From bab37c1ef8220ab7fb92ea22b98e5941989fa721 Mon Sep 17 00:00:00 2001
From: Jordan Krage <jmank88@gmail.com>
Date: Thu, 21 Aug 2025 11:00:41 -0500
Subject: [PATCH] don't print outline unless used

---
 main.go                   |  6 ++++--
 testdata/no-outline.txtar | 16 ++++++++++++++++
 2 files changed, 20 insertions(+), 2 deletions(-)
 create mode 100644 testdata/no-outline.txtar

diff --git a/main.go b/main.go
index 16f5e2d..be49512 100644
--- a/main.go
+++ b/main.go
@@ -76,8 +76,10 @@ func Main() int {
 		fmt.Printf("\tclick %[1]s-repo href \"https://%s%[1]s\"\n", repo, *prefix)
 	}
 
-	fmt.Println("\n\tclassDef outline stroke-dasharray:6,fill:none;")
-	fmt.Printf("\tclass %s outline\n", strings.Join(subgraphs, ","))
+	if len(subgraphs) > 0 {
+		fmt.Println("\n\tclassDef outline stroke-dasharray:6,fill:none;")
+		fmt.Printf("\tclass %s outline\n", strings.Join(subgraphs, ","))
+	}
 	return 0
 }
 
diff --git a/testdata/no-outline.txtar b/testdata/no-outline.txtar
new file mode 100644
index 0000000..731e2a9
--- /dev/null
+++ b/testdata/no-outline.txtar
@@ -0,0 +1,16 @@
+stdin go-mod-graph.txt
+exec modgraph -prefix github.com/example/
+cmp stdout go.md
+
+-- go-mod-graph.txt --
+github.com/example/foo github.com/example/bar
+github.com/example/bar github.com/example/baz
+github.com/example/foo github.com/example/baz
+
+-- go.md --
+	bar --> baz
+	click bar href "https://github.com/example/bar"
+	baz
+	click baz href "https://github.com/example/baz"
+	foo --> bar
+	click foo href "https://github.com/example/foo"