element-web/scripts/copy-res.ts

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#!/usr/bin/env node
// copies the resources into the webapp directory.
import parseArgs from "minimist";
import * as chokidar from "chokidar";
import * as fs from "node:fs";
import _ from "lodash";
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import { util } from "webpack";
import { Translations } from "matrix-web-i18n";
const I18N_BASE_PATH = "src/i18n/strings/";
const INCLUDE_LANGS = [...new Set([...fs.readdirSync(I18N_BASE_PATH)])]
.filter((fn) => fn.endsWith(".json"))
.map((f) => f.slice(0, -5));
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const argv = parseArgs(process.argv.slice(2), {});
const watch = argv.w;
const verbose = argv.v;
function errCheck(err?: Error): void {
if (err) {
console.error(err.message);
process.exit(1);
}
}
// Check if webapp exists
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if (!fs.existsSync("webapp")) {
fs.mkdirSync("webapp");
}
// Check if i18n exists
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if (!fs.existsSync("webapp/i18n/")) {
fs.mkdirSync("webapp/i18n/");
}
const logWatch = (path: string) => {
if (verbose) {
console.log(`Watching: ${path}`);
}
};
function prepareLangFile(lang: string, dest: string): [filename: string, json: string] {
const path = I18N_BASE_PATH + lang + ".json";
let translations: Translations = {};
[path].forEach(function (f) {
if (fs.existsSync(f)) {
try {
translations = _.merge(translations, JSON.parse(fs.readFileSync(f).toString()));
} catch (e) {
console.error("Failed: " + f, e);
throw e;
}
}
});
const json = JSON.stringify(translations, null, 4);
const jsonBuffer = Buffer.from(json);
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const digest = util.createHash("xxhash64").update(jsonBuffer).digest("hex").slice(0, 7);
const filename = `${lang}.${digest}.json`;
return [filename, json];
}
function genLangFile(dest: string, filename: string, json: string) {
fs.writeFileSync(dest + filename, json);
if (verbose) {
console.log("Generated language file: " + filename);
}
}
function genLangList(langFileMap: Record<string, string>): void {
const languages: Record<string, string> = {};
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INCLUDE_LANGS.forEach(function (lang) {
const normalizedLanguage = lang.toLowerCase().replace("_", "-");
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const languageParts = normalizedLanguage.split("-");
if (languageParts.length == 2 && languageParts[0] == languageParts[1]) {
languages[languageParts[0]] = langFileMap[lang];
} else {
languages[normalizedLanguage] = langFileMap[lang];
}
});
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fs.writeFile("webapp/i18n/languages.json", JSON.stringify(languages, null, 4), function (err) {
if (err) {
console.error("Copy Error occured: " + err.message);
throw new Error("Failed to generate languages.json");
}
});
if (verbose) {
console.log("Generated languages.json");
}
}
/*
* watch the input files for a given language,
* regenerate the file, adding its content-hashed filename to langFileMap
* and regenerating languages.json with the new filename
*/
function watchLanguage(lang: string, dest: string, langFileMap: Record<string, string>): void {
const path = I18N_BASE_PATH + lang + ".json";
// XXX: Use a debounce because for some reason if we read the language
// file immediately after the FS event is received, the file contents
// appears empty. Possibly https://github.com/nodejs/node/issues/6112
let makeLangDebouncer: ReturnType<typeof setTimeout>;
const makeLang = (): void => {
if (makeLangDebouncer) {
clearTimeout(makeLangDebouncer);
}
makeLangDebouncer = setTimeout(() => {
const [filename, json] = prepareLangFile(lang, dest);
genLangFile(dest, filename, json);
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langFileMap[lang] = filename;
genLangList(langFileMap);
}, 500);
};
[path].forEach(function (f) {
chokidar
.watch(f, { ignoreInitial: true })
.on("ready", () => {
logWatch(f);
})
.on("add", makeLang)
.on("change", makeLang)
.on("error", errCheck);
});
}
// language resources
const I18N_DEST = "webapp/i18n/";
const I18N_FILENAME_MAP = INCLUDE_LANGS.reduce<Record<string, string>>((m, l) => {
const [filename, json] = prepareLangFile(l, I18N_DEST);
if (!watch) {
genLangFile(I18N_DEST, filename, json);
}
m[l] = filename;
return m;
}, {});
if (watch) {
INCLUDE_LANGS.forEach((l) => watchLanguage(l, I18N_DEST, I18N_FILENAME_MAP));
} else {
genLangList(I18N_FILENAME_MAP);
}