Moved extensionless middleware into its own package

middleware/extensionless.go → middleware/extensionless/extensionless.go

-package middleware
+// Extensionless is middleware for clean URLs. A root path is
+// passed in as well as possible extensions to add, internally,
+// to paths requested. The first path+ext that matches a resource
+// that exists will be used.
+package extensionless
 
 import (
 	"net/http"
 	"os"
 	"strings"
+
+	"github.com/mholt/caddy/middleware"
 )
 
-// Extensionless is middleware for clean URLs. A root path is
-// passed in as well as possible extensions to add, internally,
-// to paths requested. The first path+ext that matches a resource
-// that exists will be used.
-func Extensionless(p parser) Middleware {
+// New creates a new instance of middleware that assumes extensions
+// so the site can use cleaner, extensionless URLs
+func New(c middleware.Controller) (middleware.Middleware, error) {
 	var extensions []string
-	var root = p.Root() // TODO: Big gotcha! Save this now before it goes away! We can't get this later during a request!
+	var root = c.Root() // TODO: Big gotcha! Save this now before it goes away! We can't get this later during a request!
 
-	for p.Next() {
-		if !p.NextArg() {
-			return p.ArgErr()
+	for c.Next() {
+		if !c.NextArg() {
+			return nil, c.ArgErr()
 		}
-		extensions = append(extensions, p.Val())
-		for p.NextArg() {
-			extensions = append(extensions, p.Val())
+		extensions = append(extensions, c.Val())
+		for c.NextArg() {
+			extensions = append(extensions, c.Val())
 		}
 	}
 
@@ -53,5 +57,5 @@ func Extensionless(p parser) Middleware {
 			}
 			next(w, r)
 		}
-	}
+	}, nil
 }