Add shared report format flag

internal/commandmeta/metadata.go

@@ -79,6 +79,7 @@ var reportingFlags = [...]Flag{
 	{Name: "verbose", Usage: "show warning and informational messages", Default: "false", Boolean: true},
 	{Name: "debug", Usage: "show debugging messages", Default: "false", Boolean: true},
 	{Name: "progress", Usage: "show progress messages", Default: "false", Boolean: true},
+	{Name: "format", Usage: "report format: text, yaml, or json", Completion: CompletionHint{Kind: CompletionChoices, Choices: []CompletionChoice{{Value: "text"}, {Value: "yaml"}, {Value: "json"}}}},
 }
 
 // BooleanCompletion returns the ordinary explicit boolean suggestions.
@@ -95,7 +96,11 @@ func HelpFlag() Flag {
 func ReportingFlags() []Flag {
 	flags := append([]Flag(nil), reportingFlags[:]...)
 	for index := range flags {
-		flags[index].Completion = BooleanCompletion()
+		if flags[index].Boolean {
+			flags[index].Completion = BooleanCompletion()
+		} else {
+			flags[index].Completion.Choices = append([]CompletionChoice(nil), flags[index].Completion.Choices...)
+		}
 	}
 	return flags
 }
@@ -160,6 +165,7 @@ type ReportingSelection struct {
 	Mode        ReportingMode
 	Progress    bool
 	ProgressSet bool
+	Format      string
 }
 
 // Result contains the selected command and raw input collected by the adapter.