git-pre-commit

#!/usr/bin/env bash

# This script is being invoked via <root dir>/.git/hooks, hence the
# base directory is up two levels, not just one.
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd ../.. && pwd )"

cd "$DIR"

# Make sure we can use git correctly
git rev-parse --verify HEAD >/dev/null 2>&1
if [ $? -ne 0 ]; then
  echo "Unable to determine revision of this git repo"
  exit 1
fi

# Check whitespace problems
git diff-index --check --cached HEAD --
if [ $? -ne 0 ]; then
  echo 'Please address these whitespace issues and then try committing again'
  exit 1
fi

# Run rubocop on any ruby files that have been changed or added

TMPFILE=$(mktemp /tmp/rubocop-list.XXXXX)
function cleanup() {
  rm -f "$TMPFILE"
}
trap cleanup exit

pattern='^(lib|rake|spec/octocatalog-diff/integration|spec/octocatalog-diff/tests)/.*\.rb$'
antipattern='^(lib/octocatalog-diff/external/|spec/octocatalog-diff/tests/external/)'
cd "$DIR" && git diff-index --diff-filter=AM --name-only --cached HEAD | egrep "$pattern" | egrep -v "$antipattern" > "$TMPFILE"
if [ -s "$TMPFILE" ]; then
  files=$( cat "$TMPFILE" | tr "\n" " " )
  "$DIR/script/fmt" ${files}
  if [ $? -ne 0 ]; then
    echo 'Please address these style or syntax issues and then try committing again'
    exit 1
  fi
fi
exit 0