diff-flake8.sh

# Run flake8 only on new files according to git-diff
# 
# If run with no arguments, i.e.,
#     $ dflake8
# then the diff is taken against the master branch.
# If run with a single argument, then that argument is used for diff'ing, i.e.,
#     $ dflake8 feature-branch
# or
#     $ dflake8 HEAD
dflake8 () {
    if [ -n "$1" ]
    then
        commit=$1
    else
        commit=master
    fi
    echo Using \"$commit\" as base for \'diff\'
    git diff --name-only --diff-filter=AM $commit '***.py' \
        | xargs --no-run-if-empty -t flake8
}