ia markdown content blocks transclude

transclude.js

const fs = require("fs");
const path = require("path");
const isDirectory = require("is-directory");
const isFile = require("is-file");
const fm = require("front-matter");
const arg = path.join(__dirname, process.argv[2]);
const regex = /^\/.*\.*/;
const readline = require("readline");

const iscontentblock = (str) => regex.test(str);

async function processLineByLine(file) {
  const fileStream = fs.createReadStream(file);
  const rl = readline.createInterface({
    input: fileStream,
    crlfDelay: Infinity,
  });

  for await (const line of rl) {
    if (iscontentblock(line)) {
      const possiblefile = path.join(path.dirname(arg), line);
      isFile.sync(possiblefile) && (await processLineByLine(possiblefile));
    } else {
      if (line.indexOf("#") > -1) {
        console.log("\n\n");
      }
      console.log(line);
    }
  }
}

isFile.sync(arg) && (await processLineByLine(arg));
isDirectory.sync(arg) &&
  fs
    .readdirSync(arg)
    .filter((s) => s.indexOf(".md") > -1)
    .map((s) => processfile(s));