pre-commit

#!/bin/bash
#
# Check that we're not adding any .orig files, and check for trailing
# whitespace.
#

if git rev-parse --verify HEAD >/dev/null 2>&1
then
  against=HEAD
else
  # Initial commit: diff against an empty tree object
  against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

# Check for .orig files added in this commit.
orig_files=$(git diff --cached --name-only --diff-filter=A $against | grep '\.orig$')
if [[ "$orig_files" != "" ]]; then
  num_orig_files=$(echo "$orig_files" | wc -l)
  if [[ "$num_orig_files" == "1" ]]; then
    echo "Error: Attempting to commit .orig file $orig_files."
  else
    echo "Error: Attempting to commit $num_orig_files .orig files:"
    echo
    echo "$(echo "$orig_files" | sed -e 's/^/  /')"
  fi
  echo
  echo "If you really want to proceed, commit with --no-verify."
  exit 1
fi

# Check for trailing whitespace
if ! git diff-index --check --cached $against --; then
  echo
  echo "Error: Trailing whitespace in commit."
  echo
  echo "Try git rebase --whitespace=fix, or, if you really want to proceed,"
  echo "commit with --no-verify."
  exit 2
fi