39 lines
1.7 KiB
TypeScript
39 lines
1.7 KiB
TypeScript
import { readFile } from "node:fs/promises";
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import { dirname, join } from "node:path";
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import { fileURLToPath } from "node:url";
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import type { Integration, IntegrationContext } from "muddle/contracts";
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import { renderMarkdown } from "muddle/markdown";
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import katex from "katex";
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export function renderLatex(source: string, displayMode = false): string {
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return katex.renderToString(source, { displayMode, throwOnError: false, trust: false });
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}
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export function renderMathMarkdown(source: string): string {
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const formulas: string[] = [];
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const body = source.replace(/\$\$([\s\S]+?)\$\$|(?<!\\)\$([^$\n]+?)\$/g, (_match, display, inline) => {
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formulas.push(renderLatex(display ?? inline, display !== undefined));
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return `MUDDLEMATH${formulas.length - 1}END`;
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});
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return renderMarkdown(body).replace(/MUDDLEMATH(\d+)END/g, (_match, index) => formulas[Number(index)] ?? "");
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}
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export interface LatexIntegrationOptions { route?: string }
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export function latexIntegration(options: LatexIntegrationOptions = {}): Integration {
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const route = options.route ?? "/_muddle/katex.css";
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return {
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name: "latex",
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async setup(context: IntegrationContext) {
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const base = dirname(fileURLToPath(import.meta.resolve("katex/package.json")));
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const css = await readFile(join(base, "dist", "katex.min.css"), "utf8");
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context.loader("latex-markdown", {
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name: "latex-markdown",
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extensions: [".latex.md", ".latex.markdown"],
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load(file) { return { data: {}, content: renderMathMarkdown(file.source) }; },
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});
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context.route("GET", route, () => new Response(css, { headers: { "content-type": "text/css; charset=utf-8", "cache-control": "public, max-age=31536000, immutable" } }));
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},
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};
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}
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