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: I6e4f6372ff026a9eb379ee06c683451f58a99976
Story: 2006075
Task: 34812

doc/requirements.txt

@@ -5,4 +5,5 @@
 openstackdocstheme>=1.30.0 # Apache-2.0
 sphinx>=1.6.2,!=1.6.6,!=1.6.7,<2.0.0;python_version=='2.7'  # BSD
 sphinx>=1.6.2,!=1.6.6,!=1.6.7,!=2.1.0;python_version>='3.4' # BSD
+sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD
 reno>=2.5.0 # Apache-2.0

doc/source/conf.py

@@ -23,6 +23,7 @@ extensions = [
     'cliff.sphinxext',
     'sphinx.ext.autodoc',
     'openstackdocstheme',
+    'sphinxcontrib.rsvgconverter',
 ]
 
 autoprogram_cliff_ignored = [
@@ -74,14 +75,30 @@ html_last_updated_fmt = '%Y-%m-%d %H:%M'
 # Output file base name for HTML help builder.
 htmlhelp_basename = '%sdoc' % project
 
+
+# -- Options for LaTeX output ---------------------------------------------
+
+# 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', 'howto', True),
 ]
 
 # Example configuration for intersphinx: refer to the Python standard library.

tox.ini

@@ -51,6 +51,16 @@ basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
+[testenv:pdf-docs]
+basepython = python3
+envdir = {toxworkdir}/docs
+deps = {[testenv:docs]deps}
+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.