My "rewrite" of u/brunomiguel's bootstrap script

bootstrap.sh

#!/bin/env bash
# 
# bootstrap.sh
# Author:       u/stewie410
# Date:         2019-10-18
#
# Rewrite for u/brunomiguel
#       https://www.reddit.com/r/bash/comments/djcop0/asking_feedback_on_a_bootstrap_script

# ##----------------------------##
# #|            Traps           |#
# ##----------------------------##
# Always run usv() function when exiting
trap usv EXIT

# ##------------------------------------##
# #|            Functions               |#
# ##------------------------------------##
# Cleanup
usv() { unset _path_file_pacman _pkg_groups _url_repo_user; }

# Ask user a Yes/No Question, default to Yes -- Args: $1: Prompt
askUser() {
    # Prompt user for input
    local _ans; read -p "${1}? (Y/n): " _ans

    # If the answer, in lowercae, matches "n" or "no", return false; otherwise return true
    if [[ "${_ans,,}" =~ ^no? ]]; then return 1; else return 0; fi
}

# Add User Repository
addUserRepo() {
    # Ask user to add user repository
    if ! askUser "Continue adding User Repository"; then return 1; fi

    # Add User Repository to pacman configuration
    sudo tee -a "${_path_file_pacman}" <(printf '%s\n' "[userrepository]" "Server = ${_url_repo_user}" "SigLevel = Optional TrustAll")
}

# Install requested groups
groupInstall() {
    # Ask user to install package groups
    if ! askUser "Continue adding requested groups"; then return 0; fi

    # Install package groups
    sudo pacman -Syuv "${_pkg_groups[@]}"
}

# Build Meta Package
buildMeta() {
    # Ask user to build metapackage
    if ! askUser "Continue building metapackage"; then return 0; fi

    # Build Metapackage
    makepkg -Ccdfi
}

# ##------------------------------------##
# #|            Variables               |#
# ##------------------------------------##
# Paths -- Files
_path_file_pacman="/etc/pacman.conf"

# Packages to install
_pkg_groups=("base-devel")

# URLs
_url_repo_user="https://userrepository.eu"

# ##----------------------------##
# #|            Run             |#
# ##----------------------------##
# Add user repository
if ! addUserRepo; then exit 1; fi

# Refresh Mirrors && Install updates
sudo pacman -Syyuv --noconfirm

# Install requested groups
if ! groupInstall; then exit 1; fi

# Build metapackage
if ! buildMeta; then exit 1; fi

# Finish
exit 0