From 8da9de3177c08478f2532028d21edc5ccef4dda0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pedro=20P=C3=A9rez?= <hola@pedroperez.dev>
Date: Sun, 24 Nov 2024 23:01:51 +0100
Subject: [PATCH] add defaultIfEmpty function for template default values

---
 template.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/template.go b/template.go
index 4314a11..5ae5c1e 100644
--- a/template.go
+++ b/template.go
@@ -56,10 +56,19 @@ func (re *Render) apply(opts ...RenderOptions) *Render {
 	return re
 }
 
+func defaultIfEmpty(fallback, value string) string {
+	if strings.TrimSpace(value) == "" {
+		return fallback
+	}
+	return value
+}
+
 func (re *Render) Template(w http.ResponseWriter, tmpl string, td *TemplateData) error {
 	var tc templateCache
 	var err error
 
+	re.Functions["default"] = defaultIfEmpty
+
 	if td == nil {
 		td = &TemplateData{}
 	}