Play text adventure games in your own language

infocom-localized.js

const vorpal = require('vorpal')();
const frotz = require('frotz-interfacer');
const translate = require('@k3rn31p4nic/google-translate-api');
const chalk = require('chalk');
const pMap = require('p-map');

// change the language by switching the country code
const sourceLanguage = 'fi';

// change the infocom game by adjusting this
const gameFile = './WISHBRIN.DAT';
//const gameFile = './node_modules/frotz-interfacer/frotz/data/zork1/DATA/ZORK1.DAT';

const fromEnglish = {from: 'en', to: sourceLanguage};
const toEnglish = {from: sourceLanguage, to: 'en'};

const interfacer = new frotz({
    executable: '/usr/local/bin/dfrotz',
    gameImage: gameFile,
    saveFile: './gamestate.sav',
    /*saveFile: './gamestate-'+Math.random().toString(36).substr(2, 9)+'.sav',*/
    outputFilter: frotz.filter
});

const printLocalized = (val) => vorpal.log(val);
const printInEnglish = (val) => vorpal.log(chalk.gray("["+val+"]"));
    
const translateAllFromEnglish = (itemArray) =>
    pMap(itemArray, async item => ({
        original: item,
        translated: (await translate(item, fromEnglish)).text
    }), {concurrency: 10});

const runGameEngineStep = (input) =>
    new Promise((resolve, reject) =>
        interfacer.iteration(input, async (error, output) =>
            (error && error.error) ? reject(error) : resolve(output.pretty)
    ));

const runGameStepLocalized = async (gameCommand = ' ') => {
    const gameOutput = await runGameEngineStep(gameCommand);
    const allTranslations = await translateAllFromEnglish(gameOutput);
    for(let i of allTranslations) {
        printLocalized(i.translated);
        printInEnglish(i.original);
    }
};

// handle errors for this separately?
const handleCommand = async (args, cb) => {
    const { text: command } = await translate(args.words.join(' '), toEnglish);
    printInEnglish(command);
    await runGameStepLocalized(command);     
    cb();
};

(async () => {
    try {
        vorpal.delimiter(">>").show().catch('[words...]', 'Catches commands').action(handleCommand);
        await runGameStepLocalized();
    } catch(error) {
        console.log('Error while executing,', error);
    }
})();

Code is quite hackish, sorry about that. Some synonyms cause problems when using this with Finnish at least, for example "lue esitettä" doesn't work, since "esite" gets translated to "brochure" while Zork understands only "leaflet". "Lue leaflet" works though.