1 files changed, 30 insertions, 0 deletions
diff --git a/src/Formats/OutlineService.kt b/src/Formats/OutlineService.kt
new file mode 100644
index 00000000..db1adf3d
--- /dev/null
+++ b/src/Formats/OutlineService.kt
@@ -0,0 +1,30 @@
+package org.jetbrains.dokka
+
+import java.io.File
+
+/**
+ * Service for building the outline of the package contents.
+ */
+public trait OutlineFormatService {
+    fun getOutlineFileName(location: Location): File
+
+    public fun appendOutlineHeader(location: Location, node: DocumentationNode, to: StringBuilder)
+    public fun appendOutlineLevel(to: StringBuilder, body: () -> Unit)
+
+    /** Appends formatted outline to [StringBuilder](to) using specified [location] */
+    public fun appendOutline(location: Location, to: StringBuilder, nodes: Iterable<DocumentationNode>) {
+        for (node in nodes) {
+            appendOutlineHeader(location, node, to)
+            if (node.members.any()) {
+                val sortedMembers = node.members.sortBy { it.name }
+                appendOutlineLevel(to) {
+                    appendOutline(location, to, sortedMembers)
+                }
+            }
+            to.appendln()
+        }
+    }
+
+    fun formatOutline(location: Location, nodes: Iterable<DocumentationNode>): String =
+            StringBuilder { appendOutline(location, this, nodes) }.toString()
+}