Fix Hugo error

Former-commit-id: 22a3e0ab7462efcf920a14a8f45da27c0fd683dd [formerly c393472665da880feee876ca3c24e474660c1f44] [formerly b83bf6b70a23c6522a9896ef47819f0442c5d2c8 [formerly c0b60d5928]]
Former-commit-id: d3b03bb09b509b29781c0f585b2f44401f1f37cf [formerly e40c32c1eb119d2ccfa681b62310642534b71b79]
Former-commit-id: 1e643026d4fde9e223dbb29c108acfb530963624

caddy/hugo/setup.go

@@ -18,6 +18,8 @@ import (
 
 // setup configures a new FileManager middleware instance.
 func setup(c *caddy.Controller) error {
+	plugins.RegisterHugo()
+
 	configs, err := parse(c)
 	if err != nil {
 		return err

cmd/filemanager/main.go

@@ -76,6 +76,8 @@ func setupViper() {
 }
 
 func main() {
+	plugins.RegisterHugo()
+
 	setupViper()
 	flag.Parse()
 

plugins/hugo.go

@@ -16,7 +16,12 @@ import (
 	"github.com/robfig/cron"
 )
 
-func init() {
+var (
+	ErrHugoNotFound        = errors.New("It seems that tou don't have 'hugo' on your PATH")
+	ErrUnsupportedFileType = errors.New("The type of the provided file isn't supported for this action")
+)
+
+func RegisterHugo() {
 	filemanager.RegisterPlugin("hugo", filemanager.Plugin{
 		JavaScript:    rice.MustFindBox("./assets/").MustString("hugo.js"),
 		CommandEvents: []string{"before_publish", "after_publish"},
@@ -30,11 +35,6 @@ func init() {
 	})
 }
 
-var (
-	ErrHugoNotFound        = errors.New("It seems that tou don't have 'hugo' on your PATH")
-	ErrUnsupportedFileType = errors.New("The type of the provided file isn't supported for this action")
-)
-
 // Hugo is a hugo (https://gohugo.io) plugin.
 type Hugo struct {
 	// Website root