text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  
  const { promises: fs } = require('fs');
  const path = require('path');
  const unified = require('unified');
  const markdown = require('remark-parse');
  const remark2rehype = require('remark-rehype');
  const raw = require('rehype-raw');
  const htmlStringify = require('rehype-stringify');
  
  const { replaceLinks } = require('./markdown');
  const linksMapper = require('./links-mapper');
  const html = require('./html');
  const json = require('./json');
  
  // Parse the args.
  // Don't use nopt or whatever for this. It's simple enough.
  
  const args = process.argv.slice(2);
  let filename = null;
  let nodeVersion = null;
  let outputDir = null;
  let apilinks = {};
  let versions = {};
  
  async function main() {
    for (const arg of args) {
      if (!arg.startsWith('--')) {
        filename = arg;
      } else if (arg.startsWith('--node-version=')) {
        nodeVersion = arg.replace(/^--node-version=/, '');
      } else if (arg.startsWith('--output-directory=')) {
        outputDir = arg.replace(/^--output-directory=/, '');
      } else if (arg.startsWith('--apilinks=')) {
        const linkFile = arg.replace(/^--apilinks=/, '');
        const data = await fs.readFile(linkFile, 'utf8');
        if (!data.trim()) {
          throw new Error(`${linkFile} is empty`);
        }
        apilinks = JSON.parse(data);
      } else if (arg.startsWith('--versions-file=')) {
        const versionsFile = arg.replace(/^--versions-file=/, '');
        const data = await fs.readFile(versionsFile, 'utf8');
        if (!data.trim()) {
          throw new Error(`${versionsFile} is empty`);
        }
        versions = JSON.parse(data);
      }
    }
  
    nodeVersion = nodeVersion || process.version;
  
    if (!filename) {
      throw new Error('No input file specified');
    } else if (!outputDir) {
      throw new Error('No output directory specified');
    }
  
    const input = await fs.readFile(filename, 'utf8');
  
    const content = await unified()
      .use(replaceLinks, { filename, linksMapper })
      .use(markdown)
      .use(html.preprocessText, { nodeVersion })
      .use(json.jsonAPI, { filename })
      .use(html.firstHeader)
      .use(html.preprocessElements, { filename })
      .use(html.buildToc, { filename, apilinks })
      .use(remark2rehype, { allowDangerousHTML: true })
      .use(raw)
      .use(htmlStringify)
      .process(input);
  
    const myHtml = await html.toHTML({ input, content, filename, nodeVersion,
                                       versions });
    const basename = path.basename(filename, '.md');
    const htmlTarget = path.join(outputDir, `${basename}.html`);
    const jsonTarget = path.join(outputDir, `${basename}.json`);
  
    return Promise.allSettled([
      fs.writeFile(htmlTarget, myHtml),
      fs.writeFile(jsonTarget, JSON.stringify(content.json, null, 2)),
    ]);
  }
  
  main()
    .then((tasks) => {
      // Filter rejected tasks
      const errors = tasks.filter(({ status }) => status === 'rejected')
        .map(({ reason }) => reason);
  
      // Log errors
      for (const error of errors) {
        console.error(error);
      }
  
      // Exit process with code 1 if some errors
      if (errors.length > 0) {
        return process.exit(1);
      }
  
      // Else with code 0
      process.exit(0);
    })
    .catch((error) => {
      console.error(error);
  
      process.exit(1);
    });
  