Complete deprecated page.progress and this.navigation

1 files changed, 19 insertions, 4 deletions

diff --git a/lib/api/deprecate.js b/lib/api/deprecate.js
index 73ca8be..fd9280f 100644
--- a/lib/api/deprecate.js
+++ b/lib/api/deprecate.js
@@ -1,3 +1,5 @@
+var is = require('is');
+
 var logged = {};
 var disabled = {};
 
@@ -40,19 +42,32 @@ function deprecateMethod(book, key, fn, msg) {
     @param {Book|Output} book
     @param {String} key: unique identitifer for the deprecated
     @param {Object} instance
-    @param {String} property
+    @param {String|Function} property
     @param {String} msg: message to print when called
     @return {Function}
 */
 function deprecateField(book, key, instance, property, value, msg) {
+    var store = undefined;
+
+    var prepare = function() {
+        if (!is.undefined(store)) return;
+
+        if (is.fn(value)) store = value();
+        else store = value;
+    }
+
     var getter = function(){
+        prepare();
+
         logNotice(book, key, msg);
-        return value;
+        return store;
     };
     var setter = function(v) {
+        prepare();
+
         logNotice(book, key, msg);
-        value = v;
-        return value;
+        store = v;
+        return store;
     };
 
     Object.defineProperty(instance, property, {