Pre-commit-hook that runs static analysis on staged python and js files. On errors, each error is printed and the commit is aborted .

pre-commit

#!/bin/sh

echo '### Commit if static analysis pass'
IFS=$'\n'
staged_files=($(git diff --staged --name-only --no-color))
if [ ${#staged_files[@]} -eq 0 ]; then
    echo "### No staged files, exiting"
	exit 1
else
    echo '### Running static analysis on staged files'
fi

python_files=()
js_files=()

for i in "${staged_files[@]}"
do	
	if [[ $i =~ \.py$ ]]; then
		python_files+=($i)
	fi
	if [[ $i =~ \.js$ ]]; then
		js_files+=($i)
	fi
done

pass=true

echo '### Running static analysis for Python files'
for i in "${python_files[@]}"
do
    result=$(env/bin/flake8 ${i})
    if [ "$result" != "" ]; then
      echo "$result"
      pass=false
    fi
done

echo '### Running static analysis for JS files'
npm list -g jshint > /dev/null
if [ $? -eq 0 ]
then
	for i in "${js_files[@]}"
	do
	    result=$(jshint ${i})
	    if [ "$result" != "" ]; then
	      echo "$result"
	      pass=false
	    fi
	done
else
  echo '### jshint is not installed, skipping js linting. install with npm install -g jshint'
fi


if ! $pass; then
  echo '### Staged file(s) had linting errors, fix before committing or use flag --no-verify' 
  exit 1
else
  echo '### Passed\n'
  exit 0
fi