From 71e9a15ccfcd654722fc4290a8dc4493b94113d8 Mon Sep 17 00:00:00 2001
From: Chris Mayo <aklhfex@gmail.com>
Date: Wed, 5 Aug 2020 20:05:49 +0100
Subject: [PATCH] Don't copy graphviz.css when building man pages

_static/graphviz.css is being created alongside the man pages.
---
 sphinx/ext/graphviz.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sphinx/ext/graphviz.py b/sphinx/ext/graphviz.py
index 4a8dd0a4d..d97a7505e 100644
--- a/sphinx/ext/graphviz.py
+++ b/sphinx/ext/graphviz.py
@@ -385,7 +385,7 @@ def man_visit_graphviz(self: ManualPageTranslator, node: graphviz) -> None:
 
 
 def on_build_finished(app: Sphinx, exc: Exception) -> None:
-    if exc is None:
+    if exc is None and app.builder.format == 'html':
         src = path.join(sphinx.package_dir, 'templates', 'graphviz', 'graphviz.css')
         dst = path.join(app.outdir, '_static')
         copy_asset(src, dst)