Generate PDF documentation

This commit adds a new tox target to build PDF documentation.
It's a part of community goal, see storyboard for more
information.

Change-Id: I04b9253ae30ec125e45a272f0c7ce384c7770372
Story: 2006076
Task: 35607

doc/requirements.txt

@@ -0,0 +1,2 @@
+openstackdocstheme>=1.30.0 # Apache-2.0
+sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD

doc/source/conf.py

@@ -23,6 +23,7 @@ extensions = [
     'sphinx.ext.autodoc',
     # 'sphinx.ext.intersphinx',
     'openstackdocstheme',
+    'sphinxcontrib.rsvgconverter'
 ]
 
 # autodoc generation is a bit aggressive and a nuisance when doing heavy
@@ -64,14 +65,27 @@ htmlhelp_basename = '%sdoc' % project
 # html_last_updated_fmt = '%b %d, %Y'
 html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
+# Disable usage of xindy https://bugzilla.redhat.com/show_bug.cgi?id=1643664
+latex_use_xindy = False
+
+latex_domain_indices = False
+
+latex_elements = {
+    'makeindex': '',
+    'printindex': '',
+    'preamble': r'\setcounter{tocdepth}{3}',
+}
+
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass
 # [howto/manual]).
+# NOTE: Specify toctree_only=True for a better document structure of
+# the generated PDF file.
 latex_documents = [
     ('index',
-     '%s.tex' % project,
+     'doc-%s.tex' % project,
      u'%s Documentation' % project,
-     u'OpenStack Foundation', 'manual'),
+     u'OpenStack Foundation', 'manual', True),
 ]
 
 # Example configuration for intersphinx: refer to the Python standard library.

tox.ini

@@ -59,7 +59,18 @@ commands = python setup.py test --coverage --testr-args='{posargs}'
 
 [testenv:docs]
 basepython = python3
-commands = python setup.py build_sphinx
+deps = -r{toxinidir}/doc/requirements.txt
+commands = sphinx-build -W -b html -d doc/build/doctrees doc/source doc/build/html
+
+[testenv:pdf-docs]
+basepython = python3
+deps = -r{toxinidir}/doc/requirements.txt
+envdir = {toxworkdir}/docs
+whitelist_externals =
+  make
+commands =
+  sphinx-build -W -b latex doc/source doc/build/pdf
+  make -C doc/build/pdf
 
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.