Full support of the http.FileSystem on all view engines as requested at #1575

Also, the HandleDir accepts both string and http.FileSystem (interface{}) (like the view's fs)

_examples/view/template_pug_0/main.go

@@ -1,16 +1,24 @@
+// Package main shows an example of pug actions based on https://github.com/Joker/jade/tree/master/example/actions
 package main
 
 import "github.com/kataras/iris/v12"
 
+type Person struct {
+	Name   string
+	Age    int
+	Emails []string
+	Jobs   []*Job
+}
+
+type Job struct {
+	Employer string
+	Role     string
+}
+
 func main() {
 	app := iris.New()
 
 	tmpl := iris.Pug("./templates", ".pug")
-	tmpl.Reload(true)                             // reload templates on each request (development mode)
-	tmpl.AddFunc("greet", func(s string) string { // add your template func here.
-		return "Greetings " + s + "!"
-	})
-
 	app.RegisterView(tmpl)
 
 	app.Get("/", index)
@@ -20,9 +28,15 @@ func main() {
 }
 
 func index(ctx iris.Context) {
-	ctx.ViewData("pageTitle", "My Index Page")
-	ctx.ViewData("youAreUsingJade", true)
-	// Q: why need extension .pug?
-	// A: Because you can register more than one view engine per Iris application.
-	ctx.View("index.pug")
+	job1 := Job{Employer: "Monash B", Role: "Honorary"}
+	job2 := Job{Employer: "Box Hill", Role: "Head of HE"}
+
+	person := Person{
+		Name:   "jan",
+		Age:    50,
+		Emails: []string{"jan@newmarch.name", "jan.newmarch@gmail.com"},
+		Jobs:   []*Job{&job1, &job2},
+	}
+
+	ctx.View("index.pug", person)
 }