Add imports file to root; expansion welcome

graph/path/path.go

@@ -194,7 +194,7 @@ func isMorphism(nodes ...string) morphism {
 				}
 				sub = fixed
 			}
-			and := iterator.NewAnd()
+			and := iterator.NewAnd(qs)
 			and.AddSubIterator(sub)
 			and.AddSubIterator(it)
 			return and
@@ -240,8 +240,8 @@ func iteratorMorphism(it graph.Iterator) morphism {
 	return morphism{
 		"iterator",
 		func() morphism { return iteratorMorphism(it) },
-		func(_ graph.QuadStore, subIt graph.Iterator) graph.Iterator {
-			and := iterator.NewAnd()
+		func(qs graph.QuadStore, subIt graph.Iterator) graph.Iterator {
+			and := iterator.NewAnd(qs)
 			and.AddSubIterator(it)
 			and.AddSubIterator(subIt)
 			return and
@@ -255,7 +255,7 @@ func andMorphism(p *Path) morphism {
 		func() morphism { return andMorphism(p) },
 		func(qs graph.QuadStore, it graph.Iterator) graph.Iterator {
 			subIt := p.BuildIteratorOn(qs)
-			and := iterator.NewAnd()
+			and := iterator.NewAnd(qs)
 			and.AddSubIterator(it)
 			and.AddSubIterator(subIt)
 			return and
@@ -294,7 +294,7 @@ func exceptMorphism(p *Path) morphism {
 		func(qs graph.QuadStore, base graph.Iterator) graph.Iterator {
 			subIt := p.BuildIteratorOn(qs)
 			notIt := iterator.NewNot(subIt, qs.NodesAllIterator())
-			and := iterator.NewAnd()
+			and := iterator.NewAnd(qs)
 			and.AddSubIterator(base)
 			and.AddSubIterator(notIt)
 			return and
@@ -308,7 +308,7 @@ func inOutIterator(viaPath *Path, it graph.Iterator, reverse bool) graph.Iterato
 		in, out = out, in
 	}
 	lto := iterator.NewLinksTo(viaPath.qs, it, in)
-	and := iterator.NewAnd()
+	and := iterator.NewAnd(viaPath.qs)
 	and.AddSubIterator(iterator.NewLinksTo(viaPath.qs, viaPath.BuildIterator(), quad.Predicate))
 	and.AddSubIterator(lto)
 	return iterator.NewHasA(viaPath.qs, and, out)

graph/quadwriter.go

@@ -45,8 +45,8 @@ type Delta struct {
 }
 
 type Handle struct {
-	QuadStore  QuadStore
-	QuadWriter QuadWriter
+	QuadStore
+	QuadWriter
 }
 
 type IgnoreOpts struct {

imports.go

@@ -0,0 +1,44 @@
+package cayley
+
+import (
+	"github.com/google/cayley/graph"
+	_ "github.com/google/cayley/graph/memstore"
+	"github.com/google/cayley/graph/path"
+	"github.com/google/cayley/quad"
+	_ "github.com/google/cayley/writer"
+)
+
+type Iterator graph.Iterator
+type QuadStore graph.QuadStore
+type QuadWriter graph.QuadWriter
+
+type Path path.Path
+
+type Quad quad.Quad
+
+var StartMorphism = path.StartMorphism
+var StartPath = path.StartPath
+
+var RawNext = graph.Next
+
+type Handle struct {
+	graph.QuadStore
+	graph.QuadWriter
+}
+
+func NewMemoryGraph() (*Handle, error) {
+	qs, err := graph.NewQuadStore("memstore", "", nil)
+	if err != nil {
+		return nil, err
+	}
+	qw, err := graph.NewQuadWriter("single", qs, nil)
+	if err != nil {
+		return nil, err
+	}
+	return &Handle{qs, qw}, nil
+}
+
+func (h *Handle) Close() {
+	h.QuadStore.Close()
+	h.QuadWriter.Close()
+}