# pro-archman
# src/dir.sh
# Miscellaneous directory-related functions
#
# Copyright (C) 2013  Patrick McDermott
#
# This file is part of the ProteanOS Archive Manager.
#
# The ProteanOS Archive Manager 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 Archive Manager 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 Archive Manager.  If not, see
# <http://www.gnu.org/licenses/>.

hash_name()
{
	local name="${1}"
	shift 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/^\(src-.\).*$/\1/')"
	elif [ "x${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}"
	shift 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}"
	shift 1

	if ! _dir_is_empty "${dir}"; then
		return 1
	fi
	if ! rmdir -- "${dir}"; then
		return 1
	fi

	return 0
}