git util to isort all files with a diff

git-isort

#!/bin/bash

#
# git isort - isort files with a diff
#
# to use:
# * install isort (this code uses pyenv and has isort installed in 2.7.5)
# * place this file anywhere on PATH, callable via `git isort`
#

isort_cmd=$(pyenv root)/versions/2.7.5/bin/isort
$isort_cmd --version >/dev/null 2>&1

if [ $? != 0 ]
then
  echo "isort is broken"
  exit
fi

for f in $(git diff head --name-only)
do
    echo "isort $f"
    $isort_cmd "$f"
done