Pacman helper for AUR linux installing

paclinux-install.sh

#!/usr/bin/zsh
set -e
set -o pipefail
if [ $# -lt 1 ]; then
	echo 'Usage: paclinux-install.sh VERSION' >&2
	exit 1
fi

function print_pkg_files() {
	echo -e '\033[1;36mpackage files:\033[0m'
	while [ $# -gt 0 ]; do
		printf "\t%s\n" "$1"
		shift
	done
}

function log_color() {
	if [ $# -lt 1 ]; then
		echo 'Usage: log_color LEVEL' >&2
		return 1
	fi
	case "$1" in
		"warn")
			echo -ne '\033[1;33m'
			;;
		"error")
			echo -ne '\033[0;31m'
			;;
		"debug")
			echo -ne '\033[0;34m'
			;;
		"info")
			echo -ne '\033[1m'
			;;
		*)
			;;
	esac
}

function log_level_prefix() {
	if [ $# -lt 1 ]; then
		echo 'Usage: log_level_prefix LEVEL' >&2
		return 1
	fi
	case "$1" in
		"warn")
			echo -n 'WARNING'
			;;
		"error")
			echo -n 'ERROR'
			;;
		"info")
			echo -n 'INFO'
			;;
		"debug")
			echo -n 'DEBUG'
			;;
		*)
			echo -n "$1"
			;;
	esac
}

function do_log() {
	if [ $# -lt 2 ]; then
		echo 'Usage: log LEVEL [MESSAGE...]' >&2
		return 1
	fi
	local log_level="$1"
	shift
	if [ $# -gt 0 ]; then
		echo -e "[$(log_color "$log_level")$(log_level_prefix "$log_level")\033[0m]: $@"
	fi
}

function log_warn() {
	do_log warn "$@"
}

function log_error() {
	do_log error "$@"
}

function log_info() {
	do_log info "$@"
}

function log_debug() {
	local debug_enabled=${DEBUG:-0}
	if [ $debug_enabled -eq 0 ]; then
		return 0
	fi
	do_log debug "$@"
}

while getopts ":dC:" opt; do
	case ${opt} in
		d)
			dry_run=1
			;;
		C)
			log_info "Changing directory to: \"$OPTARG\""
			cd "$OPTARG"
			;;
		\?)
			log_error "Unknown argument: -$OPTARG" >&2
			exit 1
			;;
		:)
			log_error "Invalid argument: -$OPTARG requires an argument" >&2
			exit 1
			;;
	esac
done
shift $((OPTIND -1))

dry_run=${dry_run:-0}

pkg_files=(*$1*.tar.zst)
print_pkg_files ${pkg_files[@]}

if [ ${#pkg_files[@]} -le 0 ]; then
	log_error "pkg_files was empty!" >&2
	exit 1
fi

if [ ${#pkg_files[@]} -lt 3 ]; then
	log_warn "pkg_files contained less than ${#pkg_files[@]} files (expected: 3): ${pkg_files[@]}" >&2
fi

if [ $dry_run -eq 0 ]; then
	if [ "$(whoami)" != "root" ]; then
		sudo pacman -U ${pkg_files[@]}
	else
		pacman -U ${pkg_files[@]}
	fi
	log_debug "Installed $1 from ${pkg_files[@]}"
else
	log_info "Dry run: \"pacman -U ${pkg_files[@]}\""
fi