newsfeed

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);