output: Prevent setting Name directly in new output formats

Name is derived from the map key.

Closes #11947

hugolib/site_output_test.go

@@ -330,8 +330,7 @@ func TestGetOutputFormatRel(t *testing.T) {
 	b := newTestSitesBuilder(t).
 		WithSimpleConfigFileAndSettings(map[string]any{
 			"outputFormats": map[string]any{
-				"humansTXT": map[string]any{
-					"name":        "HUMANS",
+				"HUMANS": map[string]any{
 					"mediaType":   "text/plain",
 					"baseName":    "humans",
 					"isPlainText": true,

output/config.go

@@ -65,10 +65,10 @@ func DecodeConfig(mediaTypes media.Types, in any) (*config.ConfigNamespace[map[s
 				}
 
 				newOutFormat := defaultOutputFormat
-				newOutFormat.Name = k
 				if err := decode(mediaTypes, v, &newOutFormat); err != nil {
 					return f, nil, err
 				}
+				newOutFormat.Name = k
 
 				f = append(f, newOutFormat)
 

output/outputFormat.go

@@ -29,7 +29,7 @@ type Format struct {
 	// The Name is used as an identifier. Internal output formats (i.e. html and rss)
 	// can be overridden by providing a new definition for those types.
 	// <docsmeta>{ "identifiers": ["html", "rss"] }</docsmeta>
-	Name string `json:"name"`
+	Name string `json:"-"`
 
 	MediaType media.Type `json:"-"`