balances.NotLike

src/ledger/balances.go

@@ -11,6 +11,17 @@ type Balances map[string]Balance
 
 type Balance map[Currency]float64
 
+func (balances Balances) NotLike(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) Like(pattern string) Balances {
 	result := make(Balances)
 	p := regexp.MustCompile(pattern)

src/ledger/balances_test.go

@@ -61,6 +61,11 @@ func TestBalances(t *testing.T) {
 		if len(got) != 1 || got["ab"][USD] != 1.2 {
 			t.Error(got)
 		}
+
+		got = was.NotLike(`^ab$`)
+		if len(got) != 1 || got["a"][USD] != 0.1 {
+			t.Error(got)
+		}
 	})
 
 	t.Run("group", func(t *testing.T) {

src/ledger/like.go

@@ -8,12 +8,21 @@ type Like func(Delta) bool
 
 type Likes []Like
 
-func LikeTransaction(delta Delta) Like {
+func LikeTransactions(deltas ...Delta) Like {
 	return func(d Delta) bool {
-		return d.Transaction == delta.Transaction
+		for i := range deltas {
+			if deltas[i].Transaction == d.Transaction {
+				return true
+			}
+		}
+		return false
 	}
 }
 
+func LikeTransaction(delta Delta) Like {
+	return LikeTransactions(delta)
+}
+
 func LikeBefore(date string) Like {
 	return func(d Delta) bool {
 		return date >= d.Date