From 5e50c4624feeccd97d02c20e0c0f95d24aef9d61 Mon Sep 17 00:00:00 2001
From: Robin Ward <robin.ward@gmail.com>
Date: Thu, 22 Aug 2013 13:46:51 -0400
Subject: [PATCH] FIX: New lines in code blocks were somewhat unpredictable

---
 .../discourse/dialects/github_code_dialect.js         | 11 ++++++++---
 test/javascripts/components/markdown_test.js          |  4 ++++
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/app/assets/javascripts/discourse/dialects/github_code_dialect.js b/app/assets/javascripts/discourse/dialects/github_code_dialect.js
index 425194dfb1a..ffa747e5843 100644
--- a/app/assets/javascripts/discourse/dialects/github_code_dialect.js
+++ b/app/assets/javascripts/discourse/dialects/github_code_dialect.js
@@ -42,15 +42,19 @@ Discourse.Dialect.on("register", function(event) {
 
       if (m[2]) { next.unshift(MD.mk_block(m[2], null, lineNumber + 1)); }
 
+      lineNumber++;
       while (next.length > 0) {
         var b = next.shift(),
-            n = b.match(/([^`]*)```([^`]*)/m),
-            diff = ((typeof b.lineNumber === "undefined") ? lineNumber : b.lineNumber) - lineNumber;
+            blockLine = b.lineNumber,
+            diff = ((typeof blockLine === "undefined") ? lineNumber : blockLine) - lineNumber;
+
+        b = b.replace(/ {2}\n/g, "\n");
+        var n = b.match(/([^`]*)```([^`]*)/m);
 
-        lineNumber = b.lineNumber;
         for (var i=1; i<diff; i++) {
           codeContents.push("");
         }
+        lineNumber = blockLine + b.split("\n").length - 1;
 
         if (n) {
           if (n[2]) {
@@ -63,6 +67,7 @@ Discourse.Dialect.on("register", function(event) {
           codeContents.push(b);
         }
       }
+
       result.push(['p', ['pre', ['code', {'class': m[1] || 'lang-auto'}, codeContents.join("\n") ]]]);
       return result;
     }
diff --git a/test/javascripts/components/markdown_test.js b/test/javascripts/components/markdown_test.js
index b4757545d38..fa2a6d5315d 100644
--- a/test/javascripts/components/markdown_test.js
+++ b/test/javascripts/components/markdown_test.js
@@ -168,6 +168,10 @@ test("Oneboxing", function() {
 
 test("Code Blocks", function() {
 
+  cooked("```\na\nb\nc\n\nd\n```",
+         "<p><pre><code class=\"lang-auto\">a\nb\nc\n\nd</code></pre></p>",
+         "it treats new lines properly");
+
   cooked("```\ntest\n```",
          "<p><pre><code class=\"lang-auto\">test</code></pre></p>",
          "it supports basic code blocks");