From 025a2d172ebfe36bc0da32f5712dd250916c73f1 Mon Sep 17 00:00:00 2001
From: phil9 <telephil9@gmail.com>
Date: Thu, 9 May 2024 17:18:45 +0000
Subject: [PATCH] vdiff: exit if diff is empty

	currently vdiff will display an empty window if there is no diff.
	Print a message and exit early instead.
---
 sys/src/cmd/vdiff.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/src/cmd/vdiff.c b/sys/src/cmd/vdiff.c
index c8e5a8c4e..d48f1741f 100644
--- a/sys/src/cmd/vdiff.c
+++ b/sys/src/cmd/vdiff.c
@@ -613,7 +613,7 @@ threadmain(int argc, char *argv[])
 	}ARGEND;
 
 	parse(0);
-	if(nblocks==0){
+	if(nblocks==1 && blocks[0]->nlines==0){
 		fprint(2, "no diff\n");
 		exits(nil);
 	}