From 48138c786125f43a89ea0c61718de9cdd6da0b50 Mon Sep 17 00:00:00 2001
From: Carlo Zancanaro <carlo@clearboxsystems.com.au>
Date: Mon, 2 Sep 2013 10:37:32 +1000
Subject: Return nil on failure (instead of throwing), eval context with args
 as provided (instead of nil)

---
 src/reverse_routing/core.clj | 50 +++++++++++++++++++++++---------------------
 1 file changed, 26 insertions(+), 24 deletions(-)

(limited to 'src')

diff --git a/src/reverse_routing/core.clj b/src/reverse_routing/core.clj
index 4299eba..1977b2a 100644
--- a/src/reverse_routing/core.clj
+++ b/src/reverse_routing/core.clj
@@ -6,17 +6,17 @@
 (def ^:private ^:dynamic *lookup-route* nil)
 (def ^:private ^:dynamic *root* nil)
 
+(defn ^:private deref-if-var [arg]
+  (if (var? arg)
+    (deref arg)
+    arg))
+
 (defn wrap-reverse-routing [handler & {:keys [root] :or {:root ""}}]
   (fn [request]
     (binding [*lookup-route* (->> handler deref-if-var meta ::lookup)
               *root* root]
       (handler request))))
 
-(defn ^:private deref-if-var [arg]
-  (if (var? arg)
-    (deref arg)
-    arg))
-
 (defn ^:private lookup-route [route & handlers]
   (->> handlers
        (map (comp ::lookup meta deref-if-var))
@@ -33,7 +33,7 @@
   `(let ~bindings (routes ~@handlers)))
 
 (defmacro when-routes [cond & handlers]
-  `(when ~cond (routes ~@handlers)))
+  `(if ~cond (routes ~@handlers) (routes)))
 
 (defmacro defroutes [name & handlers]
   `(def ~name (routes ~@handlers)))
@@ -42,15 +42,16 @@
   (let [string-path (if (vector? path) (first path) path)
         path-keys (vec (:keys (clout.core/route-compile string-path)))
         keylen (count path-keys)
-        lookup-fn `(fn [[route-name# args-count#]]
-                     (let [~args (repeat nil) ;; hacky, but necessary - provide nil values for args
-                           r# (#'lookup-route [route-name# (- args-count# ~keylen)]
-                                              ~@routes)
-                           {uri# :uri, args# :args} r#]
-                       (if r#
-                         (assoc r#
-                           :uri (str ~string-path uri#)
-                           :args (vec (concat ~path-keys args#))))))]
+        lookup-fn `(fn [[route-name# args#]]
+                     (if (>= (count args#) ~keylen)
+                       (let [~args args# 
+                             r# (#'lookup-route [route-name# (vec (drop ~keylen args#))]
+                                                ~@routes)
+                             {uri# :uri, args# :args} r#]
+                         (if r#
+                           (assoc r#
+                             :uri (str ~string-path uri#)
+                             :args (vec (concat ~path-keys args#)))))))]
     `(vary-meta (compojure.core/context ~path ~args
                   (routes ~@routes))
                 assoc ::lookup ~lookup-fn)))
@@ -58,20 +59,21 @@
 (defmacro register-route [route-name [type path args & body :as route]]
   (let [string-path (if (vector? path) (first path) path)
         route-args (:keys (clout.core/route-compile string-path))
-        route-id [route-name (count route-args)]
         routes-map {:uri string-path
                     :type (keyword (string/lower-case (name type)))
                     :args (vec route-args)}]
     `(vary-meta ~route
-                assoc ::lookup (fn [signature#]
-                                 (if (= signature# ~route-id)
+                assoc ::lookup (fn [[name# args#]]
+                                 (if (and (= name# ~route-name)
+                                          (= (count args#) (count ~(vec route-args))))
                                    ~routes-map)))))
 
 (defn url-for [route & arg-values]
-  (let [{:keys [uri type args]} (*lookup-route* [route (count arg-values)])
+  (let [spec (*lookup-route* [route arg-values])
+        {:keys [uri type args]} spec
         root-path *root*]
-    (assert uri)
-    (str root-path
-         (reduce (fn [string [name val]]
-                   (clojure.string/replace string (str name) (str val)))
-                 uri (map vector args arg-values)))))
+    (if spec
+      (str root-path
+           (reduce (fn [string [name val]]
+                     (clojure.string/replace string (str name) (str val)))
+                   uri (map vector args arg-values))))))
-- 
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