From 0519291bda1f0c168ed0878f271e2c1887f3c05f Mon Sep 17 00:00:00 2001
From: Joseph Montanaro <jfmonty2@gmail.com>
Date: Fri, 25 Aug 2023 22:22:39 -0700
Subject: [PATCH] limit toc to two levels and vary style

---
 src/lib/Toc.svelte | 67 ++++++++++++++++++++++++++++++++--------------
 1 file changed, 47 insertions(+), 20 deletions(-)

diff --git a/src/lib/Toc.svelte b/src/lib/Toc.svelte
index 65ada56..276b28e 100644
--- a/src/lib/Toc.svelte
+++ b/src/lib/Toc.svelte
@@ -6,15 +6,23 @@
 
     items.forEach(i => i.slug = makeSlug(i.text));
 
-    const selector = 'h1[id], h2[id], h3[id], h4[id], h6[id]';
+    const selector = 'h2[id], h3[id]';
     let currentHeadingSlug = null;
+    let currentSubheadingSlug = null;
     function setCurrentHeading() {
         for (const h of document.querySelectorAll(selector)) {
             const yPos = h.getBoundingClientRect().y;
             if (yPos > (window.innerHeight / 3)) {
                 break;
             }
-            currentHeadingSlug = h.id;
+            if (h.tagName === 'H2') {
+                currentHeadingSlug = h.id;
+                currentSubheadingSlug = null;
+            }
+            if (h.tagName === 'H3') {
+                currentSubheadingSlug = h.id
+            }
+        console.log(currentHeadingSlug, currentSubheadingSlug);
         }
     }
 
@@ -26,7 +34,6 @@
 
 
 <style>
-    /* move everything out to the left and center it vertically */
     #toc {
         position: sticky;
         top: 1.5rem;
@@ -69,22 +76,37 @@
         list-style: none;
     }
 
-    /* margin for indentation, padding so that the accent bar for the current 
-    item isn't right on top of it */
+    /* margin for indentation */
     li {
-        margin-left: var(--indent, 0);
-        padding-left: 0.5rem;
-        margin-bottom: 0.15rem;
+        display: flex;
         font-size: 0.9rem;
-        border-left: 0.1rem solid transparent;
     }
-    li:hover {
-        color: var(--content-color);
-        border-left: 0.1rem solid var(--accent-color);
+    li.depth-2 {
+        align-items: stretch;
+        margin-bottom: 0.2rem;
     }
-    li.current {
+    li.depth-3 {
+        align-items: center;
+        margin-bottom: 0.05rem;
+    }
+
+    .marker {
+        margin-right: 0.5rem;
+    }
+    .bar {
+        width: 0.1rem;
+    }
+    .dot {
+        width: 0.15rem;
+        height: 0.15rem;
+        border-radius: 50%;
+    }
+
+    li.current, li:hover {
         color: var(--content-color);
-        border-left: 0.1rem solid var(--accent-color);
+    }
+    .current .marker, li:hover .marker {
+        background-color: var(--accent-color);
     }
 
     a {
@@ -100,12 +122,17 @@
     </h5>
     <ul>
         {#each items as item}
-        <li 
-            style:--indent="{(item.depth - 2) * 0.75}em"
-            class:current={item.slug === currentHeadingSlug}
-        >
-            <a href="#{item.slug}">{item.text}</a>
-        </li>
+            {#if item.depth === 2}
+                <li class="depth-2" class:current={item.slug === currentHeadingSlug} style:align-items="stretch">
+                    <span class="marker bar"></span>
+                    <a href="#{item.slug}">{item.text}</a>
+                </li>
+            {:else if item.depth === 3}
+                <li class="depth-3" class:current={item.slug === currentSubheadingSlug} style:align-items="center" style:margin-left="0.75em">
+                    <span class="marker dot"></span>
+                    <a href="#{item.slug}">{item.text}</a>
+                </li>
+            {/if}
         {/each}
     </ul>
 </div>
\ No newline at end of file