feat(cli): add apply subcommand

internal/cli/rollback.go

@@ -0,0 +1,37 @@
+package cli
+
+import (
+	"strconv"
+
+	"github.com/spf13/cobra"
+
+	"github.com/lukaszraczylo/harness-sync/internal/gitx"
+)
+
+// NewRollback returns the `rollback` subcommand. It reverts the last N apply
+// commits in the canonical repo by calling `git revert` over a range.
+func NewRollback() *cobra.Command {
+	var root string
+	cmd := &cobra.Command{
+		Use:   "rollback [n]",
+		Short: "Revert the last N apply commits in the canonical repo",
+		Args:  cobra.MaximumNArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			r, err := resolveRoot(root)
+			if err != nil {
+				return err
+			}
+			n := 1
+			if len(args) == 1 {
+				v, err := strconv.Atoi(args[0])
+				if err != nil || v < 1 {
+					return cmd.Help()
+				}
+				n = v
+			}
+			return gitx.New(r).Revert(n)
+		},
+	}
+	cmd.Flags().StringVar(&root, "root", "", "canonical root")
+	return cmd
+}