From 2e391a5ca1c93bfe448876fc2a7c8e2bb5e93a03 Mon Sep 17 00:00:00 2001
From: Wouter Admiraal <wouter.admiraal@sonarsource.com>
Date: Thu, 23 May 2019 14:49:55 +0200
Subject: [PATCH] Allow trailing spaces in code blocks

---
 lib/md009.js                | 6 ++++--
 test/code_block_fenced.md   | 7 +++++++
 test/code_block_indented.md | 6 +++++-
 test/trailing_spaces_br.md  | 2 ++
 4 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/lib/md009.js b/lib/md009.js
index 18add32e..dfe9c59b 100644
--- a/lib/md009.js
+++ b/lib/md009.js
@@ -30,9 +30,11 @@ module.exports = {
       listItemLineNumbers.sort((a, b) => a - b);
     }
     const expected = (brSpaces < 2) ? 0 : brSpaces;
-    forEachLine(lineMetadata(), (line, lineIndex) => {
+    let inFencedCode = 0;
+    forEachLine(lineMetadata(), (line, lineIndex, inCode, onFence) => {
+      inFencedCode += onFence;
       const lineNumber = lineIndex + 1;
-      if (trailingSpaceRe.test(line) &&
+      if ((!inCode || inFencedCode !== 0) && trailingSpaceRe.test(line) &&
         !includesSorted(listItemLineNumbers, lineNumber)) {
         const actual = line.length - line.trimRight().length;
         if (expected !== actual) {
diff --git a/test/code_block_fenced.md b/test/code_block_fenced.md
index 4c05b627..c893670e 100644
--- a/test/code_block_fenced.md
+++ b/test/code_block_fenced.md
@@ -9,9 +9,16 @@ And here is more text
 This is a code block that won't trigger.
 ```
 
+```text
+This is code
+ 
+with an empty line.
+```
+
 But we'll do another:
 
     And this {MD046}
     will.
 
 Final text is here
+{MD009:14}
diff --git a/test/code_block_indented.md b/test/code_block_indented.md
index ae443f7e..5576dcd8 100644
--- a/test/code_block_indented.md
+++ b/test/code_block_indented.md
@@ -14,4 +14,8 @@ But we'll do another:
     And this
     will.
 
-Final text is here
+One last one:
+
+    This is code
+    
+    with an empty indented line.
diff --git a/test/trailing_spaces_br.md b/test/trailing_spaces_br.md
index a619772b..861de197 100644
--- a/test/trailing_spaces_br.md
+++ b/test/trailing_spaces_br.md
@@ -1,4 +1,6 @@
 This line has a single trailing space {MD009} 
 This line has two trailing spaces and should be allowed  
 This line has three trailing spaces {MD009}   
+ 
+{MD009:4}
 This line has four trailing spaces {MD009}