fix description of subcommand more consistent

app_test.go

@@ -1567,7 +1567,8 @@ func TestApp_Run_CommandSubcommandHelpName(t *testing.T) {
 	}
 	cmd := &Command{
 		Name:        "foo",
-		Description: "foo commands",
+		Usage:       "foo commands",
+		Description: "This is a description",
 		Subcommands: []*Command{subCmd},
 	}
 	app.Commands = []*Command{cmd}
@@ -1584,6 +1585,11 @@ func TestApp_Run_CommandSubcommandHelpName(t *testing.T) {
 		t.Errorf("expected %q in output: %q", expected, output)
 	}
 
+	expected = "DESCRIPTION:\n   This is a description\n"
+	if !strings.Contains(output, expected) {
+		t.Errorf("expected %q in output: %q", expected, output)
+	}
+
 	expected = "base foo command [command options] [arguments...]"
 	if !strings.Contains(output, expected) {
 		t.Errorf("expected %q in output: %q", expected, output)

template.go

@@ -56,10 +56,13 @@ OPTIONS:
 // cli.go uses text/template to render templates. You can
 // render custom help text by setting this variable.
 var SubcommandHelpTemplate = `NAME:
-   {{.HelpName}} - {{if .Description}}{{.Description}}{{else}}{{.Usage}}{{end}}
+   {{.HelpName}} - {{.Usage}}
 
 USAGE:
-   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} command{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}
+   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} command{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Description}}
+
+DESCRIPTION:
+   {{.Description}}{{end}}
 
 COMMANDS:{{range .VisibleCategories}}{{if .Name}}
    {{.Name}}:{{range .VisibleCommands}}