attributes  'icons': 'font',
 			'idprefix': '',
 			'idseparator': '-',
-			docinfo: '',
+			docinfo: 'shared',
 			revnumber: project.version,
 			sectanchors: '',
 			sectnums: '',
-			'source-highlighter': 'coderay@', // TODO switch to 'rouge' once supported by the html5 backend
-			stylesdir: 'stylesheets/',
-			stylesheet: 'main.css',
+			'source-highlighter=highlight.js',
+			'highlightjsdir=js/highlight',
+			'highlightjs-theme=atom-one-dark-reasonable',
+			stylesdir: "css/",
+			stylesheet: 'spring.css',
 			'spring-version': project.version
 
 }
 
+asciidoctor.dependsOn extractDocResources
+
 task docsZip(type: Zip, dependsOn: ['api', 'asciidoctor', 'dokka']) {
 	group = "Distribution"
 	baseName = "spring-framework"