Fix incorrect parsing when headings have attributes

Closes #4

_includes/toc.html

@@ -44,10 +44,11 @@
         {% assign indentAmount = headerLevel | minus: minHeader | add: 1 %}
         {% assign _workspace = node | split: '</h' %}
 
-        {% assign _idWorkspace = _workspace[0] | split: '"' %}
-        {% assign html_id = _idWorkspace[1] %}
+        {% assign _idWorkspace = _workspace[0] | split: 'id="' %}
+        {% assign _idWorkspace = _idWorkspace[1] | split: '"' %}
+        {% assign html_id = _idWorkspace[0] %}
 
-        {% capture _hAttrToStrip %}{{ headerLevel }} id="{{ html_id }}">{% endcapture %}
+        {% capture _hAttrToStrip %}{{ _workspace[0] | split: '>' | first }}>{% endcapture %}
         {% assign header = _workspace[0] | replace: _hAttrToStrip, '' %}
 
         {% assign space = '' %}

_tests/headingWithClasses.md

@@ -0,0 +1,19 @@
+---
+# See https://github.com/allejo/jekyll-toc/issues/4
+---
+
+{% capture markdown %}
+# Miscellaneous features
+{: .hide-from-excerpt}
+
+Lorem ipsum dolor sit amet, consectetur adipisicing elit.
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text %}
+
+<!-- /// -->
+
+<ul>
+    <li><a href="#miscellaneous-features">Miscellaneous features</a></li>
+</ul>

_tests/headingWithClassesAndTags.md

@@ -0,0 +1,16 @@
+---
+---
+
+{% capture markdown %}
+# Miscellaneous **features**
+{: #custom-heading}
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text %}
+
+<!-- /// -->
+
+<ul>
+    <li><a href="#custom-heading">Miscellaneous <strong>features</strong></a></li>
+</ul>

_tests/headingWithClassesAndTagsButSanitized.md

@@ -0,0 +1,16 @@
+---
+---
+
+{% capture markdown %}
+# Miscellaneous **features**
+{: #custom-heading}
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text sanitize=true %}
+
+<!-- /// -->
+
+<ul>
+    <li><a href="#custom-heading">Miscellaneous features</a></li>
+</ul>

_tests/headingWithCustomID.md

@@ -0,0 +1,16 @@
+---
+---
+
+{% capture markdown %}
+# Miscellaneous features
+{: #custom-heading}
+{% endcapture %}
+{% assign text = markdown | markdownify %}
+
+{% include toc.html html=text %}
+
+<!-- /// -->
+
+<ul>
+    <li><a href="#custom-heading">Miscellaneous features</a></li>
+</ul>