Posted by owahlen on May 26, 2014; 12:25pm
URL: https://discuss.asciidoctor.org/Integrate-asciidoctor-gradle-plugin-with-asciidoctor-diagram-tp1769.html

I use the asciidoctor-gradle plugin to create a deckjs based presentation.
However I also need ditaa for some diagrams which I cannot get to work.

My main problem is that asciidoctor-diagram needs additional ruby gems and I do not know how to integrate them into the gradle build.
My current approach is to download the asciidoctor-diagram gem using gradle from torquebox and then add it to the rubyRuntime class instance inside the gradle build process.
I am pretty familiar with Java and gradle. However my Ruby knowledge is not sufficient to get this to work.
Can someone please have a look at the following build.gradle and point me into the right direction?

import java.lang.reflect.Field

buildscript {
	repositories {
		maven {
			name 'Bintray Asciidoctor repo'
			url 'http://dl.bintray.com/content/aalmiray/asciidoctor'
		}
		maven {
			name 'Bintray JCenter'
			url 'http://jcenter.bintray.com'
		}
		mavenLocal()
	}

	dependencies {
	    classpath 'org.asciidoctor:asciidoctor-gradle-plugin:0.7.0'
	}
}

apply plugin: 'asciidoctor'

repositories {
	maven {
		name 'rubygems-release'
		url 'http://rubygems-proxy.torquebox.org/releases'
	}
	maven {
		name 'rubygems-prerelease'
		url 'http://rubygems-proxy.torquebox.org/prereleases'
	}
}

configurations {
        // create a Configuration called "gems" and add it to the project’s ConfigurationsContainer:
	gems
}

dependencies {
//  Add dependencies to the gems-Configuration
//  I am not sure what other gems are needed...
//	gems 'rubygems:thread_safe:0.2.0@gem'
//	gems 'rubygems:haml:4.0.4@gem'
//	gems 'rubygems:open-uri-cached:0.0.5@gem'
//	gems 'rubygems:asciidoctor:1.5.0.preview3-SNAPSHOT@gem'
//	gems 'rubygems:coderay:1.1.0@gem'
//	gems 'rubygems:tilt:2.0.0@gem'
//	gems 'rubygems:erubis:2.7.0@gem'
//	gems 'rubygems:slim:2.0.2@gem'
//	gems 'rubygems:rjb:1.4.9@gem'
	gems 'rubygems:asciidoctor-diagram:1.1.5@gem'
}

import org.asciidoctor.Asciidoctor
import org.asciidoctor.internal.JRubyAsciidoctor
import org.jruby.Ruby

import static org.asciidoctor.internal.JRubyAsciidoctor.*;

// task that copies the needed gems from torquebox into the "build/gems" directory (this works!)
File gemPath = new File(buildDir, 'gems')
task provideGemFiles(type: Copy) {
	from configurations.gems
	into gemPath
}

asciidoctor {
        // this is really dirty: I have to access the rubyRuntime via reflection since it is protected...
	JRubyAsciidoctor jRubyAsciidoctor = (JRubyAsciidoctor) Asciidoctor.Factory.create()
	Field field = JRubyAsciidoctor.class.getDeclaredField('rubyRuntime')
	field.setAccessible(true)
	Ruby ruby = (Ruby) field.get(jRubyAsciidoctor)
	ruby.instanceConfig.setLoadPaths([gemPath.canonicalPath])
	ruby.evalScriptlet("require 'rubygems‘")
        // the following require statement does not work since Ruby does not find the asciidoctor-diagram gem
	ruby.evalScriptlet("require 'asciidoctor-diagram'")

	asciidoctor = jRubyAsciidoctor
	sourceDir = file('asciidoc')
	outputDir = buildDir
	backend = 'deckjs'
	options = [
			template_dir: 'asciidoctor-backends/haml',
			eruby       : 'erubis',
			attributes  : [
					backend             : 'deckjs',
					deckjs_theme: 'Web-2.0',
					deckjs_transition: 'fade',
					customjs: '',
					customcss: '',
					blank: '',
					goto: '',
					menu: '',
					navigation: '',
					status: '',
					toc: '',
					'source-highlighter': 'highlightjs'
			]
	]
}
asciidoctor.dependsOn(provideGemFiles)
task build(dependsOn: 'asciidoctor')