resources: Add proper edge compare method

Might as well do this cleanly in one place.

lib/main.go

@@ -495,7 +495,7 @@ func (obj *Main) Run() error {
 			edgeCmpFn := func(e1, e2 pgraph.Edge) (bool, error) {
 				edge1 := e1.(*resources.Edge) // panic if wrong
 				edge2 := e2.(*resources.Edge) // panic if wrong
-				return edge1.Name == edge2.Name && edge1.Notify == edge2.Notify, nil // simple cmp
+				return edge1.Compare(edge2), nil
 			}
 			// on success, this updates the receiver graph...
 			if err := oldGraph.GraphSync(newGraph, vertexCmpFn, vertexAddFn, vertexRemoveFn, edgeCmpFn); err != nil {

resources/autogroup.go

@@ -146,6 +146,7 @@ func (ag *baseGrouper) vertexMerge(v1, v2 pgraph.Vertex) (v pgraph.Vertex, err e
 }
 
 func (ag *baseGrouper) edgeMerge(e1, e2 pgraph.Edge) pgraph.Edge {
+	// FIXME: should we merge the edge.Notify or edge.refresh values?
 	return e1 // noop
 }
 

resources/edge.go

@@ -30,6 +30,21 @@ func (obj *Edge) String() string {
 	return obj.Name
 }
 
+// Compare returns true if two edges are equivalent. Otherwise it returns false.
+func (obj *Edge) Compare(edge *Edge) bool {
+	if obj.Name != edge.Name {
+		return false
+	}
+	if obj.Notify != edge.Notify {
+		return false
+	}
+	// FIXME: should we compare this as well?
+	//if obj.refresh != edge.refresh {
+	//	return false
+	//}
+	return true
+}
+
 // Refresh returns the pending refresh status of this edge.
 func (obj *Edge) Refresh() bool {
 	return obj.refresh