.

wcfs/internal/zdata/δftail.go

@@ -589,9 +589,8 @@ func (δFtail *ΔFtail) SliceByFileRev(zfile *ZBigFile, lo, hi zodb.Tid) /*reado
 	// query .δBtail.SliceByRootRev(file.blktab, lo, hi) +
 	// merge δZBlk history with that.
 
-
 	// merging tree (δT) and Zblk (δZblk) histories into file history (δFile):
-
+	//
 	//     δT	────────·──────────────·─────────────────·────────────
 	//		        │              │
 	//		        ↓              │
@@ -675,7 +674,7 @@ func (δFtail *ΔFtail) SliceByFileRev(zfile *ZBigFile, lo, hi zodb.Tid) /*reado
 		} else {
 			δE := vδE[ie+1]
 			root = δE.oldRoot
-			head = δE.Rev - 1 // XXX ok?
+			head = δE.Rev - 1 // TODO better set to exact revision coming before this epoch
 			for zblk, inblk := range δE.oldTrackSetZBlk {
 				Zinblk[zblk] = inblk.Clone()
 			}
@@ -702,7 +701,7 @@ func (δFtail *ΔFtail) SliceByFileRev(zfile *ZBigFile, lo, hi zodb.Tid) /*reado
 		//	at3   δTø              δD{c,d,e}	δ{0,1,2}
 		//	at4   δTø              δD{c,e}		δ{  1,2}
 		//
-		// if tracked={0} for (at1,at4] query changes to 1 should be
+		// if tracked={0}, for (at1,at4] query, changes to 1 should be
 		// also all present @at2, @at3 and @at4 - because @at2 both 0
 		// and 1 are changed in the same tracked bucket. Note that
 		// changes to 2 should not be present at all.
@@ -951,7 +950,7 @@ type _ΔZBigFile struct {
 	blktabOld,  blktabNew  zodb.Oid
 }
 func zfilediff(db *zodb.DB, foid zodb.Oid, old, new zodb.Tid) (δ *_ΔZBigFile, err error) {
-	txn, ctx := transaction.New(context.TODO()) // XXX - merge in ctx arg?
+	txn, ctx := transaction.New(context.TODO()) // TODO - merge in cancel via ctx arg
 	defer txn.Abort()
 	zconnOld, err := db.Open(ctx, &zodb.ConnOptions{At: old})
 	if err != nil {