docpress/lib/delegate_bin.js

Documentation website generator

const join = require('path').join
const resolve = require('path').resolve
const spawnSync = require('child_process').spawnSync

/**
 * Delegates to a the local version of an executable if available.
 */

module.exports = function delegateBin (mod, bin) {
  var binPath = join(process.cwd(), 'node_modules', mod, bin)

  if (exists(binPath) && resolve(process.argv[1]) !== resolve(binPath)) {
    var node = process.argv[0] // /usr/bin/node
    var args = [binPath].concat(process.argv.slice(2))
    var result = spawnSync(node, args, { stdio: 'inherit' })
    if (result.error) {
      console.error('! Error: failed to invoke ' + bin + ' from node_modules.')
      console.error('  ' + result.error.message)
      process.exit(result.status || 1)
    }
    process.exit(result.status)
  }
}

function exists (filename) {
  try {
    return require('fs').statSync(filename)
  } catch (e) {}
}