newsfeed

content/treehouse/new.tree

@@ -0,0 +1,11 @@
+%% template = "_new.hbs"
+   title = "a curated feed of updates to the house"
+   styles = ["new.css"]
+   feed = "news"
+
+% id = "01HQ6G30PTVT5H0Z04VVRHEZQF"
+- ever wondered how Terraria renders its worlds? or how editors like Tiled manage to make painting tiles so easy?
+
+### tairu - an interactive exploration of 2D autotiling techniques
+
+[read][page:programming/blog/tairu]

crates/treehouse/src/cli/generate.rs

@@ -43,6 +43,40 @@ struct ParsedTree {
     target_path: PathBuf,
 }
 
+#[derive(Serialize)]
+struct Feed {
+    branches: Vec<String>,
+}
+
+#[derive(Serialize)]
+pub struct Page {
+    pub title: String,
+    pub thumbnail: Option<Thumbnail>,
+    pub scripts: Vec<String>,
+    pub styles: Vec<String>,
+    pub breadcrumbs: String,
+    pub tree_path: Option<String>,
+    pub tree: String,
+}
+
+#[derive(Serialize)]
+pub struct Thumbnail {
+    pub url: String,
+    pub alt: Option<String>,
+}
+
+#[derive(Serialize)]
+struct StaticTemplateData<'a> {
+    config: &'a Config,
+}
+
+#[derive(Serialize)]
+pub struct PageTemplateData<'a> {
+    pub config: &'a Config,
+    pub page: Page,
+    pub feeds: &'a HashMap<String, Feed>,
+}
+
 impl Generator {
     fn add_directory_rec(&mut self, directory: &Path) -> anyhow::Result<()> {
         for entry in WalkDir::new(directory) {
@@ -172,14 +206,14 @@ impl Generator {
         config: &Config,
         paths: &Paths<'_>,
         navigation_map: &NavigationMap,
-        parsed_trees: impl IntoIterator<Item = ParsedTree>,
+        parsed_trees: Vec<ParsedTree>,
     ) -> anyhow::Result<()> {
         let mut handlebars = Handlebars::new();
         let mut config_derived_data = ConfigDerivedData::default();
 
         let mut template_file_ids = HashMap::new();
         for entry in WalkDir::new(paths.template_dir) {
-            let entry = entry?;
+            let entry = entry.context("cannot read directory entry")?;
             let path = entry.path();
             if !entry.file_type().is_dir() && path.extension() == Some(OsStr::new("hbs")) {
                 let relative_path = path
@@ -194,12 +228,8 @@ impl Generator {
 
         std::fs::create_dir_all(paths.template_target_dir)?;
         for (name, &file_id) in &template_file_ids {
-            if !name.starts_with('_') {
-                #[derive(Serialize)]
-                struct StaticTemplateData<'a> {
-                    config: &'a Config,
-                }
-
+            let filename = name.rsplit_once('/').unwrap_or(("", name)).1;
+            if !filename.starts_with('_') {
                 let templated_html = match handlebars.render(name, &StaticTemplateData { config }) {
                     Ok(html) => html,
                     Err(error) => {
@@ -220,6 +250,24 @@ impl Generator {
             }
         }
 
+        let mut feeds = HashMap::new();
+
+        for parsed_tree in &parsed_trees {
+            let roots = &treehouse.roots[&parsed_tree.tree_path];
+
+            if let Some(feed_name) = &roots.attributes.feed {
+                let mut feed = Feed {
+                    branches: Vec::new(),
+                };
+                for &root in &roots.branches {
+                    let branch = treehouse.tree.branch(root);
+                    feed.branches.push(branch.attributes.id.clone());
+                }
+                dbg!(&feed.branches);
+                feeds.insert(feed_name.to_owned(), feed);
+            }
+        }
+
         for parsed_tree in parsed_trees {
             let breadcrumbs = breadcrumbs_to_html(config, navigation_map, &parsed_tree.tree_path);
 
@@ -238,28 +286,6 @@ impl Generator {
                 &roots.branches,
             );
 
-            #[derive(Serialize)]
-            pub struct Page {
-                pub title: String,
-                pub thumbnail: Option<Thumbnail>,
-                pub scripts: Vec<String>,
-                pub styles: Vec<String>,
-                pub breadcrumbs: String,
-                pub tree_path: Option<String>,
-                pub tree: String,
-            }
-
-            #[derive(Serialize)]
-            pub struct Thumbnail {
-                pub url: String,
-                pub alt: Option<String>,
-            }
-
-            #[derive(Serialize)]
-            pub struct PageTemplateData<'a> {
-                pub config: &'a Config,
-                pub page: Page,
-            }
             let template_data = PageTemplateData {
                 config,
                 page: Page {
@@ -280,16 +306,22 @@ impl Generator {
                         .map(|s| s.to_owned()),
                     tree,
                 },
+                feeds: &feeds,
             };
+            let template_name = roots
+                .attributes
+                .template
+                .clone()
+                .unwrap_or_else(|| "_tree.hbs".into());
 
             treehouse.roots.insert(parsed_tree.tree_path, roots);
 
-            let templated_html = match handlebars.render("_tree.hbs", &template_data) {
+            let templated_html = match handlebars.render(&template_name, &template_data) {
                 Ok(html) => html,
                 Err(error) => {
                     Self::wrangle_handlebars_error_into_diagnostic(
                         treehouse,
-                        template_file_ids["_tree.hbs"],
+                        template_file_ids[&template_name],
                         error.line_no,
                         error.column_no,
                         error.desc,

crates/treehouse/src/html/tree.rs

@@ -114,15 +114,22 @@ pub fn branch_to_html(
                             .map(|&branch_id| {
                                 (
                                     format!(
-                                        "/b?{}",
+                                        "{}/b?{}",
+                                        config.site,
                                         treehouse.tree.branch(branch_id).attributes.id
                                     )
                                     .into(),
                                     "".into(),
                                 )
                             }),
+                        "page" => {
+                            Some((format!("{}/{}.html", config.site, linked).into(), "".into()))
+                        }
                         "pic" => config.pics.get(linked).map(|filename| {
-                            (format!("/static/pic/{}", &filename).into(), "".into())
+                            (
+                                format!("{}/static/pic/{}", config.site, &filename).into(),
+                                "".into(),
+                            )
                         }),
                         _ => None,
                     })

crates/treehouse/src/tree/attributes.rs

@@ -3,6 +3,11 @@ use serde::{Deserialize, Serialize};
 /// Top-level `%%` root attributes.
 #[derive(Debug, Default, Clone, PartialEq, Eq, Deserialize, Serialize)]
 pub struct RootAttributes {
+    /// Template to use for generating the page.
+    /// Defaults to `_tree.hbs`.
+    #[serde(default)]
+    pub template: Option<String>,
+
     /// Title of the generated .html page.
     ///
     /// The page's tree path is used if empty.
@@ -26,6 +31,11 @@ pub struct RootAttributes {
     /// These are relative to the /static/css directory.
     #[serde(default)]
     pub styles: Vec<String>,
+
+    /// When specified, branches coming from this root will be added to a _feed_ with the given name.
+    /// Feeds can be read by Handlebars templates to generate content based on them.
+    #[serde(default)]
+    pub feed: Option<String>,
 }
 
 /// A picture reference.

static/css/main.css

@@ -369,6 +369,16 @@ th {
     --recursive-casl: 0.5;
 }
 
+/* Horizontal rules */
+
+hr {
+    width: 100%;
+    border: none;
+    border-top: 1px solid var(--border-1);
+    margin-top: 2em;
+    margin-bottom: 2em;
+}
+
 /* Style the noscript box a little more prettily. */
 
 .noscript {
@@ -413,6 +423,7 @@ nav {
 
 nav .nav-page {
     display: flex;
+    flex-grow: 1;
     flex-direction: column;
 }
 
@@ -435,8 +446,49 @@ h1.page-title {
     font-size: 1.25rem;
 }
 
-/* Style the footer */
+/* Style the `new` link on the homepage */
+a[is="th-new"] {
+    flex-shrink: 0;
+    color: var(--text-color);
+    opacity: 50%;
 
+    &.has-news {
+        opacity: 100%;
+        text-decoration: none;
+
+        & .new-text {
+            text-decoration: underline;
+        }
+    }
+
+    & .badge {
+        margin-left: 8px;
+        text-decoration: none;
+    }
+}
+
+/* Style new badges */
+span.badge {
+    --recursive-wght: 800;
+    --recursive-slnt: 0;
+    --recursive-mono: 1.0;
+    --recursive-casl: 0;
+
+    border-radius: 999px;
+    padding: 2px 6px;
+    font-size: 0.9em;
+
+    &.red {
+        color: white;
+        background-color: #d01243;
+    }
+
+    &.before-content {
+        margin-right: 6px;
+    }
+}
+
+/* Style the footer */
 footer {
     margin-top: 4rem;
     text-align: right;
@@ -561,6 +613,9 @@ th-literate-program[data-mode="output"] {
         border-style: none;
         border-radius: 4px;
         display: block;
+    }
+
+    & img.placeholder.js {
         transition: opacity var(--transition-duration);
     }
 
@@ -709,3 +764,11 @@ th-literate-program[data-mode="output"] {
         }
     }
 }
+
+/* Style settings sections */
+
+section[is="th-settings"] {
+    /* Don't display settings when JavaScript is disabled.
+       JS overrides this value on the element itself. */
+    display: none;
+}

static/css/new.css

@@ -0,0 +1,103 @@
+/* Give the intro and outro some breathing room. */
+section {
+    padding: 1em 2em;
+}
+
+/* Style all links in the last paragraph as big buttons. */
+.tree th-bc>p:last-child {
+    --transition-duration: 0.2s;
+
+    margin-top: 12px;
+    margin-bottom: 4px;
+
+    &>a {
+        padding: 0.5em 1.5em;
+
+        color: var(--text-color);
+        background-color: transparent;
+        border: 1px solid var(--border-1);
+        border-radius: 2em;
+        text-decoration: none;
+
+        transition:
+            color var(--transition-duration),
+            background-color var(--transition-duration),
+            border-color var(--transition-duration);
+
+        &:hover,
+        &:focus {
+            color: white;
+            background-color: #058ef0;
+            border-color: white;
+        }
+    }
+}
+
+section[is="th-settings"] {
+    & h3 {
+        display: inline;
+    }
+
+    & details>summary {
+        --recursive-wght: 700;
+
+        list-style: none;
+        cursor: pointer;
+
+        opacity: 50%;
+        transition: opacity var(--transition-duration);
+
+        &::-webkit-details-marker {
+            display: none;
+        }
+
+        &::before {
+            --recursive-casl: 0.0;
+            --recursive-mono: 1.0;
+            --recursive-slnt: 0.0;
+
+            content: '+';
+            margin-right: 0.3em;
+
+            opacity: 50%;
+        }
+
+        &:hover {
+            opacity: 100%;
+        }
+    }
+
+    & details[open]>summary {
+        opacity: 100%;
+
+        &::before {
+            content: '-';
+        }
+    }
+
+    & p {
+        margin-bottom: 8px;
+    }
+
+    & button {
+        border: 1px solid var(--border-1);
+        border-radius: 999px;
+        padding: 4px 12px;
+        background: none;
+        color: var(--text-color);
+        font-size: 1rem;
+
+        cursor: pointer;
+
+        transition:
+            color var(--transition-duration),
+            background-color var(--transition-duration),
+            border-color var(--transition-duration);
+
+        &:hover {
+            color: white;
+            background-color: #058ef0;
+            border-color: white;
+        }
+    }
+}

static/js/components/literate-programming.js

@@ -184,6 +184,7 @@ class OutputMode {
         });
 
         if (this.frame.placeholderImage != null) {
+            this.frame.placeholderImage.classList.add("js");
             this.frame.placeholderImage.classList.add("loading");
         }
 

static/js/news.js

@@ -0,0 +1,70 @@
+// news.js because new.js makes the TypeScript language server flip out.
+// Likely because `new` is a keyword, but also, what the fuck.
+
+import { getSettingValue } from "./settings.js";
+import { Branch } from "./tree.js";
+
+const seenStatesKey = "treehouse.news.seenBranches";
+const seenStates = new Set(JSON.parse(localStorage.getItem(seenStatesKey)) || []);
+
+let seenCount = seenStates.size;
+let unseenCount = TREEHOUSE_NEWS_COUNT - seenCount;
+
+function saveSeenStates() {
+    localStorage.setItem(seenStatesKey, JSON.stringify(Array.from(seenStates)));
+}
+
+function markAsRead(branch) {
+    if (!seenStates.has(branch.namedID) && seenCount > 0) {
+        let badge = document.createElement("span");
+        badge.classList.add("badge", "red", "before-content");
+        badge.textContent = "new";
+
+        branch.branchContent.firstChild.insertBefore(badge, branch.branchContent.firstChild.firstChild);
+    }
+
+    seenStates.add(branch.namedID);
+}
+
+export function initNewsPage() {
+    for (let [_, branch] of Branch.branchesByNamedID) {
+        markAsRead(branch);
+    }
+    saveSeenStates();
+
+    // If any branches are added past the initial load, add them to the seen set too.
+    Branch.onAdded.push(branch => {
+        markAsRead(branch);
+        saveSeenStates();
+    })
+}
+
+export function markAllAsUnread() {
+    localStorage.removeItem(seenStatesKey);
+}
+
+class New extends HTMLAnchorElement {
+    connectedCallback() {
+        // Do not show the badge to people who have never seen any news.
+        // It's just annoying in that case.
+        // In case you do not wish to see the badge anymore, go to the news page and uncheck the
+        // checkbox at the bottom.
+        let userSawNews = seenCount > 0;
+        let userWantsToSeeNews = getSettingValue("showNewPostIndicator");
+        if (userSawNews && userWantsToSeeNews && unseenCount > 0) {
+            this.newText = document.createElement("span");
+            this.newText.classList.add("new-text");
+            this.newText.textContent = this.textContent;
+            this.textContent = "";
+            this.appendChild(this.newText);
+
+            this.badge = document.createElement("span");
+            this.badge.classList.add("badge", "red");
+            this.badge.textContent = unseenCount.toString();
+            this.appendChild(this.badge);
+            this.classList.add("has-news");
+        }
+    }
+}
+
+customElements.define("th-new", New, { extends: "a" });

static/js/settings.js

@@ -0,0 +1,35 @@
+const settingsKey = "treehouse.settings";
+const settings = JSON.parse(localStorage.getItem(settingsKey)) || {};
+
+const defaultSettingValues = {
+    showNewPostIndicator: true,
+};
+
+function saveSettings() {
+    localStorage.setItem(settingsKey, JSON.stringify(settings));
+}
+
+export function getSettingValue(setting) {
+    return settings[setting] ?? defaultSettingValues[setting];
+}
+
+class SettingCheckbox extends HTMLInputElement {
+    connectedCallback() {
+        this.checked = getSettingValue(this.id);
+
+        this.addEventListener("change", () => {
+            settings[this.id] = this.checked;
+            saveSettings();
+        });
+    }
+}
+
+customElements.define("th-setting-checkbox", SettingCheckbox, { extends: "input" });
+
+class Settings extends HTMLElement {
+    connectedCallback() {
+        this.style.display = "block";
+    }
+}
+
+customElements.define("th-settings", Settings, { extends: "section" });

static/js/thanks-webkit.js

@@ -1,5 +1,5 @@
 // Detect if we can have crucial functionality (ie. custom elements call constructors).
-// This doesn't seem to happen in Epiphany, and possibly also other Webkit-based browsers.
+// This doesn't seem to happen in Epiphany, and also other Webkit-based browsers.
 let works = false;
 class WebkitMoment extends HTMLLIElement {
     constructor() {

static/js/tree.js

@@ -17,12 +17,11 @@ function branchIsOpen(branchID) {
     return branchState[branchID];
 }
 
-class Branch extends HTMLLIElement {
+export class Branch extends HTMLLIElement {
     static branchesByNamedID = new Map();
+    static onAdded = [];
 
-    constructor() {
-        super();
-
+    connectedCallback() {
         this.isLeaf = this.classList.contains("leaf");
 
         this.details = this.childNodes[0];
@@ -48,16 +47,20 @@ class Branch extends HTMLLIElement {
             });
         }
 
-        let namedID = this.id.split(':')[1];
-        Branch.branchesByNamedID.set(namedID, this);
+        this.namedID = this.id.split(':')[1];
+        Branch.branchesByNamedID.set(this.namedID, this);
 
-        if (ulid.isCanonicalUlid(namedID)) {
-            let timestamp = ulid.getTimestamp(namedID);
+        if (ulid.isCanonicalUlid(this.namedID)) {
+            let timestamp = ulid.getTimestamp(this.namedID);
             let date = document.createElement("span");
             date.classList.add("branch-date");
             date.innerText = timestamp.toLocaleDateString();
             this.buttonBar.insertBefore(date, this.buttonBar.firstChild);
         }
+
+        for (let callback of Branch.onAdded) {
+            callback(this);
+        }
     }
 }
 
@@ -68,8 +71,8 @@ customElements.define("th-b", Branch, { extends: "li" });
 class LinkedBranch extends Branch {
     static byLink = new Map();
 
-    constructor() {
-        super();
+    connectedCallback() {
+        super.connectedCallback();
 
         this.linkedTree = this.getAttribute("data-th-link");
         LinkedBranch.byLink.set(this.linkedTree, this);

template/README.md

@@ -0,0 +1,8 @@
+# Templates
+
+This directory houses Handlebars templates, which are mostly used for reusable bits of the house.
+
+Files that are not prefixed with a `_` are generated into their own `.html` files.
+All other files are only loaded into Handlebars for use by other templates (or the generator itself.)
+
+In particular, `_tree.hbs` is used as the default page template. This can be changed by including a `%% template = "_whatever.hbs"` at the top of your .tree file.

template/_new.hbs

@@ -0,0 +1,77 @@
+<!DOCTYPE html>
+
+<html lang="en-US" prefix="og: https://ogp.me/ns#">
+
+<head>
+    {{> components/_head.hbs }}
+</head>
+
+<body>
+    {{#> components/_nav.hbs }}
+
+    {{!-- For /index, include a "new" link that goes to the curated news feed page. --}}
+    {{#if (eq page.tree_path "index")}}
+    <a href="{{ config.site }}/treehouse/new.html" is="th-new">new</a>
+    {{/if}}
+
+    {{/ components/_nav.hbs }}
+
+    {{> components/_noscript.hbs }}
+    {{> components/_webkit.hbs }}
+
+    <section>
+        <p>welcome!</p>
+        <p>since you clicked here, you must be curious as to what's been going on since your last visit to the house. so
+            here's a recap just for you - enjoy!</p>
+    </section>
+
+    <hr>
+
+    {{> components/_tree.hbs }}
+
+    <hr>
+
+    <section>
+        <p>note that this page does not include any updates that were made to the website itself - for that, you can
+            visit <a href="{{ config.site }}/treehouse/changelog.html">the changelog</a>.
+        </p>
+    </section>
+
+    <section is="th-settings">
+        <details>
+            <summary>
+                settings
+            </summary>
+            <section>
+                <p>if you find the newsfeed annoying, you can customize some aspects of it.</p>
+                <p>
+                    <input type="checkbox" is="th-setting-checkbox" id="showNewPostIndicator">
+                    <label for="showNewPostIndicator">show the <span class="badge red">1</span> badge on the homepage
+                        for
+                        new posts you haven't read yet</label>
+                </p>
+                <p>
+                    <button id="mark-all-as-unread"
+                        title="Mostly useful for debugging purposes, but it's there if you really wanna do it.">
+                        mark all as unread</button>
+                </p>
+            </section>
+        </details>
+    </section>
+
+    {{!-- For all pages except the one linked from the footer, include the footer icon. --}}
+    {{#if (ne page.tree_path "treehouse")}}
+    {{> components/_footer.hbs }}
+    {{/if}}
+
+    <script type="module" defer>
+        import { initNewsPage, markAllAsUnread } from "{{ config.site }}/static/js/news.js";
+        initNewsPage();
+        document.getElementById("mark-all-as-unread").addEventListener("click", () => {
+            markAllAsUnread();
+            alert("congration! you done it");
+        });
+    </script>
+</body>
+
+</html>

template/_tree.hbs

@@ -3,161 +3,31 @@
 <html lang="en-US" prefix="og: https://ogp.me/ns#">
 
 <head>
-    <meta charset="UTF-8">
-
-    <title>{{#if (ne page.title config.user.title)}}{{ page.title }} · {{/if}}{{ config.user.title }}</title>
-
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-
-    <link rel="preload" href="{{ config.site }}/static/font/Recursive_VF_1.085.woff2" as="font" type="font/woff2"
-        crossorigin="anonymous">
-    <link rel="stylesheet" href="{{ config.site }}/static/css/main.css">
-    <link rel="stylesheet" href="{{ config.site }}/static/css/tree.css">
-
-    <script>const TREEHOUSE_SITE = `{{ config.site }}`;</script>
-    <script type="module" src="{{ config.site }}/navmap.js"></script>
-    <script type="module" src="{{ config.site }}/static/js/ulid.js"></script>
-    <script type="module" src="{{ config.site }}/static/js/usability.js"></script>
-    <script type="module" src="{{ config.site }}/static/js/tree.js"></script>
-    <script type="module" src="{{ config.site }}/static/js/emoji.js"></script>
-    <script type="module" src="{{ config.site }}/static/js/thanks-webkit.js"></script>
-
-    <meta property="og:site_name" content="{{ config.user.title }}">
-    <meta property="og:title" content="{{ page.title }}">
-    {{!--
-    This is a bit of a hack to quickly insert metadata into generated pages without going through Handlebars, which
-    would involve registering, parsing, and generating a page from a template.
-    Yes it would be more flexible that way, but it doesn't need to be.
-    It just needs to be a string replacement.
-    --}}
-    <!-- treehouse-ca37057a-cff5-45b3-8415-3b02dbf6c799-per-branch-metadata -->
-    {{#if page.thumbnail}}
-    <meta property="og:image" content="{{ page.thumbnail.url }}">
-    <meta property="og:image:alt" content="{{ page.thumbnail.alt }}">
-    {{/if}}
+    {{> components/_head.hbs }}
 </head>
 
 <body>
-    <nav>
-        <a href="{{ config.site }}/" title="Back to homepage">
-            <svg class="logo" width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-                <path fill-rule="evenodd" clip-rule="evenodd"
-                    d="M8 3H7H6V4V5H4V6H6V9V10H7H10V12H11V10H12H13V9V8V7H12H11H10V8V9H7V6H8H9V5V4V3H8ZM12 9H11V8H12V9ZM7 5V4H8V5H7ZM3 5H2V6H3V5ZM10 13H11V14H10V13Z"
-                    fill="currentColor" />
-            </svg>
-        </a>
+    {{#> components/_nav.hbs }}
 
-        <div class="nav-page">
-            {{#if page.breadcrumbs}}
-            <ol class="breadcrumbs">
-                {{{ page.breadcrumbs }}}
-            </ol>
+    {{!-- For /index, include a "new" link that goes to the curated news feed page. --}}
+    {{#if (eq page.tree_path "index")}}
+    <a href="{{ config.site }}/treehouse/new.html" is="th-new">new</a>
     {{/if}}
 
-            {{#if (and (ne page.title config.user.title) (ne page.title page.tree_path))}}
-            <h1 class="page-title">{{ page.title }}</h1>
-            {{/if}}
-        </div>
-    </nav>
+    {{/ components/_nav.hbs }}
 
-    <noscript>
-        <div class="noscript" role="note">
-            <p>hey! looks like you have <strong>JavaScript disabled.</strong><br>
-                I respect that decision, but you may find the experience of browsing the treehouse… not great.<br>
-                for example, links to branches may not work properly. I cannot do anything about this; it's due to how
-                the <code>&lt;details&gt;</code> element works.<br>
-                (a <code>&lt;details&gt;</code> will not expand itself automatically to reveal the linked element to
-                you.)<br>
-                I did my best to at least keep the site readable in this state, but you can only do so much with plain
-                HTML and CSS.</p>
+    {{> components/_noscript.hbs }}
+    {{> components/_webkit.hbs }}
 
-            <p><strong>Pinky promise this website does not contain any malicious code such as trackers or cryptocurrency
-                    miners.</strong><br>
-                if you don't believe me, you're free to inspect the source yourself! all the scripts are written
-                lovingly in vanilla JS (not minified!) by yours truly ❤️</p>
-            <small>and if this box is annoying, feel free to block it with uBlock Origin or something. I have no
-                way of remembering you closed it, and don't wanna add a database to this website. simplicity
-                rules!</small>
-        </div>
-    </noscript>
+    {{!--
+    NOTE: ~ because components/_tree.hbss must not include any extra indentation, because it may
+    contain pre elements which shouldn't be indented.
+    --}}
+    {{~> components/_tree.hbs }}
 
-    <div id="webkit-makes-me-go-insane" class="noscript" role="note">
-        <p>hey! looks like you're using a weird or otherwise quirky web browser. this basically means, the website will
-            not work for you correctly. I might fix it in the future but I have very limited time to work on this
-            website and so don't have an estimate on when that might happen.</p>
-        <p>in the meantime I suggest switching to <a href="https://firefox.com">something more modern.</a></p>
-        <p>sorry for the inconvenience!</p>
-    </div>
-
-    <main class="tree">
-        {{!-- Append page styles and scripts into the main content, such that they can be inlined
-        into linked branches when those are loaded in. Putting them in the page's head would make
-        extracting them way more painful than it needs to be. --}}
-
-        {{#each page.styles}}
-        <link rel="stylesheet" href="{{ ../config.site }}/static/css/{{ this }}">
-        {{/each}}
-
-        {{#each page.scripts}}
-        <script type="module" src="{{ ../config.site }}/static/js/{{ this }}"></script>
-        {{/each}}
-
-        {{{ page.tree }}}
-    </main>
-
-    <th-emoji-tooltips></th-emoji-tooltips>
-
-    {{#if (ne page.tree_path 'treehouse')}}
-    <footer>
-        <a href="{{ config.site }}/treehouse.html">
-            <svg id="footer-icon" width="32" height="32" viewBox="0 0 32 32" fill="none"
-                xmlns="http://www.w3.org/2000/svg">
-                <g id="all">
-                    <mask id="mask">
-                        <rect width="32" height="32" fill="black" />
-
-                        <clipPath id="treehouse">
-                            <path fill-rule="evenodd" clip-rule="evenodd" fill="white" transform="translate(0 12)"
-                                d="M2.95266 3.95816C2.74074 1.83892 4.40494 0 6.53475 0C8.68036 0 10.3496 1.86501 10.1127 3.9975L10.0568 4.5L10.352 4.37352C11.7717 3.76506 13.316 4.92718 13.1244 6.45988L13.0568 7C14.1537 6.56127 15.3084 7.4907 15.1142 8.65595L15.0449 9.07153C14.7633 10.7614 13.3012 12 11.588 12H4.05892C2.0541 12 0.358966 10.5159 0.0940032 8.52866L0.0241185 8.00452C-0.210422 6.24546 1.30006 4.74903 3.05685 5L2.95266 3.95816ZM4.55685 7H2.55685V8H4.55685V7ZM4.55685 9H2.55685V10H4.55685V9ZM5.55685 7H7.55685V8H5.55685V7ZM7.55685 9H5.55685V10H7.55685V9ZM5.55685 13H7.55685L8.05685 16L9.55685 13H10.5569L9.49201 16.5495C9.21835 17.4617 9.39407 18.4496 9.96549 19.2115L10.5569 20H7.55685V18H6.55685V20H4.55685L5.35542 18.9352C5.80652 18.3338 6.01534 17.5848 5.94053 16.8367L5.55685 13Z" />
-                        </clipPath>
-
-                        <clipPath id="rectangleClip">
-                            <rect id="rectangle1" width="16" height="16" />
-                        </clipPath>
-
-                        <clipPath id="rectangleTreehouseClip" clip-path="url(#treehouse)">
-                            <rect id="rectangle2" width="16" height="16" />
-                        </clipPath>
-
-                        <g transform="translate(3 0)">
-                            <rect width="32" height="32" fill="white" clip-path="url(#treehouse)" />
-                            <rect width="32" height="32" fill="white" clip-path="url(#rectangleClip)" />
-                            <rect width="32" height="32" fill="black" clip-path="url(#rectangleTreehouseClip)" />
-                        </g>
-                    </mask>
-
-                    <rect width="32" height="32" fill="currentColor" mask="url(#mask)" />
-                </g>
-
-                <style>
-                    #rectangle1,
-                    #rectangle2 {
-                        transform: translate(16px, 12px) rotate(15deg) translate(-8px, -8px);
-                        rx: 0px;
-                        transition: all 1s;
-                    }
-
-                    #all:hover #rectangle1,
-                    #all:hover #rectangle2 {
-                        transform: translate(22px, 24px) rotate(360deg) translate(-2px, -2px);
-                        width: 4px;
-                        height: 4px;
-                        rx: 4px;
-                    }
-                </style>
-            </svg>
-        </a>
-    </footer>
+    {{!-- For all pages except the one linked from the footer, include the footer icon. --}}
+    {{#if (ne page.tree_path "treehouse")}}
+    {{> components/_footer.hbs }}
     {{/if}}
 </body>
 

template/components/_footer.hbs

@@ -0,0 +1,49 @@
+<footer>
+    <a href="{{ config.site }}/treehouse.html">
+        <svg id="footer-icon" width="32" height="32" viewBox="0 0 32 32" fill="none" xmlns="http://www.w3.org/2000/svg">
+            <g id="all">
+                <mask id="mask">
+                    <rect width="32" height="32" fill="black" />
+
+                    <clipPath id="treehouse">
+                        <path fill-rule="evenodd" clip-rule="evenodd" fill="white" transform="translate(0 12)"
+                            d="M2.95266 3.95816C2.74074 1.83892 4.40494 0 6.53475 0C8.68036 0 10.3496 1.86501 10.1127 3.9975L10.0568 4.5L10.352 4.37352C11.7717 3.76506 13.316 4.92718 13.1244 6.45988L13.0568 7C14.1537 6.56127 15.3084 7.4907 15.1142 8.65595L15.0449 9.07153C14.7633 10.7614 13.3012 12 11.588 12H4.05892C2.0541 12 0.358966 10.5159 0.0940032 8.52866L0.0241185 8.00452C-0.210422 6.24546 1.30006 4.74903 3.05685 5L2.95266 3.95816ZM4.55685 7H2.55685V8H4.55685V7ZM4.55685 9H2.55685V10H4.55685V9ZM5.55685 7H7.55685V8H5.55685V7ZM7.55685 9H5.55685V10H7.55685V9ZM5.55685 13H7.55685L8.05685 16L9.55685 13H10.5569L9.49201 16.5495C9.21835 17.4617 9.39407 18.4496 9.96549 19.2115L10.5569 20H7.55685V18H6.55685V20H4.55685L5.35542 18.9352C5.80652 18.3338 6.01534 17.5848 5.94053 16.8367L5.55685 13Z" />
+                    </clipPath>
+
+                    <clipPath id="rectangleClip">
+                        <rect id="rectangle1" width="16" height="16" />
+                    </clipPath>
+
+                    <clipPath id="rectangleTreehouseClip" clip-path="url(#treehouse)">
+                        <rect id="rectangle2" width="16" height="16" />
+                    </clipPath>
+
+                    <g transform="translate(3 0)">
+                        <rect width="32" height="32" fill="white" clip-path="url(#treehouse)" />
+                        <rect width="32" height="32" fill="white" clip-path="url(#rectangleClip)" />
+                        <rect width="32" height="32" fill="black" clip-path="url(#rectangleTreehouseClip)" />
+                    </g>
+                </mask>
+
+                <rect width="32" height="32" fill="currentColor" mask="url(#mask)" />
+            </g>
+
+            <style>
+                #rectangle1,
+                #rectangle2 {
+                    transform: translate(16px, 12px) rotate(15deg) translate(-8px, -8px);
+                    rx: 0px;
+                    transition: all 1s;
+                }
+
+                #all:hover #rectangle1,
+                #all:hover #rectangle2 {
+                    transform: translate(22px, 24px) rotate(360deg) translate(-2px, -2px);
+                    width: 4px;
+                    height: 4px;
+                    rx: 4px;
+                }
+            </style>
+        </svg>
+    </a>
+</footer>

template/components/_head.hbs

@@ -0,0 +1,37 @@
+<meta charset="UTF-8">
+
+<title>{{#if (ne page.title config.user.title)}}{{ page.title }} · {{/if}}{{ config.user.title }}</title>
+
+<meta name="viewport" content="width=device-width, initial-scale=1">
+
+<link rel="preload" href="{{ config.site }}/static/font/Recursive_VF_1.085.woff2" as="font" type="font/woff2"
+    crossorigin="anonymous">
+<link rel="stylesheet" href="{{ config.site }}/static/css/main.css">
+<link rel="stylesheet" href="{{ config.site }}/static/css/tree.css">
+
+<script>
+    const TREEHOUSE_SITE = `{{ config.site }}`;
+    const TREEHOUSE_NEWS_COUNT = {{ len feeds.news.branches }};
+</script>
+<script type="module" src="{{ config.site }}/navmap.js"></script>
+<script type="module" src="{{ config.site }}/static/js/ulid.js"></script>
+<script type="module" src="{{ config.site }}/static/js/usability.js"></script>
+<script type="module" src="{{ config.site }}/static/js/settings.js"></script>
+<script type="module" src="{{ config.site }}/static/js/tree.js"></script>
+<script type="module" src="{{ config.site }}/static/js/emoji.js"></script>
+<script type="module" src="{{ config.site }}/static/js/thanks-webkit.js"></script>
+<script type="module" src="{{ config.site }}/static/js/news.js"></script>
+
+<meta property="og:site_name" content="{{ config.user.title }}">
+<meta property="og:title" content="{{ page.title }}">
+{{!--
+This is a bit of a hack to quickly insert metadata into generated pages without going through Handlebars, which
+would involve registering, parsing, and generating a page from a template.
+Yes it would be more flexible that way, but it doesn't need to be.
+It just needs to be a string replacement.
+--}}
+<!-- treehouse-ca37057a-cff5-45b3-8415-3b02dbf6c799-per-branch-metadata -->
+{{#if page.thumbnail}}
+<meta property="og:image" content="{{ page.thumbnail.url }}">
+<meta property="og:image:alt" content="{{ page.thumbnail.alt }}">
+{{/if}}

template/components/_nav.hbs

@@ -0,0 +1,23 @@
+<nav>
+    <a href="{{ config.site }}/" title="Back to homepage">
+        <svg class="logo" width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+            <path fill-rule="evenodd" clip-rule="evenodd"
+                d="M8 3H7H6V4V5H4V6H6V9V10H7H10V12H11V10H12H13V9V8V7H12H11H10V8V9H7V6H8H9V5V4V3H8ZM12 9H11V8H12V9ZM7 5V4H8V5H7ZM3 5H2V6H3V5ZM10 13H11V14H10V13Z"
+                fill="currentColor" />
+        </svg>
+    </a>
+
+    <div class="nav-page">
+        {{#if page.breadcrumbs}}
+        <ol class="breadcrumbs">
+            {{{ page.breadcrumbs }}}
+        </ol>
+        {{/if}}
+
+        {{#if (and (ne page.title config.user.title) (ne page.title page.tree_path))}}
+        <h1 class="page-title">{{ page.title }}</h1>
+        {{/if}}
+    </div>
+
+    {{> @partial-block }}
+</nav>

template/components/_noscript.hbs

@@ -0,0 +1,20 @@
+<noscript>
+    <div class="noscript" role="note">
+        <p>hey! looks like you have <strong>JavaScript disabled.</strong><br>
+            I respect that decision, but you may find the experience of browsing the treehouse… not great.<br>
+            for example, links to branches may not work properly. I cannot do anything about this; it's due to how
+            the <code>&lt;details&gt;</code> element works.<br>
+            (a <code>&lt;details&gt;</code> will not expand itself automatically to reveal the linked element to
+            you.)<br>
+            I did my best to at least keep the site readable in this state, but you can only do so much with plain
+            HTML and CSS.</p>
+
+        <p><strong>Pinky promise this website does not contain any malicious code such as trackers or cryptocurrency
+                miners.</strong><br>
+            if you don't believe me, you're free to inspect the source yourself! all the scripts are written
+            lovingly in vanilla JS (not minified!) by yours truly ❤️</p>
+        <small>and if this box is annoying, feel free to block it with uBlock Origin or something. I have no
+            way of remembering you closed it, and don't wanna add a database to this website. simplicity
+            rules!</small>
+    </div>
+</noscript>

template/components/_tree.hbs

@@ -0,0 +1,17 @@
+<main class="tree">
+    {{!-- Append page styles and scripts into the main content, such that they can be inlined
+    into linked branches when those are loaded in. Putting them in the page's head would make
+    extracting them way more painful than it needs to be. --}}
+
+    {{#each page.styles}}
+    <link rel="stylesheet" href="{{ ../config.site }}/static/css/{{ this }}">
+    {{/each}}
+
+    {{#each page.scripts}}
+    <script type="module" src="{{ ../config.site }}/static/js/{{ this }}"></script>
+    {{/each}}
+
+    {{{ page.tree }}}
+</main>
+
+<th-emoji-tooltips></th-emoji-tooltips>

template/components/_webkit.hbs

@@ -0,0 +1,7 @@
+<div id="webkit-makes-me-go-insane" class="noscript" role="note">
+    <p>hey! looks like you're using a weird or otherwise quirky web browser. this basically means, the website will
+        not work for you correctly. I might fix it in the future but I have very limited time to work on this
+        website and so don't have an estimate on when that might happen.</p>
+    <p>in the meantime I suggest switching to <a href="https://firefox.com">something more modern.</a></p>
+    <p>sorry for the inconvenience!</p>
+</div>