# pro-archman
# lib/dir.sh
# Miscellaneous directory-related functions
#
# Copyright (C) 2013  Patrick "P. J." McDermott
#
# This program 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.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

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

hash_name()
{
	local name="${1}"
	local hash=

	if [ "x${name}" != "x${name#lib?}" ]; then
		hash="$(printf '%s\n' "${name}" | sed 's/^\(lib.\).*$/\1/')"
	elif [ "x${name}" != "x${name#src-?}" ]; then
		hash="$(printf '%s\n' "${name}" | sed 's/^\(src-.\).*$/\1/')"
	else
		hash="$(printf '%s\n' "${name}" | sed 's/^\(.\).*$/\1/')"
	fi
	printf '%s\n' "${hash}"

	return 0
}

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}
}

try_rmdir()
{
	local dir="${1}"

	if dir_is_empty "${dir}"; then
		rmdir "${dir}"
		return ${?}
	else
		return 1
	fi
}