feat(cmd): added listcmd and refactored transactions to use TransactionArgs

cmd/del.go

@@ -36,9 +36,17 @@ var delCmd = &cobra.Command{
 
 func del(cmd *cobra.Command, args []string) error {
 	store := &Store{}
-	return store.Transaction(args[0], false, func(tx *badger.Txn, k []byte) error {
+
+	trans := TransactionArgs{
+		key:      args[0],
+		readonly: false,
+		sync:     false,
+		transact: func(tx *badger.Txn, k []byte) error {
 			return tx.Delete(k)
-	})
+		},
+	}
+
+	return store.Transaction(trans)
 }
 
 func init() {

cmd/get.go

@@ -36,17 +36,26 @@ var getCmd = &cobra.Command{
 
 func get(cmd *cobra.Command, args []string) error {
 	store := &Store{}
+
 	var v []byte
-	if err := store.Transaction(args[0], true, func(tx *badger.Txn, k []byte) error {
+	trans := TransactionArgs{
+		key:      args[0],
+		readonly: true,
+		sync:     false,
+		transact: func(tx *badger.Txn, k []byte) error {
 			item, err := tx.Get(k)
 			if err != nil {
 				return err
 			}
 			v, err = item.ValueCopy(nil)
 			return err
-	}); err != nil {
+		},
+	}
+
+	if err := store.Transaction(trans); err != nil {
 		return err
 	}
+
 	store.Print("%s", v)
 	return nil
 }

cmd/list.go

@@ -0,0 +1,81 @@
+/*
+Copyright © 2025 Lewis Wynne <lew@ily.rs>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+package cmd
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/dgraph-io/badger/v4"
+	"github.com/spf13/cobra"
+)
+
+// listCmd represents the set command
+var listCmd = &cobra.Command{
+	Use:   "list [@DB]",
+	Short: "List the contents of a db.",
+	Args:  cobra.MaximumNArgs(1),
+	RunE:  list,
+}
+
+func list(cmd *cobra.Command, args []string) error {
+	store := &Store{}
+	var pf string
+	var err error
+	pf, err = strconv.Unquote(fmt.Sprintf(`"%%s%s%%s\n"`, "\t\t"))
+	if err != nil {
+		return err
+	}
+
+	if len(args) == 0 {
+		args = append(args, "@default")
+	}
+
+	trans := TransactionArgs{
+		key:      args[0],
+		readonly: true,
+		sync:     true,
+		transact: func(tx *badger.Txn, k []byte) error {
+			opts := badger.DefaultIteratorOptions
+			opts.PrefetchSize = 10
+			it := tx.NewIterator(opts)
+			defer it.Close()
+			for it.Rewind(); it.Valid(); it.Next() {
+				item := it.Item()
+				k := item.Key()
+				if err := item.Value(func(v []byte) error {
+					store.Print(pf, k, v)
+					return nil
+				}); err != nil {
+					return err
+				}
+			}
+			return nil
+		},
+	}
+
+	return store.Transaction(trans)
+}
+
+func init() {
+	rootCmd.AddCommand(listCmd)
+}

cmd/set.go

@@ -38,22 +38,31 @@ var setCmd = &cobra.Command{
 
 func set(cmd *cobra.Command, args []string) error {
 	store := &Store{}
-	if len(args) == 2 {
-		return store.Transaction(args[0], false, func(tx *badger.Txn, k []byte) error {
-			return tx.Set(k, []byte(args[1]))
-		})
-	}
 
-	bts, err := io.ReadAll(cmd.InOrStdin())
+	var value []byte
+	if len(args) == 2 {
+		value = []byte(args[1])
+	} else {
+		bytes, err := io.ReadAll(cmd.InOrStdin())
 		if err != nil {
 			return err
 		}
+		value = bytes
+	}
 
-	return store.Transaction(args[0], false, func(tx *badger.Txn, k []byte) error {
+	trans := TransactionArgs{
-		return tx.Set(k, bts)
+		key:      args[0],
-	})
+		readonly: false,
+		sync:     false,
+		transact: func(tx *badger.Txn, k []byte) error {
+			return tx.Set(k, value)
+		},
+	}
+
+	return store.Transaction(trans)
 }
 
 func init() {
 	rootCmd.AddCommand(setCmd)
 }
+

cmd/shared.go

@@ -90,18 +90,34 @@ func (s *Store) Print(pf string, vs ...[]byte) {
 	}
 }
 
-func (s *Store) Transaction(key string, readonly bool, fn func(tx *badger.Txn, key []byte) error) error {
+type TransactionArgs struct {
-	k, dbName, err := s.parse(key)
+	key      string
+	readonly bool
+	sync     bool
+	transact func(tx *badger.Txn, key []byte) error
+}
+
+func (s *Store) Transaction(args TransactionArgs) error {
+	k, dbName, err := s.parse(args.key)
 	if err != nil {
 		return err
 	}
+
 	db, err := s.open(dbName)
 	if err != nil {
 		return err
 	}
 	defer db.Close()
-	tx := db.NewTransaction(!readonly)
+
-	if err := fn(tx, k); err != nil {
+	if args.sync {
+		err = db.Sync()
+		if err != nil {
+			return err
+		}
+	}
+
+	tx := db.NewTransaction(!args.readonly)
+	if err := args.transact(tx, k); err != nil {
 		tx.Discard()
 		return err
 	}