Add --no-headers flag to tkn clustertriggerbinding list command

docs/cmd/tkn_clustertriggerbinding_list.md

@@ -30,6 +30,7 @@ or
 ```
       --allow-missing-template-keys   If true, ignore any errors in templates when a field or map key is missing in the template. Only applies to golang and jsonpath output formats. (default true)
   -h, --help                          help for list
+      --no-headers                    do not print column headers with output (default print column headers with output)
   -o, --output string                 Output format. One of: json|yaml|name|go-template|go-template-file|template|templatefile|jsonpath|jsonpath-file.
       --template string               Template string or path to template file to use when -o=go-template, -o=go-template-file. The template format is golang templates [http://golang.org/pkg/text/template/#pkg-overview].
 ```

docs/man/man1/tkn-clustertriggerbinding-list.1

@@ -27,6 +27,10 @@ Lists ClusterTriggerBindings in a namespace
 \fB\-h\fP, \fB\-\-help\fP[=false]
     help for list
 
+.PP
+\fB\-\-no\-headers\fP[=false]
+    do not print column headers with output (default print column headers with output)
+
 .PP
 \fB\-o\fP, \fB\-\-output\fP=""
     Output format. One of: json|yaml|name|go\-template|go\-template\-file|template|templatefile|jsonpath|jsonpath\-file.

pkg/cmd/clustertriggerbinding/list.go

@@ -35,7 +35,12 @@ const (
 	emptyMsg = "No ClusterTriggerBindings found"
 )
 
+type listOptions struct {
+	NoHeaders bool
+}
+
 func listCommand(p cli.Params) *cobra.Command {
+	opts := &listOptions{}
 	f := cliopts.NewPrintFlags("list")
 
 	eg := `List all ClusterTriggerBindings:
@@ -89,7 +94,7 @@ or
 				return printer.PrintObject(stream.Out, tbs, f)
 			}
 
-			if err = printFormatted(stream, tbs, p); err != nil {
+			if err = printFormatted(stream, tbs, p, opts.NoHeaders); err != nil {
 				return fmt.Errorf("failed to print ClusterTriggerBindings: %v", err)
 			}
 			return nil
@@ -98,7 +103,7 @@ or
 	}
 
 	f.AddFlags(c)
-
+	c.Flags().BoolVar(&opts.NoHeaders, "no-headers", opts.NoHeaders, "do not print column headers with output (default print column headers with output)")
 	return c
 }
 
@@ -119,14 +124,16 @@ func list(client versioned.Interface, namespace string) (*v1alpha1.ClusterTrigge
 	return tbs, nil
 }
 
-func printFormatted(s *cli.Stream, tbs *v1alpha1.ClusterTriggerBindingList, p cli.Params) error {
+func printFormatted(s *cli.Stream, tbs *v1alpha1.ClusterTriggerBindingList, p cli.Params, noHeaders bool) error {
 	if len(tbs.Items) == 0 {
 		fmt.Fprintln(s.Err, emptyMsg)
 		return nil
 	}
 
 	w := tabwriter.NewWriter(s.Out, 0, 5, 3, ' ', tabwriter.TabIndent)
-	fmt.Fprintln(w, "NAME\tAGE")
+	if !noHeaders {
+		fmt.Fprintln(w, "NAME\tAGE")
+	}
 	for _, tb := range tbs.Items {
 		fmt.Fprintf(w, "%s\t%s\n",
 			tb.Name,

pkg/cmd/clustertriggerbinding/list_test.go

@@ -70,6 +70,12 @@ func TestListClusterTriggerBinding(t *testing.T) {
 			args:      []string{"list", "-o", "jsonpath={range .items[*]}{.metadata.name}{\"\\n\"}{end}"},
 			wantError: false,
 		},
+		{
+			name:      "List ClusterTriggerBindings without headers",
+			command:   command(t, ctbs, now),
+			args:      []string{"list", "--no-headers"},
+			wantError: false,
+		},
 	}
 
 	for _, td := range tests {

pkg/cmd/clustertriggerbinding/testdata/TestListClusterTriggerBinding-List_ClusterTriggerBindings_without_headers.golden

@@ -0,0 +1,4 @@
+ctb1   2 minutes ago
+ctb2   30 seconds ago
+ctb3   1 week ago
+ctb4   ---