Empty modules filtering (#1699)

2 files changed, 12 insertions, 4 deletions

diff --git a/plugins/base/src/main/kotlin/transformers/documentables/DefaultDocumentableMerger.kt b/plugins/base/src/main/kotlin/transformers/documentables/DefaultDocumentableMerger.kt
index 4c931230..94e27424 100644
--- a/plugins/base/src/main/kotlin/transformers/documentables/DefaultDocumentableMerger.kt
+++ b/plugins/base/src/main/kotlin/transformers/documentables/DefaultDocumentableMerger.kt
@@ -12,9 +12,8 @@ import org.jetbrains.kotlin.utils.addToStdlib.firstNotNullResult
 internal class DefaultDocumentableMerger(val context: DokkaContext) : DocumentableMerger {
     private val dependencyInfo = context.getDependencyInfo()
 
-    override fun invoke(modules: Collection<DModule>): DModule {
-
-        return modules.reduce { left, right ->
+    override fun invoke(modules: Collection<DModule>): DModule? =
+        modules.reduceOrNull { left, right ->
             val list = listOf(left, right)
             DModule(
                 name = modules.map { it.name }.distinct().joinToString("|"),
@@ -26,7 +25,6 @@ internal class DefaultDocumentableMerger(val context: DokkaContext) : Documentab
                 sourceSets = list.flatMap { it.sourceSets }.toSet()
             ).mergeExtras(left, right)
         }
-    }
 
     private fun DokkaContext.getDependencyInfo()
             : Map<DokkaConfiguration.DokkaSourceSet, List<DokkaConfiguration.DokkaSourceSet>> {
diff --git a/plugins/base/src/main/kotlin/transformers/documentables/EmptyModulesFilterTransformer.kt b/plugins/base/src/main/kotlin/transformers/documentables/EmptyModulesFilterTransformer.kt
new file mode 100644
index 00000000..fa31c5c3
--- /dev/null
+++ b/plugins/base/src/main/kotlin/transformers/documentables/EmptyModulesFilterTransformer.kt
@@ -0,0 +1,10 @@
+package org.jetbrains.dokka.base.transformers.documentables
+
+import org.jetbrains.dokka.model.DModule
+import org.jetbrains.dokka.transformers.documentation.PreMergeDocumentableTransformer
+
+class EmptyModulesFilterTransformer : PreMergeDocumentableTransformer {
+    override fun invoke(modules: List<DModule>): List<DModule> {
+        return modules.filter { it.children.isNotEmpty() }
+    }
+}
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