feat: add replace subcommand with multi-pattern support

cmd/undo.go

@@ -0,0 +1,52 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+
+	"github.com/rogeecn/renamer/internal/history"
+)
+
+func newUndoCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "undo",
+		Short: "Undo the most recent rename or replace batch",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			workingDir, err := resolveWorkingDir(cmd)
+			if err != nil {
+				return err
+			}
+
+			entry, err := history.Undo(workingDir)
+			if err != nil {
+				return err
+			}
+
+			fmt.Fprintf(cmd.OutOrStdout(), "Undo applied: %d operations reversed\n", len(entry.Operations))
+			return nil
+		},
+	}
+
+	return cmd
+}
+
+func resolveWorkingDir(cmd *cobra.Command) (string, error) {
+	if flag := cmd.Flags().Lookup("path"); flag != nil {
+		if value := flag.Value.String(); value != "" {
+			return filepath.Abs(value)
+		}
+	}
+	if flag := cmd.InheritedFlags().Lookup("path"); flag != nil {
+		if value := flag.Value.String(); value != "" {
+			return filepath.Abs(value)
+		}
+	}
+	return os.Getwd()
+}
+
+func init() {
+	rootCmd.AddCommand(newUndoCommand())
+}