mermaid/lib/index.js

var os = require('os'),
  fs = require('fs'),
  path = require('path'),
  spawn = require('child_process').spawn

var mkdirp = require('mkdirp')

var phantomscript = path.join(__dirname, 'phantomscript.js')

module.exports = { process: processMermaid }

function processMermaid (files, _options, _next) {
  var options = _options || {},
    outputDir = options.outputDir || process.cwd(),
    outputSuffix = options.outputSuffix || '',
    next = _next || function () {},
    phantomArgs = [
      phantomscript,
      outputDir,
      options.png,
      options.svg,
      options.css,
      options.sequenceConfig,
      options.ganttConfig,
      options.verbose,
      options.width,
      outputSuffix
    ]

  files.forEach(function (file) {
    phantomArgs.push(file)
  })

  mkdirp(outputDir, function (err) {
    if (err) {
      throw err
    }
    phantom = spawn(options.phantomPath, phantomArgs)

    phantom.on('exit', next)

    phantom.stderr.pipe(process.stderr)
    phantom.stdout.pipe(process.stdout)
  })
}