check-pre-commit

#!/bin/bash

# This script is designed for use in a GitHub Actions CI environment to verify that files changed in a
# pull request or push adhere to the project's coding standards. It checks for trailing whitespaces,
# ensures tabs are replaced by spaces, and validates C/C++ files with clang-format.
# If any issues are found, it will fail the CI job, preventing merges with style violations.

set -ex
set -o pipefail

if [[ "$GITHUB_BASE_REF" != "" ]]; then
    # In a PR
    git fetch origin $GITHUB_BASE_REF
    base=$GITHUB_BASE_REF
else
    base=main
    git fetch origin main
fi

files=$(git diff --name-only origin/$base...HEAD | grep -E '.*\.(sh|s|S|asm|ld|txt|cmake|clang-format|c|h|hpp|cpp|cppm)$' || true)

exit_code=0

for file in $files; do
    # trailing white space
    diff -u <(cat $1) <(sed -E 's/[ '$'\t'']+$//g' $1) > /dev/null 2>&1
    if [[ $? -ne 0 ]]; then
        echo "::error file=$file::trailing whitespace detected"
        exit_code=1
    fi

    # trailing white space
    diff -u <(cat $1) <(sed -E 's/\t/    /g' $1) > /dev/null 2>&1
    if [[ $? -ne 0 ]]; then
        echo "::error file=$file::tab character detected"
        exit_code=1
    fi

    # clang-format for C/C++ source files
    if [[ "$file" =~ \.(h|c|hpp|cpp|cppm)$ ]]; then
        if ! clang-format --dry-run --Werror "$file"; then
            echo "::error file=$file::clang-format style violation"
            exit_code=1
        fi
    fi
done

exit $exit_code