gitpydiff

#!/usr/bin/bash
diffDir=/tmp/pydiff
fileList="$diffDir"/filelist
mkdir -p "$diffDir"

git status --porcelain -uno | egrep '^\sM\s.+$' >/dev/null
modification=$(git diff; git diff --cached)
if [ "$modification" != "" ]; then
	git status
	echo
	echo 'Error: Workspace or git index is not clean.' >&2
	exit 1
fi

commitHead="$1"
if [ "$commitHead" == "" ]; then
	commitHead=$(git log --pretty=format:%H -1 HEAD)
else
	commitHead=$(git log --pretty=format:%H -1 "$commitHead")
fi

git checkout -q "$commitHead"
git show --pretty=format:"" --numstat | awk '/(\.py|\.py.in)$/{print $3}' >"$fileList"
cat "$fileList" | xargs -I{F} /usr/bin/cp -f --parents {F} "$diffDir"
git checkout -q "$commitHead"~1

cat "$fileList" | while read filePath; do
	echo checking "$filePath"
	pydiff "$filePath" "$diffDir"/"$filePath"
done

git checkout -q "$commitHead"