rung-tools / rung-cli

import path from 'path';

import fs from 'fs';

import { promisify, resolve } from 'bluebird';

import osLocale from 'os-locale';

import { curry, propOr, replace } from 'ramda';

const readFile = promisify(fs.readFile);

/**

 * Returns the user locale. Firstly consider the env variable and, if it

 * doesn't exist, consider machine's locale

 *

 * @return {Promise}

 */

export function getLocale() {

    const { RUNG_LOCALE } = process.env;

    return resolve(RUNG_LOCALE ? RUNG_LOCALE : osLocale());

}

/**

 * Translates a string or fallback to the key

 *

 * @param {Object} map - Object containing app strings

 * @param {String} key - Key to search in hashmap

 * @return {String}

 */

export const translator = curry((map, key, params = {}) => {

    const sentence = propOr(key, key, map);

    return replace(

        /{{(\w+)}}/g,

        (full, partial) => params[partial] || full,

        sentence

    );

});

/**

 * Reads the JSON file corresponding to a specific locale

 *

 * @return {Promise}

 */

export function getLocaleStrings() {

    return getLocale()

        .then(locale => readFile(path.join('locales', `${locale}.json`)))

        .then(JSON.parse)

        .catchReturn({});

}