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 {

ledger/file_test.go

@@ -18,13 +18,36 @@ func TestFileTestdata(t *testing.T) {
 			if err != nil {
 				t.Fatal(err)
 			}
-			transactions, err := f.Deltas()
-			if err != nil {
-				t.Fatal(err)
-			}
-			for i := range transactions {
-				t.Logf("%+v", transactions[i].Debug())
-			}
+
+			t.Run("deltas", func(t *testing.T) {
+				deltas, err := f.Deltas()
+				if err != nil {
+					t.Fatal(err)
+				}
+				for i := range deltas {
+					t.Logf("%+v", deltas[i].Debug())
+				}
+			})
+
+			t.Run("balances", func(t *testing.T) {
+				balances, err := f.Balances()
+				if err != nil {
+					t.Fatal(err)
+				}
+				for k, v := range balances {
+					t.Logf("%s: %+v", k, v)
+				}
+			})
+
+			t.Run("balances like", func(t *testing.T) {
+				balances, err := f.Balances(LikeAcc(`AssetAccount:Cash:Fidelity76`))
+				if err != nil {
+					t.Fatal(err)
+				}
+				for k, v := range balances {
+					t.Logf("%s: %+v", k, v)
+				}
+			})
 		})
 	}
 }