Merge pull request #11 from e-e-e/Frando-pass-db

Frando pass db

Author: e-e-e

index.js

@@ -20,16 +20,15 @@ const PassThrough = stream.PassThrough
 function Graph (storage, key, opts) {
   if (!(this instanceof Graph)) return new Graph(storage, key, opts)
   events.EventEmitter.call(this)
-
   if (typeof key === 'string') key = Buffer.from(key, 'hex')
 
   if (!Buffer.isBuffer(key) && !opts) {
     opts = key
     key = null
   }
 
-  if (!opts) opts = {}
-  this.db = hyperdb(storage, key, opts)
+  opts = opts || {}
+  this.db = (storage instanceof hyperdb) ? storage : hyperdb(storage, key, opts)
   this._prefixes = Object.assign({}, opts.prefixes || constants.DEFAULT_PREFIXES)
   this._basename = opts.name || constants.DEFAULT_BASE
   this._prefixes._ = this._basename

readme.md

@@ -39,6 +39,8 @@ db.put(triple, function (err) {
 
 Returns an instance of hyper-graph-db. Arguments are passed directly to hyperdb, look at its constructor [API](https://github.com/mafintosh/hyperdb#var-db--hyperdbstorage-key-options) for configuration options.
 
+Storage argument can be a Hyperdb instance, a filepath, or a storage object. For an example of storage type objects look at [dat-storage](https://github.com/datproject/dat-storage).
+
 Extra Options:
 ```js
 {

test/basic.spec.js

@@ -19,6 +19,15 @@ function ramStore (filename) {
 
 describe('hypergraph', function () {
   let db
+  describe('constructor storage argument', () => {
+    context('with instance of hyperdb', () => {
+      it('sets graph database to hyperdb passed into the constructor', () => {
+        var hyperdbInstance = hyperdb(ramStore)
+        db = hypergraph(hyperdbInstance)
+        expect(db.db).to.eql(hyperdbInstance)
+      })
+    })
+  })
   context('when newly created it adds metadata to db', () => {
     it('includes graph version', (done) => {
       db = hypergraph(ramStore)