From 5b2eab10f015382fc6e919fd5a8f948693a09292 Mon Sep 17 00:00:00 2001
From: Nikita Tokarchuk <nikita@tokarch.uk>
Date: Fri, 3 Dec 2021 02:26:03 +0100
Subject: [PATCH] Parse compiled-in go templates on app start

---
 frontend/main.go                |  2 ++
 frontend/templates/templates.go | 51 +++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 frontend/templates/templates.go

diff --git a/frontend/main.go b/frontend/main.go
index 757f509..9346ef8 100644
--- a/frontend/main.go
+++ b/frontend/main.go
@@ -9,6 +9,8 @@ import (
 	"github.com/valyala/fasthttp"
 
 	"code.tokarch.uk/mainnika/nikita-tokarch-uk/frontend/config"
+
+	_ "code.tokarch.uk/mainnika/nikita-tokarch-uk/frontend/templates"
 )
 
 var Version = "nightly"
diff --git a/frontend/templates/templates.go b/frontend/templates/templates.go
new file mode 100644
index 0000000..84cdb8d
--- /dev/null
+++ b/frontend/templates/templates.go
@@ -0,0 +1,51 @@
+package templates
+
+import (
+	"bytes"
+	"embed"
+	"html/template"
+	"io/fs"
+
+	"github.com/sirupsen/logrus"
+)
+
+// Static go-templates source
+var content embed.FS
+
+// List of compiled go-templates
+var Templates *template.Template
+
+// Load embeded templates
+func init() {
+
+	Templates = template.New("")
+
+	tmplNames, err := fs.Glob(content, "*.go.tmpl")
+	if err != nil {
+		panic(err)
+	}
+
+	buf := bytes.NewBuffer(nil)
+
+	for _, name := range tmplNames {
+
+		buf.Reset()
+
+		tmplContent, err := content.Open(name)
+		if err != nil {
+			panic(err)
+		}
+		size, err := buf.ReadFrom(tmplContent)
+		if err != nil {
+			panic(err)
+		}
+		tmpl, err := Templates.New(name).Parse(buf.String())
+		if err != nil {
+			panic(err)
+		}
+
+		logrus.Debugf("Found template: %s, size:%d", tmpl.Name(), size)
+	}
+
+	logrus.Debugf("Templates loading complete%s", Templates.DefinedTemplates())
+}