Does some simple go/ruby linting to add to your .git/hooks/pre-commit file

pre-commit.sh

#!/bin/bash

function go_golangci_lint() {
    echo "Running golangci-lint..."
    local -r files="${1}"
    # shellcheck disable=SC2086
    golangci-lint run \
      --no-config \
      --presets bugs,format,style,unused \
      --out-format=tab \
      -D goimports \
      -D lll \
      -D megacheck \
      -D gofmt \
      -D golint \
      -D typecheck \
      $files
}

function go_goimports() {
    echo "Fixing formatting with goimports..."
    local -r files="${1}"
    # shellcheck disable=SC2086
    goimports -w $files && git add $files
}

function ruby_rubocop() {
    echo "Autocorrecting ruby files..."
    local -r files="${1}"
    # shellcheck disable=SC2086
    bundle exec rubocop --force-exclusion -a $files && git add $files
}

function check_requirements() {
    local -r golangci_lint_version="1.11.2"

    if ! command -v golangci-lint > /dev/null; then
        2> echo "ERROR: please 'brew install golangci/tap/golangci-lint'"
        return 1
    fi

    if ! golangci-lint --version | grep -q "$golangci_lint_version"; then
        echo "WARNING: golangci-lint is out-of-date, please run 'brew upgrade golangci/tap/golangci-lint'"
        return 1
    fi
}

function ask_to_continue() {
    exec < /dev/tty
    read -rp "Errors happen. Do you want to ignore them and commit anyway? (y/N) " yn
    case $yn in
        [Yy] ) return 0;;
        * ) return 1;;
    esac
}

function lint() {
    local -r files="$(git diff --diff-filter=ACMRTUXB --cached HEAD --name-only)"
    local -r go_files="$(echo "$files" | grep -E '[.]go$' | xargs)"
    local -r ruby_files="$(echo "$files" | grep -E '[.]rb$' | xargs)"
    local -i errors=0
    if [ "${files}" = "" ]; then
        exit 0
    fi
    if ! check_requirements 1> /dev/null; then
        echo "Must have golangci-lint, goimports installed"
        exit 1
    fi
    if [ "${go_files}" != "" ]; then
        if ! go_goimports "${go_files}"; then
            errors+=1
        fi
        if ! go_golangci_lint "${go_files}"; then
            errors+=1
        fi
    fi
    if [ "${ruby_files}" != "" ]; then
        if ! ruby_rubocop "${ruby_files}"; then
            errors+=1
        fi
    fi
    
    return $errors
}

if ! lint; then
    ask_to_continue
fi

exit $?