balances can accept delta pushes for FAST

cmd/clitest/main.go

@@ -34,11 +34,10 @@ func main() {
 		sort.Slice(deltas, func(i, j int) bool {
 			return deltas[i].Debug() < deltas[j].Debug()
 		})
-		deltasSoFar := make(ledger.Deltas, 0)
+		balancesSoFar := make(ledger.Balances)
 		for i := range deltas {
-			deltasSoFar = append(deltasSoFar, deltas[i])
+			balancesSoFar.Push(deltas[i])
-			bal, _ := deltasSoFar.Like(ledger.LikeName("^" + deltas[i].Name + "$")).Balances()
+			fmt.Printf("%s (%+v)\n", deltas[i].Debug(), balancesSoFar[deltas[i].Name].Debug())
-			fmt.Printf("%s (%+v)\n", deltas[i].Debug(), bal[deltas[i].Name].Debug())
 		}
 	case "bal":
 		balances, err := deltas.Balances()

ledger/balances.go

@@ -9,6 +9,20 @@ type Balances map[string]Balance
 
 type Balance map[Currency]float64
 
+func (balances Balances) Push(d Delta) {
+	if _, ok := balances[d.Name]; !ok {
+		balances[d.Name] = make(Balance)
+	}
+	balances[d.Name].Push(d)
+}
+
+func (balance Balance) Push(d Delta) {
+	if _, ok := balance[d.Currency]; !ok {
+		balance[d.Currency] = 0
+	}
+	balance[d.Currency] += d.Value
+}
+
 func (balances Balances) Debug() string {
 	result := []string{}
 	for k, v := range balances {