pacdeps

#!/bin/bash

set -eu

readonly THIS_CMD="${0##*/}"
readonly VERSION='0.0.1'
readonly PACMANS=(
	"paru"
	"yay"
	"pacman"
)

function _help() {
	echo -e "
${THIS_CMD} -- Get a list of dependent packages

USAGE
    ${THIS_CMD} [OPTIONS] PKGNAMES...

OPTIONS
    -l --local             Search from installed packages
    -o --only-result       Print dependent package names only.
"
}

function _main() {
	if [ "$#" -le 0 ]; then
		_help
	fi

	_get_dependent_pkgs "${@}"
}

function _get_pacman_cmd() {
	local _cmd
	for _cmd in "${PACMANS[@]}"; do
		if command -v "${_cmd}" &>/dev/null; then
			echo -n "${_cmd}"
			return 0
		fi
	done
	_err 'The command for pacman or AUR helper was not found.'
	exit 1
}

function _get_dependent_pkgs() {
	local pacman_cmd
	pacman_cmd="$(_get_pacman_cmd)"

	for pkg_name in "${@}"; do

		echo "${pkg_name}"

		LANG=C "${pacman_cmd}" --sync --info "${pkg_name}" |
			awk -F '[:<=>]' '/^Depends/ {print $2}' |
			xargs -n1 |
			sort |
			sed 's/^/\t/'
	done
}

_main "${@}"
exit "${?}"