poor-coveralls.js

/**
 * Generates a msg with the Coverage Difference.
 * We used this output to generate a GH comment with the info.
 *
 * usage:
 *  node coveralls.js 31.3%
 *  node coveralls.js 34.3%
 */
var fs = require('fs');
var args = process.argv.slice(2);
var CURRENT_COVERAGE = '/var/lib/jenkins/.current-coverage.txt';
var IMAGE = "![Coverage Status](https://img.shields.io/badge/Coverage-%d%%-yellow.svg)";
var msg = '';
var diff = '';

try {
  fs.lstatSync(CURRENT_COVERAGE);
}
catch (e) {
  console.log("ERROR: " + CURRENT_COVERAGE + " doesn't exist.");
  process.exit()
}

var current = fs.readFileSync(CURRENT_COVERAGE, 'utf8').replace("%", "").trim();
var pr_covs = args[0].replace("%", "").trim();

if (current == pr_covs) {
  msg = "Coverage remained the same at %d%%." + IMAGE;
  diff = pr_covs;
}
if (current > pr_covs) {
  msg = "Coverage decreased (-%d%%)." + IMAGE;
  diff = (current - pr_covs).toFixed(2);
}
if (current < pr_covs) {
  msg = "Coverage increased (+%d%%)." + IMAGE;
  diff = (pr_covs - current).toFixed(2);
}

console.log(msg, diff, pr_covs);