Fix issue hoedown#125: Don't escape HTML tags in tables of contents.

Before this patch, a header like "# *A*" was displayed as
"<li>&lt;em&gtA&lt;/em&gt;</li>" in the TOC. The error was caused by
toc_header doing the HTML escaping. In the normal HTML renderer, the escaping
is done by the normal_text hook. This patch uses the same handling to
fix the issue.

src/html.c

@@ -586,7 +586,7 @@ toc_header(hoedown_buffer *ob, const hoedown_buffer *content, int level, const h
 		}
 
 		hoedown_buffer_printf(ob, "<a href=\"#toc_%d\">", state->toc_data.header_count++);
-		if (content) escape_html(ob, content->data, content->size);
+		if (content) hoedown_buffer_put(ob, content->data, content->size);
 		HOEDOWN_BUFPUTSL(ob, "</a>\n");
 	}
 }
@@ -654,7 +654,7 @@ hoedown_html_toc_renderer_new(int nesting_level)
 		NULL,
 
 		NULL,
-		NULL,
+		rndr_normal_text,
 
 		NULL,
 		toc_finalize

test/MarkdownTest_1.0.3/Tests/Formatting in Table of Contents.html

@@ -0,0 +1,15 @@
+<ul>
+<li>
+<a href="#toc_0">Header with special &amp; characters</a>
+<ul>
+<li>
+<a href="#toc_1">With <code>Code</code></a>
+<ul>
+<li>
+<a href="#toc_2">With <em>Emphasis</em></a>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>

test/MarkdownTest_1.0.3/Tests/Formatting in Table of Contents.text

@@ -0,0 +1,5 @@
+# Header with special & characters
+
+## With `Code`
+
+### With *Emphasis*

test/config.json

@@ -24,6 +24,11 @@
             "input": "MarkdownTest_1.0.3/Tests/Code Spans.text",
             "output": "MarkdownTest_1.0.3/Tests/Code Spans.html"
         },
+        {
+            "input": "MarkdownTest_1.0.3/Tests/Formatting in Table of Contents.text",
+            "output": "MarkdownTest_1.0.3/Tests/Formatting in Table of Contents.html",
+            "flags": ["--html-toc", "-t", "3"]
+        },
         {
             "input": "MarkdownTest_1.0.3/Tests/Hard-wrapped paragraphs with list-like lines.text",
             "output": "MarkdownTest_1.0.3/Tests/Hard-wrapped paragraphs with list-like lines.html"