From 3bf0200e7efb79bd47c3d5c3a174a5b6154316f6 Mon Sep 17 00:00:00 2001
From: Michael Zhang <mail@mzhang.io>
Date: Fri, 1 Sep 2023 12:38:59 -0500
Subject: [PATCH] wip toc

---
 src/components/TocWrapper.astro               | 41 +++++++++++
 src/content/config.ts                         |  1 +
 .../index.md                                  |  1 +
 src/pages/posts/[...slug].astro               | 73 ++++++++++---------
 src/styles/global.scss                        |  6 +-
 src/styles/post.scss                          | 11 +++
 src/styles/toc.scss                           | 44 +++++++++++
 7 files changed, 138 insertions(+), 39 deletions(-)
 create mode 100644 src/components/TocWrapper.astro
 create mode 100644 src/styles/toc.scss

diff --git a/src/components/TocWrapper.astro b/src/components/TocWrapper.astro
new file mode 100644
index 0000000..fa292c0
--- /dev/null
+++ b/src/components/TocWrapper.astro
@@ -0,0 +1,41 @@
+---
+import type { MarkdownHeading } from "astro";
+import "../styles/toc.scss";
+
+interface Props {
+  toc: boolean;
+  headings: MarkdownHeading[];
+}
+
+const { toc, headings } = Astro.props;
+---
+
+{
+  toc ? (
+    <>
+      <div class="toc-wrapper">
+        <slot />
+        <div class="toc">
+          Table of contents
+          <ul>
+            {headings.map((heading) => {
+              return (
+                <li>
+                  <a href={`#${heading.slug}`}>{heading.text}</a>
+                </li>
+              );
+            })}
+          </ul>
+        </div>
+      </div>
+    </>
+  ) : (
+    <slot />
+  )
+}
+
+<script type="text/javascript">
+  document.addEventListener("scroll", (doc, evt) => {
+    console.log("SHIET");
+  });
+</script>
diff --git a/src/content/config.ts b/src/content/config.ts
index 9563b52..3afe8c9 100644
--- a/src/content/config.ts
+++ b/src/content/config.ts
@@ -27,6 +27,7 @@ const posts = defineCollection({
       tags: z.array(z.string()),
       draft: z.boolean().default(false),
       math: z.boolean().default(false),
+      toc: z.boolean().default(false),
     }),
 });
 
diff --git a/src/content/posts/2023-09-01-formal-cek-machine-in-agda/index.md b/src/content/posts/2023-09-01-formal-cek-machine-in-agda/index.md
index 14ff529..e33076d 100644
--- a/src/content/posts/2023-09-01-formal-cek-machine-in-agda/index.md
+++ b/src/content/posts/2023-09-01-formal-cek-machine-in-agda/index.md
@@ -11,6 +11,7 @@ tags:
 heroImage: ./header.jpg
 heroAlt: gears spinning wallpaper
 math: true
+toc: true
 ---
 
 Back in 2022, I took a special topics course, CSCI 8980, on [reasoning about
diff --git a/src/pages/posts/[...slug].astro b/src/pages/posts/[...slug].astro
index fd936ff..3a5ac30 100644
--- a/src/pages/posts/[...slug].astro
+++ b/src/pages/posts/[...slug].astro
@@ -4,6 +4,7 @@ import BaseLayout from "../../layouts/BaseLayout.astro";
 import { type CollectionEntry, getCollection } from "astro:content";
 import Timestamp from "../../components/Timestamp.astro";
 import { getImage } from "astro:assets";
+import TocWrapper from "../../components/TocWrapper.astro";
 
 export async function getStaticPaths() {
   const posts = await getCollection("posts");
@@ -16,8 +17,8 @@ export async function getStaticPaths() {
 type Props = CollectionEntry<"posts">;
 
 const post = Astro.props;
-const { Content, remarkPluginFrontmatter } = await post.render();
-const { heroImage: heroImagePath, heroAlt } = post.data;
+const { Content, remarkPluginFrontmatter, headings } = await post.render();
+const { toc, heroImage: heroImagePath, heroAlt } = post.data;
 
 let heroImage;
 if (heroImagePath) {
@@ -44,44 +45,44 @@ const datestamp = post.data.date.toLocaleDateString(undefined, {
   <meta slot="head" property="article:published_time" content={datestamp} />
   <meta slot="head" property="article:author" content="Michael Zhang" />
 
-  <div class="post-container">
-    <h1 class="post-title">{post.data.title}</h1>
+  <TocWrapper toc={toc} headings={headings}>
+    <div class="post-container">
+      <h1 class="post-title">{post.data.title}</h1>
+
+      <span class="tags">
+        {
+          post.data.draft && (
+            <a href="/drafts" class="tag draft">
+              <i class="fa fa-warning" aria-hidden="true" />
+              <span class="text">draft</span>
+            </a>
+          )
+        }
+
+        {
+          post.data.tags.map((tag) => (
+            <a href={`/tags/${tag}`} class="tag">
+              <i class="fa fa-tag" aria-hidden="true" />
+              <span class="text">{tag}</span>
+            </a>
+          ))
+        }
+      </span>
+
+      <small class="post-meta">
+        Posted on <Timestamp timestamp={post.data.date} />
+         - {remarkPluginFrontmatter.minutesRead}
+      </small>
 
-    <span class="tags">
       {
-        post.data.draft && (
-          <a href="/drafts" class="tag draft">
-            <i class="fa fa-warning" aria-hidden="true" />
-            <span class="text">draft</span>
-          </a>
+        heroImage && heroAlt && (
+          <div style={`background-image: url(${heroImage.src});`} title={heroAlt} class="hero" />
         )
       }
 
-      {
-        post.data.tags.map((tag) => (
-          <a href={`/tags/${tag}`} class="tag">
-            <i class="fa fa-tag" aria-hidden="true" />
-            <span class="text">{tag}</span>
-          </a>
-        ))
-      }
-    </span>
-
-    <small class="post-meta">
-      Posted on <Timestamp timestamp={post.data.date} />
-       - {remarkPluginFrontmatter.minutesRead}
-    </small>
-
-    {
-      heroImage && heroAlt && (
-        <div style={`background-image: url(${heroImage.src});`} title={heroAlt} class="hero" />
-      )
-    }
-
-    <!-- <BlogPost {...post.data}> -->
-    <div class="post-content">
-      <Content />
+      <div class="post-content">
+        <Content />
+      </div>
     </div>
-  </div>
-  <!-- </BlogPost> -->
+  </TocWrapper>
 </BaseLayout>
diff --git a/src/styles/global.scss b/src/styles/global.scss
index 5b59432..5d63daa 100644
--- a/src/styles/global.scss
+++ b/src/styles/global.scss
@@ -12,7 +12,6 @@ body {
   background-color: var(--background-color);
   color: var(--text-color);
 
-  max-width: 1024px;
   margin: auto;
   width: 100%;
   height: 1px;
@@ -94,12 +93,13 @@ pre > code {
   display: flex;
   flex-direction: row;
   align-items: stretch;
+  justify-content: center;
 }
 
 .flex-wrapper > main {
   min-width: 0;
   box-sizing: border-box;
-  padding: 20px;
+  // padding: 20px;
 }
 
 @media screen and (max-width: variables.$breakpoint) {
@@ -120,6 +120,6 @@ pre > code {
   }
 
   .flex-wrapper > main {
-    padding-left: 30px;
+    // padding-left: 30px;
   }
 }
diff --git a/src/styles/post.scss b/src/styles/post.scss
index c715fbe..19e7f6b 100644
--- a/src/styles/post.scss
+++ b/src/styles/post.scss
@@ -1,3 +1,5 @@
+@use "variables";
+
 .post-title {
   font-size: 2rem;
   font-weight: 600;
@@ -20,7 +22,9 @@
 }
 
 .post-container {
+  max-width: 720px;
   display: flex;
+  padding: 20px;
 
   flex-direction: column;
   .toc-drawer {
@@ -175,6 +179,12 @@
   }
 }
 
+@media screen and (min-width: variables.$breakpoint) {
+  .post-container {
+    padding-left: 30px;
+  }
+}
+
 .division .post-content,
 .post-content {
   .heading {
@@ -210,6 +220,7 @@ hr.endline {
   display: flex;
   gap: 6px;
   margin-bottom: 6px;
+  flex-wrap: wrap;
 
   .tag {
     font-size: 0.75rem;
diff --git a/src/styles/toc.scss b/src/styles/toc.scss
new file mode 100644
index 0000000..3e8fbde
--- /dev/null
+++ b/src/styles/toc.scss
@@ -0,0 +1,44 @@
+@use "variables";
+$tocWidth: 180px;
+$tocBreakpoint: variables.$breakpoint + $tocWidth;
+
+.toc-wrapper {
+  position: relative;
+  display: flex;
+}
+
+.toc {
+  height: 100vh;
+
+  ul {
+    list-style-type: none;
+    padding-inline-start: 0;
+
+    li {
+      font-size: 14px;
+    }
+  }
+}
+
+@media screen and (max-width: $tocBreakpoint) {
+  .toc {
+    display: none;
+  }
+}
+
+@media screen and (min-width: $tocBreakpoint) {
+  .article {
+    flex-grow: 1;
+  }
+
+  .toc {
+    flex: 0 0 $tocWidth;
+    max-width: $tocWidth;
+
+    position: sticky;
+    top: 0;
+    padding: 20px;
+
+    overflow-y: auto;
+  }
+}