Add shared report format flag

parser.go

@@ -24,6 +24,18 @@ func reduceReportingOccurrences(result commandmeta.Result) commandmeta.Result {
 		if !commandmeta.IsReportingFlag(occurrence.Name) {
 			continue
 		}
+		if occurrence.Name == "format" {
+			switch Format(occurrence.RawValue) {
+			case FormatText, FormatYAML, FormatJSON:
+				selection.Format = occurrence.RawValue
+			default:
+				result.FlagOccurrences = result.FlagOccurrences[:index+1]
+				result.Reporting = selection
+				result.Failure = &commandmeta.Failure{Message: fmt.Sprintf("invalid format %q for %s (expected text, yaml, or json)", occurrence.RawValue, occurrence.Spelling), Usage: true}
+				return result
+			}
+			continue
+		}
 		enabled, err := strconv.ParseBool(occurrence.RawValue)
 		if err != nil {
 			result.FlagOccurrences = result.FlagOccurrences[:index+1]