From 89bb3380657fcd95ff55d8013fea9bf1bb7c5e21 Mon Sep 17 00:00:00 2001
From: Nikita Karamov <me@kytta.dev>
Date: Sun, 27 Aug 2023 23:43:01 +0200
Subject: [PATCH] Implement translations

See also: https://github.com/kytta/share2fedi/pull/43
Co-authored-by: Sunny Ripert <sunny@sunfox.org>
---
 src/components/form.astro            |  8 +++-
 src/components/instance-select.astro | 25 +++++++++----
 src/components/language-select.astro | 55 ++++++++++++++++++++++++++++
 src/i18n/engine.ts                   | 54 +++++++++++++++++++++++++++
 src/i18n/translations.ts             | 55 ++++++++++++++++++++++++++++
 src/layouts/layout.astro             |  4 +-
 src/pages/index.astro                | 52 ++++++++++++++++----------
 src/stores/i18n.ts                   |  3 ++
 src/styles/main.scss                 |  3 ++
 tsconfig.json                        |  1 +
 10 files changed, 231 insertions(+), 29 deletions(-)
 create mode 100644 src/components/language-select.astro
 create mode 100644 src/i18n/engine.ts
 create mode 100644 src/i18n/translations.ts
 create mode 100644 src/stores/i18n.ts

diff --git a/src/components/form.astro b/src/components/form.astro
index 602e265..bbe2540 100644
--- a/src/components/form.astro
+++ b/src/components/form.astro
@@ -13,14 +13,16 @@ const { prefilledText, prefilledInstance } = Astro.props;
 	action="/api/share"
 	method="POST"
 >
-	<label>
+	<label data-translate="postText">
 		Post text
 		<textarea
 			name="text"
 			id="text"
 			rows="7"
-			placeholder="What's on your mind?"
+			placeholder="What’s on your mind?"
 			required
+			data-translate="postTextPlaceholder"
+			data-translate-attribute="placeholder"
 			>{prefilledText}</textarea
 		>
 	</label>
@@ -30,5 +32,7 @@ const { prefilledText, prefilledInstance } = Astro.props;
 	<input
 		type="submit"
 		value="Publish"
+		data-translate="publish"
+		data-translate-attribute="value"
 	/>
 </form>
diff --git a/src/components/instance-select.astro b/src/components/instance-select.astro
index d536e93..47d2fcc 100644
--- a/src/components/instance-select.astro
+++ b/src/components/instance-select.astro
@@ -8,7 +8,7 @@ const { prefilledInstance } = Astro.props;
 ---
 
 <datalist id="popular-instances"></datalist>
-<label>
+<label data-translate="instance">
 	Fediverse instance
 	<div class="instance-input">
 		<span id="https-label">https://</span>
@@ -16,7 +16,6 @@ const { prefilledInstance } = Astro.props;
 			type="text"
 			name="instance"
 			id="instance"
-			placeholder="mastodon.social"
 			list="popular-instances"
 			required
 			aria-describedby="https-label"
@@ -25,15 +24,24 @@ const { prefilledInstance } = Astro.props;
 	</div>
 </label>
 
-<div id="saved-instances"></div>
+<div
+	id="saved-instances"
+	data-translate="previouslyUsed"
+>
+	Previously used:
+	<div></div>
+</div>
 
-<label for="remember">
+<label
+	for="remember"
+	data-translate="rememberInstance"
+>
 	<input
 		type="checkbox"
 		id="remember"
 		name="remember"
 	/>
-	 Remember my instance on this device
+	 Remember instance on this device
 </label>
 
 <style lang="scss">
@@ -61,6 +69,10 @@ const { prefilledInstance } = Astro.props;
 	#saved-instances {
 		margin-bottom: 1rem;
 
+		> div {
+			display: inline-block;
+		}
+
 		:global(span) {
 			color: var(--s2f-accent-color-contrast);
 			cursor: pointer;
@@ -87,8 +99,7 @@ const { prefilledInstance } = Astro.props;
 			instanceElement.value = getUrlDomain(savedInstances[0] as string);
 		}
 
-		document.querySelector("#saved-instances")!.replaceChildren(
-			"Previously used: ",
+		document.querySelector("#saved-instances>div")!.replaceChildren(
 			...savedInstances
 				.flatMap((instance: string) => {
 					if (!instance) {
diff --git a/src/components/language-select.astro b/src/components/language-select.astro
new file mode 100644
index 0000000..270a38b
--- /dev/null
+++ b/src/components/language-select.astro
@@ -0,0 +1,55 @@
+---
+/*!
+ * © 2023 Nikita Karamov
+ * Licensed under AGPL v3 or later
+ */
+import { languages } from "@i18n/translations";
+
+const initialLanguage = "en";
+---
+
+<div>
+	<span data-translate="language">Language:</span>
+	<select
+		name="language"
+		id="language"
+	>
+		{
+			Object.entries(languages).map(([k, v]) => {
+				return (
+					<option
+						selected={k === initialLanguage}
+						value={k}
+					>
+						{v}
+					</option>
+				);
+			})
+		}
+	</select>
+</div>
+
+<script>
+	import { findBestLanguage } from "@i18n/engine";
+	import { applyTranslations } from "@i18n/engine";
+	import { $locale } from "@stores/i18n";
+
+	const select: HTMLSelectElement = document.querySelector("#language")!;
+
+	document.addEventListener("DOMContentLoaded", () => {
+		$locale.subscribe((newLocale) => {
+			if (newLocale === undefined) {
+				newLocale = findBestLanguage();
+			}
+
+			applyTranslations(newLocale);
+			if (select.value !== newLocale) {
+				select.value = newLocale;
+			}
+		});
+
+		select.addEventListener("change", (event) => {
+			$locale.set((event.target as typeof select).value);
+		});
+	});
+</script>
diff --git a/src/i18n/engine.ts b/src/i18n/engine.ts
new file mode 100644
index 0000000..a591ebd
--- /dev/null
+++ b/src/i18n/engine.ts
@@ -0,0 +1,54 @@
+import { strings, defaultLanguage, languages } from "./translations";
+
+export function useTranslations(language: string) {
+	if (!(language in strings)) {
+		language = defaultLanguage;
+	}
+	return function t(
+		key: keyof (typeof strings)[typeof defaultLanguage],
+	): string {
+		return strings[language]![key] || strings[defaultLanguage]![key] || "";
+	};
+}
+
+export function findBestLanguage(): string {
+	let browserLanguages = navigator.languages;
+	if (!navigator.languages) browserLanguages = [navigator.language];
+	for (const language of browserLanguages) {
+		const locale = new Intl.Locale(language);
+		const minimized = locale.minimize();
+
+		for (const candidate of [locale.baseName, minimized.baseName]) {
+			if (candidate in languages) {
+				return candidate;
+			}
+		}
+	}
+
+	return defaultLanguage;
+}
+
+export function applyTranslations(language: string) {
+	const t = useTranslations(language);
+
+	for (const node of document.querySelectorAll("[data-translate]")) {
+		const dataset = (node as HTMLElement).dataset;
+
+		if (dataset.translateAttribute) {
+			node.setAttribute(dataset.translateAttribute, t(dataset.translate!));
+			continue;
+		}
+
+		const splitTranslated = t(dataset.translate!).split("{}");
+		if (splitTranslated.length === 1) {
+			node.innerHTML = t(dataset.translate!);
+			continue;
+		}
+
+		for (const child of node.childNodes) {
+			if (child.nodeType === Node.TEXT_NODE) {
+				child.textContent = splitTranslated.shift() || "";
+			}
+		}
+	}
+}
diff --git a/src/i18n/translations.ts b/src/i18n/translations.ts
new file mode 100644
index 0000000..c2ca4f9
--- /dev/null
+++ b/src/i18n/translations.ts
@@ -0,0 +1,55 @@
+export const languages = {
+	en: "English",
+	de: "Deutsch",
+};
+
+export const strings: Record<keyof typeof languages, Record<string, string>> = {
+	en: {
+		title: "Share₂Fedi — an instance-agnostic share page for the Fediverse",
+		metaDescription:
+			"Share₂Fedi is a share page for Mastodon, Pleroma, Misskey, and others. Type in your post text and the instance URL and click ‘Publish!’",
+		language: "Language:",
+		description:
+			"Share₂Fedi is an instance-agnostic share page for {}. With it, you can post to various federated platforms from a single page.",
+		fediverse: "the Fediverse",
+		supportedProjects: "Supported projects:",
+		incl: "incl.",
+		credits:
+			"Share₂Fedi is developed and maintained by {}. Source code is {}. Hosted with {}. {}.",
+		onGitHub: "on GitHub",
+		statusPage: "Status page",
+		licence: "Licence",
+		privacyNotice: "Privacy Notice",
+		postText: "Post text{}",
+		postTextPlaceholder: "What’s on your mind?",
+		instance: "Fediverse instance{}",
+		previouslyUsed: "Previously used: {}",
+		rememberInstance: "{} Remember instance on this device",
+		publish: "Publish",
+	},
+	de: {
+		title: "Share₂Fedi — eine instanzunabhängige Share-Seite für das Fediverse",
+		metaDescription:
+			"Share₂Fedi ist eine Share-Seite für Mastodon, Pleroma, Misskey und andere. Geben Sie Ihren Beitragstext und die Instanz-URL ein und klicken Sie auf „Veröffentlichen“!",
+		language: "Sprache:",
+		description:
+			"Share₂Fedi ist eine instanzunabhängige Share-Seite für {}. Mit ihr können Sie von einer einzigen Seite aus auf verschiedenen föderierten Plattformen posten.",
+		fediverse: "das Fediverse",
+		supportedProjects: "Unterstützte Projekte:",
+		incl: "inkl.",
+		credits:
+			"Share₂Fedi wird von {} entwickelt und gepflegt. Der Quellcode ist {}. Gehostet mit {}. {}.",
+		onGitHub: "auf GitHub",
+		statusPage: "Statusseite",
+		licence: "Lizenz",
+		privacyNotice: "Datenschutzhinweis",
+		postText: "Beitragstext{}",
+		postTextPlaceholder: "Was gibt’s Neues?",
+		instance: "Fediverse-Instanz{}",
+		previouslyUsed: "Bisher verwendet: {}",
+		rememberInstance: "{} Instanz auf diesem Gerät merken",
+		publish: "Veröffentlichen",
+	},
+} as const;
+
+export const defaultLanguage: keyof typeof strings = "en";
diff --git a/src/layouts/layout.astro b/src/layouts/layout.astro
index 866c53e..00c2a3d 100644
--- a/src/layouts/layout.astro
+++ b/src/layouts/layout.astro
@@ -16,10 +16,12 @@ const { title } = Astro.props;
 			name="viewport"
 			content="width=device-width, initial-scale=1.0"
 		/>
-		<title>{title}</title>
+		<title data-translate="title">{title}</title>
 		<meta
 			name="description"
 			content="Share₂Fedi is a share page for Mastodon, Pleroma, Misskey, and others. Type in your post text and the instance URL and click ‘Publish!’"
+			data-translate="metaDescription"
+			data-translate-attribute="content"
 		/>
 		<link
 			rel="canonical"
diff --git a/src/pages/index.astro b/src/pages/index.astro
index 1bc2e05..59fc5a8 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -8,6 +8,8 @@ import Form from "@components/form.astro";
 import { Content as PrivacyNotice } from "@pages/_privacy.md";
 import { Content as Licence } from "@pages/_licence.md";
 
+import LanguageSelect from "@components/language-select.astro";
+
 const searchParameters = new URL(Astro.request.url).searchParams;
 const prefilledText = searchParameters.get("text");
 const prefilledInstance = searchParameters.get("instance");
@@ -21,6 +23,8 @@ const prefilledInstance = searchParameters.get("instance");
 			width="195"
 			height="60"
 		/>
+
+		<LanguageSelect />
 	</header>
 	<main>
 		<Form
@@ -29,43 +33,53 @@ const prefilledInstance = searchParameters.get("instance");
 		/>
 	</main>
 	<aside>
-		<p>
+		<p data-translate="description">
 			Share₂Fedi is an instance-agnostic share page for
-			<a href="https://en.wikipedia.org/wiki/Fediverse">the Fediverse</a>. With
-			it, you can post to various federated platforms from a single page.
+			<a
+				href="https://en.wikipedia.org/wiki/Fediverse"
+				data-translate="fediverse"
+				>the Fediverse</a
+			>. With it, you can post to various federated platforms from a single
+			page.
 		</p>
-		<p><b>Supported projects:</b></p>
+		<p><b data-translate="supportedProjects">Supported projects:</b></p>
 		<ul>
-			<li>Mastodon (incl. Hometown, Fedibird, GlitchCafé)</li>
 			<li>
-				Pleroma (incl. Akkoma)
+				Mastodon (<span data-translate="incl">incl.</span> Hometown, Fedibird,
+				GlitchCafé)
 			</li>
 			<li>
-				Misskey (incl. Firefish/Calckey, FoundKey, Meisskey)
+				Pleroma (<span data-translate="incl">incl.</span> Akkoma)
 			</li>
 			<li>
-				Friendica
-			</li>
-			<li>
-				Hubzilla
-			</li>
-			<li>
-				GNU Social
+				Misskey (<span data-translate="incl">incl.</span> Firefish/Calckey,
+				FoundKey, Meisskey)
 			</li>
+			<li>Friendica</li>
+			<li>Hubzilla</li>
+			<li>GNU Social</li>
 		</ul>
-		<p>
+		<p data-translate="credits">
 			Share₂Fedi is developed and maintained by
 			<a href="https://www.kytta.dev/">Nikita Karamov</a>. Source code is
-			<a href="https://github.com/kytta/share2fedi">on GitHub</a>. Hosted with
+			<a
+				href="https://github.com/kytta/share2fedi"
+				data-translate="onGitHub"
+				>on GitHub</a
+			>. Hosted with
 			<a href="https://vercel.com">Vercel</a>.
-			<a href="https://stats.uptimerobot.com/QOXj3uXPDX">Status page</a>.
+			<a
+				href="https://stats.uptimerobot.com/QOXj3uXPDX"
+				data-translate="statusPage"
+				>Status page</a
+			>.
 		</p>
 		<details>
-			<summary>Licence</summary>
+			<summary data-translate="licence">Licence</summary>
 			<Licence />
 		</details>
 		<details>
-			<summary>Privacy Notice</summary>
+			<summary data-translate="privacyNotice">Privacy Notice</summary>
 			<PrivacyNotice />
 		</details>
 	</aside>
diff --git a/src/stores/i18n.ts b/src/stores/i18n.ts
new file mode 100644
index 0000000..983257f
--- /dev/null
+++ b/src/stores/i18n.ts
@@ -0,0 +1,3 @@
+import { persistentAtom } from "@nanostores/persistent";
+
+export const $locale = persistentAtom<string | undefined>("locale");
diff --git a/src/styles/main.scss b/src/styles/main.scss
index 870bf56..d7d3397 100644
--- a/src/styles/main.scss
+++ b/src/styles/main.scss
@@ -47,6 +47,9 @@ body {
 
 header {
 	padding: 1rem;
+	display: flex;
+	align-items: center;
+	justify-content: space-between;
 }
 
 main,
diff --git a/tsconfig.json b/tsconfig.json
index 10dbf58..d7d7ad5 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -5,6 +5,7 @@
 		"baseUrl": ".",
 		"paths": {
 			"@components/*": ["src/components/*"],
+			"@i18n/*": ["src/i18n/*"],
 			"@layouts/*": ["src/layouts/*"],
 			"@pages/*": ["src/pages/*"],
 			"@scripts/*": ["src/scripts/*"],