From 683dfe0fb0b022be22de6b075bb9c450ef030521 Mon Sep 17 00:00:00 2001
From: Vicent Marti <tanoku@gmail.com>
Date: Thu, 25 Jan 2018 14:03:06 +0100
Subject: [PATCH] compiler: Do not output empty grammars

---
 tools/grammars/compiler/converter.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/grammars/compiler/converter.go b/tools/grammars/compiler/converter.go
index aeadaefa..b0145b98 100644
--- a/tools/grammars/compiler/converter.go
+++ b/tools/grammars/compiler/converter.go
@@ -145,7 +145,10 @@ func (conv *Converter) ConvertGrammars(update bool) error {
 		repo.FixRules(knownScopes)
 
 		if update {
-			conv.grammars[source] = repo.Scopes()
+			scopes := repo.Scopes()
+			if len(scopes) > 0 {
+				conv.grammars[source] = scopes
+			}
 		} else {
 			expected := conv.grammars[source]
 			repo.CompareScopes(expected)