From 6189b03ede982d4ee19e8972dc134f7f708aa8fc Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Wed, 4 Feb 2015 19:37:40 +0000
Subject: Escape special markdown characters

---
 lib/writers/markdown-writer.js         | 8 +++++++-
 tests/writers/markdown-writer.tests.js | 6 ++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/writers/markdown-writer.js b/lib/writers/markdown-writer.js
index 77bae94..9bafc98 100644
--- a/lib/writers/markdown-writer.js
+++ b/lib/writers/markdown-writer.js
@@ -151,7 +151,7 @@ function markdownWriter() {
     }
     
     function text(value) {
-        fragments.push(value);
+        fragments.push(escapeMarkdown(value));
     }
     
     function append(html) {
@@ -174,3 +174,9 @@ function markdownWriter() {
 }
 
 exports.writer = markdownWriter;
+
+function escapeMarkdown(value) {
+    return value
+        .replace(/\\/g, '\\\\')
+        .replace(/([\`\*_\{\}\[\]\(\)\#\+\-\.\!])/g, '\\$1');
+}
diff --git a/tests/writers/markdown-writer.tests.js b/tests/writers/markdown-writer.tests.js
index e13046a..7912acf 100644
--- a/tests/writers/markdown-writer.tests.js
+++ b/tests/writers/markdown-writer.tests.js
@@ -4,6 +4,12 @@ var test = require("../testing").test;
 var mdWriter = require("../../lib/writers/markdown-writer");
 
 describe('markdown-writer', function() {
+    test('special markdown characters are escaped', function() {
+        var writer = mdWriter.writer();
+        writer.text("\\*");
+        return assert.equal(writer.asString(), "\\\\\\*");
+    });
+
     test('can generate a paragraph', function() {
         var writer = mdWriter.writer();
         writer.open("p");
-- 
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