halfway to moolah2

ledger/balances.go

@@ -2,6 +2,8 @@ package ledger
 
 import (
 	"fmt"
+	"maps"
+	"regexp"
 	"strings"
 )
 
@@ -9,6 +11,17 @@ type Balances map[string]Balance
 
 type Balance map[Currency]float64
 
+func (balances Balances) Like(pattern string) Balances {
+	result := make(Balances)
+	p := regexp.MustCompile(pattern)
+	for k, v := range balances {
+		if p.MatchString(k) {
+			result[k] = maps.Clone(v)
+		}
+	}
+	return result
+}
+
 func (balances Balances) WithBPIs(bpis BPIs) Balances {
 	return balances.WithBPIsAt(bpis, "9")
 }