Inline imgs to markdown

md-inline.js

var fs = require('fs');

// Read file passed in command line args
var f = fs.readFileSync(process.argv[2],'utf8');

// Replace markdown img regex with <img> with base64 data uri & pipe to stdout
var re =/!\[\]\(([^]*?)\)/g;
process.stdout.write(f.replace(re, replaceImagesWithBase64));

/**
 * Helper function to replace a markdown img with <img> tag with data uri
 * @param {string} match the markdown img
 * @param {string} p1 the filename of the img src
 * @returns {string} the converted <img> tag with data uri
 */
function replaceImagesWithBase64(match, p1) {
  return (
    // Check the filename to see if it's a URL, and if so, ignore it
    p1.substr(0,4) === "http" ? match :

      // Otherwise, it's a local file that should be replaced with base64 encoding
      "<img src='data:image/png;base64," + fs.readFileSync(p1,'base64') + "'/>"
    )
}