Reddit Hide Loaded Posts

Adds one button to hide all currently loaded Reddit feed posts.
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// ==UserScript==
// @name         Reddit Hide Loaded Posts
// @namespace    floris.webpatches
// @version      1.0.0
// @description  Adds one button to hide all currently loaded Reddit feed posts.
// @author       Floris
// @match        https://www.reddit.com/*
// @run-at       document-idle
// @grant        none
// @license      MIT
// ==/UserScript==

(() => {
  "use strict";

  const BUTTON_ID = "floris-hide-loaded-posts";
  const DELAY_MS = 1500;

  let busy = false;
  let updateTimer = null;

  const sleep = ms =>
    new Promise(resolve => setTimeout(resolve, ms));

  function getPosts() {
    if (location.pathname.includes("/comments/")) {
      return [];
    }

    return [...document.querySelectorAll("shreddit-post")]
      .filter(post => {
        if (post.offsetParent === null) return false;
        if (post.closest("shreddit-ad-post")) return false;
        if (post.matches('[data-shreddit-promoted="true"]')) return false;

        const menu = post.querySelector(
          "shreddit-post-overflow-menu"
        );

        if (!menu) return false;

        const actions = menu.overflowActions;

        if (Array.isArray(actions)) {
          return actions.some(
            action => action?.id === "hide"
          );
        }

        return true;
      });
  }

  async function hideThroughComponent(post) {
    const menu = post.querySelector(
      "shreddit-post-overflow-menu"
    );

    if (!menu) return false;

    const actions = menu.overflowActions;

    if (!Array.isArray(actions)) return false;

    const hideAction = actions.find(
      action => action?.id === "hide"
    );

    if (
      !hideAction ||
      typeof hideAction.onClick !== "function"
    ) {
      return false;
    }

    try {
      await hideAction.onClick();
      return true;
    } catch {
      return false;
    }
  }

  async function hideThroughMenu(post) {
    const menu = post.querySelector(
      "shreddit-post-overflow-menu"
    );

    if (!menu) return false;

    const trigger =
      menu.querySelector("button") ||
      menu.shadowRoot?.querySelector("button");

    if (!trigger) return false;

    trigger.click();
    await sleep(300);

    const candidates = [
      ...document.querySelectorAll(
        'button, a, [role="menuitem"], li'
      )
    ];

    const hideItem = candidates.find(element => {
      const text =
        element.textContent?.trim().toLowerCase();

      return (
        text === "hide" ||
        text === "verbergen" ||
        text === "post verbergen"
      );
    });

    if (!hideItem) {
      document.body.click();
      return false;
    }

    hideItem.click();
    return true;
  }

  async function hidePost(post) {
    let ok = await hideThroughComponent(post);

    if (!ok) {
      ok = await hideThroughMenu(post);
    }

    return ok;
  }

  function getButton() {
    return document.getElementById(BUTTON_ID);
  }

  function setButtonText(text) {
    const button = getButton();

    if (button) {
      button.textContent = text;
    }
  }

  function updateButton() {
    if (busy) return;

    const button = getButton();

    if (!button) return;

    const count = getPosts().length;

    button.disabled = count === 0;

    button.textContent =
      count === 0
        ? "No loaded posts"
        : `Hide ${count} loaded post${count === 1 ? "" : "s"}`;
  }

  function scheduleUpdate() {
    clearTimeout(updateTimer);

    updateTimer = setTimeout(
      updateButton,
      350
    );
  }

  async function hideLoadedPosts() {
    if (busy) return;

    const posts = getPosts();

    if (!posts.length) {
      updateButton();
      return;
    }

    busy = true;

    const button = getButton();
    button.disabled = true;

    let hidden = 0;
    let failed = 0;

    for (let i = 0; i < posts.length; i++) {
      setButtonText(
        `Hiding ${i + 1}/${posts.length} · ${hidden} hidden`
      );

      const ok = await hidePost(posts[i]);

      if (ok) {
        hidden++;
      } else {
        failed++;
      }

      if (i < posts.length - 1) {
        await sleep(DELAY_MS);
      }
    }

    setButtonText(
      failed
        ? `Done · ${hidden} hidden · ${failed} failed`
        : `Done · ${hidden} hidden`
    );

    busy = false;
    button.disabled = false;

    setTimeout(
      updateButton,
      1800
    );
  }

  function createButton() {
    if (getButton()) return;

    const button =
      document.createElement("button");

    button.id = BUTTON_ID;
    button.type = "button";
    button.textContent = "Hide loaded posts";

    Object.assign(button.style, {
      position: "fixed",
      right: "24px",
      bottom: "82px",
      zIndex: "2147483647",

      display: "flex",
      alignItems: "center",
      justifyContent: "center",

      minWidth: "148px",
      height: "38px",
      padding: "0 16px",
      boxSizing: "border-box",

      border: "1px solid rgba(255,255,255,.18)",
      borderRadius: "999px",

      background: "rgba(20,20,22,.96)",
      color: "#ffffff",

      fontFamily: "system-ui, -apple-system, BlinkMacSystemFont, sans-serif",
      fontSize: "13px",
      fontWeight: "600",
      lineHeight: "1",

      whiteSpace: "nowrap",
      textAlign: "center",

      boxShadow: "0 6px 24px rgba(0,0,0,.28)",
      cursor: "pointer"
    });

    button.addEventListener(
      "click",
      hideLoadedPosts
    );

    document.body.appendChild(button);

    updateButton();
  }

  createButton();

  addEventListener(
    "scroll",
    scheduleUpdate,
    { passive: true }
  );

  addEventListener(
    "popstate",
    scheduleUpdate
  );

  document.addEventListener(
    "visibilitychange",
    () => {
      if (!document.hidden) {
        scheduleUpdate();
      }
    }
  );

  setInterval(() => {
    if (!busy) {
      updateButton();
    }
  }, 5000);
})();