Sort the issues by severity in descending order before creating the report

cmd/gas/main.go

@@ -79,6 +79,9 @@ var (
 	// log to file or stderr
 	flagLogfile = flag.String("log", "", "Log messages to file rather than stderr")
 
+	// sort the issues by severity
+	flagSortIssues = flag.Bool("sort", true, "Sort issues by severity")
+
 	logger *log.Logger
 )
 
@@ -231,6 +234,11 @@ func main() {
 		os.Exit(0)
 	}
 
+	// Sort the issue by severity
+	if *flagSortIssues {
+		sort.Slice(issues, func(i, j int) bool { return (issues[i].Severity > issues[j].Severity) })
+	}
+
 	// Create output report
 	if err := saveOutput(*flagOutput, *flagFormat, issues, metrics); err != nil {
 		logger.Fatal(err)