feat: add an "undo" command

This puts a task back in the TODO state.

Some refactoring here lets us reuse the same code for handling both
cmdDo and cmdUndo.

1 files changed, 19 insertions, 0 deletions

diff --git a/main.go b/main.go
index 85bfa26..7838fcb 100644
--- a/main.go
+++ b/main.go
@@ -82,6 +82,25 @@ func main() {
 				},
 			},
 			{
+				Name:    "undo",
+				Aliases: []string{"u"},
+				Usage:   "reset a task on the list",
+				Arguments: []cli.Argument{
+					&cli.IntArg{
+						Name: "taskIndex",
+					},
+				},
+				Action: func(ctx context.Context, cmd *cli.Command) error {
+					taskIndex := cmd.IntArg("taskIndex")
+
+					if taskIndex <= 0 {
+						return fmt.Errorf("invalid 'undo' argument: %d", taskIndex)
+					}
+
+					return ctrl.cmdUndo(taskIndex)
+				},
+			},
+			{
 				Name:    "list",
 				Aliases: []string{"l"},
 				Usage:   "list pending tasks",