templates: Share fragments

internal/dis/component/control/static/templates.go

@@ -0,0 +1,30 @@
+package static
+
+import (
+	"embed"
+	"encoding/json"
+	"html/template"
+)
+
+//go:embed "templates/*.html"
+var templates embed.FS
+
+var (
+	shared *template.Template = template.Must(template.ParseFS(templates, "templates/*.html"))
+)
+
+// NewSharedTemplate creates a new template with the given name.
+// It will be able to make use of shared templates as well as functions.
+func NewSharedTemplate(name string) *template.Template {
+	new := template.New(name)
+	new.Funcs(template.FuncMap{
+		"json": func(data any) (string, error) {
+			bytes, err := json.Marshal(data)
+			return string(bytes), err
+		},
+	})
+	for _, template := range shared.Templates() {
+		new.AddParseTree(template.Tree.Name, template.Tree.Copy())
+	}
+	return new
+}