Ability to register a view engine per group of routes or for the current a chain of handlers

Example at: https://github.com/kataras/iris/tree/master/_examples/view/context-view-engine

view/ace.go

@@ -21,10 +21,11 @@ func Ace(directory, extension string) *HTMLEngine {
 	once := new(sync.Once)
 	s.middleware = func(name string, text []byte) (contents string, err error) {
 		once.Do(func() { // on first template parse, all funcs are given.
-			for k, v := range s.funcs {
+			for k, v := range emptyFuncs {
 				funcs[k] = v
 			}
-			for k, v := range emptyFuncs {
+
+			for k, v := range s.funcs {
 				funcs[k] = v
 			}
 		})

view/engine.go

@@ -1,31 +0,0 @@
-package view
-
-import (
-	"io"
-)
-
-// NoLayout disables the configuration's layout for a specific execution.
-const NoLayout = "iris.nolayout"
-
-// returns empty if it's no layout or empty layout and empty configuration's layout.
-func getLayout(layout string, globalLayout string) string {
-	if layout == NoLayout {
-		return ""
-	}
-
-	if layout == "" && globalLayout != "" {
-		return globalLayout
-	}
-
-	return layout
-}
-
-// Engine is the interface which all view engines should be implemented in order to be registered inside iris.
-type Engine interface {
-	// Load should load the templates from a physical system directory or by an embedded one (assets/go-bindata).
-	Load() error
-	// ExecuteWriter should execute a template by its filename with an optional layout and bindingData.
-	ExecuteWriter(w io.Writer, filename string, layout string, bindingData interface{}) error
-	// Ext should return the final file extension which this view engine is responsible to render.
-	Ext() string
-}

view/funcs.go

@@ -1,10 +0,0 @@
-package view
-
-// EngineFuncer is an addition of a view engine,
-// if a view engine implements that interface
-// then iris can add some closed-relative iris functions
-// like {{ urlpath }} and {{ urlpath }}.
-type EngineFuncer interface {
-	// AddFunc should adds a function to the template's function map.
-	AddFunc(funcName string, funcBody interface{})
-}

view/view.go

@@ -5,6 +5,18 @@ import (
 	"io"
 	"path/filepath"
 	"strings"
+
+	"github.com/kataras/iris/v12/context"
+)
+
+type (
+	// Engine is the interface for a compatible Iris view engine.
+	// It's an alias of context.ViewEngine.
+	Engine = context.ViewEngine
+	// EngineFuncer is the interface for a compatible Iris view engine
+	// which accepts builtin framework functions such as url, urlpath and tr.
+	// It's an alias of context.ViewEngineFuncer.
+	EngineFuncer = context.ViewEngineFuncer
 )
 
 // View is responsible to
@@ -73,3 +85,19 @@ func (v *View) Load() error {
 	}
 	return nil
 }
+
+// NoLayout disables the configuration's layout for a specific execution.
+const NoLayout = "iris.nolayout"
+
+// returns empty if it's no layout or empty layout and empty configuration's layout.
+func getLayout(layout string, globalLayout string) string {
+	if layout == NoLayout {
+		return ""
+	}
+
+	if layout == "" && globalLayout != "" {
+		return globalLayout
+	}
+
+	return layout
+}