Mustache-based translations

build.js

const fs = require('fs');
var exec = require('child_process').exec;

const DATA = 'data/';
const TEMPLATES = 'templates/';
const OUTPUT = 'build/';

// Retrieve language from args
const args = process.argv.slice(2);
const lang = args[0];
if (!lang || lang == "") {
  console.error('No language specified');
  process.exit(1);
}

// Check for corresponding data file
const dataFile = DATA + lang + '.json';

if (!fs.existsSync(dataFile)) {
  console.error('Data file for "' + lang + '" not found in data directory');
  process.exit(1);
}

// Run mustache for perform replacements
// Once per file in the templates directory
fs.readdir(TEMPLATES, (err, files) => {
  if (err) {
    console.error("Unable to access data directory", err);
    process.exit(1);
  }

  files.forEach((file, index) => {
    const templateFile = TEMPLATES + file;
    const outputFile = OUTPUT + file;
    exec(`mustache ${dataFile} ${templateFile} > ${outputFile}`, (err) => {
      if (err) {
        console.error('Unable to run mustache on template', err);
        process.exit(1);
      }

      console.log(`Processed ${templateFile} to ${outputFile}`);
    });
  });
});