#!/usr/bin/env node

// Takes the '## Unreleased change' header CHANGELOG.md and replaces it with the current version

const fs = require('fs');
const path = require('path');
const packageJson = require('./package.json');

const changelog = path.join(__dirname, 'CHANGELOG.md');

fs.readFile(changelog, 'utf8', (err, data) => {
  if (err) {
    throw new Error(`Unable to read CHANGELOG.md: ${err.message}`);
  }

  const result = data.replace(/^# Changelog[\n]*## Unreleased changes/g, '$&\n\n## ' + packageJson.version);

  fs.writeFile(changelog, result, 'utf8', (err) => {
     if (err) {
       throw new Error(`Unable to write CHANGELOG.md: ${err.message}`);
     }
  });
});