index.ts


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import showdown from "showdown";
import yaml from "yaml";
import { promises as fs } from "fs";

const posts = await fs.readdir("posts");

function splitPostHeader(postData: string): [string, string] {
  if (postData.startsWith("---\n")) {
    const headerEndIndex = postData.indexOf("\n---\n", 4);

    return [
      postData.substring(4, headerEndIndex),
      postData.substring(headerEndIndex + 5),
    ];
  }
  return ["", postData];
}

await fs.rm("build", { recursive: true });
await fs.mkdir("build");

for (let postPath of posts) {
  const totalPostPath = `posts/${postPath}`;
  if (!postPath.endsWith(".md")) {
    await fs.copyFile(totalPostPath, `build/${postPath}`);
    continue;
  }
  const postText = await fs.readFile(totalPostPath, { encoding: "utf-8" });
  const [postHeader, postBody] = splitPostHeader(postText);
  const postMetadata = yaml.parse(postHeader);
  const converter = new showdown.Converter();
  const htmlBody = converter.makeHtml(postBody);

  const primitiveHtmlDocument = `
<html>
    <head>
        <title>${postMetadata.name}</title>
    </head>
    <body>
        ${htmlBody}
    </body>
</html>`;
  const targetPath = `build/${postPath.replace(".md", ".html")}`;
  fs.writeFile(targetPath, primitiveHtmlDocument, { encoding: "utf-8" });
}