Add support for additional highlighted languages

Fixes 47degrees#275

docs/src/main/tut/docs/settings.md

@@ -154,6 +154,24 @@ micrositeHighlightTheme := "monokai"
 ```
 [Available themes: https://cdnjs.com/libraries/highlight.js/](https://cdnjs.com/libraries/highlight.js/)
 
+- `micrositeHighlightLanguages`: by default, Highlight.js is configured to support syntax highlighting for `java`, `scala` and `bash`. You can add additional languages:
+
+```
+micrositeHighlightTheme ++= Seq("protobuf", "thrift")
+```
+
+Then, use it as follows:
+
+~~~
+```protobuf
+message MyMessage {
+   optional int32 i = 1;
+}
+```
+~~~
+
+[Available languages: https://cdnjs.com/libraries/highlight.js/](https://cdnjs.com/libraries/highlight.js/)
+
 - `micrositeImgDirectory`: the plugin provides some basic images, but you can add new images to personalize the microsite. This is the property where you can specify where they will be placed. The images in this folder will be automatically copied by the plugin, and they will be placed together with the rest of the Jekyll resources. By default, its value is `(resourceDirectory in Compile).value / "microsite" / "img"` but you can override it, for instance:
 
 ```

src/main/scala/microsites/MicrositeKeys.scala

@@ -77,6 +77,8 @@ trait MicrositeKeys {
   val micrositeDocumentationLabelDescription: SettingKey[String] =
     settingKey[String]("Microsite site documentation Label Description")
   val micrositeHighlightTheme: SettingKey[String] = settingKey[String]("Microsite Highlight Theme")
+  val micrositeHighlightLanguages: SettingKey[Seq[String]] =
+    settingKey[Seq[String]]("Microsite Highlight Languages")
   val micrositeConfigYaml: SettingKey[ConfigYml] =
     settingKey[ConfigYml]("Microsite _config.yml file configuration.")
   val micrositeImgDirectory: SettingKey[File] = settingKey[File](
@@ -193,6 +195,7 @@ trait MicrositeAutoImportSettings extends MicrositeKeys {
         ),
         visualSettings = MicrositeVisualSettings(
           highlightTheme = micrositeHighlightTheme.value,
+          highlightLanguages = micrositeHighlightLanguages.value,
           palette = micrositePalette.value,
           favicons = micrositeFavicons.value,
           shareOnSocial = micrositeShareOnSocial.value

src/main/scala/microsites/MicrositesPlugin.scala

@@ -66,6 +66,7 @@ object MicrositesPlugin extends AutoPlugin {
     micrositeTwitterCreator := "",
     micrositeShareOnSocial := true,
     micrositeHighlightTheme := "default",
+    micrositeHighlightLanguages := Seq("scala", "java", "bash"),
     micrositeConfigYaml := ConfigYml(
       yamlPath = Some((resourceDirectory in Compile).value / "microsite" / "_config.yml")),
     micrositeImgDirectory := (resourceDirectory in Compile).value / "microsite" / "img",

src/main/scala/microsites/layouts/Layout.scala

@@ -205,17 +205,25 @@ abstract class Layout(config: MicrositeSettings) {
         )
       } else Nil
 
+    val BuiltinLanguages = Set("scala", "java", "bash")
+
+    val languages =
+      config.visualSettings.highlightLanguages.map(lang => s"'$lang'").mkString("[", ",", "]")
+
+    val languageScripts =
+      config.visualSettings.highlightLanguages.filterNot(BuiltinLanguages.contains).map { lang =>
+        script(
+          src := s"https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/languages/${lang}.min.js")
+      }
+
     List(
       script(src := "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"),
       script(
         src := "https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"),
-      script(src := "{{site.url}}{{site.baseurl}}/highlight/highlight.pack.js"),
-      script("""hljs.configure({
-               |languages:['scala','java','bash']
-               |});
-               |hljs.initHighlighting();
-             """.stripMargin)
-    ) ++ customJsList ++ customCDNList ++ gitSidecar
+      script(src := "{{site.url}}{{site.baseurl}}/highlight/highlight.pack.js")
+    ) ++ languageScripts ++ List(script(s"""hljs.configure({languages:${languages}});
+                |hljs.initHighlighting();
+              """.stripMargin)) ++ customJsList ++ customCDNList ++ gitSidecar
   }
 
   def kazariEnableScript: TypedTag[String] = script(s"""

src/main/scala/microsites/microsites.scala

@@ -74,6 +74,7 @@ case class MicrositeFavicon(filename: String, sizeDescription: String)
 
 case class MicrositeVisualSettings(
     highlightTheme: String,
+    highlightLanguages: Seq[String],
     palette: Map[String, String],
     favicons: Seq[MicrositeFavicon],
     shareOnSocial: Boolean)

src/sbt-test/microsites/microsites-config-keys/build.sbt

@@ -17,6 +17,7 @@ micrositeTwitter := "@47deg"
 micrositeBaseUrl := "/test-microsite"
 micrositeDocumentationUrl := "/api"
 micrositeHighlightTheme := "just-another-theme"
+micrositeHighlightLanguages := Seq("scala", "bash", "protobuf")
 micrositeGithubOwner := "47deg"
 micrositeGithubRepo := "sbt-microsites"
 micrositePalette := Map(

src/test/scala/microsites/util/Arbitraries.scala

@@ -114,6 +114,7 @@ trait Arbitraries {
       twitterCreator                         ← Arbitrary.arbitrary[String]
       analytics                              ← Arbitrary.arbitrary[String]
       highlightTheme                         ← Arbitrary.arbitrary[String]
+      highlightLanguages                     ← Arbitrary.arbitrary[Seq[String]]
       micrositeConfigYaml                    ← configYamlArbitrary.arbitrary
       micrositeImgDirectory                  ← Arbitrary.arbitrary[File]
       micrositeCssDirectory                  ← Arbitrary.arbitrary[File]
@@ -158,7 +159,12 @@ trait Arbitraries {
           twitter,
           twitterCreator,
           analytics),
-        MicrositeVisualSettings(highlightTheme, palette, favicon, shareOnSocial),
+        MicrositeVisualSettings(
+          highlightTheme,
+          highlightLanguages,
+          palette,
+          favicon,
+          shareOnSocial),
         MicrositeTemplateTexts(micrositeFooterText),
         micrositeConfigYaml,
         MicrositeFileLocations(