rate-it/scripts/translate.js

const path = require('path');
const fs = require('fs');
const argv = require('minimist')(process.argv.slice(2));
var readlineSync = require('readline-sync');
const root = path.resolve(__dirname+"/../config/locales");

const ALLOWED_LANG = ['fr'];

let langs = argv.dest.split(',');
let src  = argv.src

const generated = require(root+"/"+src+".json")[src];

langs.forEach(function(lang) {
    if (ALLOWED_LANG.indexOf(lang) === -1) {
        return;
    }

    let localePath = root+"/"+lang+".json";
    let locale = {};
    locale[lang] = {};
    try {
        locale = require(localePath);
    } catch(exception ) {
        console.log("New translation into : "+lang);
    }

    Object.keys(generated).forEach(function(word) {

        //If word hasn't already been translated
        if (!(word in locale[lang])) {
            console.log("New word to translate into "+lang);
            let translation = readlineSync.question('+ '+generated[word]+" : ", {
                encoding : 'utf-8'
            });
            locale[lang][word] = translation;
        }
    });

    let localeWords = Object.keys(locale[lang]);
    let generatedWords = Object.keys(generated);

    //Tidy locale file to remove useless translated words
    let data = {}
    localeWords.forEach(function(word) {
        if (generatedWords.indexOf(word) !== -1) {
            data[word] = locale[lang][word]
        }
    });
    locale[lang] = data;

    fs.writeFile(localePath, JSON.stringify(locale), function(err) {
        console.log("en -> "+lang);
    });

});