The md2htm is a CLI utility that converts markdown to HTML using bun & pandoc

md2htm.js

#!/usr/bin/env bun
import { parseArgs } from "node:util";

const VERSION = '1.0.0';

const { values, positionals } = parseArgs({
  args: Bun.argv,
  options: {
    file: {
      type: "string",
      short: "f",
    },
    mold: {
      type: "string",
      short: "m",
    },
    title: {
      type: "string",
      short: "t",
    },
    brief: {
      type: "string",
      short: "b",
    },
    help: {
      type: "boolean",
      short: "h",
    },
    version: {
      type: "boolean",
      short: "v",
    },
  },
  strict: true,
  allowPositionals: true,
});

// console.log(values, positionals);

if (values.help) {
  console.log(`Usage:
  md2htm <file> [options]

  i.e.,
    bun run md2htm.js <file> [options]

  where,
    <file>        Provide the filename

Options:
  -m --mold       Provide the webpage template filepath
  -t --title      Provide the webpage title
  -b --brief      Provide the webpage description
  -h --help       Display the help menu
  -v --version    Display the version of app    

Examples:
  md2htm -h
  md2htm help.md -t Help -b "Help manual for web, app & API" -m template.htm
  md2htm help.htm -t Help -b "Help manual for web, app & API" -m template.htm
  `);
} else if (values.version) {
  console.log(`md2htm - markdown to html
Converts markdown to html using bun & pandoc 
Version ${VERSION}`);
} else {
  const filePath = positionals[2];
  const fileExt = filePath.substring(filePath.lastIndexOf("."));
  let fileContent;

  if (fileExt == ".md") {
    const proc = Bun.spawn(["pandoc", "-f", "markdown", filePath]);
    fileContent = await new Response(proc.stdout).text();
  } else {
    const fileRef = Bun.file(filePath);
    fileContent = await fileRef.text();
  }

  if (!!values.mold) {
    const templateRef = Bun.file(values.mold);
    let targetContent = await templateRef.text();

    targetContent = targetContent
      .replace("{{content}}", fileContent)
      .replace("{{title}}", values.title || "")
      .replace("{{brief}}", values.brief || "");

    await Bun.write(`${filePath}.html`, targetContent);
    console.log("Success!");
  } else {
    console.log("Failed! Template file is missing.");
  }
}