#!/usr/bin/env bash

# To use:
# ln -s scripts/clang-format.hook .git/hooks/pre-commit

# Based loosely on https://github.com/andrewseidl/githook-clang-format

format_file() {
    file="${1}"
    case "$file" in
    *.hpp | *.cpp | .c | *.cc | *.cu | *.h )
        if [ -f "${1}" ] ; then
            clang-format -i -style=file -sort-includes "${1}"
            if git diff-files --quiet -- "${1}" ; then
                echo "Already nicely formatted: ${1}"
            else
                git add "${1}"
                echo "Reformatting file: ${1}"
            fi
        fi
        ;;
    *)
        ;;
    esac
}

case "${1}" in
  --about )
    echo "Runs clang-format on source files"
    ;;
  * )
    for file in `git diff-index --cached --name-only HEAD` ; do
      format_file "${file}"
    done
    ;;
esac