Add the Unignore All miscellaneous feature.

source/content-scripts/features/exports.ts

@@ -9,5 +9,6 @@ export * from "./jump-to-new-comment.js";
 export * from "./markdown-toolbar.js";
 export * from "./themed-logo.js";
 export * from "./topic-info-ignore.js";
+export * from "./unignore-all-button.js";
 export * from "./user-labels.js";
 export * from "./username-colors.js";

source/content-scripts/features/unignore-all-button.tsx

@@ -0,0 +1,114 @@
+import {Component, render} from "preact";
+import {log, querySelectorAll, sleep} from "../../utilities/exports.js";
+
+export function runUnignoreAllButtonFeature(): void {
+  if (addUnignoreAllButton()) {
+    log("Added Unignore All button.");
+  }
+}
+
+function addUnignoreAllButton(): boolean {
+  // Only add the button when we're on the ignore list page and the ignore list
+  // isn't empty.
+  if (
+    window.location.pathname !== "/ignored_topics" &&
+    document.querySelector("main > .empty") === null
+  ) {
+    return false;
+  }
+
+  const heading = document.querySelector(".heading-main") ?? undefined;
+  if (heading === undefined) {
+    return false;
+  }
+
+  const button = document.createDocumentFragment();
+  render(<UnignoreAllButton />, button);
+  heading.after(button);
+
+  return true;
+}
+
+type Props = Record<string, unknown>;
+
+type State = {
+  isRunning: boolean;
+  remaining: number;
+  total: number;
+  wasCanceled: boolean;
+};
+
+class UnignoreAllButton extends Component<Props, State> {
+  constructor(props: Props) {
+    super(props);
+
+    this.state = {
+      isRunning: false,
+      remaining: 0,
+      total: 0,
+      wasCanceled: false,
+    };
+  }
+
+  click = () => {
+    if (this.state.isRunning) {
+      // If we're already running, cancel the run.
+      this.setState({isRunning: false, wasCanceled: true});
+      window.setTimeout(() => {
+        // And after 5 seconds, return back to the default state.
+        this.setState({wasCanceled: false});
+      }, 5000);
+      return;
+    }
+
+    // Select the ignore buttons that have a HTTP DELETE method set. Since we're
+    // going to have Intercooler do all the work for us, we don't want to
+    // accidentally also select ignore buttons that would ignore the topics
+    // again.
+    const unignoreButtons = querySelectorAll<HTMLButtonElement>(
+      'button[name="topic-actions-ignore"][data-ic-delete-from]',
+    );
+    this.setState({
+      isRunning: true,
+      remaining: unignoreButtons.length,
+      total: unignoreButtons.length,
+    });
+    void this.unignoreAll(unignoreButtons);
+  };
+
+  unignoreAll = async (buttons: HTMLButtonElement[]) => {
+    let remaining = buttons.length;
+    for (const ignoreButton of buttons) {
+      // Stop the loop if the user canceled it.
+      if (!this.state.isRunning && this.state.wasCanceled) {
+        return;
+      }
+
+      ignoreButton.click();
+      remaining--;
+      this.setState({remaining});
+      await sleep(250);
+    }
+
+    this.setState({isRunning: false});
+  };
+
+  render() {
+    const {isRunning, remaining, total, wasCanceled} = this.state;
+    let text = "Unignore All";
+
+    if (isRunning) {
+      // When we're running show how many topics are remaining.
+      text = `Unignoring topics, ${remaining} out of ${total} remaining`;
+    } else if (wasCanceled) {
+      // If the user canceled, say that.
+      text = "Canceled unignoring all topics";
+    }
+
+    return (
+      <button class="btn" onClick={this.click}>
+        {text}
+      </button>
+    );
+  }
+}

source/content-scripts/setup.tsx

@@ -24,6 +24,7 @@ import {
   runMarkdownToolbarFeature,
   runThemedLogoFeature,
   runTopicInfoIgnore,
+  runUnignoreAllButtonFeature,
   runUsernameColorsFeature,
 } from "./features/exports.js";
 
@@ -176,6 +177,13 @@ async function initialize() {
     runTopicInfoIgnore();
   }
 
+  if (
+    miscEnabled.value.has(MiscellaneousFeature.UnignoreAllButton) &&
+    isLoggedIn
+  ) {
+    runUnignoreAllButtonFeature();
+  }
+
   // Insert a placeholder at the end of the body first, then render the rest
   // and use that as the replacement element. Otherwise render() would put it
   // at the beginning of the body which causes a bunch of different issues.

source/options/components/miscellaneous.tsx

@@ -42,6 +42,14 @@ function FeatureDescription({
     );
   }
 
+  if (feature === MiscellaneousFeature.UnignoreAllButton) {
+    return (
+      <p class="description">
+        Add an "Unignore All" button to your list of ignored topics.
+      </p>
+    );
+  }
+
   return <></>;
 }
 

source/storage/enums.ts

@@ -23,6 +23,7 @@ export enum MiscellaneousFeature {
   CommentAnchorFix = "comment-anchor-fix",
   GroupListSubscribeButtons = "group-list-subscribe-buttons",
   TopicInfoIgnore = "topic-info-ignore",
+  UnignoreAllButton = "unignore-all-button",
 }
 
 /**