# Miscellaneous directory-related functions
#
# Copyright (C) 2013  Patrick "P. J." McDermott
#
# This file is part of the ProteanOS Development Kit.
#
# The ProteanOS Development Kit is free software: you can redistribute
# it and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# The ProteanOS Development Kit is distributed in the hope that it
# will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the ProteanOS Development Kit.  If not, see
# <http://www.gnu.org/licenses/>.

[ "x${_DIR_SM+set}" = 'xset' ] && return 0
_DIR_SM=1

dir_is_empty()
{
	local dir="${1}"
	local ret=
	local dirent=

	ret=0

	# Patterns to match all dirents except "." and "..":
	#   *      dirents whose names don't start with "."
	#   .[!.]  dirents whose names start with ".", are two characters long,
	#          and aren't ".."
	#   .??*   dirents whose names start with "." and are three or more
	#          characters long
	for dirent in "${dir}/"* "${dir}/".[!.] "${dir}/".[!.] "${dir}/".??*; do
		if [ -e "${dirent}" ]; then
			ret=1
			break
		fi
	done

	return ${ret}
}