Merge "tox: make it possible to run pep8 on current patch only"

tools/flake8wrap.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+#
+# 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

tox.ini

@@ -27,7 +27,7 @@ downloadcache = ~/cache/pip
 
 [testenv:pep8]
 commands =
-  flake8 {posargs}
+  bash tools/flake8wrap.sh {posargs}
 
 [testenv:py34]
 setenv = {[testenv]setenv}