Create and keep only one Asciidoctor instance

It's much cheaper to reuse an already created instance.

Co-authored-by: Fabian Illner <fabian@illner.dev>

src/main/kotlin/nl/avisi/structurizr/site/generatr/site/model/Asciidoctor.kt

@@ -0,0 +1,7 @@
+package nl.avisi.structurizr.site.generatr.site.model
+
+import org.asciidoctor.Asciidoctor
+
+val asciidoctor: Asciidoctor = Asciidoctor.Factory.create().apply {
+    javaConverterRegistry().register(AsciiDocTextConverter::class.java)
+}

src/main/kotlin/nl/avisi/structurizr/site/generatr/site/model/ContentText.kt

@@ -50,12 +50,8 @@ private fun markdownText(content: String): String {
 }
 
 private fun asciidocText(content: String): String {
-    val asciidoctor = Asciidoctor.Factory.create()
-    asciidoctor.javaConverterRegistry().register(AsciiDocTextConverter::class.java)
-
     val options = Options.builder().safe(SafeMode.SERVER).backend("text").build()
     val text = asciidoctor.convert(content, options)
-    asciidoctor.shutdown()
 
     return text.lines().joinToString(" ")
 }

src/main/kotlin/nl/avisi/structurizr/site/generatr/site/model/ContentTitle.kt

@@ -27,10 +27,9 @@ private fun Section.markdownTitle(): String {
 }
 
 private fun Section.asciidocTitle(): String {
-    val asciidoctor = Asciidoctor.Factory.create()
     val options = Options.builder().safe(SafeMode.SERVER).build()
     val document = asciidoctor.load(content, options)
-    asciidoctor.shutdown()
+
     if (document.title != null && document.title.isNotEmpty())
         return document.title
 

src/main/kotlin/nl/avisi/structurizr/site/generatr/site/model/ToHtml.kt

@@ -58,7 +58,6 @@ private fun asciidocToHtml(
     asciidoc: String,
     svgFactory: (key: String, url: String) -> String?
 ): String {
-    val asciidoctor = Asciidoctor.Factory.create()
     val options = Options.builder()
         .safe(SafeMode.SERVER)
         // Docs dir needs to be exposed from structurizr, which is not the case at the moment.
@@ -69,7 +68,7 @@ private fun asciidocToHtml(
         .backend("html5")
         .build()
     val html = asciidoctor.convert(asciidoc, options)
-    asciidoctor.shutdown()
+
     return Jsoup.parse(html)
         .apply {
             body().transformEmbeddedDiagramElements(pageViewModel, svgFactory)