Add AsciiDoc content extraction

This makes AsciiDoc content searchable.
Also simplify document title extraction. Don't try to make
up a title if there is no title.

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

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

@@ -6,6 +6,14 @@ import com.structurizr.documentation.Section
 import com.vladsch.flexmark.ast.Heading
 import com.vladsch.flexmark.ast.Paragraph
 import com.vladsch.flexmark.parser.Parser
+import org.asciidoctor.Asciidoctor
+import org.asciidoctor.Options
+import org.asciidoctor.SafeMode
+import org.asciidoctor.ast.ContentNode
+import org.asciidoctor.ast.Document
+import org.asciidoctor.ast.StructuralNode
+import org.asciidoctor.converter.ConverterFor
+import org.asciidoctor.converter.StringConverter
 
 private val parser = Parser.builder().build()
 
@@ -41,4 +49,31 @@ private fun markdownText(content: String): String {
         .trim()
 }
 
-private fun asciidocText(content: String): String = TODO("Content extraction is not implemented yet for AsciiDoc")
+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(" ")
+}
+
+@ConverterFor("text")
+class AsciiDocTextConverter(
+    backend: String?,
+    opts: Map<String?, Any?>?
+) : StringConverter(backend, opts) {
+    override fun convert(node: ContentNode, transform: String?, o: Map<Any?, Any?>?): String? {
+        val transform1 = transform ?: node.nodeName
+        return if (node is Document)
+            node.content.toString()
+        else if (node is org.asciidoctor.ast.Section)
+            "${node.title}\n${node.content}"
+        else if (transform1 == "preamble" || transform1 == "paragraph")
+            (node as StructuralNode).content as String
+        else
+            null
+    }
+}

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

@@ -3,14 +3,12 @@ package nl.avisi.structurizr.site.generatr.site.model
 import com.structurizr.documentation.Format
 import com.structurizr.documentation.Section
 import com.vladsch.flexmark.ast.Heading
-import com.vladsch.flexmark.ast.Paragraph
 import com.vladsch.flexmark.parser.Parser
 import org.asciidoctor.Asciidoctor
 import org.asciidoctor.Options
 import org.asciidoctor.SafeMode
 
 private val parser = Parser.builder().build()
-private const val MAX_TITLE_LENGTH = 50
 
 fun Section.contentTitle(): String = when (format) {
     Format.Markdown -> markdownTitle()
@@ -21,24 +19,11 @@ fun Section.contentTitle(): String = when (format) {
 private fun Section.markdownTitle(): String {
     val document = parser.parse(content)
 
-    if (!document.hasChildren())
-        return "untitled document"
-
     val header = document.children.firstOrNull { it is Heading }?.let { it as Heading }
     if (header != null)
         return header.text.toString()
 
-    val paragraph = document.children.firstOrNull { it is Paragraph }?.let { it as Paragraph }?.chars?.toString()
-    if (paragraph != null)
-        return if (paragraph.length > MAX_TITLE_LENGTH) {
-            val whitespacePosition = paragraph.withIndex()
-                .filter { it.value.isWhitespace() }
-                .lastOrNull { it.index < MAX_TITLE_LENGTH }
-                ?.index
-            paragraph.take(whitespacePosition ?: MAX_TITLE_LENGTH)
-        } else paragraph
-
-    return "unknown document"
+    return "untitled document"
 }
 
 private fun Section.asciidocTitle(): String {
@@ -49,7 +34,5 @@ private fun Section.asciidocTitle(): String {
     if (document.title != null && document.title.isNotEmpty())
         return document.title
 
-    // TODO Content extraction is not implemented yet for AsciiDoc
-
     return "untitled document"
 }

src/test/kotlin/nl/avisi/structurizr/site/generatr/site/model/ContentTextTest.kt

@@ -38,7 +38,7 @@ class ContentTextTest {
     }
 
     @ParameterizedTest
-    @ValueSource(strings = ["= header", "== header", "=== header"])
+    @ValueSource(strings = ["= header"])
     fun `ignores asciidoc title`(content: String) {
         val section = Section(Format.AsciiDoc, content)
         assertThat(section.contentText()).isEqualTo("")
@@ -55,13 +55,13 @@ class ContentTextTest {
 
     @Test
     fun `markdown headers and paragraphs`() {
-        val section = Section(Format.Markdown, "# header\nsome content\n## subheader\nmore content")
+        val section = Section(Format.Markdown, "# header\n\nsome content\n\n## subheader\n\nmore content")
         assertThat(section.contentText()).isEqualTo("subheader some content more content")
     }
 
     @Test
     fun `asciidoc headers and paragraphs`() {
-        val section = Section(Format.AsciiDoc, "= header\nsome content\n== subheader\nmore content")
-        assertThat(section.contentText()).isEqualTo("subheader some content more content")
+        val section = Section(Format.AsciiDoc, "= header\n\nsome content\n\n== subheader\n\nmore content")
+        assertThat(section.contentText()).isEqualTo("some content subheader more content")
     }
 }

src/test/kotlin/nl/avisi/structurizr/site/generatr/site/model/ContentTitleTest.kt

@@ -34,31 +34,7 @@ class ContentTitleTest {
         .map { format ->
             DynamicTest.dynamicTest(format.name) {
                 val section = Section(format, "some content")
-                assertThat(section.contentTitle()).isEqualTo("some content")
-            }
-        }
-
-    @TestFactory
-    fun `long paragraph`() = listOf(Format.Markdown, Format.AsciiDoc)
-        .map { format ->
-            DynamicTest.dynamicTest(format.name) {
-                val section = Section(
-                    format,
-                    "some very very long content we really need to truncate since no one wants to read such an exhausting title"
-                )
-                assertThat(section.contentTitle()).isEqualTo("some very very long content we really need to")
-            }
-        }
-
-    @TestFactory
-    fun `long paragraph without whitespaces`() = listOf(Format.Markdown, Format.AsciiDoc)
-        .map { format ->
-            DynamicTest.dynamicTest(format.name) {
-                val section = Section(
-                    format,
-                    "some-very-very-long-content-we-really-need-to-truncate-since-no-one-wants-to-read-such-an-exhausting-title"
-                )
-                assertThat(section.contentTitle()).isEqualTo("some-very-very-long-content-we-really-need-to-trun")
+                assertThat(section.contentTitle()).isEqualTo("untitled document")
             }
         }
 

src/test/kotlin/nl/avisi/structurizr/site/generatr/site/model/MenuViewModelTest.kt

@@ -68,7 +68,7 @@ class MenuViewModelTest : ViewModelTest() {
         generatorContext.workspace.documentation.addSection(createSection("# Home"))
         val section1 = createSection("# Doc 1")
             .also { generatorContext.workspace.documentation.addSection(it) }
-        val section2 = createSection(" Doc Title 2")
+        val section2 = createSection("# Doc Title 2")
             .also { generatorContext.workspace.documentation.addSection(it) }
         val pageViewModel = createPageViewModel(generatorContext)
         val viewModel = MenuViewModel(generatorContext, pageViewModel)

src/test/kotlin/nl/avisi/structurizr/site/generatr/site/model/WorkspaceDocumentationSectionPageViewModelTest.kt

@@ -8,7 +8,7 @@ import kotlin.test.Test
 class WorkspaceDocumentationSectionPageViewModelTest : ViewModelTest() {
     @Test
     fun url() {
-        val section = createSection("Some section With words and 1 number")
+        val section = createSection("# Some section With words and 1 number")
 
         assertThat(WorkspaceDocumentationSectionPageViewModel.url(section))
             .isEqualTo("/some-section-with-words-and-1-number")
@@ -18,7 +18,7 @@ class WorkspaceDocumentationSectionPageViewModelTest : ViewModelTest() {
     fun `normalized url`() {
         val generatorContext = generatorContext()
         val viewModel = WorkspaceDocumentationSectionPageViewModel(
-            generatorContext, createSection("Some section With words and 1 number")
+            generatorContext, createSection("# Some section With words and 1 number")
         )
 
         assertThat(viewModel.url).isEqualTo("/some-section-with-words-and-1-number")