.

wcfs/internal/zdata/δftail.go

@@ -19,6 +19,9 @@
 
 package zdata
 
+// XXX note about ΔFtail organization: queries results are built on the fly to
+// avoid complexity of recomputing vδF on tracking set change.
+
 import (
 	"context"
 	"fmt"
@@ -78,8 +81,8 @@ type setOid = set.Oid
 type ΔFtail struct {
 	// ΔFtail merges ΔBtail with history of ZBlk
 	δBtail  *xbtree.ΔBtail
-	fileIdx map[zodb.Oid]setOid   // tree-root -> {} ZBigFile<oid> as of @head
-	rootIdx map[zodb.Oid]zodb.Oid // file -> tree-root
+	fileIdx map[zodb.Oid]setOid   // tree-root -> {} ZBigFile<oid>  as of @head
+	rootIdx map[zodb.Oid]zodb.Oid // file -> tree-root              as of @head
 
 	trackSetZFile setOid                  // set of tracked ZBigFiles	as of @head
 	trackSetZBlk  map[zodb.Oid]*zblkTrack // zblk -> {} root -> {}blk	as of @head
@@ -104,10 +107,6 @@ type ΔFile struct {
 	Size   bool   // whether file size changed	XXX -> ΔSize?
 }
 
-// XXX note about ΔFtail organization: queries results are built on the fly to
-// avoid complexity of recomputing vδF on tracking set change.
-
-
 // NewΔFtail creates new ΔFtail object.
 //
 // Initial tracked set is empty.
@@ -334,6 +333,10 @@ func (δFtail *ΔFtail) Update(δZ *zodb.EventCommit) (_ ΔF, err error) {
 
 		_ = δ
 		//fmt.Printf("δZBigFile: %v\n", δ)
+
+		// XXX update .fileIdx
+		// XXX update .rootIdx
+		// XXX update .trackSetZBlk ?
 	}
 
 //	fmt.Printf("-> δF: %v\n", δF)

wcfs/internal/zdata/δftail_test.go

@@ -222,6 +222,9 @@ func testΔFtail(t_ *testing.T, testq chan ΔFTestEntry) {
 	// δfstr/vδfstr converts δf/vδf to string taking xat into account
 	δfstr := func(δf *ΔFile) string {
 		s := fmt.Sprintf("@%s·%s", xat[δf.Rev], δf.Blocks)
+		if δf.Epoch {
+			s += "E"
+		}
 		if δf.Size {
 			s += "S"
 		}