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_1/main.go

@@ -1,24 +1,20 @@
-// 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"
+import (
+	"html/template"
 
-type Person struct {
-	Name   string
-	Age    int
-	Emails []string
-	Jobs   []*Job
-}
-
-type Job struct {
-	Employer string
-	Role     string
-}
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
 
 	tmpl := iris.Pug("./templates", ".pug")
+	tmpl.Reload(true)                                            // reload templates on each request (development mode)
+	tmpl.AddFunc("bold", func(s string) (template.HTML, error) { // add your template func here.
+		return template.HTML("<b>" + s + "</b>"), nil
+	})
+
 	app.RegisterView(tmpl)
 
 	app.Get("/", index)
@@ -28,15 +24,5 @@ func main() {
 }
 
 func index(ctx iris.Context) {
-	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)
+	ctx.View("index.pug")
 }

_examples/view/template_pug_1/templates/footer.pug

@@ -0,0 +1,2 @@
+#footer
+  p Copyright (c) foobar

_examples/view/template_pug_1/templates/header.pug

@@ -0,0 +1,4 @@
+head
+  title My Site
+  <!-- script(src='/javascripts/jquery.js')
+  script(src='/javascripts/app.js') -->

_examples/view/template_pug_1/templates/index.pug

@@ -1,20 +1,7 @@
 doctype html
-html(lang="en")
-	head
-		meta(charset="utf-8")
-		title Title
-	body
-		p ads
-		ul
-			li The name is {{.Name}}.
-			li The age is {{.Age}}.
-
-		each _,_ in .Emails
-			div An email is {{.}}
-
-		| {{ with .Jobs }}
-			each _,_ in .
-				div
-				 An employer is {{.Employer}}
-				 and the role is {{.Role}}
-		| {{ end }}
+html
+  include header.pug
+  body
+    h1 My Site
+    p {{ bold "Welcome to my super lame site."}}
+    include footer.pug