WERKS EZ PZ

ledger/file.go

@@ -12,6 +12,26 @@ func NewFile(p string) (File, error) {
 	return f, err
 }
 
+func (file File) Balances(like ...Like) (map[string]map[Currency]float64, error) {
+	deltas, err := file.Deltas(like...)
+	if err != nil {
+		return nil, err
+	}
+
+	result := make(map[string]map[Currency]float64)
+	for _, delta := range deltas {
+		if _, ok := result[delta.Account]; !ok {
+			result[delta.Account] = make(map[Currency]float64)
+		}
+		if _, ok := result[delta.Account][delta.Currency]; !ok {
+			result[delta.Account][delta.Currency] = 0
+		}
+		result[delta.Account][delta.Currency] += delta.Value
+	}
+
+	return result, nil
+}
+
 func (file File) Deltas(like ...Like) ([]Delta, error) {
 	transactions, err := file.transactions()
 	if err != nil {