Run JSHint validation before commit

pre-commit

#!/bin/bash
#
# Run JSHint validation before commit.
files=$(git diff --cached --name-only --diff-filter=ACM | grep '.js$')
pass=true

# JSHint
if [ "$files" != "" ]; then
  for file in ${files}; do
    jshint ${file}
    if [[ $? -ne 0 ]]; then
      pass=false
    fi
  done
fi

if $pass; then
  exit 0
else
  echo ""
  echo "COMMIT FAILED:"
  echo "Some JavaScript files are invalid. Please fix errors and try committing again."
  exit 1
fi