Make parsed templates a global variable

This allows to parse the templates during startup and use them in each
HTTP handler without explicit passing to these handlers.

1 files changed, 3 insertions, 2 deletions

diff --git a/main.go b/main.go
index 511b434..80247e8 100644
--- a/main.go
+++ b/main.go
@@ -11,6 +11,7 @@ import (
 
 //go:embed simple.css/simple.css templates/index.html
 var static embed.FS
+var templates *template.Template
 
 func main() {
 	configPath := parseFlags()
@@ -37,13 +38,13 @@ func parseFlags() string {
 
 // index() returns a HTTP handler for the index page.
 func index(devices DevicesConfig) func(http.ResponseWriter, *http.Request) {
-	tmpl, err := template.ParseFS(static, "templates/index.html")
+	templates, err := template.ParseFS(static, "templates/index.html")
 	if err != nil {
 		log.Fatal(err)
 	}
 
 	return func(w http.ResponseWriter, r *http.Request) {
-		err = tmpl.Execute(w, devices)
+		err = templates.Execute(w, devices)
 		if err != nil {
 			http.Error(w, fmt.Sprint(err), http.StatusInternalServerError)
 			return