[Setup] Add a CleanDocs class

setup.py

@@ -19,6 +19,7 @@ from distutils import cmd
 from distutils.command.build import build as _build
 from distutils.command.clean import clean as _clean
 from distutils.command.install_data import install_data as _install_data
+from shutil import rmtree
 
 from setuptools import find_packages, setup
 from setuptools.command.test import test as _test
@@ -70,6 +71,25 @@ class BuildDocs(BuildDoc):
         BuildDoc.run(self)
 
 
+class CleanDocs(cmd.Command):
+    description = 'Clean the documentation build and rst files'
+    user_options = []
+
+    def initialize_options(self):
+        pass
+
+    def finalize_options(self):
+        pass
+
+    def run(self):
+        for docs_dir in ('docs/build', 'docs/source/modules'):
+            try:
+                print('Deleting {}'.format(docs_dir))
+                rmtree(docs_dir)
+            except OSError:
+                pass
+
+
 class BuildWebUI(cmd.Command):
     description = 'Minify WebUI files'
 
@@ -324,6 +344,7 @@ cmdclass = {
     'build_docs': BuildDocs,
     'install_data': InstallData,
     'clean_plugins': CleanPlugins,
+    'clean_docs': CleanDocs,
     'clean': Clean,
     'egg_info_plugins': EggInfoPlugins,
     'test': PyTest,

tox.ini

@@ -178,10 +178,8 @@ whitelist_externals =
 [testenv:docs]
 sitepackages = {[docsbase]sitepackages}
 deps = {[docsbase]deps}
-whitelist_externals =
-    bash
 commands =
-    bash -c 'rm -f docs/source/modules/*.rst'
+    python setup.py clean_docs
     python -c "print '> sphinx-apidoc --force -o docs/source/modules/ deluge deluge/plugins\n'\
         '> sphinx-build -v -E -T -b html -d docs/build/doctrees docs/source docs/build/html';\
         import subprocess, sys; proc = subprocess.Popen(\