kepctl query: support --stage none

I wanted to find KEPs for my sig that didn't yet have a stage so I could
clean them up, which is why I now know that way cobra implements
StringSliceVar is slightly non-intuitive:

- `--stage ""` becomes `[]string{}`
- `--stage "",""` becomes `[]string{"",""}`

It seemed nicer to support `--stage none` as a sentinel value

Author: spiffxp

pkg/repo/query.go

@@ -72,6 +72,13 @@ func (r *Repo) PrepareQueryOpts(opts *QueryOpts) error {
 		// if no SIGs are passed, list KEPs from all SIGs
 		opts.Groups = groups
 	}
+
+	for i, v := range opts.Stage {
+		if v == "none" {
+			opts.Stage[i] = ""
+		}
+	}
+
 	return nil
 }
 

pkg/repo/query_test.go

@@ -162,6 +162,15 @@ func TestQuery(t *testing.T) {
 					"1-the-bare-minimum",
 				},
 			},
+			{
+				name: "none",
+				queryOpts: repo.QueryOpts{
+					Stage: []string{"none"},
+				},
+				kepNames: []string{
+					"1-the-bare-minimum",
+				},
+			},
 			{
 				name: "alpha",
 				queryOpts: repo.QueryOpts{