pre-commit

#!/bin/sh

STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep -iE '\.(cpp|h|c|hpp)$')

if [ -z "$STAGED_FILES" ]; then
  exit 0
fi

NEEDS_FORMATTING=0

# Run clang-format on the changed lines of each staged file
for FILE in $STAGED_FILES; do
  # Get the changed lines in the file
  CHANGED_LINES=$(git diff --cached -U0 -- $FILE | grep -E '^@@' | awk '{print $3}' | cut -d',' -f1)

  # Format each changed line in the file
  for LINE in $CHANGED_LINES; do
    LINE_START=$(echo $LINE | cut -d'+' -f2)
    if [ -z "$LINE_START" ]; then
      continue
    fi
    clang-format -i --lines=$LINE_START:$LINE_START $FILE
  done

  if ! git diff --quiet $FILE; then
    NEEDS_FORMATTING=1
    echo $FILE
  fi
done

if [ $NEEDS_FORMATTING -eq 1 ]; then
  echo "The above files were formatted. Please review and stage the changes before committing."
  exit 1
fi

exit 0