Support multilingal search

.travis.yml

@@ -1,5 +1,5 @@
 language: scala
-jdk: oraclejdk8
+jdk: openjdk8
 scala: 2.12.6
 script: sbt verify
 

build.sbt

@@ -195,6 +195,12 @@ lazy val optionExamples = Def.settings(
     _.withSearch(tokenizer = "[\\s\\-\\.]+")
   }
   //#search-tokenizer
+  ,
+  //#search-language
+  Compile / paradoxMaterialTheme ~= {
+    _.withSearchLanguage("ru", "jp")
+  }
+  //#search-language
 )
 
 def project(id: String, base: File): Project = {

plugin/src/main/scala/io.github.jonas.paradox.material.theme/ParadoxMaterialTheme.scala

@@ -61,6 +61,21 @@ case class ParadoxMaterialTheme(properties: Map[String, String]) {
   def withoutSearch() =
     withoutProperties("search", "search.tokenizer")
 
+  def withSearchLanguage(languages: String*) = {
+    // See(mkdocs-material v3.0.3) https://github.com/squidfunk/mkdocs-material/blob/12a79817f057b09f05c3d7cffe8893dfe9c6bde9/material/base.html#L181-L200
+    val scripts = "<script src=\"assets/javascripts/lunr/lunr.stemmer.support.js\"></script>" +: languages.flatMap { lang =>
+      val lunrScript =
+        if (Set("da", "de", "du", "es", "fi", "fr", "hu", "it", "jp", "no", "pt", "ro", "ru", "sv", "tr").contains(lang)) {
+          Seq(s"""<script src="assets/javascripts/lunr/lunr.${lang}.js"></script>""")
+        } else Seq.empty
+      if (lang == "jp") {
+        "<script src=\"assets/javascripts/lunr/tinyseg.js\"></script>" +: lunrScript
+      } else lunrScript
+    } :+ "<script src=\"assets/javascripts/lunr/lunr.multi.js\"></script>"
+    withProperties("search.language" -> languages.mkString(","))
+      .withProperties("search.scripts" -> scripts.mkString("\n"))
+  }
+
   def withCopyright(copyright: String) =
     withProperties("copyright" -> copyright)
 

src/main/paradox/getting-started.md

@@ -252,35 +252,19 @@ your site. If you want to disable search use:
 
 @@ snip [build.sbt]($root$/build.sbt) { #disable-search }
 
-<!--
 
 ### Search language
 
-Site search is implemented using [lunr.js][22], which includes stemmers for the
-English language by default, while stemmers for other languages are included
-with [lunr-languages][23], both of which are integrated with this theme. Support
-for other languages and even multilingual search can be activated by setting
-`material.search` to a comma-separated list of supported 2-letter
-language codes, e.g.:
+The multilingual search can be activated by doing the following.
 
-@@ snip [build.sbt]($root$/build.sbt) { #search-multi }
-
-This will automatically load the stemmers for the specified languages and
-set them up with site search, nothing else to be done.
-
-At the time of writing, the following languages are supported: English `en`,
-French `fr`, Spanish `es`, Italian `it`, Japanese `jp`, Dutch `du`, Danish `da`,
-Portguese `pt`, Finnish `fi`, Romanian `ro`, Hungarian `hu`, Russian `ru`,
-Norwegian `no`, Swedish `sv` and Turkish `tr`.
+@@ snip [build.sbt]($root$/build.sbt) { #search-language }
 
 @@@ warning { title="Only specify the languages you really need" }
 Be aware that including support for other languages increases the general
 JavaScript payload by around 20kb (without gzip) and by another 15-30kb per
 language.
 @@@
 
--->
-
 ### Search tokenization
 
 The separator for tokenization can also be customized, which makes it possible