fetch short url of "goo.gl"

fetch-goo.gl.js

#!/usr/bin/env node
'use strict';
const fetch = require('node-fetch');
const exec = require('child_process').execSync;
const ptt_url = 'https://www.ptt.cc/bbs/NBA/M.1461627008.A.3D4.html';

fetch(ptt_url)
.then(res => {
  if (res.status !== 200) {
    throw new Error(`request to ${ptt_url} failed, status code = ${res.status} (${res.statusText})`);
  }
  return res.text();
})
.then(html => {
  let map = {};
  html.match(/http[s]?:\/\/goo\.gl\/\w+/ig)
    .forEach(url => {
      // filter reproduced url
      map[url] = true;
    });

  return Object.keys(map);
})
.then(list => {
  list.forEach(url => {
    // exec('open ' + url);
    console.log(url);
  });
})
.catch(console.error);