.githooks/pre-commit

#!/bin/sh

here=${0%/*}

CHIP_ROOT=$(cd "$here/.." && pwd)

SAVED_UNSTAGED=0
SAVED_UNSTAGED_FILE=$(git rev-parse --short HEAD)-unstaged.diff

RESTYLED=0

save_unstaged() {
    if [[ $SAVED_UNSTAGED -ne 0 ]]; then
        git diff --output="$SAVED_UNSTAGED_FILE"
        git apply -R "$SAVED_UNSTAGED_FILE"
    fi
}

revert_unstaged() {
    if [[ $SAVED_UNSTAGED -ne 0 ]]; then
        git apply "$SAVED_UNSTAGED_FILE"
        rm "$SAVED_UNSTAGED_FILE"
    fi
    SAVED_UNSTAGED=0
}

revert_restyled() {
    if [[ $RESTYLED -ne 0 ]]; then
        # Reset the changes introduced by restyle
        git stash push -q --keep-index
        git stash drop -q
    fi
    RESTYLED=0
}

revert_if_needed() {
    revert_restyled
    revert_unstaged
}

trap "revert_if_needed; exit 1" SIGINT SIGTERM SIGKILL

git diff --quiet
SAVED_UNSTAGED=$?

# If there are unstaged files, save them for now
save_unstaged

# Try restyling the code
"$CHIP_ROOT"/scripts/helpers/restyle-diff.sh

git diff --quiet
RESTYLED=$?
FAILED_COMMIT="$RESTYLED"

revert_if_needed

if [[ $FAILED_COMMIT -ne 0 ]]; then
    echo "Commit Failed: Code needs restyling before committing."
    echo "Restyling can be done by running $CHIP_ROOT/scripts/helpers/restyle-diff.sh"
    exit 1
fi

echo "Code doesn't need restyling. Committing."