fix files.add promises

Author: daviddias

package.json

@@ -33,7 +33,7 @@
     "aegir": "^3.2.0",
     "chai": "^3.5.0",
     "gulp": "^3.9.1",
-    "interface-ipfs-core": "^0.3.0",
+    "interface-ipfs-core": "^0.3.1",
     "ipfsd-ctl": "^0.14.0",
     "pre-commit": "^1.1.2",
     "stream-equal": "^0.1.8",
@@ -94,4 +94,4 @@
     "url": "https://github.com/ipfs/js-ipfs-api/issues"
   },
   "homepage": "https://github.com/ipfs/js-ipfs-api"
-}
+}

src/api/add.js

@@ -2,24 +2,20 @@
 
 const isStream = require('isstream')
 const addToDagNodesTransform = require('../add-to-dagnode-transform')
+const promisify = require('promisify-es6')
 
 module.exports = (send) => {
-  return function add (files, opts, cb) {
-    if (typeof (opts) === 'function' && cb === undefined) {
-      cb = opts
-      opts = {}
-    }
-
+  return promisify((files, callback) => {
     const good = Buffer.isBuffer(files) ||
                isStream.isReadable(files) ||
                Array.isArray(files)
 
     if (!good) {
-      return cb(new Error('"files" must be a buffer, readable stream, or array of objects'))
+      callback(new Error('"files" must be a buffer, readable stream, or array of objects'))
     }
 
-    var sendWithTransform = send.withTransform(addToDagNodesTransform)
+    const sendWithTransform = send.withTransform(addToDagNodesTransform)
 
-    return sendWithTransform('add', null, opts, files, cb)
-  }
+    sendWithTransform('add', null, {}, files, callback)
+  })
 }