git pre-commit hook that checks forgotten print’s and pyflakes errors

pre-commit

#!/bin/bash

cd ./$(git rev-parse --show-cdup)
result=$(mktemp /tmp/pre-commit.XXXXX)
STAGED=${STAGED:---staged}
changed_py=$(git diff --name-only --diff-filter=AM $STAGED | grep -E '\.py$')
changed_js=$(git diff --name-only --diff-filter=AM $STAGED | grep -E '\.js$')

[[ -z $changed ]] && exit 0

if pip freeze -r requirements.txt 2>&- >&-
then
    status=1
    [[ -z extra_new_line  ]] || { echo; echo; }
    echo You have errors in requirements.txt
    echo
    extra_new_line=yes
fi

if grep -HEn '^\s* print' $changed_py > $result
then
    status=1
    [[ -z extra_new_line  ]] || { echo; echo; }
    echo You have some print’s in your python files
    echo
    extra_new_line=yes
    cat $result
fi

if grep -HEn '^\s*console.log' $changed_py > $result
then
    status=1
    [[ -z extra_new_line  ]] || { echo; echo; }
    echo You have some console.log in you JS files
    echo
    extra_new_line=yes
    cat $result
fi

if grep -HEn $USER $changed_py > $result
then
    status=1
    [[ -z extra_new_line  ]] || { echo; echo; }
    echo You have some mentions about your username in files
    echo
    extra_new_line=yes
    cat $result
fi

if ! pyflakes $changed_py > $result
then
    status=1
    [[ -z extra_new_line  ]] || { echo; echo; }
    echo pyflakes says you have some errors
    echo
    cat $result
fi

rm -f $result
exit $status