feat: better error handling for sys kill signals

cmd/cmds_add.go

@@ -15,13 +15,18 @@ var cmdsAddCmd = &cobra.Command{
 	Short: "Add a command to run on a specific event",
 	Long:  `Add a command to run on a specific event.`,
 	Args:  cobra.MinimumNArgs(2),
-	Run: python(func(_ *cobra.Command, args []string, d pythonData) {
+	RunE: python(func(_ *cobra.Command, args []string, d *pythonData) error {
 		s, err := d.store.Settings.Get()
-		checkErr(err)
+		if err != nil {
+			return err
+		}
 		command := strings.Join(args[1:], " ")
 		s.Commands[args[0]] = append(s.Commands[args[0]], command)
 		err = d.store.Settings.Save(s)
-		checkErr(err)
+		if err != nil {
+			return err
+		}
 		printEvents(s.Commands)
+		return nil
 	}, pythonConfig{}),
 }