scratch-www/src/scripts/build-locales

#!/usr/bin/env node

/*
    Converts the existing .po translation files in the module to JSON files.
    Requires po2json in order to work. Takes as input a directory
    in which to store the resulting json translation files.
*/

var fs = require('fs');
var glob = require('glob');
var path = require('path');
var po2icu = require('po2icu');

/*
    Existing translations should be in the key value format specified by react-intl (i.e.
    formatted message id, with icu string as the value). New Translations should be in the
    format returned by po2icu (i.e. a source language icu string for key, and a localized
    language icu string for value).

    ICU Map is an object in the reverse react-intl formatting (icu string as key), which will
    help determine if the translation belongs in www currently.
*/
var mergeNewTranslations = function (existingTranslations, newTranslations, icuMap) {
    for (var id in newTranslations) {
        if (icuMap.hasOwnProperty(id) && newTranslations[id].length > 0) {
            existingTranslations[icuMap[id]] = newTranslations[id];
        }
    }
    return existingTranslations;
};

var args = process.argv.slice(2);

if (!args.length) {
    process.stdout.write('A destination directory must be specified.');
    process.exit(1);
}

var poUiDir = path.resolve(__dirname, '../../node_modules/scratchr2_translations/ui');
var outputFile = path.resolve(__dirname, '../../', args[0]);
// Create the directory if it doesn't exist.
var fileInfo = path.parse(outputFile);
try {
    fs.accessSync(fileInfo.dir, fs.F_OK);
} catch (err) {
    // Doesn't exist – create it.
    fs.mkdirSync(fileInfo.dir);
}

var icuTemplateFile = path.resolve(__dirname, '../../en.json');
var idsWithICU = JSON.parse(fs.readFileSync(icuTemplateFile, 'utf8'));
var icuWithIds = {};
for (var id in idsWithICU) {
    icuWithIds[idsWithICU[id]] = id;
}
var locales = {
    en: idsWithICU
};

// Get ui localization strings first
glob(poUiDir + '/*', function (err, files) {
    if (err) throw new Error(err);
    
    files.forEach(function (file) {
        var lang = file.split('/').pop();
        var jsFile = path.resolve(file, 'LC_MESSAGES/djangojs.po');
        var pyFile = path.resolve(file, 'LC_MESSAGES/django.po');

        var translations = {};
        try {
            var jsTranslations = po2icu.poFileToICUSync(lang, jsFile);
            translations = mergeNewTranslations(translations, jsTranslations, icuWithIds);
        } catch (err) {
            process.stdout.write(lang + ': ' + err + '\n');
        }

        try {
            var pyTranslations = po2icu.poFileToICUSync(lang, pyFile);
            translations = mergeNewTranslations(translations, pyTranslations, icuWithIds);
        } catch (err) {
            process.stdout.write(lang + ': ' + err + '\n');
        }

        locales[lang] = translations;
    });
    fs.writeFileSync(outputFile, JSON.stringify(locales, null, 4));
});