Run fake8 on lines changed in current branch

git-flake8

#! /bin/bash
# https://gist.github.com/millerdev/e25014e4b886a5c619419d56b778a423
#
# Usage: git flake8 [refname] [flake8 options]
if [ "${1:0:1}" = "-" ]; then
    BRANCH=origin/master
else
    BRANCH=${1:-origin/master}
    shift
fi
CURRENT=$(git rev-parse --abbrev-ref HEAD)
echo "$BRANCH...$CURRENT"
git diff $BRANCH...$CURRENT | flake8 --diff "$@" 1>&2

Copy this script to a directory in $PATH and make the file executable (chmod +x git-flake8). flake8 must be installed and accessible via $PATH as well (a virtualenv is a great place to put that).

Thanks Daniel!