pandoc.js

import exec from "../util/exec";
import fs from "fs";
import { merge } from "merge-anything";
import { mkTempFile } from "../util/tempdir";
import parallel from "../util/parallel";
import path from "path";
import PluginError from "plugin-error";
import { promisify } from "util";

const writeFile = promisify(fs.writeFile);
const exists = promisify(fs.exists);

const PLUGIN_NAME = "pandoc";

const DEFAULTS = {
  slideLevel: 2,
  tocDepth: 2,
  revealJSURL: "reveal.js",
  template: path.normalize(__dirname + "/../../templates/revealjs.html"),
  variables: {
    width: 960,
    height: 700,
    navigationMode: "linear",
    theme: "inrae",
    slideNumber: true,
    history: true,
    fragmentInURL: true,
  },
};

/**
 * @param {string} url
 * @return {function}
 */
export function getRevealJSResolver(url) {
  if (url.match(/^(https?:)?\/\//i)) {
    return () => url;
  }
  return (output) => path.relative(path.dirname(output.relative), url);
}

/**
 * @param {import("vinyl")} input
 * @param {string} path
 * @return {Promise<void>|never}
 * @throws PluginError
 */
async function writeToDisk(input, path) {
  if (input.isStream()) {
    const write = fs.createWriteStream(path);
    const done = new Promise((resolve, reject) => {
      write.on("close", () => resolve());
      input.on("error", reject);
      write.on("error", reject);
    });
    input.contents.pipe(write);
    return done;
  }

  if (input.isBuffer()) {
    return writeFile(path, input.contents, {});
  }

  throw new PluginError(PLUGIN_NAME, `cannot handle input ${input.inspect()}`);
}

/**
 * @param {import("vinyl")} input
 * @return {import("vinyl")}
 * @throws PluginError