1 files changed, 61 insertions, 0 deletions
diff --git a/dokka-runners/dokkatoo/modules/dokkatoo-plugin/src/testFixtures/kotlin/fileTree.kt b/dokka-runners/dokkatoo/modules/dokkatoo-plugin/src/testFixtures/kotlin/fileTree.kt
new file mode 100644
index 00000000..4ba850d3
--- /dev/null
+++ b/dokka-runners/dokkatoo/modules/dokkatoo-plugin/src/testFixtures/kotlin/fileTree.kt
@@ -0,0 +1,61 @@
+package org.jetbrains.dokka.dokkatoo.utils
+
+import java.io.File
+import java.nio.file.Path
+
+// based on https://gist.github.com/mfwgenerics/d1ec89eb80c95da9d542a03b49b5e15b
+// context: https://kotlinlang.slack.com/archives/C0B8MA7FA/p1676106647658099
+
+fun Path.toTreeString(): String = toFile().toTreeString()
+
+fun File.toTreeString(): String = when {
+  isDirectory -> name + "/\n" + buildTreeString(this)
+  else        -> name
+}
+
+private fun buildTreeString(
+  dir: File,
+  margin: String = "",
+): String {
+  val entries = dir.listDirectoryEntries()
+
+  return entries.joinToString("\n") { entry ->
+    val (currentPrefix, nextPrefix) = when (entry) {
+      entries.last() -> PrefixPair.LAST_ENTRY
+      else           -> PrefixPair.INTERMEDIATE
+    }
+
+    buildString {
+      append("$margin${currentPrefix}${entry.name}")
+
+      if (entry.isDirectory) {
+        append("/")
+        if (entry.countDirectoryEntries() > 0) {
+          append("\n")
+        }
+        append(buildTreeString(entry, margin + nextPrefix))
+      }
+    }
+  }
+}
+
+private fun File.listDirectoryEntries(): Sequence<File> =
+  walkTopDown().maxDepth(1).filter { it != this@listDirectoryEntries }
+
+
+private fun File.countDirectoryEntries(): Int =
+  listDirectoryEntries().count()
+
+private data class PrefixPair(
+  /** The current entry should be prefixed with this */
+  val currentPrefix: String,
+  /** If the next item is a directory, it should be prefixed with this */
+  val nextPrefix: String,
+) {
+  companion object {
+    /** Prefix pair for a non-last directory entry */
+    val INTERMEDIATE = PrefixPair("├── ", "│   ")
+    /** Prefix pair for the last directory entry */
+    val LAST_ENTRY = PrefixPair("└── ", "    ")
+  }
+}