Extract translation texts from aurelia-i18n

translate.js

"use strict";

const fs = require('fs');
const path = require('path');
const readdirp = require('readdirp');

const Parser = require('i18next-scanner').Parser;
const WebpackPreBuildPlugin = require('pre-build-webpack');
const {i18nextToPo, i18nextToPot} = require('i18next-conv');

const parseConfig = {
    attr: {
        list: ['t']
    },
    func: {
        list: ['i18next.t', 'i18n.t']
    },
    nsSeparator: false,
    keySeparator: false,
    defaultNs: 'translation',
    interpolation: {
        prefix: '${',
        suffix: '}'
    },
};

const convertConfig = {
    language: 'en',
    project: 'aurelia-skeleton-navigation-webpack',
};

// charsMap is not needed if you do not use pseudo translation
const charsMap = {
    'a': 'ààà', 'b': 'ƀ', 'c': 'ç', 'd': 'ð', 'e': 'ééé', 'f': 'ƒ', 'g': 'ĝ', 'h': 'ĥ', 'i': 'îîî', 'l': 'ļ', 'k': 'ķ', 'j': 'ĵ', 'm': 'ɱ',
    'n': 'ñ', 'o': 'ôôô', 'p': 'þ', 'q': 'ǫ', 'r': 'ŕ', 's': 'š', 't': 'ţ', 'u': 'ûûû', 'v': 'ṽ', 'w': 'ŵ', 'x': 'ẋ', 'y': 'ý', 'z': 'ž',
    'A': 'ÀÀÀ', 'B': 'Ɓ', 'C': 'Ç', 'D': 'Ð', 'E': 'ÉÉÉ', 'F': 'Ƒ', 'G': 'Ĝ', 'H': 'Ĥ', 'I': 'ÎÎÎ', 'L': 'Ļ', 'K': 'Ķ', 'J': 'Ĵ', 'M': 'Ṁ',
    'N': 'Ñ', 'O': 'ÔÔÔ', 'P': 'Þ', 'Q': 'Ǫ', 'R': 'Ŕ', 'S': 'Š', 'T': 'Ţ', 'U': 'ÛÛÛ', 'V': 'Ṽ', 'W': 'Ŵ', 'X': 'Ẋ', 'Y': 'Ý', 'Z': 'Ž'
};

module.exports = new WebpackPreBuildPlugin(function() {
    let parser = new Parser(parseConfig);

    readdirp({
        root: 'src',
        entryType: 'files'
    }, function(file) {
        let fullPath = file.fullPath;
        let extension = path.extname(fullPath).toLowerCase();

        switch (extension) {
            case '.html':
            case '.htm':
                let template = fs.readFileSync(fullPath, 'utf-8');
                parser.parseAttrFromString(template);
                break;

            case '.js':
                let script = fs.readFileSync(fullPath, 'utf-8');
                parser.parseFuncFromString(script);
                break;
        }
    }, function() {
        let translations = parser.get().en.translation;
        delete translations[''];

        // Ensure translations folder exists
        if (!fs.existsSync('translations'))
            fs.mkdirSync('translations');

        // POT file
        i18nextToPot('en', JSON.stringify(translations), convertConfig)
            .then(function(result) {
                fs.writeFileSync('translations/translation.pot', result)
            });
        
        // End of extraction, remove the rest if you do not need pseudo translation

        // Pseudo translation
        Object.keys(translations).forEach(function(key) {
            let pseudo = '';
            for (let i = 0; i < key.length; i++) {
                let alternatives = charsMap[key[i]];
                if (!alternatives) {
                    pseudo += key[i];
                    continue;
                }

                pseudo += alternatives[i % alternatives.length];
            }

            translations[key] = pseudo;
        });

        // Pseudo json file
        fs.writeFileSync('translations/translation.qps-PLOC.json',
            JSON.stringify({'qps-ploc': translations}, null, 2));
    });
});

webpack.config.js

const translate = require('./translate');

const baseConfig = {
    // Webpack config here
    plugins: [
        translate,
        // Other webpack plugins, if needed here
    ]
}