config.js

var R = require('ramda')

var defaultConfig = {
  Neo4J: {
    hostname: 'localhost',
    port: 7474
  },

  batchTimeout: 1000,
  batchSize: 2500,

  // behave like a graph with equivalences
  types: {
    node: {
      node: {}
    },
    arc: {
      arc: {}
    },
    equivalence: {
      equivalence: {}
    }
  }
}

function detectDockerLink () {
  var addr = process.env.NEO4J_PORT_7474_TCP_ADDR
  var port = process.env.NEO4J_PORT_7474_TCP_PORT

  // found docker links, create and return config
  if (addr && port) {
    return {
      Neo4J: {
        hostname: addr,
        port: port
      }
    }
  }
}

module.exports = function (userConfig) {
  // store configuration with user overrides
  var conf = R.merge(defaultConfig, userConfig || {})

  // detect docker links
  var dockerConf = detectDockerLink()

  // override user config with docker link config
  return R.merge(conf, dockerConf)
}