mbed-creole-to-md/creole2md.js

Transforms mbed-flavoured Creole (from stdin) into Markdown

#!/usr/bin/env node

'use strict';

const toMarkdown = require('to-markdown');
const childProcess = require('child_process');
const fs = require('fs');
const Path = require('path');
const promisify = require('es6-promisify');
const co = require('co');

process.stdin.resume();
process.stdin.setEncoding('utf8');

let article = '';

let stdinTimeout = setTimeout(() => {
  console.warn('No data received on stdin... Shutting down.');
  process.exit(1);
}, 2000);

function asyncExec() {
  let args = [].slice.call(arguments);

  return new Promise((res, rej) => {
    args.push((err, stdout, stderr) => {
      if (err) return rej(err);
      return res({
        stdout: stdout,
        stderr: stderr
      });
    });

    childProcess.exec.apply(childProcess, args);
  });
}

var go = co.wrap(function*() {
  clearTimeout(stdinTimeout);

  let file = Path.join(__dirname, (+new Date()) + '.tmp.creole');

  yield promisify(fs.writeFile.bind(fs))(file, article, 'utf-8');

  let pyOutput = yield asyncExec(`python creole2html.py "${file}"`, {
    cwd: __dirname
  });

  if (pyOutput.stderr) {
    throw 'creole2html failed: ' + pyOutput.stderr;
  }

  yield promisify(fs.unlink.bind(fs))(file);

  return toMarkdown(pyOutput.stdout);
});

process.stdin.on('data', chunk => {
  article += chunk;
});

process.stdin.on('end', function() {
  go()
    .then(output => console.log(output))
    .catch(err => console.error('Creole2md.js failed: ' + err));
});