From 24e41081ef9b79b758254b8361bcfee3ba22f02b Mon Sep 17 00:00:00 2001
From: Jay Adkisson <jjmadkisson@gmail.com>
Date: Sun, 23 Dec 2012 00:59:13 -0800
Subject: [PATCH] add a data-uri function

as described in a comment on #775
---
 lib/less/functions.js    | 14 ++++++++++++++
 test/css/functions.css   |  3 +++
 test/data/image.jpg      |  1 +
 test/less/functions.less |  4 ++++
 4 files changed, 22 insertions(+)
 create mode 100644 test/data/image.jpg

diff --git a/lib/less/functions.js b/lib/less/functions.js
index bb10cad2..f658f5cc 100644
--- a/lib/less/functions.js
+++ b/lib/less/functions.js
@@ -1,3 +1,5 @@
+var fs = require('fs');
+
 (function (tree) {
 
 tree.functions = {
@@ -345,6 +347,18 @@ tree.functions = {
     },
     shade: function(color, amount) {
         return this.mix(this.rgb(0, 0, 0), color, amount);
+    },
+    "data-uri": function(mimetype, path) {
+        var data = fs.readFileSync(path.value);
+        mimetype = mimetype.value;
+
+        if (/;base64$/.test(mimetype)) {
+          data = (new Buffer(data)).toString('base64');
+        }
+
+        var contents = new(tree.Anonymous)('data:'+mimetype+','+data);
+
+        return new(tree.URL)(contents);
     }
 };
 
diff --git a/test/css/functions.css b/test/css/functions.css
index c480a231..caa2a745 100644
--- a/test/css/functions.css
+++ b/test/css/functions.css
@@ -99,3 +99,6 @@
   average: #7b007b;
   negation: #d73131;
 }
+#data-uri {
+  background-image: url(data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==);
+}
diff --git a/test/data/image.jpg b/test/data/image.jpg
new file mode 100644
index 00000000..83f77790
--- /dev/null
+++ b/test/data/image.jpg
@@ -0,0 +1 @@
+not actually a jpeg file
diff --git a/test/less/functions.less b/test/less/functions.less
index 780ef2cb..4a4ec5b0 100644
--- a/test/less/functions.less
+++ b/test/less/functions.less
@@ -110,3 +110,7 @@
   average: average(#f60000, #0000f6);
   negation: negation(#f60000, #313131);
 }
+
+#data-uri {
+  background-image: data-uri('image/jpeg;base64', 'test/data/image.jpg');
+}