From a528267f181a130c9b507dc172df4f997ec078ab Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Sat, 17 Aug 2013 00:20:05 +0100
Subject: [PATCH] Add support for an externally provided asset map

This allows an embedding site to provide a map from individual
asset names to the URLs to use, thus allowing them to be served
through (for example) the rails asset pipeline.
---
 js/id/id.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/js/id/id.js b/js/id/id.js
index d8c5e565a..cbfd267ec 100644
--- a/js/id/id.js
+++ b/js/id/id.js
@@ -212,8 +212,16 @@ window.iD = function () {
         return context;
     };
 
+    var assetMap = {};
+    context.assetMap = function(_) {
+        if (!arguments.length) return assetMap;
+        assetMap = _;
+        return context;
+    };
+
     context.imagePath = function(_) {
-        return assetPath + 'img/' + _;
+        var asset = 'img/' + _;
+        return assetMap[asset] || assetPath + asset;
     };
 
     context.toggleFullscreen = function() {