Add a CMakeLists.txt which provides the 'manual' target for building the Sphinx documentation. This may require you to set the SPHINXBUILD_EXECUTABLE CMake variable to the sphinx-build executable

Change the file extension to 'rst' rather than 'txt' to avoid clashes with CMakeLists.txt and to help syntax highlighting.

Add the doxylink Sphinx extension from sphinx-contrib to provide Doxygen links.

documentation/_extensions/sphinxcontrib/LICENSE

@@ -0,0 +1,28 @@
+If not otherwise noted, the extensions in this package are licensed
+under the following license.
+
+Copyright (c) 2010 Matt Williams.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

documentation/_extensions/sphinxcontrib/__init__.py

@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+"""
+    sphinxcontrib
+    ~~~~~~~~~~~~~
+
+    This package is a namespace package that contains all extensions
+    distributed in the ``sphinx-contrib`` distribution.
+
+    :copyright: Copyright 2007-2009 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+__import__('pkg_resources').declare_namespace(__name__)
+

documentation/_extensions/sphinxcontrib/doxylink.py

@@ -0,0 +1,148 @@
+# -*- coding: utf-8 -*-
+"""
+doxylink
+~~~~~~~~
+
+Sphinx extension to link to external Doxygen API documentation.
+
+It works much like the extlinks extension but it does some more processing to link C++ symbols against their Doxygen HTML documentation.
+
+.. confval:: doxylink
+
+	The environment is set up with a dictionary mapping the interpereted text role
+	to a tuple of tag file and prefix:
+
+	.. code-block:: python
+
+		doxylink = {
+			'polyvox' : ('/home/matt/PolyVox.tag', '/home/matt/PolyVox/html/'),
+			'qtogre' : ('/home/matt/QtOgre.tag', '/home/matt/QtOgre/html/'),
+		}
+
+This allows one to do:
+
+.. code-block:: rst
+
+	:polyvox:`Array <PolyVox::Array>`.
+	:polyvox:`PolyVox::Volume`
+	:qtogre:`QtOgre::Log`
+	:polyvox:`tidyUpMemeory(int) <tidyUpMemory>`
+	:polyvox:`PolyVox::Array::operator[]`
+
+:requires: Python 2.5
+
+.. todo::
+	
+	Make the extension atuomatically re-run if the tag file is altered on disc
+	
+	Find a way to parse the tag file to a DOM tree *once* and then just reference it from then on.
+
+:copyright: Copyright 2010 by Matt Williams
+:license: BSD, see LICENSE for details.
+"""
+
+from docutils import nodes, utils
+
+from sphinx.util.nodes import split_explicit_title
+
+import xml.etree.ElementTree as ET
+
+def find_url(doc, symbol):
+	"""
+	Return the URL for a given symbol.
+	
+	This is where the magic happens.
+	This function could be a lot more clever. At present it required the passed symbol to be almost exactly the same as the entries in the Doxygen tag file.
+	
+	.. todo::
+		
+		Maybe print a list of all possible matches as a warning (but still only return the first)
+	
+	:Parameters:
+		doc : xml.etree.ElementTree
+			The XML DOM object
+		symbol : string
+			The symbol to lookup in the file. E.g. something like 'PolyVox::Array' or 'tidyUpMemory'
+	
+	:return: String representing the filename part of the URL
+	"""
+	
+	#First check for an exact match with a top-level object (namespaces, objects etc.)
+	
+	#env = inliner.document.settings.env
+	
+	matches = []
+	for compound in doc.findall('.//compound'):
+		if compound.find('name').text == symbol:
+			matches += [compound.find('filename').text]
+	
+	if len(matches) > 1:
+		pass
+		#env.warn(env.docname, 'There were multiple matches for `%s`: %s' % (symbol, matches))
+	if len(matches) == 1:
+		return matches[0]
+	
+	
+	#Strip off first namespace bit of the compound name so that 'ArraySizes' can match 'PolyVox::ArraySizes'
+	for compound in doc.findall('.//compound'):
+		symbol_list = compound.find('name').text.split('::', 1)
+		if len(symbol_list) == 2:
+			reducedsymbol = symbol_list[1]
+			if reducedsymbol == symbol:
+				return compound.find('filename').text
+	
+	#Now split the symbol by '::'. Find an exact match for the first part and then a member match for the second
+	#So PolyVox::Array::operator[] becomes like {namespace: "PolyVox::Array", endsymbol: "operator[]"}
+	symbol_list = symbol.rsplit('::', 1)
+	if len(symbol_list) == 2:
+		namespace = symbol_list[0]
+		endsymbol = symbol_list[1]
+		for compound in doc.findall('.//compound'):
+			if compound.find('name').text == namespace:
+				for member in compound.findall('member'):
+#					#If this compound object contains the matching member then return it
+					if member.find('name').text == endsymbol:
+						return member.find('anchorfile').text + '#' + member.find('anchor').text
+	
+	#Then we'll look at unqualified members
+	for member in doc.findall('.//member'):
+		if member.find('name').text == symbol:
+			return member.find('anchorfile').text + '#' + member.find('anchor').text
+	
+	return None
+
+def create_role(app, tag_filename, rootdir):
+	def find_doxygen_link(name, rawtext, text, lineno, inliner, options={}, content=[]):
+		text = utils.unescape(text)
+		# from :name:`title <part>`
+		has_explicit_title, title, part = split_explicit_title(text)
+		
+		try:
+			tag_file = ET.parse(tag_filename)
+		except (IOError):
+			env = inliner.document.settings.env
+			env.warn(env.docname, 'Could not open %s' % tag_filename)
+		else:
+			url = find_url(tag_file, part)
+			if url:
+				full_url = rootdir + url
+				pnode = nodes.reference(title, title, internal=False, refuri=full_url)
+				return [pnode], []
+			#By here, no match was found
+			env = app.env
+			env.warn(env.docname, 'Could not find match for `%s` in `%s` tag file' % (part, tag_filename), lineno)
+			
+		full_url="#"
+		#TODO find which command to use to just output it as plain text (no link) in this case
+		pnode = nodes.reference(title, title, internal=False, refuri=full_url)
+		return [pnode], []
+		
+	return find_doxygen_link
+
+def setup_doxylink_roles(app):
+	for name, [tag_filename, rootdir] in app.config.doxylink.iteritems():
+		app.add_role(name, create_role(app, tag_filename, rootdir))
+
+def setup(app):
+	app.add_config_value('doxylink', {}, 'env')
+	app.connect('builder-inited', setup_doxylink_roles)