deltas try to remember filename, lineno

src/ledger/transaction.go

@@ -110,6 +110,9 @@ type transaction struct {
 	payee       string
 	recipients  []transactionRecipient
 	name        string
+
+	fileName string
+	lineNo   int
 }
 
 func (t transaction) empty() bool {
@@ -126,7 +129,7 @@ type transactionRecipient struct {
 func (t transaction) deltas() Deltas {
 	result := []Delta{}
 	sums := map[string]float64{}
-	for _, recipient := range t.recipients {
+	for i, recipient := range t.recipients {
 		sums[recipient.currency] += recipient.value
 		result = append(result, newDelta(
 			t.name,
@@ -137,6 +140,8 @@ func (t transaction) deltas() Deltas {
 			recipient.value,
 			recipient.currency,
 			recipient.isSet,
+			t.fileName,
+			t.lineNo+i,
 		))
 	}
 	for currency, value := range sums {
@@ -155,6 +160,8 @@ func (t transaction) deltas() Deltas {
 				-1.0*value,
 				currency,
 				false,
+				t.fileName,
+				t.lineNo,
 			))
 		}
 	}
@@ -194,6 +201,8 @@ func (files Files) _transactions(file string) ([]transaction, error) {
 		name := fmt.Sprintf("%s/%d", file, len(result))
 		one, err := readTransaction(name, r)
 		if !one.empty() {
+			one.fileName = file
+			one.lineNo = len(result)
 			result = append(result, one)
 		}
 		if err == io.EOF {