imdb-movie-info-list.user.js

// ==UserScript==
// @name        IMDb movie info list
// @namespace   https://greasyfork.org/en/users/85671-jcunews
// @version     1.0.1
// @license     AGPL v3
// @author      jcunews
// @description Context: https://www.reddit.com/r/GreaseMonkey/comments/1113n2w/logging_to_a_document_and_appending_data_from_imdb/
// @match       https://www.imdb.com/title/tt*
// @grant       none
// ==/UserScript==

((inf, lst) => {
  if (inf = document.title.match(/^\s*(.* - )IMDb$/)) {
    inf = inf[1] + location.pathname.match(/\/tt(\d+)/)[1]
  } else inf = "";
  lst = localStorage.movieInfoList ? localStorage.movieInfoList.split("\n") : [];
  document.querySelector('[data-testid="hero-title-block__metadata"]').insertAdjacentHTML("beforeend", `
<style>
  #bmiaddel, #bmishow { margin-left: 2em; border-radius: .3em }
  #bmiaddel { width: 10em; background: #7d7 }
  #bmiaddel:before { content: "Add movie info" }
  #bmiaddel.del { background: #b00; color: #fff }
  #bmiaddel.del:before { content: "Remove movie info" }
  #bmiaddel:disabled { background: revert; color: #bbb }
</style>
<button id="bmiaddel"></button>
<button id="bmishow">Movie info list</button>`);
  if (inf) {
    if (lst.includes(inf)) bmiaddel.className = "del";
  } else bmiaddel.disabled = true;
  bmiaddel.onclick = () => {
    if (bmiaddel.className) { //delete
      bmiaddel.className = "";
      lst.splice(lst.indexOf(inf), 1);
    } else { //add
      bmiaddel.className = "del";
      lst.push(inf);
    }
    localStorage.movieInfoList = lst.join("\n");
  };
  bmishow.onclick = a => {
    if (localStorage.movieInfoList) {
      if (confirm(`Save below movie info list?\n\n${localStorage.movieInfoList}`)) {
        (a = document.createElement("A")).href = URL.createObjectURL(new Blob([localStorage.movieInfoList], {type: "text/plain"}));
        a.download = "movie-info-list.txt";
        a.click();
        setTimeout(() => URL.revokeObjectURL(a.href), 10000);
      }
    } else alert("Movie info list is empty.");
  };
})()