From ed399ac3da4dddfd676bedada42a3aa4d4d80e1e Mon Sep 17 00:00:00 2001
From: Dmitry Shachnev <mitya57@gmail.com>
Date: Wed, 25 Sep 2013 11:56:40 +0400
Subject: Add new "permalink" option to toc extension and use it in our docs

---
 markdown/extensions/toc.py | 44 +++++++++++++++++++++++++++++++-------------
 markdown/util.py           |  2 +-
 setup.py                   |  3 ++-
 3 files changed, 34 insertions(+), 15 deletions(-)

diff --git a/markdown/extensions/toc.py b/markdown/extensions/toc.py
index 516f2c5..eba0e69 100644
--- a/markdown/extensions/toc.py
+++ b/markdown/extensions/toc.py
@@ -89,16 +89,24 @@ class TocTreeprocessor(Treeprocessor):
                 yield parent, child
     
     def add_anchor(self, c, elem_id): #@ReservedAssignment
-        if self.use_anchors:
-            anchor = etree.Element("a")
-            anchor.text = c.text
-            anchor.attrib["href"] = "#" + elem_id
-            anchor.attrib["class"] = "toclink"
-            c.text = ""
-            for elem in c.getchildren():
-                anchor.append(elem)
-                c.remove(elem)
-            c.append(anchor)
+        anchor = etree.Element("a")
+        anchor.text = c.text
+        anchor.attrib["href"] = "#" + elem_id
+        anchor.attrib["class"] = "toclink"
+        c.text = ""
+        for elem in c.getchildren():
+            anchor.append(elem)
+            c.remove(elem)
+        c.append(anchor)
+
+    def add_permalink(self, c, elem_id):
+        permalink = etree.Element("a")
+        permalink.text = ("\xb6" if self.use_permalinks is True
+            else self.use_permalinks)
+        permalink.attrib["href"] = "#" + elem_id
+        permalink.attrib["class"] = "headerlink"
+        permalink.attrib["title"] = "Permanent link"
+        c.append(permalink)
     
     def build_toc_etree(self, div, toc_list):
         # Add title to the div
@@ -128,6 +136,9 @@ class TocTreeprocessor(Treeprocessor):
         header_rgx = re.compile("[Hh][123456]")
         
         self.use_anchors = parseBoolValue(self.config["anchorlink"])
+        self.use_permalinks = parseBoolValue(self.config["permalink"], False)
+        if self.use_permalinks is None:
+            self.use_permalinks = self.config["permalink"]
         
         # Get a list of id attributes
         used_ids = set()
@@ -171,8 +182,11 @@ class TocTreeprocessor(Treeprocessor):
                 toc_list.append({'level': tag_level,
                     'id': elem_id,
                     'name': text})
-                
-                self.add_anchor(c, elem_id)
+
+                if self.use_anchors:
+                    self.add_anchor(c, elem_id)
+                if self.use_permalinks:
+                    self.add_permalink(c, elem_id)
                 
         toc_list_nested = order_toc_list(toc_list)
         self.build_toc_etree(div, toc_list_nested)
@@ -202,7 +216,11 @@ class TocExtension(Extension):
                             "Defaults to None"],
                         "anchorlink" : [0,
                             "1 if header should be a self link"
-                            "Defaults to 0"]}
+                            "Defaults to 0"],
+                        "permalink" : [0,
+                            "1 or link text if a Sphinx-style permalink should be added",
+                            "Defaults to 0"]
+                       }
 
         for key, value in configs:
             self.setConfig(key, value)
diff --git a/markdown/util.py b/markdown/util.py
index 0027176..d0ef8a3 100644
--- a/markdown/util.py
+++ b/markdown/util.py
@@ -88,7 +88,7 @@ def parseBoolValue(value, fail_on_errors=True):
     """Parses a string representing bool value. If parsing was successful,
        returns True or False. If parsing was not successful, raises
        ValueError, or, if fail_on_errors=False, returns None."""
-    if not isinstance(value, str):
+    if not isinstance(value, string_type):
         return bool(value)
     elif value.lower() in ('true', 'yes', 'y', 'on', '1'):
         return True
diff --git a/setup.py b/setup.py
index 826de9d..0702f6b 100755
--- a/setup.py
+++ b/setup.py
@@ -144,7 +144,8 @@ class build_docs(Command):
         else:
             with codecs.open('docs/_template.html', encoding='utf-8') as f:
                 template = f.read()
-            self.md = markdown.Markdown(extensions=['extra', 'toc', 'meta', 'admonition', 'smarty'])
+            self.md = markdown.Markdown(
+                extensions=['extra', 'toc(permalink=true)', 'meta', 'admonition', 'smarty'])
             for infile in self.docs:
                 outfile, ext = os.path.splitext(infile)
                 if ext == '.txt':
-- 
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