cf.) http://qiita.com/59naga/items/1f1910a74a0eedcce4fb

npm-today.js

#!/usr/bin/env node

'use strict';

const npmCount = require('npm-count');

const today = new Date().toISOString().replace(/T.+$/g, '');
const RANK = 50;

const padLeft = (str, width, z) => {
  z = z || 0;
  str = str + '';
  if (str.length >= width) {
    return str;
  }
  return new Array(width - str.length + 1).join(z) + str;
}

const padRight = (str, width, z) => {
  z = z || 0;
  str = str + '';
  if (str.length >= width) {
    return str;
  }
  return str + new Array(width - str.length + 1).join(z);
}

npmCount.fetchTrending(today).then((trending) => {
  // sort by downloads desc, name asc
  const rank = trending
    .sort((a, b) => {
      if (a.downloads > b.downloads) {
        return -1;
      }
      if (a.downloads < b.downloads) {
        return 1;
      }
      if (a.name.toLowerCase() > b.name.toLowerCase()) {
        return -1;
      }
      if (a.name.toLowerCase() < b.name.toLowerCase()) {
        return 1;
      }

      return 0;
    })
    .slice(0, RANK)
    .map((pkg) => ({
      name: pkg.name,
      downloads: pkg.downloads
    }));

  const data = [].concat(rank);

  const longestName = data.sort((a, b) => {
    if (a.name.length > b.name.length) { return -1; }
    if (a.name.length < b.name.length) { return 1; }
  })[0].name;

  const maxDownloads = data.sort((a, b) => {
    if ((a.downloads + '').length > (b.downloads + '').length) { return -1; }
    if ((a.downloads + '').length < (b.downloads + '').length) { return 1; }
  })[0].downloads;

  rank.forEach((item, i) => {
    const order = padLeft(i + 1, (RANK + '').length);
    const name = padRight(item.name, longestName.length, '.');
    const downloads = padLeft(item.downloads, (maxDownloads + '').length, ' ');

    console.log(order, name, downloads);
  });

});