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

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)
+}