@maizzle/framework/dist/render/plugins/markdownExtract.js

Maizzle is a framework that helps you quickly build HTML emails with Tailwind CSS.

import { readFileSync } from "node:fs";
import { dirname, resolve } from "node:path";
//#region src/render/plugins/markdownExtract.ts
/**
* Vite plugin that pre-processes <Markdown> tags:
* - Extracts slot content, dedents it, and passes as :content prop
* - Resolves `src` prop to read file contents at build time
*/
function markdownExtract() {
	const re = /<(Markdown|markdown)((?:\s[^>]*?)?)>([\s\S]*?)<\/\1>/g;
	const selfClosingRe = /<(Markdown|markdown)((?:\s[^>]*?\bsrc\s*=\s*"[^"]*"[^>]*?))\/>/g;
	return {
		name: "maizzle:markdown-extract",
		enforce: "pre",
		transform(code, id) {
			if (!id.endsWith(".vue") && !id.endsWith(".md")) return;
			if (!code.includes("Markdown") && !code.includes("markdown")) return;
			let transformed = code;
			transformed = transformed.replace(re, (_match, tag, attrs, content) => {
				if (/(?:^|\s):?content\b/.test(attrs) || /v-bind:content\b/.test(attrs)) return _match;
				const stripped = content.replace(/^\n+/, "").replace(/\s+$/, "");
				if (!stripped) return _match;
				const minIndent = stripped.match(/^[ \t]*(?=\S)/gm)?.reduce((min, ws) => Math.min(min, ws.length), Infinity) ?? 0;
				return `<${tag}${attrs} content="${(minIndent > 0 ? stripped.replace(new RegExp(`^[ \\t]{${minIndent}}`, "gm"), "") : stripped).replace(/&/g, "&amp;").replace(/"/g, "&quot;").replace(/</g, "&lt;").replace(/>/g, "&gt;")}" />`;
			});
			transformed = transformed.replace(selfClosingRe, (_match, tag, attrs) => {
				const srcMatch = attrs.match(/\bsrc\s*=\s*"([^"]*)"/);
				if (!srcMatch) return _match;
				const srcPath = srcMatch[1];
				const resolvedPath = resolve(dirname(id), srcPath);
				let fileContent;
				try {
					fileContent = readFileSync(resolvedPath, "utf-8").trim();
				} catch {
					return _match;
				}
				return `<${tag}${attrs.replace(/\s*\bsrc\s*=\s*"[^"]*"/, "").replace(/\s*\bcontent\s*=\s*"[^"]*"/, "")} content="${fileContent.replace(/&/g, "&amp;").replace(/"/g, "&quot;").replace(/</g, "&lt;").replace(/>/g, "&gt;")}" />`;
			});
			if (transformed !== code) return {
				code: transformed,
				map: null
			};
		}
	};
}
//#endregion
export { markdownExtract };

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