lodb/src/utils.js

Flat JSON file database, fork of lowdb

var fs = require('fs')
var path = require('path')
var _ = require('lodash')
var steno = require('steno')

function getTempFile(file) {
  return path.join(
    path.dirname(file),
    '.' + path.basename(file) + '~'
  )
}

module.exports = {
  // Read or create file and return object
  // If no file is provided return an empty object
  getObject: function (file, parse) {
    if (file) {
      if (fs.existsSync(file)) {
        return parse(fs.readFileSync(file))
      } else {
        fs.writeFileSync(file, '{}')
        return {}
      }
    } else {
      return {}
    }
  },

  saveAsync: function(file, data) {
    steno(getTempFile(file)).setCallback(function(err, data, next) {
      if (err) throw err
      fs.rename(this.filename, file, function(err) {
        if (err) throw err
        next()
      })
    })
    steno(getTempFile(file)).write(data)
  },

  saveSync: function(file, data) {
    fs.writeFileSync(getTempFile(file), data)
    fs.renameSync(getTempFile(file), file)
  }
}