Upgrade to new go errors and some minor fixes and improvements including easier debugging of invalid routes and e.t.c.

Former-commit-id: 5809157b952ccc61a67a9861470774b3a6fee024

view/amber.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"html/template"
 	"io"
+	"os"
 	"path/filepath"
 	"strings"
 	"sync"
@@ -91,6 +92,11 @@ func (s *AmberEngine) Load() error {
 	if err != nil {
 		return err
 	}
+
+	if _, err := os.Stat(dir); os.IsNotExist(err) {
+		return err
+	}
+
 	// change the directory field configuration, load happens after directory has been set, so we will not have any problems here.
 	s.directory = dir
 	return s.loadDirectory()

view/django.go

@@ -209,6 +209,11 @@ func (s *DjangoEngine) Load() error {
 	if err != nil {
 		return err
 	}
+
+	if _, err := os.Stat(dir); os.IsNotExist(err) {
+		return err
+	}
+
 	// change the directory field configuration, load happens after directory has been set, so we will not have any problems here.
 	s.directory = dir
 	return s.loadDirectory()

view/handlebars.go

@@ -111,6 +111,10 @@ func (s *HandlebarsEngine) Load() error {
 	if err != nil {
 		return err
 	}
+	if _, err := os.Stat(dir); os.IsNotExist(err) {
+		return err
+	}
+
 	// change the directory field configuration, load happens after directory has been set, so we will not have any problems here.
 	s.directory = dir
 	return s.loadDirectory()

view/html.go

@@ -226,6 +226,11 @@ func (s *HTMLEngine) Load() error {
 	if err != nil {
 		return err
 	}
+
+	if _, err := os.Stat(dir); os.IsNotExist(err) {
+		return err
+	}
+
 	// change the directory field configuration, load happens after directory has been set, so we will not have any problems here.
 	s.directory = dir
 	return s.loadDirectory()

view/jet.go

@@ -47,6 +47,10 @@ var jetExtensions = [...]string{
 
 // Jet creates and returns a new jet view engine.
 func Jet(directory, extension string) *JetEngine {
+	// if _, err := os.Stat(directory); os.IsNotExist(err) {
+	// 	panic(err)
+	// }
+
 	extOK := false
 	for _, ext := range jetExtensions {
 		if ext == extension {

view/view.go

@@ -1,11 +1,10 @@
 package view
 
 import (
+	"fmt"
 	"io"
 	"path/filepath"
 	"strings"
-
-	"github.com/kataras/iris/core/errors"
 )
 
 // View is responsible to
@@ -37,8 +36,6 @@ func (v *View) Len() int {
 	return len(v.engines)
 }
 
-var errNoViewEngineForExt = errors.New("no view engine found for '%s'")
-
 // ExecuteWriter calls the correct view Engine's ExecuteWriter func
 func (v *View) ExecuteWriter(w io.Writer, filename string, layout string, bindingData interface{}) error {
 	if len(filename) > 2 {
@@ -49,7 +46,7 @@ func (v *View) ExecuteWriter(w io.Writer, filename string, layout string, bindin
 
 	e := v.Find(filename)
 	if e == nil {
-		return errNoViewEngineForExt.Format(filepath.Ext(filename))
+		return fmt.Errorf("no view engine found for '%s'", filepath.Ext(filename))
 	}
 
 	return e.ExecuteWriter(w, filename, layout, bindingData)