Moved rewrite middleware into its own package

middleware/rewrite.go → middleware/rewrite/rewrite.go

-package middleware
-
-import "net/http"
-
-// Rewrite is middleware for rewriting requests internally to
+// Package rewrite is middleware for rewriting requests internally to
 // a different path.
-func Rewrite(p parser) Middleware {
+package rewrite
 
-	// Rewrite describes an internal location rewrite rule.
-	type rewrite struct {
-		From string
-		To   string
-	}
+import (
+	"net/http"
+
+	"github.com/mholt/caddy/middleware"
+)
 
+// New instantiates a new rewrite middleware.
+func New(c middleware.Controller) (middleware.Middleware, error) {
 	var rewrites []rewrite
 
-	for p.Next() {
+	for c.Next() {
 		var rule rewrite
 
-		if !p.NextArg() {
-			return p.ArgErr()
+		if !c.NextArg() {
+			return nil, c.ArgErr()
 		}
-		rule.From = p.Val()
+		rule.From = c.Val()
 
-		if !p.NextArg() {
-			return p.ArgErr()
+		if !c.NextArg() {
+			return nil, c.ArgErr()
 		}
-		rule.To = p.Val()
+		rule.To = c.Val()
 
 		rewrites = append(rewrites, rule)
 	}
@@ -40,5 +38,11 @@ func Rewrite(p parser) Middleware {
 			}
 			next(w, r)
 		}
-	}
+	}, nil
+}
+
+// rewrite describes an internal location rewrite rule.
+type rewrite struct {
+	From string
+	To   string
 }