From 334e08121c8cf7093eb8784c09e6addbc5c6c52a Mon Sep 17 00:00:00 2001
From: Tom Barron <tpb@dyncloud.net>
Date: Sun, 21 Feb 2016 09:14:13 -0500
Subject: [PATCH] Add tox fast8 option

This commit ports over the fast8 option from cinder, which enables
one to run pep8 only on one's changeset rather than against the
whole body of code via:
     tox -efast8

Change-Id: Icb0286c3c66983f2f106c163cb11c690b2c57849
---
 tools/fast8.sh | 15 +++++++++++++++
 tox.ini        |  4 ++++
 2 files changed, 19 insertions(+)
 create mode 100755 tools/fast8.sh

diff --git a/tools/fast8.sh b/tools/fast8.sh
new file mode 100755
index 0000000000..2b3e22abda
--- /dev/null
+++ b/tools/fast8.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+cd $(dirname "$0")/..
+CHANGED=$(git diff --name-only HEAD~1 | tr '\n' ' ')
+
+# Skip files that don't exist
+# (have been git rm'd)
+CHECK=""
+for FILE in $CHANGED; do
+    if [ -f "$FILE" ]; then
+        CHECK="$CHECK $FILE"
+    fi
+done
+
+diff -u --from-file /dev/null $CHECK | flake8 --diff
diff --git a/tox.ini b/tox.ini
index 69786c861c..d1f612a652 100644
--- a/tox.ini
+++ b/tox.ini
@@ -55,6 +55,10 @@ commands = python setup.py build_sphinx
 [testenv:cover]
 commands = {toxinidir}/tools/cover.sh {posargs}
 
+[testenv:fast8]
+commands =
+  {toxinidir}/tools/fast8.sh
+
 [testenv:pylint]
 deps = -r{toxinidir}/requirements.txt
        pylint==0.26.0