dis: Rework styling and build procedure

pkg/resources/template.go

@@ -0,0 +1,29 @@
+package resources
+
+import (
+	"html/template"
+	"strings"
+)
+
+// MustParse parses a new "html/template" from the given value, and registers the given functions with it.
+// When something goes wrong, calls panic()
+func (resources *Resources) MustParse(value string) *template.Template {
+	return template.Must(resources.RegisterFuncs(template.New("")).Parse(value))
+}
+
+// RegisterFuncs registers two new template functions with t.
+// "JS" and "CSS" that return the appropriate resources to insert into the template.
+func (resources *Resources) RegisterFuncs(t *template.Template) *template.Template {
+	var builder strings.Builder
+	resources.WriteCSS(&builder)
+	css := template.HTML(builder.String())
+
+	builder.Reset()
+	resources.WriteJS(&builder)
+	js := template.HTML(builder.String())
+
+	return t.Funcs(template.FuncMap{
+		"JS":  func() template.HTML { return js },
+		"CSS": func() template.HTML { return css },
+	})
+}