#!/usr/bin/env bash

# Copyright (c) eBPF for Windows contributors
# SPDX-License-Identifier: MIT

set -o errexit

exit_() {
    echo ""
    echo "$1"
    echo ""
    echo "This hook can be skipped if needed with 'git commit --no-verify'"
    echo "See '.git/hooks/pre-commit', installed from 'scripts/pre-commit'"
    exit 1
}

if [[ $(git config --get user.name | wc -w) -lt 2 ]]; then
    # This heuristic avoids bad user names such as "root" or "Ubuntu"
    # or a computer login name. A full name should (usually) have at
    # least two words. We can change this if needed later.
    exit_ "Commit failed: please fix your Git user name (see docs/Contributing.md)"
fi

if ! git diff-index --check --cached HEAD --; then
    exit_ "Commit failed: please fix the conflict markers or whitespace errors"
fi

mapfile -t files < <(git diff --cached --name-only --diff-filter=ACMR)

if [[ ${#files[@]} -eq 0 ]]; then
    # When 'git commit --amend' is used, the files list is empty. The
    # scripts below interpret an empty file set as a directive to
    # check all the files, which is slow (but used in CI). So in this
    # Git hook, we just skip the following checks instead.
    exit 0
fi

scripts=$(git rev-parse --show-toplevel)/scripts

if ! "$scripts/format-code" --quiet --whatif --files="${files[*]}"; then
    exit_ "Commit failed: to fix the formatting please run './scripts/format-code --staged' in bash or '.\\scripts\\format-code.ps1 --staged' in powershell"
fi
if ! "$scripts/check-license.sh" "${files[@]}"; then
    exit_ "Commit failed: please add license headers to the above files"
fi