mr list: Add --order option

'mr list' lists merge requests in order of the time they were updated, and
doesn't provide an option to list them by numerical order (ie, time they
were created).

Add a --order option to mr list to display the merge requests in

Signed-off-by: Prarit Bhargava <prarit@redhat.com>

cmd/mr_list.go

@@ -21,6 +21,7 @@ var (
 	mrMine         bool
 	assigneeID     *int
 	mrAssignee     string
+	order          string
 )
 
 // listCmd represents the list command
@@ -68,14 +69,16 @@ func mrList(args []string) ([]*gitlab.MergeRequest, error) {
 		assigneeID = &_assigneeID
 	}
 
+	orderBy := gitlab.String(order)
+
 	return lab.MRList(rn, gitlab.ListProjectMergeRequestsOptions{
 		ListOptions: gitlab.ListOptions{
 			PerPage: mrNumRet,
 		},
 		Labels:       mrLabels,
 		State:        &mrState,
 		TargetBranch: &mrTargetBranch,
-		OrderBy:      gitlab.String("updated_at"),
+		OrderBy:      orderBy,
 		AssigneeID:   assigneeID,
 	}, num)
 }
@@ -96,6 +99,7 @@ func init() {
 	listCmd.Flags().BoolVarP(&mrMine, "mine", "m", false, "list only MRs assigned to me")
 	listCmd.Flags().StringVar(
 		&mrAssignee, "assignee", "", "list only MRs assigned to $username")
+	listCmd.Flags().StringVar(&order, "order", "updated_at", "display order, updated_at(default) or created_at")
 
 	mrCmd.AddCommand(listCmd)
 	carapace.Gen(listCmd).FlagCompletion(carapace.ActionMap{