Setup a tox pep8 check and update test-requirements.txt

Add a tox pep8 check.
Fix PEP8 error in tools/list_ptls.py

Update test-requirements.txt for libraries used.

Change-Id: I179036ebbce555586a711677f45337b364d4847f

test-requirements.txt

@@ -1 +1,4 @@
+hacking<0.11,>=0.10.0
+PyYAML>=3.1.0  # MIT
+requests>=2.10.0  # Apache-2.0
 yaml2ical>=0.6.1

test_tools/flake8wrap.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+#
+# A simple wrapper around flake8 which makes it possible
+# to ask it to only verify files changed in the current
+# git HEAD patch.
+#
+# Intended to be invoked via tox:
+#
+#   tox -epep8 -- -HEAD
+#
+
+if test "x$1" = "x-HEAD" ; then
+    shift
+    files=$(git diff --name-only HEAD~1 | tr '\n' ' ')
+    echo "Running flake8 on ${files}"
+    diff -u --from-file /dev/null ${files} | flake8 --diff "$@"
+else
+    echo "Running flake8 on all files"
+    exec flake8 "$@"
+fi

tools/list_ptls.py

@@ -22,6 +22,7 @@ import yaml
 
 PROJECTS_LIST = "http://git.openstack.org/cgit/openstack/governance/plain/reference/projects.yaml"  # noqa
 
+
 def main():
     parser = argparse.ArgumentParser()
     parser.add_argument(

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = ical
+envlist = ical,pep8
 minversion = 1.6
 skipsdist = True
 
@@ -7,12 +7,12 @@ skipsdist = True
 install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/test-requirements.txt
-whitelist_externals = mkdir
 
 [testenv:venv]
 commands = {posargs}
 
 [testenv:ical]
+whitelist_externals = mkdir
 commands =
     mkdir -p output/calendars
     yaml2ical -n "OpenStack Meetings" \
@@ -24,3 +24,16 @@ commands =
 [testenv:check]
 commands =
     python tools/check_channels.py -y meetings
+
+[testenv:pep8]
+whitelist_externals = bash
+commands =
+  bash test_tools/flake8wrap.sh {posargs}
+
+[flake8]
+ignore =
+exclude =  .git,.tox
+max-complexity = 14
+
+[hacking]
+import_exceptions =