Git pre-commit hook to run clang-format and linters from bitcoin

pre-commit.sh

#!/bin/sh

script_dir="contrib/devtools"
files_to_commit=$(git diff-index --cached --name-only --diff-filter=d HEAD)

format_paths="src/esperanza src/snapshot"
for file in ${files_to_commit}
do
    for path in $format_paths
    do
        if [[ "${file}" =~ $path ]] ;then
            echo $path
            clang-format -i ${file} -style=file && git add ${file}
        fi
    done
done

# check for empty commits after reformat and prevent them
files_to_commit=$(git diff-index --cached --name-only --diff-filter=d HEAD)

if [ -z ${files_to_commit} ] ;then
    echo "Nothing to commit after reformat!"
    exit 1
fi

# run lint checkers
lint_command="${script_dir}/check-doc.py && \
${script_dir}/check-rpc-mappings.py . && \
${script_dir}/lint-all.sh"

eval ${lint_command}