From 6ade0b002d7ab59a1fa34e93e7805b7a87e8dbc7 Mon Sep 17 00:00:00 2001
From: Alexandre Senges <alexandre@senges.ch>
Date: Tue, 15 Aug 2023 10:26:34 +0000
Subject: [PATCH] Create solution attribute for details

---
 speaker-notes.js                   | 15 +++++++++++----
 src/exercises/day-2/binary-tree.md |  6 +++---
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/speaker-notes.js b/speaker-notes.js
index a3a7d210..22eb6dda 100644
--- a/speaker-notes.js
+++ b/speaker-notes.js
@@ -128,11 +128,18 @@
   // Create headers on the print page.
   function setupPrintPage() {
     for (const notes of document.querySelectorAll("details")) {
-      notes.open = true;
-      let summary = document.createElement("summary");
+      let summaryContent;
+      if (notes.getAttribute("solution") !== null) {
+        notes.open = false;
+        summaryContent = "Solution";
+      } else {
+        notes.open = true;
+        summaryContent = "Speaker Notes";
+      }
+      const summary = document.createElement("summary");
       notes.insertBefore(summary, notes.firstChild);
-      let h4 = document.createElement("h4");
-      h4.append("Speaker Notes");
+      const h4 = document.createElement("h4");
+      h4.append(summaryContent);
       summary.append(h4);
     }
   }
diff --git a/src/exercises/day-2/binary-tree.md b/src/exercises/day-2/binary-tree.md
index 85f9cbba..88f26524 100644
--- a/src/exercises/day-2/binary-tree.md
+++ b/src/exercises/day-2/binary-tree.md
@@ -15,7 +15,7 @@ enum Side {
 
 Using the data structures in the standard library, how can we represent such a Binary Tree in Rust?
 
-<details open=false>
+<details solution>
 
 ```rust
 #[derive(Debug)]
@@ -30,7 +30,7 @@ struct BinaryTree {
 
 Let's now write a method to to create a BinaryTree with arbitrary depth:
 
-<details open=false>
+<details solution>
 
 ```rust
 use Side::*;
@@ -57,7 +57,7 @@ Let's now write a method to invert the tree. To make sure that the tree is inver
 left nodes values should now be `Right` and right nodes values should now be `Left`.
 
 
-<details open=false>
+<details solution>
 
 ```rust
 use Side::*;