istanbul-reporter-shield-badge/update-readme-with-shield-badge.js

**Built for developers out there who do not want to (or cannot) rely on (and/or use) third-party services like http://codecov.io/ or http://coveralls.io/.**

/* **************
The only purpose of this script is to be used by the npm test script to write the shield badge within the README.md file
************** */ 

var fs = require('fs')
var path = require('path')
var istanbul = require('istanbul')
var collector = new istanbul.Collector()
var Report = istanbul.Report
var shieldBadgeReporter = require('./istanbul-reporter-shield-badge')

istanbul.Report.register(shieldBadgeReporter)
var report = Report.create('shield-badge', {
  readmeFilename: 'README.md',
  readmeDir: path.resolve(__dirname, '.'),
  subject: 'Local Coverage'
})

try {
  console.log('\n====================== Adding the badge to the ' + report.readmeFilename + ' =======================')
  var coverageDir = path.resolve(__dirname, 'coverage')
  fs.readdirSync(coverageDir).forEach(function (file) {
    if (file.indexOf('cov') === 0 && file.indexOf('.json') > 0) {
        collector.add(JSON.parse(fs.readFileSync(path.resolve(coverageDir, file), 'utf8')))
    }
  })
  report.on('done', function () { 
    console.log('The istanbul shield badge report has been generated')
  })
  report.writeReport(collector, true)
} catch (err) {
  console.error(err.message)
  process.exit(1)
}