tweet_atcoder_rating_simple.user.js

// ==UserScript==
// @name         tweet atcoder rating (simple)
// @namespace    tweet atcoder rating (simple)
// @version      0.2
// @author       koyumeishi
// @match        https://atcoder.jp/user/*
// @grant        none
// ==/UserScript==

(function() {
  'use strict';
  let prevRating = rating_history.length >= 2 ? rating_history[1][1] : "unrated";
  let currentRating = rating_history[0][1];
  let ratingDelta = currentRating - (prevRating !== "unrated" ? prevRating : 0);
  let contestName = rating_history[0][3];
  let contestRank = rating_history[0][2];
  
  let rankSuffix = 11 <= contestRank && contestRank <= 19 ? "th" : ["th", "st", "nd", "rd","th","th","th","th","th","th","th"][contestRank%10];
  let text =
`${contestName} : Rank ${contestRank}${rankSuffix}, Rating ${prevRating} -> ${currentRating} (${
  ratingDelta >= 0 ? "+" : ""
}${ratingDelta})`;
  console.log(text);

  $('div.col-sm-8 > dl.dl-horizontal').append(`<dd><a href="https://twitter.com/share" class="twitter-share-button" data-hashtags="AtCoder">Tweet</a>
<script>
!function(d,s,id){
let tweet_text = \`${text}\`;
document.getElementsByClassName("twitter-share-button")[0].setAttribute("data-text", tweet_text);
var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';
if(!d.getElementById(id)){
js=d.createElement(s);
js.id=id;
js.src=p+'://platform.twitter.com/widgets.js';
fjs.parentNode.insertBefore(js,fjs);
}
}(document, 'script', 'twitter-wjs');
</script>
</dd>`);
})();