feat(plugin): ShikiCodeblocks (#267)

Co-authored-by: ArjixWasTaken <53124886+ArjixWasTaken@users.noreply.github.com>
Co-authored-by: Ven <vendicated@riseup.net>

1 files changed, 119 insertions, 0 deletions

diff --git a/src/plugins/shikiCodeblocks/api/shiki.ts b/src/plugins/shikiCodeblocks/api/shiki.ts
new file mode 100644
index 0000000..e7691ce
--- /dev/null
+++ b/src/plugins/shikiCodeblocks/api/shiki.ts
@@ -0,0 +1,119 @@
+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2022 Vendicated and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+
+import { shikiOnigasmSrc, shikiWorkerSrc } from "@utils/dependencies";
+import { WorkerClient } from "@vap/core/ipc";
+import type { IShikiTheme, IThemedToken } from "@vap/shiki";
+
+import { dispatchTheme } from "../hooks/useTheme";
+import type { ShikiSpec } from "../types";
+import { getGrammar, languages, loadLanguages, resolveLang } from "./languages";
+import { themes } from "./themes";
+
+const themeUrls = Object.values(themes);
+
+let resolveClient: (client: WorkerClient<ShikiSpec>) => void;
+
+export const shiki = {
+    client: null as WorkerClient<ShikiSpec> | null,
+    currentTheme: null as IShikiTheme | null,
+    currentThemeUrl: null as string | null,
+    timeoutMs: 10000,
+    languages,
+    themes,
+    loadedThemes: new Set<string>(),
+    loadedLangs: new Set<string>(),
+    clientPromise: new Promise<WorkerClient<ShikiSpec>>(resolve => resolveClient = resolve),
+
+    init: async (initThemeUrl: string | undefined) => {
+        /** https://stackoverflow.com/q/58098143 */
+        const workerBlob = await fetch(shikiWorkerSrc).then(res => res.blob());
+
+        const client = shiki.client = new WorkerClient<ShikiSpec>(
+            "shiki-client",
+            "shiki-host",
+            workerBlob,
+            { name: "ShikiWorker" },
+        );
+        await client.init();
+
+        const themeUrl = initThemeUrl || themeUrls[0];
+
+        await loadLanguages();
+        await client.run("setOnigasm", { wasm: shikiOnigasmSrc });
+        await client.run("setHighlighter", { theme: themeUrl, langs: [] });
+        shiki.loadedThemes.add(themeUrl);
+        await shiki._setTheme(themeUrl);
+        resolveClient(client);
+    },
+    _setTheme: async (themeUrl: string) => {
+        shiki.currentThemeUrl = themeUrl;
+        const { themeData } = await shiki.client!.run("getTheme", { theme: themeUrl });
+        shiki.currentTheme = JSON.parse(themeData);
+        dispatchTheme({ id: themeUrl, theme: shiki.currentTheme });
+    },
+    loadTheme: async (themeUrl: string) => {
+        const client = await shiki.clientPromise;
+        if (shiki.loadedThemes.has(themeUrl)) return;
+
+        await client.run("loadTheme", { theme: themeUrl });
+
+        shiki.loadedThemes.add(themeUrl);
+    },
+    setTheme: async (themeUrl: string) => {
+        await shiki.clientPromise;
+        themeUrl ||= themeUrls[0];
+        if (!shiki.loadedThemes.has(themeUrl)) await shiki.loadTheme(themeUrl);
+
+        await shiki._setTheme(themeUrl);
+    },
+    loadLang: async (langId: string) => {
+        const client = await shiki.clientPromise;
+        const lang = resolveLang(langId);
+
+        if (!lang || shiki.loadedLangs.has(lang.id)) return;
+
+        await client.run("loadLanguage", {
+            lang: {
+                ...lang,
+                grammar: lang.grammar ?? await getGrammar(lang),
+            }
+        });
+        shiki.loadedLangs.add(lang.id);
+    },
+    tokenizeCode: async (code: string, langId: string): Promise<IThemedToken[][]> => {
+        const client = await shiki.clientPromise;
+        const lang = resolveLang(langId);
+        if (!lang) return [];
+
+        if (!shiki.loadedLangs.has(lang.id)) await shiki.loadLang(lang.id);
+
+        return await client.run("codeToThemedTokens", {
+            code,
+            lang: langId,
+            theme: shiki.currentThemeUrl ?? themeUrls[0],
+        });
+    },
+    destroy() {
+        shiki.currentTheme = null;
+        shiki.currentThemeUrl = null;
+        dispatchTheme({ id: null, theme: null });
+        shiki.client?.destroy();
+    }
+};