show `Share Tumblr` button on nicovideo.jp

nicovideo2tumblr_nicovideo.user.js

// ==UserScript==
// @name         NicoVideo to Tumblr (nicovideo)
// @namespace    https://u.chimata.org/
// @version      0.1
// @description  show `Share Tumblr` button on nicovideo.jp
// @author       You
// @match        https://*.nicovideo.jp/watch/*
// @grant        none
// ==/UserScript==

(function() {
  'use strict';

  var timerId; timerId = setInterval(function() {
    var button = document.querySelector('button.SharePanelVisibleButton');
    if (button) {
      clearInterval(timerId);
      button.addEventListener('click', showTumblrButton, false);
    }
  }, 100);

  function showTumblrButton() {
    setTimeout(function() {
      var t = document.querySelector('textarea.SharePanelContainer-textarea');
      if (t) {
        var div = document.querySelector('.SharePanelContainer-radioGroup');
        var url = 'https://www.tumblr.com/widgets/share/tool?canonicalUrl=https://www.nicovideo.jp/'
          + '&posttype=video&caption=' + t.value.match(/<a[^>]+>(.*)<\/a>/)[1];
        var tumblrButton = document.createElement('button');
        tumblrButton.className = 'tumblr-button';
        tumblrButton.innerText = 'Share Tumblr';
        tumblrButton.style.display = 'block';
        tumblrButton.style.margin = '10px auto';
        tumblrButton.style.padding = '8px';
        tumblrButton.style.fontSize = '0.8rem';
        tumblrButton.style.color = '#fff';
        tumblrButton.style.backgroundColor = '#001935';
        tumblrButton.style.border = '1px solid #ccc';
        tumblrButton.style.borderRadius = '4px';
        tumblrButton.addEventListener('click', function() {
            t.focus();
            document.execCommand('copy');
            t.blur();
            window.open(url);
        }, false);
        div.appendChild(tumblrButton);
      }
    }, 100);
  }
})();

nicovideo2tumblr_tumblr.user.js

// ==UserScript==
// @name         NicoVideo to Tumblr (tumblr)
// @namespace    https://u.chimata.org/
// @version      0.1
// @description  show `Share Tumblr` button on nicovideo.jp
// @author       You
// @match        https://www.tumblr.com/widgets/share/tool?canonicalUrl=https://www.nicovideo.jp/*
// @grant        none
// ==/UserScript==

(function() {
  'use strict';

  var timerId; timerId = setInterval(function() {
    var button = document.querySelector('.media-url-button');
    if (button) {
      clearInterval(timerId);
      button.addEventListener('click', function() {
        setTimeout(function() {
          document.querySelector('.media-url .editor-plaintext span').focus()
          console.log('auto paste embed code:', document.execCommand('paste'));
        }, 500);
      });
      button.click();
    }
  }, 100);
})();