dont use slices

cmd/gomtree/cmd/mutate.go

@@ -5,7 +5,6 @@ import (
 	"io"
 	"math"
 	"os"
-	"slices"
 	"strings"
 
 	cli "github.com/urfave/cli/v2"
@@ -76,13 +75,13 @@ func mutateAction(c *cli.Context) error {
 		&tidyVisitor,
 	}
 
-	dropped := []int{}
+	dropped := map[int]bool{}
 	entries := []mtree.Entry{}
 
 skip:
 	for _, entry := range spec.Entries {
-
-		if entry.Parent != nil && slices.Contains(dropped, entry.Parent.Pos) {
+		if entry.Parent != nil {
+			if _, ok := dropped[entry.Parent.Pos]; ok {
 				if entry.Type == mtree.DotDotType {
 					// directory for this .. has been dropped so shall this
 					continue
@@ -91,6 +90,7 @@ skip:
 				// TODO: i am not sure if this is the correct behavior
 				entry.Raw = strings.TrimPrefix(entry.Raw, " ")
 			}
+		}
 
 		for _, visitor := range visitors {
 			drop, err := visitor.Visit(&entry)
@@ -99,7 +99,7 @@ skip:
 			}
 
 			if drop {
-				dropped = append(dropped, entry.Pos)
+				dropped[entry.Pos] = true
 				continue skip
 			}
 		}

go.mod

@@ -1,6 +1,6 @@
 module github.com/vbatts/go-mtree
 
-go 1.18
+go 1.17
 
 require (
 	github.com/davecgh/go-spew v1.1.1