pre-commit hook for forbidding syntax error to be committed

pre-commit

#! /usr/bin/env bash

ruby_files=`git diff --name-only --diff-filter=MA --cached| grep '\.rb$'`

while read -r file; do
  result=`grep -rn 'binding\.pry\|debugger' $file`

  if [ -n "$result" ]
  then
    echo "Cannot be commited because: $result ."
    exit 1
  fi

  ruby_syntax=`ruby -c $file 2>&1`
  if [ $? -ne 0 ]
  then
    echo "Cannot be commited because ruby syntax error:"
    echo "$ruby_syntax"
    exit 1
  fi
done <<< "$ruby_files"

Put this in your .git/hooks directory and chmod u+x pre_commit