Build pdf docs

Add a new pdf-docs environment to enable PDF build.

Change-Id: I59bdc7cf339b022458b3b0d1fa3b694b7998c20f

doc/source/conf.py

@@ -88,6 +88,17 @@ latex_documents = [
     ),
 ]
 
+# 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}',
+}
+
 # openstackdocstheme options
 repository_name = 'openstack/python-watcherclient'
 bug_project = 'python-watcherclient'

tox.ini

@@ -48,6 +48,18 @@ deps =
   -r{toxinidir}/doc/requirements.txt
 commands = python setup.py build_sphinx
 
+[testenv:pdf-docs]
+basepython = python3
+envdir = {toxworkdir}/docs
+deps = {[testenv:docs]deps}
+whitelist_externals =
+  rm
+  make
+commands =
+  rm -rf doc/build/pdf
+  sphinx-build -W -b latex doc/source doc/build/pdf
+  make -C doc/build/pdf
+
 [testenv:debug]
 basepython = python3
 commands = oslo_debug_helper -t watcherclient/tests/unit {posargs}