Add Asciidoctor attribute support

build.sbt

@@ -31,8 +31,8 @@ libraryDependencies ++= Seq(
   "org.foundweekends" %% "pamflet-library" % "0.8.0",
   "org.yaml"        % "snakeyaml"        % "1.24",
   "com.typesafe"    % "config"           % "1.3.4",
-  "org.asciidoctor" % "asciidoctorj"     % "1.6.2",
-  "org.asciidoctor" % "asciidoctorj-diagram" % "1.5.16"
+  "org.asciidoctor" % "asciidoctorj"     % "2.1.0",
+  "org.asciidoctor" % "asciidoctorj-diagram" % "1.5.18"
 )
 
 addSbtPlugin("com.lightbend.paradox" % "sbt-paradox" % "0.5.5")

src/main/paradox/generators/asciidoctor.md

@@ -14,4 +14,17 @@ Similarly, the output can be redirected to a subdirectory of `target/site` via t
 
 @@ snip[siteSubdirName](/src/sbt-test/asciidoctor/can-use-asciidoctor/build.sbt) { #siteSubdirName }
 
+## Attributes
+
+Asciidoctor allows the rendering of documents to be inflenced by [attributes](https://asciidoctor.org/docs/user-manual/#attributes).
+
+You can configure attributes by setting `asciidoctorAttributes`.
+
+```sbt
+asciidoctorAttributes := Map(
+  "skip-front-matter" -> "", // attribute without value can be set to empty string
+  "lang" -> "nl" // attribute with value
+)
+```
+
 [Asciidoctor]: http://asciidoctor.org

src/main/scala/com/typesafe/sbt/site/asciidoctor/AsciidoctorKeys.scala

@@ -0,0 +1,10 @@
+package com.typesafe.sbt.site.asciidoctor
+
+import sbt.SettingKey
+
+trait AsciidoctorKeys {
+  val asciidoctorAttributes = SettingKey[Map[String, String]](
+    "asciidoctor-attributes",
+    "Asciidoctor allows the rendering process to be influenced by so-called attributes. " +
+        "You can read more about attributes here: https://asciidoctor.org/docs/user-manual/#attributes")
+}

src/main/scala/com/typesafe/sbt/site/asciidoctor/AsciidoctorPlugin.scala

@@ -1,11 +1,14 @@
 package com.typesafe.sbt.site.asciidoctor
 
 import java.util
-import com.typesafe.sbt.site.SitePlugin.autoImport.siteSubdirName
+
 import com.typesafe.sbt.site.SitePlugin
+import com.typesafe.sbt.site.SitePlugin.autoImport.siteSubdirName
 import com.typesafe.sbt.site.util.SiteHelpers
 import org.asciidoctor.Asciidoctor.Factory
-import org.asciidoctor.{AsciiDocDirectoryWalker, Options, SafeMode}
+import org.asciidoctor.Options
+import org.asciidoctor.SafeMode
+import org.asciidoctor.jruby.AsciiDocDirectoryWalker
 import sbt.Keys._
 import sbt._
 
@@ -14,19 +17,26 @@ object AsciidoctorPlugin extends AutoPlugin {
   override def requires = SitePlugin
   override def trigger = noTrigger
 
-  object autoImport {
+  object autoImport extends AsciidoctorKeys {
     val Asciidoctor = config("asciidoctor")
   }
   import autoImport._
-
+  override lazy val globalSettings = Seq(
+    asciidoctorAttributes := Map()
+  )
   override def projectSettings = asciidoctorSettings(Asciidoctor)
 
   /** Creates settings necessary for running Asciidoctor in the given configuration. */
   def asciidoctorSettings(config: Configuration): Seq[Setting[_]] =
     inConfig(config)(
       Seq(
         includeFilter := AllPassFilter,
-        mappings := generate(sourceDirectory.value, target.value, includeFilter.value, version.value),
+        mappings := generate(
+          sourceDirectory.value,
+          target.value,
+          includeFilter.value,
+          version.value,
+          asciidoctorAttributes.value),
         siteSubdirName := ""
       )
     ) ++
@@ -36,10 +46,11 @@ object AsciidoctorPlugin extends AutoPlugin {
 
   /** Run asciidoctor in new ClassLoader. */
   private[sbt] def generate(
-    input: File,
-    output: File,
-    includeFilter: FileFilter,
-    version: String): Seq[(File, String)] = {
+      input: File,
+      output: File,
+      includeFilter: FileFilter,
+      version: String,
+      userSetAsciidoctorAttributes: Map[String, String]): Seq[(File, String)] = {
     val oldContextClassLoader = Thread.currentThread().getContextClassLoader
     Thread.currentThread().setContextClassLoader(this.getClass.getClassLoader)
     val asciidoctor = Factory.create()
@@ -49,10 +60,17 @@ object AsciidoctorPlugin extends AutoPlugin {
     options.setToDir(output.getAbsolutePath)
     options.setDestinationDir(output.getAbsolutePath)
     options.setSafe(SafeMode.UNSAFE)
+
     //pass project.version to asciidoctor as attribute project-version
     //need to do this explicitly through HashMap because otherwise JRuby complains
     val attributes = new util.HashMap[String, AnyRef]()
     attributes.put("project-version", version)
+
+    // Add user configured attributes into the mix
+    userSetAsciidoctorAttributes.foreach { case (key, value) =>
+      attributes.put(key, value)
+    }
+
     options.setAttributes(attributes)
     asciidoctor.convertDirectory(new AsciiDocDirectoryWalker(input.getAbsolutePath), options)
     val inputImages = input / "images"

src/sbt-test/asciidoctor/asciidoctor-skips-frontmatter/build.sbt

@@ -0,0 +1,23 @@
+name := "test"
+
+//#enablePlugin
+enablePlugins(AsciidoctorPlugin)
+//#enablePlugin
+
+//#siteSubdirName
+// Puts output in `target/site/asciimd`
+siteSubdirName in Asciidoctor := "asciimd"
+asciidoctorAttributes in Asciidoctor := Map(
+  "skip-front-matter" -> "", // skip-front-matter is a flag that just has to be present.
+  "lang" -> "nl")
+//#siteSubdirName
+
+TaskKey[Unit]("checkContent") := {
+  val dest = (target in makeSite).value / (siteSubdirName in Asciidoctor).value
+  val index = dest / "index.html"
+  assert(index.exists, s"${index.getAbsolutePath} did not exist")
+  val content = IO.readLines(index)
+
+  assert(content.exists(_.contains("lang=\"nl\"")), s"Did not find expected content in:\n${content.mkString("\n")}")
+  assert(content.forall(!_.contains("title: \"Document Title\"")), s"Expected front-matter metadata to be removed from the output in:\n${content.mkString("\n")}")
+}

src/sbt-test/asciidoctor/asciidoctor-skips-frontmatter/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("com.typesafe.sbt" % "sbt-site" % sys.props("project.version"))

src/sbt-test/asciidoctor/asciidoctor-skips-frontmatter/src/asciidoctor/index.adoc

@@ -0,0 +1,11 @@
+---
+title: "Document Title"
+---
+
+== Hello, AsciiDoc!
+Doc Writer <doc@example.com>
+:project-version:
+
+This tests should show that `attributes` are taken into account while rendering.
+
+This is passed from the sbt build: {project-version}

src/sbt-test/asciidoctor/asciidoctor-skips-frontmatter/test

@@ -0,0 +1,2 @@
+> makeSite
+> checkContent